JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Hao Lei,Ning Pan,Xiaoqiang Wang,Hao Zou
A novel phytic acid impregnated polyaniline (PA-PANI) was synthesized by a in situ polymerization and supermolecular self-assembly method and has been used as an adsorbent for efficient capture of U(VI) from aqueous solution. The structure and morphology of the adsorbent were well characterized. The influence of different factors such as pH value, ionic strength, contact time, initial U(VI) concentration and temperature on the adsorption of U(VI) onto PA-PANI-3 were carried out by batch adsorption experiments. The results demonstrated an enhanced U(VI) adsorption capacity of 86.6 mg/g for PA-PANI-3, greatly exceeding that of polyaniline (PANI, 8.8 mg/g). The adsorption process follows the pseudo-second-order kinetic and Langmuir isotherm models with the theoretical maximum adsorption capacity of 90.3 mg/g. According to the calculation from the Dubinin–Radushkevich isotherm model equation, it is suggested that the adsorption is mainly a chemical adsorption mechanism. U(VI) is adsorbed on PA-PANI-3 via the phosphoric acid, amine, and imine groups. The U(VI) can be desorbed from the U(VI) adsorbed PA-PANI-3 with a desorption efficiency of 90.8% by using 0.1 mol/L Na2CO3 solution. This study demonstrated that PA-PANI could be used as an efficient adsorbent for removal and recovery of U(VI) from aqueous solution.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Alemtsehay Tesfay Reda,Dongxiang Zhang,Xin Lu
A composite material of europium hydroxide (Eu(OH) 3 ) and glycine (Gly) is synthesized successfully to produce single phase material (Eu(OH) 3 -Gly) which exhibits extremely selective capturing and high removal rate towards uranyl (UO 2 2+ ) ion in an aqueous solution. Eu(OH) 3 -Gly displayed distribution coefficient (K d ) of 3.23 × 10 7 mL/g and removal rate of 100% to lower UO 2 2+ ion concentration from 25 ppm to <1 ppb inside 15 min and these criteria place Eu(OH) 3 -Gly among the top existing adsorbents for such adsorption. Adsorption kinetics for UO 2 2+ follows pseudo-second-order model, proposing a chemisorption adsorption mechanism mainly via H 2 N-U-NH 2 and O-U-O interactions. Eu(OH) 3 -Gly showed good stability after the removal of uranyl ion as investigated by FT-IR and thermogravimetric analysis (TGA) methods. According to TG analysis, Eu(OH) 3 -Gly showed less weight loss (23.7%) after adsorption compared with that of before adsorption (32%), suggesting that the attachment of uranium to the adsorbent contributed for the improvement of the thermal stability of Eu(OH) 3 -Gly.
研究领域:
材料科学
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环境科学
·
放射化学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lihua Liu,Zhengchi Yang,Lu Zhao,Gang Su,Zuoxiao Wei,Anping Tang,Jianrong Xue
A novel poly(N 1 ,N 1 ,N 6 ,N 6 -tetraallylhexane-1,6-diammonium dichloride) (PTAHDADC) microparticle was prepared via inverse emulsion polymerization . The adsorption characteristics and mechanism for Mo(VI) in an aqueous solution were investigated systemically. Results showed that PTAHDADC had a high positively charge density with a positive charge at every six CH 2 (or CH ) units and presented a coral-like morphology, with macropores distributed in 30–130 μm, and a porosity of up to 46.52%. The Mo(VI) removal efficiency was >99% at pH = 3.0–4.0. The adsorption data could be effectively described using the Langmuir and pseudo-second-order kinetic models . The maximum adsorption capacity was up to 394.11 mg·g −1 at 293 K. The adsorption process was rapid, and reached equilibrium within 120 min with an adsorption activation energy E a of 41.15 kJ·mol −1 . The adsorption process of Mo(VI) by PTAHDADC was accompanied by the partial ion exchange of counterion Cl − , the partial deprotonation of functional groups ( CH 2 ) 3 N + H on PTAHDADC, and the new interaction and bond formation between Mo(VI) and PTAHDADC. Mo(VI) removal by PTAHDADC was a process of spontaneously endothermic entropy increment, which involves physisorption , electrostatic attraction, ion exchange, and chemisorption . PTAHDADC offers a simple synthesis and excellent adsorption performance and recyclability. Therefore, PTAHDADC is a highly potential adsorbent for removing Mo(VI) ions from wastewater and has a broad application prospect.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Xiaoliang Qi,Ruona Liu,Mengyu Chen,Zhipeng Li,Tao Qin,Yuna Qian,Shengzhe Zhao,Minchao Liu,Qiankun Zeng,Jianliang Shen
Polysaccharides are an important class of materials that are often exploited in the fields of food, agriculture, biomedical engineering and wastewater treatment owing to their unique and tunable properties. In this work, we utilize an inexpensive and sustainable extracellular polysaccharide salecan (EPS), which is produced by bacterium Agrobacterium sp. ZX09 , as a hydrogel matrix, poly(3-sulfopropyl methacrylate potassium salt) (PSM) as side chains to fabricate EPS-grafted-PSM adsorbents through a simple one-pot approach. Scanning electron microscope, X-ray diffraction, Fourier transformed infrared spectroscopy, rheometry and thermogravimetry were conducted to characterize the physicochemical properties of resultant adsorbents. We noticed that EPS not only served as the host chains of network to adjust the water uptake ability of adsorbents, but also endued them with tunable polarity. Further, the adsorption behaviors of developed adsorbents to copper ions (Cu 2+ ) were explored: these gels present high absorption ability for Cu 2+ through a chemical adsorption process which well described by Freundlich isotherm and pseudo-second-order kinetic models. In summary, the approach exhibited in this work opens a new avenue to design polysaccharide-based materials for Cu 2+ adsorption.
