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Fluorescence spectroscopic studies of the effect of granular activated carbon adsorption on structural

Shuang XUE, Qingliang ZHAO, Liangliang WEI, Xiujuan HUI, Xiping MA, Yingzi LIN

《环境科学与工程前沿（英文）》 2012年 第6卷 第6期   页码 784-796 doi: 10.1007/s11783-012-0436-5

摘要： This work investigated the effect of granular activated carbon adsorption (GACA) on fluorescence characteristics of dissolved organic matter (DOM) in secondary effluent, by means of excitation–emission matrix (EEM) spectra, the fluorescence regional integration (FRI) method, synchronous spectra, the fluorescence index defined as the ratio of fluorescence emission intensity at wavelength 450 nm to that at 500 nm at excitation ( )=370 nm, and the wavelength that corresponds to the position of the normalized emission band at its half intensity ( ). DOM in the secondary effluent from the North Wastewater Treatment Plant (Shenyang, China) was fractionated using XAD resins into 5 fractions: hydrophobic acid (HPO–A), hydrophobic neutral (HPO–N), transphilic acid (TPI–A), transphilic neutral (TPI–N) and hydrophilic fraction (HPI). Results showed that fluorescent materials in HPO–N and TPI–N were less readily removed than those in the other fractions by GACA. The relative content of fluorescent materials in HPO–A, TPI–A and HPI decreased whereas that in HPO–N and TPI–N increased as a consequence of GACA. Polycyclic aromatics in all DOM fractions were preferentially absorbed by GACA, in comparison with bulk DOM expressed as DOC. On the other hand, the adsorption of aromatic amino acids and humic acid-like fluorophores exhibiting fluorescence peaks in synchronous spectra by GACA seemed to be dependent on the acid/neutral properties of DOM fractions. All five fractions had decreased fluorescence indices as a result of GACA. GACA led to a decreased value for HPO–A, increased values for HPO–N, TPI–A and HPI, and a consistent value for TPI–N.

关键词： granular activated carbon adsorption     dissolved organic matter     fractionation     fluorescence    

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Influence of pore structure on biologically activated carbon performance and biofilm microbial characteristics

《环境科学与工程前沿（英文）》 2021年 第15卷 第6期 doi: 10.1007/s11783-021-1419-1

摘要：

• Pore structure affects biologically activated carbon performance.

关键词： Granular activated carbon     Biologically activated carbon filter     Bacterial community structure     Pore structure    

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Adsorption of benzene and toluene from waste gas using activated carbon activated by ZnCl

Leila KARIMNEZHAD,Mohammad HAGHIGHI,Esmaeil FATEHIFAR

《环境科学与工程前沿（英文）》 2014年 第8卷 第6期   页码 835-844 doi: 10.1007/s11783-014-0695-4

摘要： A series of activated carbons with high surface area were prepared from walnut shell using chemical activation with ZnCl . In this research the carbonization stage was carried out at 500°C. The performance of the synthesized carbons evaluated in adsorption of benzene and toluene from waste gas. The influence of impregnation ratio on the characteristics of synthesized activated carbons as well as their adsorption capacity was investigated. The ratio of activation agent to walnut shell was selected in the range of 0.5–2.0 wt/wt. The synthesized activated carbons were characterized using XRD, SEM, BET and FTIR techniques. The highest activated carbon production yield was obtained at impregnation ratio of 1.5 wt/wt. The XRD analysis illustrated that peaks intensity decreased with increasing impregnation ratio showing that amorphous property of samples was increased. The SEM analysis revealed successful pore development in synthesized activated carbons obtained at high impregnation ratios. The surface area of the activated carbons increased with increasing impregnation ratio and its maximum value reached 2643 m ?g at impregnation ratio of 2/1. FTIR analysis indicated that the relative amount of different acidic surface groups on synthesized carbons was a function of impregnation ratio. Experimental results for benzene and toluene adsorption showed a high potential of employing synthesized impregnated activated carbon for treatment of waste gas. Generally, the amount of VOC adsorbed on the surface was affected by physicochemical properties of synthesized activated carbons.

