资源类型

期刊论文 182

年份

2023 8

2022 11

2021 15

2020 15

2019 6

2018 9

2017 10

2016 6

2015 8

2014 18

2013 9

2012 10

2011 12

2010 7

2009 10

2008 7

2007 9

2006 1

2005 2

2004 1

展开 ︾

关键词

精密定轨 3

GPS 2

6016 合金 1

7815 1

Backbone 1

DORIS 1

EDI 1

Si/Al 比值 1

T试剂 1

不正常航班管理 1

不相容问题 1

不确定时延 1

二氧化钛 1

光催化 1

光合产物 1

全息胚 1

全球卫星定位系统(GPS) 1

全球定位系统 1

冬小麦 1

展开 ︾

检索范围：

排序： 展示方式：

Removal of lead from aqueous solution by hydroxyapatite/manganese dioxide composite

Lijing DONG,Zhiliang ZHU,Yanling QIU,Jianfu ZHAO

《环境科学与工程前沿（英文）》 2016年 第10卷 第1期   页码 28-36 doi: 10.1007/s11783-014-0722-5

摘要： A novel composite adsorbent, hydroxyapatite/manganese dioxide (HAp/MnO ), has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO is meant to increase its adsorption capacity. Various factors that may affect the adsorption efficiency, including solution pH, coexistent substances such as humic acid and competing cations (Ca , Mg ), initial solute concentration, and the duration of the reaction, have been investigated. Using this composite adsorbent, solution pH and coexistent calcium or magnesium cations were found to have no significant influence on the removal of lead ions under the experimental conditions. The adsorption equilibrium was described well by the Langmuir isotherm model, and the calculated maximum adsorption capacity was 769 mg·g . The sorption processes obeyed the pseudo-second-order kinetics model. The experimental results indicate that HAp/MnO composite may be an effective adsorbent for the removal of lead ions from aqueous solutions.

关键词： lead     composite materials     manganese dioxide     hydroxyapatite     adsorption    

HTML PDF 收藏

Investigation of phosphate adsorption from an aqueous solution using spent fluid catalytic cracking catalyst

Zhen Li, Zhaofu Qiu, Ji Yang, Benteng Ma, Shuguang Lu, Chuanhui Qin

《环境科学与工程前沿（英文）》 2018年 第12卷 第6期 doi: 10.1007/s11783-018-1082-3

摘要：

Spent FCC catalyst with lanthanum is proposed as a novel P-removal adsorbent.

The spent FCC catalyst exhibits 99% adsorption efficiency for low P-concentration wastewater (C0 <5.0 mg/L).

High affinity, endothermic reaction and fast sorption kinetics are achieved.

The phosphate is adsorbed in the form of LaPO4 and KH2PO4.

关键词： Spent FCC catalyst     Phosphate removal     Adsorption     Lanthanum    

HTML PDF 收藏

Removal of rhodamine B from aqueous solution by BiPO

Lei LI, Jian XU, Changsheng GUO, Yuan ZHANG

《环境科学与工程前沿（英文）》 2013年 第7卷 第3期   页码 382-387 doi: 10.1007/s11783-013-0504-5

摘要： Hexahedron-like BiPO microcrystals were sucessfully synthesized via a template-free hydrothermal method. The resulting samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV–vis spectroscopy. The BiPO samples were of pure monoclinic phase, and the initial amount of during synthesis did not show obvious effect on the phase properties of the materials. The hexahedron-like BiPO microcrystal had explicitly cut edges, and its thickness was about 1 μm. The photocatalytic performance of the BiPO catalysts was evaluated by photodegradation of RhB under UV light irradiation with commerial Degussa P25 TiO as reference. Compared with P25, the BiPO catalysts displayed higher photocatalytic activity, with 98.7% of RhB degraded during 60-min experiment. Cost evaluation analysis was adopted to describe the energy consumption of the degradation process, and the results suggested the potential application of this material in the field of dye-contaminated wastewater treatment or environmental matrices remediation.

关键词： BiPO4     photocatalysis     Rhodamine B     cost evaluation    

HTML PDF 收藏

VALORIZATION OF BIOGAS THROUGH SIMULTANEOUS CO AND HS REMOVAL BY RENEWABLE AQUEOUS AMMONIA SOLUTION IN

《农业科学与工程前沿（英文）》 2023年 第10卷 第3期   页码 468-478 doi: 10.15302/J-FASE-2022473

摘要：

● Simultaneous H2S and CO2 removal from biogas is studied.