研究领域:
材料科学
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环境工程
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 9
·3787-3798
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IF 1.6
Liu Nana,Fang Ziyi,Xu Yunan,Xue Miao,Zhan Liyuan,Wang Binliang,Yuan Yijun
In response to the depletion of global uranium reserves and the radioactive contamination of wastewater, there is an urgent need to develop efficient, sustainable, and cost-effective uranium biosorbents. Herein, a green macroalga Rhizoclonium riparium was prepared for uranium (U(VI)) removal. The results showed that the maximum adsorption capacity of U(VI) was 80.96 mg g −1 (pH = 5, 298 K and 0.1 M NaNO 3 ). The kinetics, isotherms and thermodynamics analysis revealed that the adsorption process was chemisorption, homogeneous monolayer adsorption, endothermic and spontaneous. Through the mechanism characterization, it was proved the adsorbed of uranium on R. riparium was mainly controlled by the complexation between U(VI) and –OH, –COOH, –NH 2 . Besides, the R. riparium possess high selectivity towards uranium and good recycling performance. This work highlights new opportunities for biosorbents to be obtained directly from nature and used to remove radioactive contamination.
研究领域:
环境科学
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生物技术
✓ 已验证
DOI
高影响因子
Sustainability
·
2025
·Vol. 17
·期 7
·3060
·
IF 3.3
Junwei Feng,Gang Zhi,Xianjin Qi,Mengmeng Geng
Removing arsenic from industrial wastewater remains a crucial task. To protect public health and safety and address environmental pollution, there is an urgent need for a material that can efficiently remove arsenic from wastewater. In this study, a simple and highly efficient adsorbent, namely, a Co/Mn bimetallic-based organic framework (CoMn-MOF-74) adsorbent, was prepared by a hydrothermal synthesis method. Experimental results demonstrate that CoMn-MOF-74 exhibits excellent adsorption capacity for arsenic ions in wastewater. It was found that the optimal Co/Mn molar ratio of the adsorbent is 1:1. The CoMn-MOF-74 adsorbent compensates for the deficiencies in the adsorption performance of Co-MOF-74 and Mn-MOF-74, increasing the adsorption rate and the highest adsorption capacity. The maximum adsorption rate of CoMn-MOF-74 is 93.4%, and the highest adsorption capacity is 531 mg/g. Fitting CoMn-MOF-74 according to two categories of models, specifically, the adsorption isotherm and adsorption kinetics models, indicated that CoMn-MOF-74 adheres to the Langmuir model and pseudo-second-order kinetic model. The adsorption process is mainly chemical adsorption and monolayer adsorption. Analysis by XPS revealed that metal–oxygen groups and hydroxyl groups play important roles in the adsorption process. In conclusion, the CoMn-MOF-74 adsorbent shows excellent prospects in the field of arsenic adsorption from wastewater and is a promising arsenic-removing adsorbent.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2022
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IF 3.475
Yuxing Tong,Qunshan Yan,Song Gao,Bin Xiong,Xiangbing Tang,Zhichang Liu,Pengfei Li,Ming Huang,Ziwei Wang,Xi Le,Wei Pei,Zejun Dai,Zhe Xiong,Yi Wang
In this study, KMnO4 modification was proved to effectively increase the Ni2+ adsorption capacity of biomass. In order to clarify the KMnO4 modification mechanism, the Ni2+ adsorption characteristics of KMnO4 modified corncob (PPCB) under adsorption time, pH and Ni2+ concentration were studied. The results showed that the adsorption was the pseudo second-order kinetic process, indicating that chemisorption was the dominated process, which followed the Langmuir isotherm model and the highest Ni2+ adsorption capacity of PPCB reached 35.6 mg/g. By KMnO4 modification, the corncob was oxidized to generate carboxylates, and the MnO2 (reduction product) was loaded on the modified corncob, both carboxylates and MnO2 increased the Ni2+ adsorption capacity of PPCB. The molecular dynamic results indicated the carboxylate structures had the strongest adsorption capacity. Moreover, the Ni2+ removal efficiency of KMnO4 modified biomass decreased linearly with the increase of lignin content in biomass, while KMnO4 modified lignin showed a good adsorption performance, indicating that the cross-linked structures between lignin and other components in the biomass could inhibit the adsorption capacity of PPCB.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiao-han Pan,Ming-Jie Jin,Jian-hua Zu,Gang Han,Jing-jie Diao,Si-yu Liu,Qing Tang