关键词： Chemical activation     activated carbon     textural characterization     adsorption     benzene     toluene    

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Kinetics and thermodynamics of the phosphine adsorption on the modified activated carbon

Bingnan REN

《化学科学与工程前沿（英文）》 2011年 第5卷 第2期   页码 203-208 doi: 10.1007/s11705-010-0571-0

摘要： The kinetics and the thermodynamics of phosphine (PH ) adsorption on the modified activated carbon have been explained for the adsorption process of PH . This study investigated the kinetic and thermodynamic properties of PH adsorption on the activated carbon impregnated with 5% HCl solution. The thermodynamic properties including PH adsorption isotherm and adsorption heat were separately investigated at 20°C, 70°C, 90°C. The results showed that the Freundlich-type isotherm equation described the isotherms well. The adsorption capacity increased with increasing temperature between 20°C and 70°C. Between 70°C and 90°C, the adsorption capacity decreased obviously with increasing temperature. The adsorption capacity reached the maximum at 70°C. By analyzing the results of the kinetics and the thermodynamics, we found that the adsorption of PH was dominated by physical adsorption at the lower temperature (20°C). Then with increasing temperature, chemical adsorption gradually dominated in the adsorption process. The adsorption capacity decreased at above 70°C is due to the exothermic effects in the process of adsorption.

关键词： adsorption     PH3     activated carbon     kinetics     thermodynamics    

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The influence of chlorinated aromatics' structure on their adsorption characteristics on activated carbon

Pengfei LIN,Yuan ZHANG,Xiaojian ZHANG,Chao CHEN,Yuefeng XIE,Irwin H SUFFET

《环境科学与工程前沿（英文）》 2015年 第9卷 第1期   页码 138-146 doi: 10.1007/s11783-014-0725-2

摘要： This study focused on evaluating the efficiency of powdered activated carbon (PAC) adsorption process and tackling chlorobenzenes and chlorophenols spill in drinking water source. The adsorption kinetics and PAC’s capacities for five chlorobenzenes and three chlorophenols at drinking water contamination levels were studied in order to determine the influence of different functional groups on the adsorption behavior. The results showed that PAC adsorption could be used as an effective emergency drinking water treatment process to remove these compounds. The adsorption kinetics took 30 min to achieve nearly equilibrium and could be described by both pseudo first-order and pseudo second-order models. A mathematic relationship was developed between the pseudo first-order adsorption rate constant, k , and the solutes’ properties including lg , polarizability and molecular weight. The Freundlich isotherm equation could well describe the adsorption equilibrium behaviors of chlorinated aromatics with from 0.920 to 0.999. The H-bond donor/acceptor group, hydrophobicity, solubility and molecular volume were identified as important solute properties that affect the PAC adsorption capacity. These results could assist water professionals in removing chlorinated aromatics during emergency drinking water treatment.

关键词： chlorinated aromatics     adsorption     powdered activated carbon     kinetics     equilibrium    

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Preparation and adsorption performances of mesopore-enriched bamboo activated carbon

WANG Yuxin, LIU Congmin, ZHOU Yaping

《化学科学与工程前沿（英文）》 2008年 第2卷 第4期   页码 473-477 doi: 10.1007/s11705-008-0081-5

摘要： Activated carbon with high specific surface area and considerable mesopores was prepared from bamboo scraps by phosphoric acid activation. The effect of activation conditions was studied. Under the conditions of impregnating bamboo with 80% HPO at 80°C for 9 days and activation at 500°C for 4 h, the prepared activated carbon had the highest mesopore volume of 0.67 cm/g, a specific surface area of 1567 m/g, and the mesopore ratio reached 47.18%. The study on adsorption isotherms of CH, CO, N and O on the activated carbon were carried out at 298 K. The considerable difference in the adsorption capacity between CO and the other gases was observed, which would be of interest for the adsorptive separation/purification of gaseous CO from its mixtures, especially from mixtures with N and/or O.