关键词： biomethane     biogas purification     CO2 removal     H2S removal     membrane absorption    

HTML PDF 收藏

Removal of sulfadiazine from aqueous solution on kaolinite

Jian XU, Yan HE, Yuan ZHANG, Changsheng GUO, Lei LI, Yuqiu WANG

《环境科学与工程前沿（英文）》 2013年 第7卷 第6期   页码 836-843 doi: 10.1007/s11783-013-0513-4

摘要： The adsorption of sulfadiazine onto kaolinite clay as an alternative adsorbent was examined in aqueous solution. Impacts of the contact time, pH, temperature, ionic strength and coexistent surfactants on the adsorption process were evaluated. The pH significantly influenced the adsorption process, with adsorption being promoted at lower pH due to the cation exchange mechanism. Decreasing ionic strength in the solution was favorable for adsorption, and the addition of cationic and anionic surfactants had negative effects on the adsorption capacity of sulfadiazine on kaolinite. Kinetic experiments showed that the adsorption followed the pseudo-second-order model. The equilibrium adsorption was well described by both Freundlich and Dubinin-Radushkevich (DR) models. According to the DR model, the adsorption mechanism was determined by cationic exchange and weak physical forces. The thermodynamic study showed that sulfadiazine adsorption onto kaolinite was a spontaneous and endothermic reaction.

关键词： adsorption     kaolinite     sulfadiazine     kinetics    

HTML PDF 收藏

Rheological behavior of PMVE-MA aqueous solution with metallic cations

Xiaoping DONG, Li LI, Jun XU, Xuhong GUO

《化学科学与工程前沿（英文）》 2011年 第5卷 第1期   页码 126-130 doi: 10.1007/s11705-010-0548-z

摘要： The rheological properties of aqueous solutions of poly(methyl vinyl ether-co-maleic anhydride) (PMVE-MA) upon addition of metallic cations at different pH values were investigated. Sol-gel transition and shear-thickening phenomena at moderate shear rate were observed upon increasing the amount of metallic cations, especially for cupric cation. At certain molar ratio ( ) of added cupric cations to carboxyl groups in PMVE-MA, the system became gel-like, and the storage modulus (G′) and loss modulus (G′′) were parallel and exhibited a power-law dependence on the frequency, which is consistent with Winter’s hypothesis of determining the gel point of a crosslinking system. The shear-thickening behavior depends on , pH, metallic valence, and temperature.

关键词： poly(methyl vinyl ether-co-maleic anhydride)     shear-thickening     gel point     rheology    

HTML PDF 收藏

Experimental study on oxidative decomposition of nitrobenzene in aqueous solution by honeycomb ceramic-catalyzed

ZHAO Lei, MA Jun, LIU Zhengqian, YANG Yixin, SUN Zhizhong

《环境科学与工程前沿（英文）》 2008年 第2卷 第1期   页码 44-50 doi: 10.1007/s11783-008-0012-1

摘要： The ozonation of nitrobenzene in aqueous solution was carried out in a semi-batch reactor to investigate the degradation efficiency, the effect factors, and the reaction mechanism, where honeycomb ceramic was used as a catalyst. The presence of honeycomb ceramic could improve the degradation rate of nitrobenzene by 15.46% compared to the results of ozonation alone. Under the conditions of this experiment, the degradation rate of honeycomb ceramic-catalyzed ozonation increased by 12.94% with the increase of the amount of catalyst from 1 to 5 blocks. The degradation rates all increased greatly with the increase of temperature and pH of the solution in the processes of honeycomb ceramic-catalyzed ozonation and ozonation alone. But, when the pH of the solution increased to 9.50, the advantage of the honeycomb ceramic-catalyzed ozonation process would be lost. The experimental findings indicated that in the processes of ozonation alone and honeycomb ceramic-catalyzed ozonation, nitrobenzene was primarily oxidized by OH free radical in aqueous solution. The adsorption of nitrobenzene was too limited to have an important influence on the degradation rate of nitrobenzene. With the same total dosage of applied ozone, the multiple step addition of ozone showed much higher removal efficiency than that obtained by one step in the two processes.
HTML PDF 收藏

