JOURNAL OF POLYMER RESEARCH
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2021
·Vol. 28
·期 6
·1-11
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IF 3.097
Hassan Muhammad,Afzal Annum,Tariq Muhammad,Ahmed Saad
This report deals with the simple development of a method for the uptake of cadmium ions by polymer adsorbent from the main sources of cadmium like water. The monomer is synthesized by reacting 2,4,6-trichloro-1,3,5-triazine with N(4-aminophenyl)acetamide. The adsorbents synthesis is completed by reacting a synthesized monomer with 1,3,5-tribenzoylchloride, terephthaloyl chloride, and isophthaloyl chloride. The as-synthesized polymer exhibits high molecular mass with narrow molecular weight distribution and good thermal stability. The metal ion adsorption study is established by using atomic absorption spectroscopy at optimized parameters, showing excellent adsorption capacity of polymer adsorbent. Further, the isothermal equilibrium adsorption study reveals the monolayer adoption of the metal ion by the Langmuir model with experimental and theoretical parameters, optimized by the linear regression analysis using the curve fitting tool in MATLAB software.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CHEMOSPHERE
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2021
·
IF 7.086
Xiaolan Hu,Changhong Chen,Dawei Zhang,Yingwen Xue
A facile method was used to prepare two-dimensional MXene for the treatment of heavy metal ions in wastewater. The adsorbent has good selectivity for the adsorption of Hg (Ⅱ) in mixed divalent cationic metal solutions due to a large number of oxygen-containing functional groups on the surface of the material. The adsorption of mercury was tested using mercuric chloride and mercury nitrate solutions. The Langmuir maximum adsorption capacity of the adsorbent at a pH of 5.0 and a temperature of 30 °C is 1057.3 mg/g (mercuric nitrate) and 773.29 mg/g (mercuric chloride), respectively. The adsorbent also maintains a high adsorption capacity at low pH (pH = 2.0). The removal rate of mercury-containing wastewater within 100 mg/L is nearly 100%. The chemical species of Hg-containing ions at different pH and temperatures was studied. It was found that the adsorbent could maintain a high adsorption capacity for different forms of Hg-containing ions.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Xiaoting Zhang,Mingyu Liu,Runping Han
In this study, a zirconium-based metal organic framework (UiO-66-NH 2 ) was prepared with a green synthetic method for removal of phosphate from solution. Several characterization methods were performed and the adsorption property of UiO-66-NH 2 toward phosphate was explored in batch mode. There was a good adsorption performance for phosphate with a wide range of pH (pH = 2–11) with a slight effect of salinity . The adsorption capacity was up to 43.9 mg·g –1 at 303 K from experiments. The adsorption isotherms can be better described by Langmuir, Temkin, and Koble-Corrigan model while adsorption kinetics can be well fitted by Pseudo-second-order, Double Constant and Elovich model. The process was spontaneous and exothermic and the major mechanism of phosphate adsorption was complexation. The spent adsorbent can be well regenerated using 0.01 mol·L –1 NaOH. The study shows that UiO-66-NH 2 has the potential to remove phosphate from solution.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Xiaoting Zhang,Ruize Zhang,Shanshan Chen,Kang Wen,Runping Han
ABSTRACT In this study, D751 resin (macroporous styrene chelated ion exchange resin, sodium form) was modified by FeCl 3 to enhance the adsorption performance of phosphate from solution. The modified resin (D751-Fe) was characterized by FTIR and XPS, and its adsorption property toward phosphate was presented. The results showed that it was favorable of phosphate adsorption with the increase in the temperature and acidity. The effect of coexisting ions (chloride and sulfate) was insignificant. When the solid–liquid ratio was 1.5 g L –1 , the unit adsorption amount of D751-Fe toward phosphate was to 14.1 mg g –1 (according to P element) with solution pH 3. The adsorption isotherms were well fitted by Langmuir model, Freundlich model, and Koble–Corrigan model while the kinetic curves were well described by pseudo-first-order kinetic model, double constant model, and intraparticle model. There were both physical adsorption and chemical adsorption between D751-Fe and phosphate. It was effective for 0.1 mol·L –1 sodium hydroxide solution as desorbent to regenerate phosphate-loaded adsorbent. It is concluded that that D751-Fe can be used well for the removal of phosphate from solution.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 4