关键词： mesopore volume     gaseous     considerable difference     adsorption capacity     activation    

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Removal of phenol by powdered activated carbon adsorption

Yan MA, Naiyun GAO, Wenhai CHU, Cong LI

《环境科学与工程前沿（英文）》 2013年 第7卷 第2期   页码 158-165 doi: 10.1007/s11783-012-0479-7

摘要： In this study, the adsorption performance of powdered activated carbon (PAC) on phenol was investigated in aqueous solutions. Batch adsorption studies were performed to evaluate the effects of various experimental parameters like PAC type, PAC dose, initial solution pH, temperature and pre-oxidation on the adsorption of phenol by PAC and establish the adsorption kinetics, thermodynamics and isothermal models. The results indicated that PAC adsorption is an effective method to remove phenol from water, and the effects of all the five factors on adsorption of phenol were significant. The adsorption rate of phenol by PAC was rapid, and more than 80% phenol could be absorbed by PAC within the initial 10 min. The adsorption process can be well described by pseudo-second-order adsorption kinetic model with rate constant amounted to 0.0313, 0.0305 and 0.0241 mg·μg ·min with coal, coconut shell and bamboo charcoal. The equilibrium data of phenol absorbed onto PAC were analyzed by Langmuir, Freundlich and Tempkin adsorption isotherms and Freundlich adsorption isotherm model gave the best correlation with the experimental data. Thermodynamic parameters such as the standard Gibbs free energy (? ), enthalpy (? ) and entropy (? ) obtained in this study indicated that the adsorption of phenol by PAC is spontaneous, exothermic and entropy decreasing.

关键词： phenol     powdered activated carbon     adsorption     kinetics     isotherms    

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Kinetics of enhanced adsorption by polarization for organic pollutants on activated carbon fiber

HAN Yanhe, QUAN Xie, ZHAO Huimin, CHEN Shuo, ZHAO Yazhi

《环境科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 83-88 doi: 10.1007/s11783-007-0016-2

摘要： The adsorption kinetics for model pollutants on activated carbon fiber (ACF) by polarization was investigated in this work. Kinetics data obtained for the adsorption of these model pollutants at open-circuit, 400 mV, and -400 mV polarization were applied to the Lagergren equation, and adsorption rate constants () were determined. With the anodic polarization of 400 mV, the capacity of sodium phenoxide was increased from 0.0083 mmol/g at open-circuit to 0.18 mmol/g, and a 17-fold enhancement was achieved; however, the capacity of -nitrophenol was decreased from 2.93 mmol/g at open-circuit to 2.65 mmol/g. With the cathodal polarization of -400 mV, the capacity of aniline was improved from 3.60 mmol/g at open-circuit to 3.88 mmol/g; however, the capacity of sodium dodecylbenzene sulfonate was reduced from 2.20 mmol/g at open-circuit to 1.59 mmol/g. The enhancement for electrosorption changed with dif ferent groups substituting. Anodic polarization enhances the adsorption of benzene with the electron-donating group. But whether anodic or not, cathodal polarization had less effect on the adsorption of electron-accepting aromatic compounds, and decreased the adsorption capacity of benzene-bearing donor-conjugate bridge-acceptor, while increasing its adsorption rate. Electrostatic interaction played a very important role in the electrosorption of ion-pollutants.

关键词： ACF     activated     17-fold enhancement     donor-conjugate bridge-acceptor     Electrostatic interaction    

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Significant enhancement in catalytic ozonationefficacy: From granular to super-fine powdered activatedcarbon

Tianyi Chen, Wancong Gu, Gen Li, Qiuying Wang, Peng Liang, Xiaoyuan Zhang, Xia Huang

《环境科学与工程前沿（英文）》 2018年 第12卷 第1期 doi: 10.1007/s11783-018-1022-2

摘要： In this study, super-fine powdered activated carbon (SPAC) hasbeen proposed and investigated as a novel catalyst for the catalyticozonation of oxalate for the first time. SPAC was prepared from commercialgranular activated carbon (GAC) by ball milling. SPAC exhibited highexternal surface area with a far greater member of meso- and macropores(563% increase in volume). The catalytic performances of activatedcarbons (ACs) of 8 sizes were compared and the rate constant for pseudofirst-order total organic carbon removal increased from 0.012 min to 0.568 min (47-fold increase) withthe decrease in size of AC from 20 to 40 mesh (863 mm) to SPAC (~1.0 mm). Furthermore, the diffusion resistance of SPAC decreased17-fold compared with GAC. The ratio of oxalate degradation by surfacereaction increased by 57%. The rate of transformationof ozone to radicals by SPAC was 330 times that of GAC. The resultssuggest that a series of changes stimulated by ball milling, includinga larger ratio of external surface area, less diffusion resistance,significant surface reaction and potential oxidized surface all contributedto enhancing catalytic ozonation performance. This study demonstratedthat SPAC is a simple and effective catalyst for enhancing catalyticozonation efficacy.