Enhanced hydrogen production from aqueous methanol solution using TiO

Paramasivan GOMATHISANKAR,Tomoko NODA,Hideyuki KATSUMATA,Tohru SUZUKI,Satoshi KANECO

《化学科学与工程前沿（英文）》 2014年 第8卷 第2期   页码 197-202 doi: 10.1007/s11705-014-1417-y

摘要： The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide (TiO ) was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that only the addition of copper particles enhances the hydrogen production. The copper usage and reaction temperature were further optimized for TiO /Cu photocatalyts. Under the optimal conditions, the hydrogen production using TiO /Cu as photocatalysts is approximately 68 times higher than that obtained with only TiO .

关键词： photocatalytic hydrogen generation     methanol     copper particles     TiO2     metal-semiconductor interface    

HTML PDF 收藏

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    

HTML PDF 收藏

Effects of baffles on separation of aqueous ethanol solution with hollow fibers

Zhihong YANG, Guoliang ZHANG, Lan LIN, Danping REN, Qin MENG, Hongzi ZHANG

《化学科学与工程前沿（英文）》 2009年 第3卷 第1期   页码 68-72 doi: 10.1007/s11705-009-0130-8

摘要： The effects of baffles on the operation and mass-transfer characteristics in novel hollow fiber membrane contactor used in distillation were investigated. Hollow fiber membranes, coated with a 7 μm polydimethyl-siloxane, were operated as structural packing in the separation of ethanol-water solutions. The parallel flow mode was chosen for separation due to the stronger driving force of the concentration difference, in which liquid flows through the lumens of the fibers and vapor flows countercurrent-wise outside the fibers. Two baffles were installed on the shell side of the membrane contactors to enhance separation, which had a round shape with a semi-lunar hole. The results show that both baffled and unbaffled membrane contactors gave better, more productive separations than traditional packing in distillation, such as the excellent Sulzer Gauze BX structured packing. The baffled membrane contactors performed better than unbaffled ones, especially at high vapor velocities. The minimal HTU of membrane contactor with baffles could reach as low as 4.5 cm, and almost all the contactors could work well above the limit where flooding normally occurs in conventional cases. Theoretical analysis predicted that baffles helped membrane module to obtain a higher mass-transfer coefficient and a smaller mass-transfer resistance. Finally, theoretical mass-transfer coefficient and experimental value were compared as well as the contribution of each individual mass-transfer coefficients among liquid, gas and membrane.

关键词： hollow fiber     membrane contactor     baffle     mass-transfer     ethanol-water    

HTML PDF 收藏

Solution properties and self-association of multi-blocks like copolymer P(AM/AA) prepared by template

ZHANG Yuxi, WU Feipeng, LI Miaozhen, WANG Erjian

《化学科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 68-71 doi: 10.1007/s11705-007-0014-8

摘要： The association and properties of multi-block like copolymers (TP) of acrylamide (AM) and acrylic acid (AA) prepared by template copolymerization in aqueous solution were studied. The results showed that the copolymers of this type exhibited a significant structure effect compared with that of similar random copolymers (CP) obtained by copolymerization in the absence of template. Decreasing the value of pH or adding Ca ion to the copolymer solution will make phase separation occur. The TEM images demonstrated that the phase separation caused by Ca ion was due to the formation of extensively intermolecular cross-linking. With the increase of the pH value of copolymer solution, the changes of the solution viscosity was similar with that of homopolyacrylic acid, which originally increased and then decreased. But the increase range of template copolymer was higher than that of homopolyacrylic acid. TEM images indicated that at the maximal viscosity the copolymer obtained in the presence of template formed coiled aggregates.

关键词： aqueous solution     homopolyacrylic     copolymer solution     significant structure     presence    

HTML PDF 收藏

Removal of clofibric acid from aqueous solution by polyethylenimine-modified chitosan beads

