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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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Adsorption of herring sperm DNA onto pine sawdust biochar: Thermodynamics and site energy distribution

《环境科学与工程前沿（英文）》 2022年 第16卷 第11期 doi: 10.1007/s11783-022-1579-7

摘要：

● Adsorption of environmental deoxyribonucleic acid on biochar was studied.

关键词： Environmental deoxyribonucleic acid     Antibiotic resistance genes     Biochar     Adsorption thermodynamics    

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Removal of Rhodamine B from aqueous solutions and wastewater by walnut shells: kinetics, equilibrium and thermodynamics

Jasmin Shah, M. Rasul Jan, Attaul Haq, Younas Khan

《化学科学与工程前沿（英文）》 2013年 第7卷 第4期   页码 428-436 doi: 10.1007/s11705-013-1358-x

摘要： An adsorption study of Rhodamine B (RB) dye from aqueous solutions was carried out using walnut shells pretreated by different methods. In addition to the effects of the pretreatment, the effects of various parameters like pH, adsorbent dose, contact time, initial dye concentration and temperature on the adsorption of RB was studied. The adsorption process was highly pH dependent and a maximum adsorption was achieved at pH 3.0. The best fit for the rates of dye adsorption was a pseudo-second-order kinetic model with good correlation coefficients ( >0.99). Langmuir isotherms were used to determine that the maximum loading capacity of the different walnut shells and the RB capacities ranged from 1.451–2.292 mg·g . The dye adsorption was also evaluated thermodynamically. Positive standard enthalpy (? °) values were obtained indicating that the RB adsorption process is endothermic as well as ? ° and ? ° values showed that adsorption process is spontaneous with an increased randomness at the solid-liquid interface. Desorption studies were carried out to explore the feasibility of regenerating the used walnut shells and it was found that 97.71%–99.17% of the retained RB was recovered with 0.1 mol?L NaOH solution. The walnut shells were also successfully used to remove RB from industrial effluents.

关键词： Rhodamine B     walnut shell adsorption     kinetics     isotherms     regeneration    

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Facile synthesis of α-MnO

Weixin ZHANG, Wenran ZHAO, Zaoyuan ZHOU, Zeheng YANG

《化学科学与工程前沿（英文）》 2014年 第8卷 第1期   页码 64-72 doi: 10.1007/s11705-014-1402-5

摘要： In this paper, α-MnO micronests composed of nanowires were fabricated via a hydrothermal reaction of MnSO ·H O and K S O solutions. The α-MnO micronests were demonstrated to have a higher adsorption capacity than γ-MnO microspheres due to their large specific surface area. The amount of Congo red adsorbed per unit weight of α-MnO micronests increased significantly from 114 to 282 mg·g with concentration of Congo red solution increasing from 50 to 200 mg·L , but it had a little change with temperature. Kinetics, isotherms and thermodynamics for the adsorption of Congo red on α-MnO micronests were examined. The adsorption process followed the pseudo-second-order kinetics with good correlation. The experimental data were analyzed by Langmuir and Freundlich models, and equilibrium data fitted the Langmuir isotherm very well with maximum monolayer adsorption capacity of 625 mg·g at 22 °C. The adsorption was spontaneous and endothermic according to thermodynamic studies. The experimental results indicate that α-MnO micronests possess a high adsorption capacity and could be employed as a replacement of traditional sorbents.

关键词： MnO2     Congo red     adsorption     kinetics     isotherm     thermodynamics    

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Biosorption of Cr(VI) by carbonized