关键词： Super-fine activated carbon     Catalytic ozonation     External surface area     Surface reaction     Hydroxyl radical    

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Preparation of adsorptive nanoporous membrane using powder activated carbon: Isotherm and thermodynamic

Majid Peyravi

《化学科学与工程前沿（英文）》 2020年 第14卷 第4期   页码 673-687 doi: 10.1007/s11705-019-1800-9

摘要： Adsorptive polyethesulfone (PES) membranes were prepared by intercalation of powder activated carbon (PAC) with and without functionalization. Accordingly, PAC was aminated with 1,5-diamino-2-methylpentane, and the physicochemical properties of the functionalized PAC were analyzed. Intercalation of PAC within the PES scaffold changed the porosity and mean pore size of the aminated membrane (AC-NH ) from 52.6% to 92.5% and from 22.6 nm to 3.5 nm, respectively. The effect of temperature on the performance of the modified membranes was monitored by the flux and chemical oxygen demand (COD) removal of leachate. At ambient temperature, the COD removal of the neat, AC-containing, and AC-NH membranes was 47%, 52%, and 58.5%, respectively. A similar increment was obtained for the membrane flux, which was due to the synergistic effect of the high porosity and large number of hydrophilic functional groups. The experimental leachate adsorption data were analyzed by Langmuir, Freundlich, and Dubinin- Radushkevich isotherm models. For all membranes, the significant thermodynamic parameters ( , , and ) were calculated and compared. The isosteric heat of adsorption was lower than 80 kJ∙mol , indicating that the interaction between the membranes and the leachate is mainly physical, involving weak van der Waals forces.

关键词： amine functionality     nanoporous membrane     adsorption isotherm     thermodynamic parameters     landfill leachate    

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Removal of Cu(II) ions from aqueous solution by activated carbon impregnated with humic acid

LIU Hanchao,FENG Suping,ZHANG Nannan,DU Xiaolin,LIU Yongli

《环境科学与工程前沿（英文）》 2014年 第8卷 第3期   页码 329-336 doi: 10.1007/s11783-013-0553-9

摘要： Humic acid (HA) was impregnated onto powdered activated carbon to improve its Cu(II) adsorption capability. The optimum pH value for Cu(II) removal was 6. The maximum adsorption capacity of HA-impregnated activated carbon was up to 5.98 mg·g , which is five times the capacity of virgin activated carbon. The adsorption processes were rapid and accompanied by changes in pH. In using a linear method, it was determined that the equilibrium experimental data were better represented by the Langmuir isotherm than by the Freundlich isotherm. Surface charges and surface functional groups were studied through zeta potential and FTIR measurements to explain the mechanism behind the humic-acid modification that enhanced the Cu(II) adsorption capacity of activated carbon.

关键词： adsorption     humic acid     activated carbon     heavy metal ions    

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Evaluate HAA removal in biologically active carbon filters using the ICR database

Hsin-hsin TUNG, Yuefeng F. XIE

《环境科学与工程前沿（英文）》 2011年 第5卷 第4期   页码 489-496 doi: 10.1007/s11783-011-0312-8

摘要： The effects of biologically active carbon (BAC) filtration on haloacetic acid (HAA) levels in plant effluents and distribution systems were investigated using the United States Environmental Protection Agency’s Information Collection Rule (ICR) database. The results showed that average HAA5 concentrations in all locations were 20.4 μg·L and 29.6 μg·L in ICR plants with granular activated carbon (GAC) and ICR plants without GAC process, respectively. For plants without GAC, the highest HAA levels were observed in the quarters of April to June and July to September. However, for plants with GAC, the highest HAA levels were observed in the quarters of April to June and January to March. This HAA level profile inversely correlated well with water temperature, or biologic activity. For GAC plants, simulated distribution samples matched well with distribution system equivalent samples for Cl AA and THMs. For plants with and without GAC, simulated distribution samples overestimated readily biodegradable HAAs in distribution systems. The study indicated that through HAA biodegradation, GAC process plays an important role in lowering HAA levels in finished drinking water.