Yao NIE,Shubo DENG,Bin WANG,Jun HUANG,Gang YU

《环境科学与工程前沿（英文）》 2014年 第8卷 第5期   页码 675-682 doi: 10.1007/s11783-013-0622-0

摘要： Polyethylenimine (PEI)-modified chitosan was prepared and used to remove clofibric acid (CA) from aqueous solution. PEI was chemically grafted on the porous chitosan through a crosslinking reaction, and the effects of PEI concentration and reaction time in the preparation on the adsorption of clofibric acid were optimized. Scanning electron microscopy (SEM) showed that PEI macromolecules were uniformly grafted on the porous chitosan, and the analysis of pore size distribution indicated that more mesopores were formed due to the crosslinking of PEI molecules in the macropores of chitosan. The PEI-modified chitosan had fast adsorption for CA within the initial 5 h, while this adsorbent exhibited an adsorption capacity of 349 mg·g for CA at pH 5.0 according to the Langmuir fitting, higher than 213 mg·g on the porous chitosan. The CA adsorption on the PEI-modified chitosan was pH-dependent, and the maximum adsorption was achieved at pH 4.0. Based on the surface charge analysis and comparison of different pharmaceuticals adsorption, electrostatic interaction dominated the sorption of CA on the PEI-modified chitosan. The PEI-modified chitosan has a potential application for the removal of some anionic micropollutants from water or wastewater.

关键词： clofibric acid     PEI-modified chitosan     adsorption capacity     adsorption mechanism     electrostatic interaction    

HTML PDF 收藏

Isolation of highly purity cellulose from wheat straw using a modified aqueous biphasic system

Lifeng YAN, Yi ZHAO, Qing GU, Wan LI

《化学科学与工程前沿（英文）》 2012年 第6卷 第3期   页码 282-291 doi: 10.1007/s11705-012-0901-5

摘要： Cellulose samples with molecular weights ranging from 8.39 × 10 to 11.00 × 10 g/mol were obtained from wheat straw. The dewaxed wheat straw was pretreated with aqueous hydrochloric acid followed by delignification using an environmentally benign poly(ethyleneglycol)/salt aqueous biphasic system. The yield of cellulose was in the range of 48.9%–55.5% and the cellulose contained 1.2%–3.2% hemicelluloses, and 0.97%–3.47% lignin. All the isolated cellulose samples could be directly dissolved in a 6 wt-% NaOH/4 wt-% urea aqueous solution through a precooling-thawing process to form a homogenous solution. The separation process was investigated and the obtained cellulose and its solution were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray apparatus, and X-ray diffraction. The results revealed that aqueous soluble cellulose can be directly prepared from wheat straw by this method and this study opens a novel pathway to prepare cellulosic materials from agricultural waste.

关键词： cellulose     straw     separation     aqueous solution    

HTML PDF 收藏

Unconventional hydrodynamics of hybrid fluid made of liquid metals and aqueous solution under applied

Xu-Dong ZHANG, Yue SUN, Sen CHEN, Jing LIU

《能源前沿（英文）》 2018年 第12卷 第2期   页码 276-296 doi: 10.1007/s11708-018-0545-3

摘要： The hydrodynamic characteristics of hybrid fluid made of liquid metal/aqueous solution are elementary in the design and operation of conductive flow in a variety of newly emerging areas such as chip cooling, soft robot, and biomedical practices. In terms of physical and chemical properties, such as density, thermal conductivity and electrical conductivity, their huge differences between the two fluidic phases remain a big challenge for analyzing the hybrid flow behaviors. Besides, the liquid metal immersed in the solution can move and deform when administrated with non-contact electromagnetic force, or even induced by redox reaction, which is entirely different from the cases of conventional contact force. Owing to its remarkable capability in flow and deformation, liquid metal immersed in the solution is apt to deform on an extremely large scale, resulting in marked changes on its boundary and interface. However, the working mecha- nisms of the movement and deformation of liquid metal lack appropriate models to describe such scientific issues via a set of well-established unified equations. To promote investigations in this important area, the present paper is dedicated to summarizing this unconventional hydrodynamics from experiment, theory, and simulation. Typical experimental phenomena and basic working mechanisms are illustrated, followed by the movement and deformation theories to explain these phenomena. Several representative simulation methods are then proposed to tackle the governing functions of the electrohydrodynamics. Finally, prospects and challenges are raised, offering an insight into the new physics of the hybrid fluid under applied fields.