Jinfa CHEN,Ping YANG,Dagang SONG,Sha YANG,Li ZHOU,Lei HAN,Bo LAI

《环境科学与工程前沿（英文）》 2014年 第8卷 第6期   页码 960-966 doi: 10.1007/s11783-013-0612-2

摘要： High quality and low cost carbon can be prepared from ( ) and Buckwheat straw. The biosorbent was used for Cr(VI) removal. The effect of experimental parameters, such as pH, sorbent dosage and temperature were examined and the optimal experimental condition was determined. Solution pH is found influencing the adsorption. Cr(VI) removal efficiency is found to be maximum (98%) at pH= 1. Langmuir and Freundlich adsorption isotherms were applicable to the adsorption process and their constants were evaluated. The adsorption data obtained agreed well with the Langmuir sorption isotherm model. The maximum adsorption capacities for Cr(VI) ranged from 46.23 to 55.19 mg·g for temperature between 298 K and 308 K under the condition of pH= 1.0. Thermodynamic parameters such as free energy change ( ), enthalpy ( ) and entropy ( ) indicate a spontaneous, endothermic and increased randomness nature of Cr(VI) adsorption. Studies found that the raw and buckwheat straw mixed materials with simple treatment had a high efficiency for the removal of Cr(VI) and would be a promising adsorbent.

关键词： Eupatorium adenophorum     buckwheat straw     adsorption     Cr(VI)     thermodynamics    

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Self-catalytic pyrolysis thermodynamics of waste printed circuit boards with co-existing metals

《环境科学与工程前沿（英文）》 2022年 第16卷 第11期 doi: 10.1007/s11783-022-1581-0

摘要：

● The co-existing metals in WPCBs has positive catalytic influence in pyrolysis.

关键词： Waste printed circuit board     Catalyst     Pyrolysis     Kinetics    

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Latest progress in numerical simulations on multiphase flow and thermodynamics in production of natural

Lin ZUO, Lixia SUN, Changfu YOU

《能源前沿（英文）》 2009年 第3卷 第2期   页码 152-159 doi: 10.1007/s11708-009-0017-x

摘要： Natural gas hydrates are promising potential alternative energy resources. Some studies on the multiphase flow and thermodynamics have been conducted to investigate the feasibility of gas production from hydrate dissociation. The methods for natural gas production are analyzed and several models describing the dissociation process are listed and compared. Two prevailing models, one for depressurization and the other for thermal stimulation, are discussed in detail. A comprehensive numerical method considering the multiphase flow and thermodynamics of gas production from various hydrate-bearing reservoirs is required to better understand the dissociation process of natural gas hydrate, which would be of great benefit to its future exploration and exploitation.

关键词： numerical simulation     natural gas hydrate     dissociation     thermodynamics     multiphase flow    

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Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric

《环境科学与工程前沿（英文）》 2023年 第17卷 第9期 doi: 10.1007/s11783-023-1707-z

摘要：

● EPS immobilizes U(VI) via adsorption, bioreduction and desorption.

关键词： Adsorption     Bioreduction     Desorption     Kinetics     Isotherm     Uranium    

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Polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions

《环境科学与工程前沿（英文）》 2022年 第16卷 第1期   页码 3-3 doi: 10.1007/s11783-021-1437-z

摘要：

Microplastics (MPs) are widely present in a variety of environmental media and have attracted more and more attention worldwide. However, the effect of MPs on the interaction between heavy metals and soil, especially in soil solid fraction level, is not well understood. In this study, batch experiments were performed to investigate the adsorption characteristics of Cd in bulk soil and three soil solid fractions (i.e. particulate organo matter (POM), organic-mineral compounds (OMC), and mineral) with or without polypropylene (PP) MPs.

关键词： Polypropylene microplastics     Cadmium     Adsorption     POM     OMC     Mineral    

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Cesium removal from radioactive wastewater by adsorption and membrane technology

《环境科学与工程前沿（英文）》 2023年 第18卷 第3期 doi: 10.1007/s11783-024-1798-1

摘要：

● Removal of cesium from radioactive wastewater is still a challenging.

关键词： Cesium     Adsorption     Membrane separation     Advanced liquid processing system     Fukushima nuclear accident    

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Dual-functional sites for synergistic adsorption of Cr(VI) and Sb(V) by polyaniline-TiO hydrate: Adsorption

《环境科学与工程前沿（英文）》 2022年 第16卷 第8期 doi: 10.1007/s11783-022-1526-7

摘要：

• PANI/Ti(OH)n(4–n)+ exhibited excellent adsorption capacity and reusability.