·1-19
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IF 2.9
Gao Zhicheng,Zhang Lei,Shi Xin,Yang Jun,Wang Xunqiu
So far, the purification of dyes wastewater through adsorption and other economical and environmentally friendly methods had received great attention. Therefore, this study mainly discussed the role and rule of PA65 material in wastewater dye treatment. In the experiment, the effects of pH value of solution, initial dye concentration, amount of adsorbent and adsorption time on the removal rate of orange G were studied. It was found that under the conditions of pH < 6, initial dye concentration of about 70 mg·L −1 , amount of adsorbent of about 60 mg, and adsorption time of 120 min, good adsorption performance could be achieved. Under acidic conditions, the PA65 with a pore structure exhibited certain adsorption performance for anionic dyes and had higher selectivity for binary mixed dyes. FITR analysis confirmed the presence of amide groups and amino groups interacting with dye molecules. In addition, the experimental data was fitted by adsorption isotherms and adsorption kinetics model. The results showed that the Langmuir model best describes the equilibrium isotherm data, showing a maximum adsorption capacity of 63.17 mg‧g −1 , and the adsorption data follows the pseudo-second-order dynamics model. The thermodynamic properties revealed that the adsorption process was endothermic and spontaneous.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Jianwei Fu,Zhonghui Chen,Minghuan Wang,Shujun Liu,Jinghui Zhang,Jianan Zhang,Runping Han,Qun Xu
Polydopamine (PDA) microspheres were synthesized by a facile oxidative polymerization method and used as a high-efficiency adsorbent for the removal of a cationic dye (methylene blue, MB) from aqueous solution. Characterizations of the as-synthesized PDA microspheres and PDA microspheres-MB (MB absorbed PDA microspheres) systems were performed using several techniques such as SEM, TEM, FTIR, N 2 adsorption/desorption isotherms, particle size and zeta potential analysis. The effects of initial solution pH, temperature, initial concentration, and contact time were systematically investigated. Results showed the adsorption capacity at 25 °C could reach up to 90.7 mg/g. Besides, adsorption kinetics showed that the adsorption behavior followed the pseudo-second-order kinetic model. The equilibrium adsorption data fitted the Langmuir isotherm well. Thermodynamic analyses showed that the adsorption was endothermic and spontaneous, and it was also a physisorption process. In addition, the possible adsorption mechanism was also proposed based on the experimental results.
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
CHEMOSPHERE
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2017
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IF 4.208
Shengdan Wang,Lingjun Kong,Jianyou Long,Minhua Su,Zenghui Diao,Xiangyang Chang,Diyun Chen,Gang Song,Kaimin Shih
Discharging phosphorus (P)-contaminated water directly into the aquatic environment leads to resource loss and eutrophication . Thus, removing P from waste streams is imperative. In this study, calcium-decorated biochar (Ca-BC) in different mass ratios of Ca to BC was designed to effectively adsorb P from solution. Ca-BC was characterized through X-ray diffraction (XRD) analysis, followed by isotherm and kinetic adsorption experiments. The decorated Ca on the BC surface was found to have preferred P adsorption ability. A design of calcium hydroxide (Ca(OH) 2 ) to flour in a mass ratio of 2:1 was found to have a maximum adsorption capacity of 314.22 mg g −1 for P. The Langmuir and pseudo-second-order models fit the sorption process adequately. XRD analysis indicated that the preferable adsorption ability to P was due to the reaction of Ca(OH) 2 and PO 4 3− , forming the hydroxylapatite (Ca 5 (PO 4 ) 3 (OH)) crystal. The P in solution was transformed to the crystal. Thus, Ca-BC is an environmental friendly and low-cost sorbent for P removal.