For the efficient removal of radioactive iodide ions from medium and low radioactive contaminated water, an Ag-doped adsorbent was designed via radiation grafting method and chemical modification and applied based on the solid–liquid adsorption method. The silver loading content in the adsorbents could be flexibly decided by adjusting the sulfhydryl content. SEM/EDS, ATR, XPS, and XRD characterization methods were used to determine the features of the new adsorbents. With the silver content 67.9 mg/g and 125.6 mg/g in the adsorbents PGM25%-Ag + and PGM220%-Ag + respectively, the maximum I − adsorption capacities were varied at 29.92 mg/g and 100.82 mg/g. In wide pH conditions (pH7-11), PGM25%-Ag + was sufficient to achieve 131 I removal efficiency of over 92 %, and the removal efficiency was almost unaffected in the coexistence of high concentration (10 mmol/L) of anions and complex real contaminated seawater, highlighting the applicability and selectivity of the adsorbent. The adsorption behavior conformed to the Langmuir isothermal model and pseudo-second-order kinetics model. XPS analysis confirmed that excellent adsorption capacity and selectivity were attributed to the chemical adsorption mechanism of ion exchange and complexation occurs between I − and Ag on the solid–liquid interface, where AgI precipitation formed. In addition, the Ag + -doping adsorbent withstood the harsh conditions of 200 kGy irradiation by observing the ATR structure, thermal stability, and 131 I removal property. This study provides a feasible solution for the treatment of low and medium-radioactive contaminated seawater.
研究领域:
环境科学
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核化学
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材料科学
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1831-1838
·
IF 1.947
Mutyala Suresh,Yu Ya-Dong,Jin Wei-Guang,Wang Zhi-Shuo,Zheng Deng-Yue,Ye Chun-Rong,Luo Binbin
Composite material, tetraethylenepentamine (TEPA) incorporated UiO-66 was prepared by impregnation method to study CO 2 capture in a fixed bed reactor, atmospheric pressure. All synthesized adsorbents were characterized using PXRD, N 2 adsorption–desorption isotherms, FT-IR, TGA, SEM, and Elemental analysis. Characterization results have revealed that incorporated TEPA was present within pores of UiO-66. CO 2 adsorption was higher on TEPA incorporated UiO-66 compared to UiO-66. It was due to the chemical interaction between –NH 2 and CO 2 . High CO 2 adsorption capacity 3.70 mmol g −1 was obtained on 30TEPA/UiO-66 at 75 °C, 1 bar. Because of more flexibility and high dispersive nature of TEPA at this temperature. The same CO 2 adsorption capacity was obtained in each adsorption cycle without decomposition of the amine on 30TEPA/UiO-66. Avrami adsorption kinetic model has suggested adsorption of CO 2 on composite material was chemical adsorption and deactivation model suggested an initial rate of adsorption was higher on TEPA incorporated UiO-66.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Qianqian Tang,Hao Wu,Mingsong Zhou,Dongjie Yang
To remove Cr(VI) in water, a novel lignin-based anionic adsorption resin epichlorohydrin cross-linking lignin grafted by diethylenetriamine (E-DAL) was prepared by the direct cross-linking and curing of alkali lignin grafted by diethylenetriamine in aqueous solutions. Under the determined optimum synthesis conditions, E-DAL with higher nitrogen (7.46%) and lignin (32.78%) contents was obtained. Structural and physicochemical measurement results showed E-DAL was a macroporous resin, having a regular connected pore structure with porosity of 67.48% and pore size of 615.6 nm, also strong hydrophilicity, excellent acid-alkaline resistance