关键词： Polyaniline/TiO2     Chromium     Antimony     Adsorption     Desorption     Mechanism    

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Optimization of the power, efficiency and ecological function for an air-standard irreversible Dual-Miller cycle

Zhixiang WU, Lingen CHEN, Yanlin GE, Fengrui SUN

《能源前沿（英文）》 2019年 第13卷 第3期   页码 579-589 doi: 10.1007/s11708-018-0557-z

摘要： This paper establishes an irreversible Dual-Miller cycle (DMC) model with the heat transfer (HT) loss, friction loss (FL) and other internal irreversible losses. To analyze the effects of the cut-off ratio ( ) and Miller cycle ratio ( ) on the power output ( ), thermal efficiency ( ) and ecological function ( ), obtain the optimal and optimal , and compare the performance characteristics of DMC with its simplified cycles and with different optimization objective functions, the , and of irreversible DMC are analyzed and optimized by applying the finite time thermodynamic (FTT) theory. Expressions of , and are derived. The relationships among , , and compression ratio ( ) are obtained by numerical examples. The effects of and on , , , maximum power output ( ), maximum efficiency ( ) and maximum ecological function ( ) are analyzed. Performance differences among the DMC, the Otto cycle (OC), the Dual cycle (DDC), and the Otto-Miller cycle (OMC) are compared for fixed design parameters. Performance characteristics of irreversible DMC with the choice of , and as optimization objective functions are analyzed and compared. The results show that the irreversible DMC engine can reach a twice-maximum power, a twice-maximum efficiency, and a twice-maximum ecological function, respectively. Moreover, when choosing as the optimization objective, there is a 5.2% of improvement in while there is a drop of only 2.7% in compared to choosing as the optimization objective. However, there is a 5.6% of improvement in while there is a drop of only 1.3% in compared to choosing as the optimization objective.

关键词： finite-time thermodynamics     Dual-Miller cycle     power output     thermal efficiency     ecological function    

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An adsorption study of

Lingxiao FU, Jianhua ZU, Enxi GU, Huan WANG, Linfeng HE

《能源前沿（英文）》 2020年 第14卷 第1期   页码 11-17 doi: 10.1007/s11708-019-0634-y

摘要： Nanoscale zero-valent iron (nZVI) supported on D001 resin (D001-nZVI) was synthesized for adsorption of high solubility and mobility radionuclide Tc. Re(VII), a chemical substitute for Tc, was utilized in batch experiments to investigate the feasibility and adsorption mechanism toward Tc(VII). Factors (pH, resin dose) affecting Re(VII) adsorption were studied. The high adsorption efficiency of Re(VII) at pH= 3 and the solid-liquid ratio of 20 g/L. X-ray diffraction patterns revealed the reduction of into ReO immobilized in D001-nZVI. Based on the optimum conditions of Re(VII) adsorption, the removal experiments of Tc(VII) were conducted where the adsorption efficiency of Tc(VII) can reach 94%. Column experiments showed that the Thomas model gave a good fit to the adsorption process of Re(VII) and the maximum dynamic adsorption capacity was 0.2910 mg/g.

关键词： technetium     nanoscale zero-valent iron (nZVI)     D001 resin     adsorption    

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Room temperature liquid metal: its melting point, dominating mechanism and applications

Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU

《能源前沿（英文）》 2020年 第14卷 第1期   页码 81-104 doi: 10.1007/s11708-019-0653-8

摘要： The room temperature liquid metal (LM) is recently emerging as a new class of versatile materials with fascinating characteristics mostly originated from its simultaneous metallic and liquid natures. The melting point is a typical parameter to describe the peculiarity of LM, and a pivotal factor to consider concerning its practical applications such as phase change materials (PCMs) and advanced thermal management. Therefore, the theoretical exploration into the melting point of LM is an essential issue, which can be of special value for the design of new LM materials with desired properties. So far, some available strategies such as molecular dynamics (MD) simulation and classical thermodynamic theory have been applied to perform correlative analysis. This paper is primarily dedicated to performing a comprehensive overview regarding typical theoretical strategies on analyzing the melting points. It, then, presents evaluations on several factors like components, pressure, size and supercooling that may be critical for melting processes of liquid metal. After that, it discusses applications associated with the characteristic of low melting points of LM. It is expected that a great many fundamental and practical works are to be conducted in the coming future.