研究领域:
环境科学
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水资源管理
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产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
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2015
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IF 2.467
Ya'nan Liu,Chengxing Dong,Hong Wei,Wenhua Yuan,Kebin Li
Antibiotics have been recognized as a class of emerging pollutant. In this study, Fe-pillared montmorillonite (Fe-P-Mt) was prepared and characterized by XRF , XRD , BET, and UV–vis-DRS analyses. Adsorption of levofloxacin (LVX), a fluoroquinolone antimicrobial agent, onto Fe-P-Mt was investigated as a function of contact time, LVX concentration, pH, temperature, and ionic strength by using a batch adsorption method. FT-IR spectroscopy was used to reveal the interaction of LVX and Fe-P-Mt at the molecular level. The obtained results showed that the adsorption of LVX on Fe-P-Mt followed the pseudo-second-order kinetics, and the adsorption isotherms conformed to the Langmuir model with a maxima adsorption capacity of 48.61 mg·g − 1 at 25 °C. The solution pH exerted a strong influence on LVX adsorption. The maximum adsorption was found to occur around pH 7. The addition of NaCl had a minor effect on LVX adsorption, whereas the presence of NaH 2 PO 4 depressed LVX adsorption due to its stronger affinity to Fe species. The thermodynamic parameters indicated that the adsorption process was endothermic and spontaneous. The mean free energies of adsorption calculated from a D–R model, on the other hand, suggested a chemisorption process. FT-IR spectroscopic analysis further revealed that LVX was adsorbed onto Fe-P-Mt via the coordination of ketone and carboxylate functional groups with an Fe atom to form a mononuclear bidentate complex. This study indicates that pillaring montmorillonite with iron species could significantly influence its adsorption behavior and mechanism toward fluoroquinolone antimicrobial agents.
研究领域:
环境科学
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土壤学
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污染治理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Ting Wang,Pan Zhao,Nan Lu,Hongche Chen,Conglu Zhang,Xiaohong Hou
Attractive magnetic metal-organic framework (MOF) material Fe 3 O 4 /MIL-101(Cr) (Matérial Institute Lavoisier, MIL) was synthesized by a simple reduction–precipitation method, and applied as an effective sorbent to the removal of two acid dyes, acid red 1 (AR1) and orange G (OG), in water. The novel synthetic method avoided the oxidation of Fe 2+ and made the Fe 3 O 4 /MIL-101(Cr) composite have the advantages of strong magnetism, large surface areas and excellent dispersion effect. Parameters that influenced the adsorption process, such as solution pH, adsorbent dosage, ionic strength, and so on, were investigated. Under the optimum conditions, adsorption kinetics and isotherms were determined from the obtained experimental data. The adsorption kinetics suggested the adsorption process of Fe 3 O 4 /MIL-101(Cr) toward AR1 and OG met the pseudo-second-order kinetic model. The adsorption isotherms were fitted by Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models. Compared with the Freundlich and D–R models, the Langmuir isotherm model was found to be suitable to describe the equilibrium data, suggesting that the uptake of AR1 and OG by the Fe 3 O 4 /MIL-101(Cr) would be through monolayer adsorption. The thermodynamic results demonstrated that the adsorption was a spontaneous, exothermic and entropy decreased process. In addition, the Zeta potential data with pH value of AR1 and OG indicated that the electrostatic interactions between the dyes and the adsorbent might be critical to the adsorption mechanism. The used Fe 3 O 4 /MIL-101(Cr) could be regenerated by washing with NaOH solution and reused at least six times. The maximum adsorption capacities of the magnetic composite toward AR1 and OG were up to 142.9 mg g −1 and 200.0 mg g −1 , respectively. These results demonstrated that the novel composite would be an effective and easily re-usable adsorbent for AR1 and OG.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Shu Panxiang Chen,Xiaoyu Sun,Xiao Luo,Zhiwu Liang