关键词： biologically active carbon (BAC)     disinfection byproduct (DBP)     granular activated carbon (GAC)     haloacetic acid (HAA)     Information Collection Rule (ICR)    

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Effect of textural property of coconut shell-based activated carbon on desorption activation energy of

YU Moxin, LI Zhong, XI Hongxia, XIA Qibin, WANG Shuwen

《化学科学与工程前沿（英文）》 2008年 第2卷 第3期   页码 269-275 doi: 10.1007/s11705-008-0056-6

摘要： In this work, the effect of the textural property of activated carbons on desorption activation energy and adsorption capacity for benzothiophene (BT) was investigated. BET surface areas and the textural parameters of three kinds of the activated carbons, namely SY-6, SY-13 and SY-19, were measured with an ASAP 2010 instrument. The desorption activation energies of BT on the activated carbons were determined by temperature-programmed desorption (TPD). Static adsorption experiments were carried out to determine the isotherms of BT on the activated carbons. The influence of the textural property of the activated carbons on desorption activation energy and the adsorption capacity for BT was discussed. Results showed that the BET surface areas of the activated carbons, SY-6, SY-13 and SY-19 were 1106, 1070 and 689 mg, respectively, and their average pore diameters were 1.96, 2.58 and 2.16 nm, respectively. The TPD results indicated that the desorption activation energy of BT on the activated carbons, SY-6, SY-19 and SY-13 were 58.84, 53.02 and 42.57 KJ/mol, respectively. The isotherms showed that the amount of BT adsorbed on the activated carbons followed the order of SY-6 > SY-19 > SY-13. The smaller the average pore diameter of the activated carbon, the stronger its adsorption for BT and the higher the activation energy required for BT desorption on its surface. The Freundlich adsorption isotherm model can be properly used to formulate the adsorption behavior of BT on the activated carbons.

关键词： diameter     adsorption isotherm     ASAP     SY-19 >     activated    

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Chitosan/polyethylene glycol impregnated activated carbons: Synthesis, characterization and adsorption

Ehsan Salehi, Fereshteh Soroush, Maryam Momeni, Aboulfazl Barati, Ali Khakpour

《化学科学与工程前沿（英文）》 2017年 第11卷 第4期   页码 575-585 doi: 10.1007/s11705-017-1650-2

摘要： Novel modified activated carbons (ACs) with enhanced adsorptive properties were obtained coating by chitosan (CS), polyethylene glycol (PEG) and blends of the two polymers (0:1, 1:0, 1:1, 1:2 and 2:1 wt/wt) on ACs by an impregnation technique. The adsorption performances of the pristine, acidified and polymer-impregnated ACs were studied using methylene blue as a model adsorbate. The adsorbents were characterized using Fourier transform infrared spectroscopy, scanning electron microscopy and abrasion hardness tests. The average coating thicknesses were between 10 to 23 microns. The pore sizes, pore densities and pore capacities of the activated carbons increased as the wt-% PEG in the coating increased. The highest adsorption capacity (424.7 mg/g) was obtained for the chitosan-coated ACs and this adsorption was well described by the Langmuir isotherm model. The kinetic results were best described by the pseudo-second-order kinetic model. The highest rate constant was obtained with the ACs modified with the CS:PEG (2:1) coating and this result was almost 2.6 times greater than that of the unmodified ACs. The CS/PEG impregnated ACs also displayed superior hardness (~90%), compared to unmodified ACs (~85%). Overall the chitosan had a greater effect on improving adsorption capacity whereas the polyethylene glycol enhanced the adsorption rate.