关键词： melting point     liquid metal     crystal     thermodynamics     molecular dynamics    

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Dialdehyde cellulose nanocrystal cross-linked chitosan foam with high adsorption capacity for removal

《化学科学与工程前沿（英文）》 2023年 第17卷 第7期   页码 853-866 doi: 10.1007/s11705-022-2256-x

摘要： The discharge of large amounts of dye-containing wastewater seriously threats the environment. Adsorbents have been adopted to remove these dyes present in the wastewater. However, the high adsorption capacity, predominant pH-responsibility, and excellent recyclability are three challenges to the development of efficient adsorbents. The poly(acryloxyethyl trimethylammonium chloride)-graft-dialdehyde cellulose nanocrystals were synthesized in our work. Subsequently, the cationic dialdehyde cellulose nanocrystal cross-linked chitosan nanocomposite foam was fabricated via freeze-drying of the hydrogel. Under the optimal ratio of the cationic dialdehyde cellulose nanocrystal/chitosan (w/w) of 12/100, the resultant foam (Foam-12) possesses excellent absorption properties, such as high porosity, high content of active sites, strong acid resistance, and high amorphous region. Then, Foam-12 was applied as an eco-friendly adsorbent to remove acid red 134 (a representative of anionic dyes) from aqueous solutions. The maximum dye adsorption capacity of 1238.1 mg∙g‒1 is achieved under the conditions of 20 mg∙L‒1 adsorbents, 100 mg∙L‒1 dye, pH 3.5, 24 h, and 25 °C. The dominant adsorption mechanism for the anionic dye adsorption is electrostatic attraction, and Foam-12 can effectively adsorb acid red 134 at pH 2.5–5.5 and be desorbed at pH 8. Its easy recovery and good reusability are verified by the repeated acid adsorption–alkaline desorption experiments.

关键词： chitosan foam     cellulose nanocrystals     acid red 134     adsorption    

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标题 作者 时间 类型 操作

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

Bingnan REN

期刊论文

Adsorption of herring sperm DNA onto pine sawdust biochar: Thermodynamics and site energy distribution

期刊论文

Removal of Rhodamine B from aqueous solutions and wastewater by walnut shells: kinetics, equilibrium and thermodynamics

Jasmin Shah, M. Rasul Jan, Attaul Haq, Younas Khan

期刊论文

Facile synthesis of α-MnO

Weixin ZHANG, Wenran ZHAO, Zaoyuan ZHOU, Zeheng YANG

期刊论文

Biosorption of Cr(VI) by carbonized

Jinfa CHEN,Ping YANG,Dagang SONG,Sha YANG,Li ZHOU,Lei HAN,Bo LAI

期刊论文

Self-catalytic pyrolysis thermodynamics of waste printed circuit boards with co-existing metals

期刊论文

Latest progress in numerical simulations on multiphase flow and thermodynamics in production of natural

Lin ZUO, Lixia SUN, Changfu YOU

期刊论文

Contributions of adsorption, bioreduction and desorption to uranium immobilization by extracellular polymeric

期刊论文

Polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions

期刊论文

Cesium removal from radioactive wastewater by adsorption and membrane technology

期刊论文

Dual-functional sites for synergistic adsorption of Cr(VI) and Sb(V) by polyaniline-TiO hydrate: Adsorption

期刊论文

Optimization of the power, efficiency and ecological function for an air-standard irreversible Dual-Miller cycle

Zhixiang WU, Lingen CHEN, Yanlin GE, Fengrui SUN

期刊论文

An adsorption study of

Lingxiao FU, Jianhua ZU, Enxi GU, Huan WANG, Linfeng HE

期刊论文

Room temperature liquid metal: its melting point, dominating mechanism and applications

Junheng FU, Chenglin ZHANG, Tianying LIU, Jing LIU

期刊论文

Dialdehyde cellulose nanocrystal cross-linked chitosan foam with high adsorption capacity for removal

期刊论文