In this study, Li/Al hydrotalcite (HT) was treated with calcination and potassium hydroxyl-ethanol to form bcHT (basic-modified calcined hydrotalcite). This material was then polyethylenimine (PEI)-functionalized to create a new sorbent that has ultralow energy consumption. Various methods were applied to characterize the sorbent, including N2 adsorption–desorption, Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. CO2 adsorption capacity, which was affected by PEI loadings and adsorption temperatures, was assessed with the CO2 adsorption isotherms and cyclic CO2 adsorption–desorption performance. Results showed that the optimal CO2 adsorption capacity of 1.723 mmol/g was reached when operating with temperature of 323 K and PEI loading of 40%. The Freundlich model was applied to provide optimal correlations with the experimental data, and the correlation coefficients reached 0.997. The average isosteric heat of CO2 adsorption was calculated to be 67.492 kJ/mol. The relatively low desorption energy consumption was calculated to be 63.20 kJ/mol with the Amenomiya equation. Four kinetic models were applied to analyze the kinetics of PEI-functionalized bcHT, and both the Avrami’s fractional order model and DEM model were well fitted to the experimental data. The activation energy of the bcHT-PEI-40% was 30.34 kJ/mol calculated by the Avrami’s fractional order model, which is obviously lower than the values of the CO2 adsorption with traditional amine solution.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Yonghui Tu,Long-Fei Ren,Yuanxin Lin,Jiahui Shao,Yiliang He,Xiaoping Gao,Zhemin Shen
Porous modified polyacrylonitrile (PAN) with an ultrahigh percentage of amidoxime groups (UAPAN) was synthesized for the first time and used to adsorb antimonite (Sb(III)) and antimonate (Sb(V)) from aqueous solution. Fourier transform infrared (FT-IR), Zeta potential , X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) were adopted to characterize UAPAN and explore adsorption mechanism. Moreover, batch experiments were performed to investigate the influence of various adsorption parameters, including initial pH, contact time, temperature, coexisting ions and reusability on adsorption capacities. Results showed that the maximum adsorption capacities for Sb(III) and Sb(V) were 125.4 and 177.3 mg g −1 , respectively, which were much higher than those of other adsorbents reported in literature. The adsorption thermodynamics was evaluated, indicating the spontaneous and endothermic adsorption. The adsorption isotherm was suitable to be modeled by Langmuir isotherm ( R 2 > 0.96). Results of FT-IR, Zeta potential and XPS indicated that adsorption was involved with electric charge attraction and ligand exchange. DFT further explained that better adsorption of Sb(V) on UAPAN than that of Sb(III) was caused by the higher adsorption energy, more favorable bond lengths and atom charge density. Accordingly, UAPAN is expected to be a compelling candidate for antimony decontamination from aqueous environment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2012
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IF 3.461
Pingxiao Wu,Yaping Dai,Hang Long,Nengwu Zhu,Ping Li,Jinhua Wu,Zhi Dang
Organo-montmorillonites (organo-Mts) were prepared by grafting with 3-aminopropyl triethoxysilane (APTES), and surface modification which was composed of hexadecyl trimethyl ammonium bromide (HDTMAB) and sodium dodecyl sulfate (SDS) solutions. XRD, BET, FTIR, SEM and Zeta potential analysis were used to characterize the surface and structure properties of the as-obtained products. The XRD and FTIR results showed that APTES was successfully grafted to calcium-saturated montmorillonite (Ca-Mt) and the BET data illustrated that the surface area and microporous volume decreased largely after modification, while the pore diameter increased. Moreover, batch experiments were conducted to investigate the adsorption behavior of Sr(II) on organo-Mts. The experimental results showed that the adsorption capacity of APTES-Mt was 65.6 mg/g, much larger than those of Ca-Mt, SDS-Mt and HDTMAB-Mt (13.23 mg/g, 26.85 mg/g and 3.91 mg/g, respectively) under the chosen conditions. Pseudo-second-order model fitted well with the adsorption kinetic studies for all materials with an equilibrium time of 24 h. Further, the isotherm adsorption could be described well with both Langmuir and DKR models for SDS-Mt, Freundlich model for Ca-Mt and APTES-Mt as well. The Sr(II) removal by Ca-Mt was mainly ion exchange, nevertheless, that by SDS-Mt and APTES-Mt were surface adsorption and ligand adsorption, respectively.
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
危险品化学品经营许可证（带存储）