关键词： carbon biocomposites     impregnation     chitosan     polyethylene glycol     image processing    

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Continuous flow removal of acid fuchsine by dielectric barrier discharge plasma water bed enhanced by activatedcarbon adsorption

Rusen Zhou, Renwu Zhou, Xianhui Zhang, Kateryna Bazaka, Kostya (Ken) Ostrikov

《化学科学与工程前沿（英文）》 2019年 第13卷 第2期   页码 340-349 doi: 10.1007/s11705-019-1798-z

摘要： Continuous processes which allow for large amount of wastewater to be treated to meet drainage standards while reducing treatment time and energy consumption are urgently needed. In this study, a dielectric barrier discharge plasma water bed system was designed and then coupled with granular activated carbon (GAC) adsorption to rapidly remove acid fuchsine (AF) with high efficiency. Effects of feeding gases, treatment time and initial concentration of AF on removal efficiency were investigated. Results showed that compared to the N and air plasmas treatments, O plasma processing was most effective for AF degradation due to the strong oxidation ability of generated activated species, especially the OH radicals. The addition of GAC significantly enhanced the removal efficiency of AF in aqueous solution and shorten the required time by 50%. The effect was attributed to the ability of porous carbon to trap and concentrate the dye, increasing the time dye molecules were exposed to the plasma treated solution, and to enhance the production of OH radicals on/in GAC to boost the degradation of dyes by plasma as well as in situ regenerate the exhausted GAC. The study offers a new opportunity for continuous effective remediation of wastewater contaminated with organic dyes using plasma technologies.

关键词： continuous removal     dye-containing wastewater     dielectric barrier discharge     plasma water bed     activated carbon adsorption    

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标题 作者 时间 类型 操作

Fluorescence spectroscopic studies of the effect of granular activated carbon adsorption on structural

Shuang XUE, Qingliang ZHAO, Liangliang WEI, Xiujuan HUI, Xiping MA, Yingzi LIN

期刊论文

Influence of pore structure on biologically activated carbon performance and biofilm microbial characteristics

期刊论文

Adsorption of benzene and toluene from waste gas using activated carbon activated by ZnCl

Leila KARIMNEZHAD,Mohammad HAGHIGHI,Esmaeil FATEHIFAR

期刊论文

Kinetics and thermodynamics of the phosphine adsorption on the modified activated carbon

Bingnan REN

期刊论文

The influence of chlorinated aromatics' structure on their adsorption characteristics on activated carbon

Pengfei LIN,Yuan ZHANG,Xiaojian ZHANG,Chao CHEN,Yuefeng XIE,Irwin H SUFFET

期刊论文

Preparation and adsorption performances of mesopore-enriched bamboo activated carbon

WANG Yuxin, LIU Congmin, ZHOU Yaping

期刊论文

Removal of phenol by powdered activated carbon adsorption

Yan MA, Naiyun GAO, Wenhai CHU, Cong LI

期刊论文

Kinetics of enhanced adsorption by polarization for organic pollutants on activated carbon fiber

HAN Yanhe, QUAN Xie, ZHAO Huimin, CHEN Shuo, ZHAO Yazhi

期刊论文

Significant enhancement in catalytic ozonationefficacy: From granular to super-fine powdered activatedcarbon

Tianyi Chen, Wancong Gu, Gen Li, Qiuying Wang, Peng Liang, Xiaoyuan Zhang, Xia Huang

期刊论文

Preparation of adsorptive nanoporous membrane using powder activated carbon: Isotherm and thermodynamic

Majid Peyravi

期刊论文

Removal of Cu(II) ions from aqueous solution by activated carbon impregnated with humic acid

LIU Hanchao,FENG Suping,ZHANG Nannan,DU Xiaolin,LIU Yongli

期刊论文

Evaluate HAA removal in biologically active carbon filters using the ICR database

Hsin-hsin TUNG, Yuefeng F. XIE

期刊论文

Effect of textural property of coconut shell-based activated carbon on desorption activation energy of

YU Moxin, LI Zhong, XI Hongxia, XIA Qibin, WANG Shuwen

期刊论文

Chitosan/polyethylene glycol impregnated activated carbons: Synthesis, characterization and adsorption

Ehsan Salehi, Fereshteh Soroush, Maryam Momeni, Aboulfazl Barati, Ali Khakpour

期刊论文

Continuous flow removal of acid fuchsine by dielectric barrier discharge plasma water bed enhanced by activatedcarbon adsorption

Rusen Zhou, Renwu Zhou, Xianhui Zhang, Kateryna Bazaka, Kostya (Ken) Ostrikov

期刊论文