关键词： liquid metal     hybrid fluid     hydrodynamics     surface tension     applied fields     self-actuation    

HTML PDF 收藏

Biosorption of Cr(III) from aqueous solution by freeze-dried activated sludge: Equilibrium, kinetic and

Qian YAO, Hua ZHANG, Jun WU, Liming SHAO, Pinjing HE,

《环境科学与工程前沿（英文）》 2010年 第4卷 第3期   页码 286-294 doi: 10.1007/s11783-010-0025-4

摘要： Batch biosorption experiments were conducted to remove Cr(III) from aqueous solutions using activated sludge from a sewage treatment plant. An investigation was conducted on the effects of the initial pH, contact time, temperature, and initial Cr(III) concentration in the biosorption process. The results revealed that the activated sludge exhibited the highest Cr(III) uptake capacity (120 mg·g) at 45°C, initial pH of 4, and initial Cr(III) concentration of 100 mg·L. The biosorption results obtained at various temperatures showed that the biosorption pattern accurately followed the Langmuir model. The calculated thermodynamic parameters, Δ (−0.8– −4.58 kJ·mol), Δ (15.6–44.4 kJ·mol), and Δ (0.06–0.15 kJ·mol·K) clearly indicated that the biosorption process was feasible, spontaneous, endothermic, and physical. The pseudo first-order and second-order kinetic models were adopted to describe the experimental data, which revealed that the Cr(III) biosorption process conformed to the second-order rate expression and the biosorption rate constants decreased with increasing Cr(III) concentration. The analysis of the values of biosorption activation energy ( = −7 kJ·mol) and the intra-particle diffusion model demonstrated that Cr(III) biosorption was film-diffusion-controlled.

关键词： activated sludge     biosorption     chromium     film diffusion     kinetics     thermodynamics    

HTML PDF 收藏

标题 作者 时间 类型 操作

Removal of lead from aqueous solution by hydroxyapatite/manganese dioxide composite

Lijing DONG,Zhiliang ZHU,Yanling QIU,Jianfu ZHAO

期刊论文

Investigation of phosphate adsorption from an aqueous solution using spent fluid catalytic cracking catalyst

Zhen Li, Zhaofu Qiu, Ji Yang, Benteng Ma, Shuguang Lu, Chuanhui Qin

期刊论文

Removal of rhodamine B from aqueous solution by BiPO

Lei LI, Jian XU, Changsheng GUO, Yuan ZHANG

期刊论文

VALORIZATION OF BIOGAS THROUGH SIMULTANEOUS CO AND HS REMOVAL BY RENEWABLE AQUEOUS AMMONIA SOLUTION IN

期刊论文

Removal of sulfadiazine from aqueous solution on kaolinite

Jian XU, Yan HE, Yuan ZHANG, Changsheng GUO, Lei LI, Yuqiu WANG

期刊论文

Rheological behavior of PMVE-MA aqueous solution with metallic cations

Xiaoping DONG, Li LI, Jun XU, Xuhong GUO

期刊论文

Experimental study on oxidative decomposition of nitrobenzene in aqueous solution by honeycomb ceramic-catalyzed

ZHAO Lei, MA Jun, LIU Zhengqian, YANG Yixin, SUN Zhizhong

期刊论文

Enhanced hydrogen production from aqueous methanol solution using TiO

Paramasivan GOMATHISANKAR,Tomoko NODA,Hideyuki KATSUMATA,Tohru SUZUKI,Satoshi KANECO

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

Effects of baffles on separation of aqueous ethanol solution with hollow fibers

Zhihong YANG, Guoliang ZHANG, Lan LIN, Danping REN, Qin MENG, Hongzi ZHANG

期刊论文

Solution properties and self-association of multi-blocks like copolymer P(AM/AA) prepared by template

ZHANG Yuxi, WU Feipeng, LI Miaozhen, WANG Erjian

期刊论文

Removal of clofibric acid from aqueous solution by polyethylenimine-modified chitosan beads

Yao NIE,Shubo DENG,Bin WANG,Jun HUANG,Gang YU

期刊论文

Isolation of highly purity cellulose from wheat straw using a modified aqueous biphasic system

Lifeng YAN, Yi ZHAO, Qing GU, Wan LI

期刊论文

Unconventional hydrodynamics of hybrid fluid made of liquid metals and aqueous solution under applied

Xu-Dong ZHANG, Yue SUN, Sen CHEN, Jing LIU

期刊论文

Biosorption of Cr(III) from aqueous solution by freeze-dried activated sludge: Equilibrium, kinetic and

Qian YAO, Hua ZHANG, Jun WU, Liming SHAO, Pinjing HE,

期刊论文