and thermal stability. Adsorption experiment results indicated the adsorption isotherm of E-DAL to Cr(VI) was well-described by Langmuir model. E-DAL showed a higher adsorption capacity to Cr(VI), and the fitted maximum adsorption capacity reached up to 775.2 mg/g. Pseudo-second-order model could fit this adsorption process well, suggesting its chemisorption characteristics. The calculated thermodynamic parameters indicated a spontaneous and endothermic adsorption of E-DAL to Cr(VI). Dynamic column adsorption results showed E-DAL could completely remove Cr(VI) in wastewater. This whole preparation process only used a very small amount of cheaper amination agent and was relatively low-cost. This work provided efficient technical supports for the structural design of high-performance lignin-based anionic adsorption materials in water treatment field.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 22
·32935-32949
·
IF 0
Wang Junfeng,Wang Heng,Qi Xianjin,Zhi Gang,Wang Jianhua
The high cost and low adsorption capacity of primary metal-organic frameworks (ZIF-8) limit their application in heavy metal removal. In this paper, Co/Zn bimetallic MOF materials were synthesized with excellent adsorption performance for As 5+ . The adsorption reached equilibrium after 180 min and the maximum adsorption was 250.088 mg/g. In addition, Co-ZIF-8 showed strong selective adsorption of As 5+ . The adsorption process model of Co-ZIF-8 fits well with the pseudo-second-order kinetic model ( R 2 =0.997) and Langmuir isotherm model ( R 2 =0.994), and it is demonstrated that the adsorption behavior of the adsorbent is a single layer of chemical adsorption. In addition, when the adsorbent enters the arsenic-containing solution, the surface of Co-ZIF-8 is hydrolyzed to produce a large number of Co-OH active sites, and As 5+ arrives at the surface of Co-ZIF-8 by electrostatic adsorption and combines with the active sites to generate the arsenic-containing complex As-O-Co. After four cycles, Co-ZIF-8 showed 80% adsorption of As 5+ . This study not only provides a new method to capture As 5+ in water by preparing MOF with partial replacement of the central metal, but also has great significance for the harmless disposal of polluted water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengmin Hou,Ying Zhang,Qianqian Liao,Qianruo Chen
A novel adsorbent material, nylon@Fe 3 O 4 , was prepared by co-precipitation of nylon and FeSO 4 /FeCl 3 /NaOH solution. The structure of the composite was characterized using FTIR and TG methods. The results of FTIR and TG indicated that nylon@Fe 3 O 4 was successfully synthesized. The adsorption effect of nylon@Fe 3 O 4 on Cu(II) was explored under different experimental conditions. The optimum adsorption conditions of nylon@Fe 3 O 4 on Cu(II) were reached when the amount of composite was 12.50 mg, the concentration of Cu(II) was 15.36 mg/L, the reaction temperature was 50 °C, and the pH value was 9. Under the above conditions, the optimum adsorption efficiency was 94.67 % and the optimum adsorption capacity was 11.57 mg/g. The kinetic modeling indicated that the adsorption of nylon@Fe 3 O 4 belonged to chemisorption, and the initial adsorption rate (h = 69.92 mg/g/min) was larger, which indicated that the nylon@Fe 3 O 4 adsorption rate was faster. The adsorption isotherm experiments showed that the nylon@Fe 3 O 4 adsorption process occurred in the monomolecular layer adsorption, and the separation coefficients 0 < R L = 0.322/0.300/0.287 < 1, which indicated that the adsorption process of nylon@Fe 3 O 4 for Cu(II) was favorable adsorption. The adsorption thermodynamics showed that Δ G 0 < 0, Δ S 0 = 118 J/mol/K > 0, and Δ H 0 = 31.14 kJ/mol > 0, indicating that the adsorption process of nylon@Fe 3 O 4 on Cu(II) was spontaneous and favorable adsorption. Through 8 cycle experiments, the adsorption efficiency decreased from 94.67 % to 61.55 %, so nylon@Fe 3 O 4 had good regenerative performance. In conclusion, nylon@Fe 3 O 4 has potential applications in the adsorption of heavy metal ions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）