Attapulgite(APT) has been frequently used for the adsorptive removal of dyes from aqueous solution owing to its unique one-dimensional nanoscale structure and low-cost, abundant,eco-friendly advantages. In this work...Attapulgite(APT) has been frequently used for the adsorptive removal of dyes from aqueous solution owing to its unique one-dimensional nanoscale structure and low-cost, abundant,eco-friendly advantages. In this work, APT was functionalized under mild hydrothermal condition using chloroacetic acid(CA) with /COOH functional groups to improve its adsorption properties. The effect of hydrothermal modification on the microstructure and physicochemical features of APT was investigated by Fourier transform infrared spectroscopy, X-ray diffraction and Field-emission scanning electron microscopy analyses. The effects of hydrothermal reaction parameters on the adsorption properties of modified APT were intensively investigated. It was revealed that the rearrangement of crystal structure and the surface functionalization of APT with /COOH groups cause the surprising increase of adsorption capability for Methylene Blue(MB). The removal ratio of raw APT for MB is only 59.52%, while modified APT could almost completely remove MB in the 200 mg/L of MB solution with a removal ratio of 99.8%. The adsorption kinetics fitted pseudo second-order kinetic model, and the adsorption isotherm could be described with Langmuir isotherm model very well. The hydrogen-bonding interaction, electrostatic attraction and chemical association are the main driving force for the adsorption process.展开更多
Kapok fiber corresponds to the seed hairs of the kapok tree(Ceiba pentandra), and is a typical cellulosic fiber with the features of thin cell wall, large lumen, low density and hydrophobic–oleophilic properties. A...Kapok fiber corresponds to the seed hairs of the kapok tree(Ceiba pentandra), and is a typical cellulosic fiber with the features of thin cell wall, large lumen, low density and hydrophobic–oleophilic properties. As a type of renewable natural plant fiber, kapok fiber is abundant,biocompatible and biodegradable, and its full exploration and potential application have received increasing attention in both academic and industrial fields. Based on the structure and properties of kapok fiber, this review provides a summary of recent research on kapok fiber including chemical and physical treatments, kapok fiber-based composite materials, and the application of kapok fiber as an absorbent material for oils, metal ions, dyes, and sound,with special attention to its use as an oil-absorbing material, one predominant application of kapok fiber in the coming future.展开更多
A series of mesoporous silicate adsorbents with superior adsorption performance for hazardous chlortetracycline(CTC) were sucessfully prepared via a facile one-pot hydrothermal reaction using low-cost illite/smectit...A series of mesoporous silicate adsorbents with superior adsorption performance for hazardous chlortetracycline(CTC) were sucessfully prepared via a facile one-pot hydrothermal reaction using low-cost illite/smectite(IS) clay,sodium silicate and magnesium sulfate as the starting materials.In this process,IS clay was "teared up" and then "rebuilt" as new porous silicate adsorbent with high specific surface area of 363.52 m^2/g(about 8.7 folds higher than that of IS clay) and very negative Zeta potential(- 34.5 mV).The inert Si- O- Si(Mg,Al) bonds in crystal framework of IS were broken to form Si(Al)- O^- groups with good adsorption activity,which greatly increased the adsorption sites served for holding much CTC molecules.Systematic evaluation on adsorption properties reveals the optimal silicate adsorbent can adsorb 408.81 mg/g of CTC(only 159.7 mg/g for raw IS clay) and remove 99.3%(only 46.5%for raw IS clay) of CTC from 100 mg/L initial solution(pH 3.51;adsorption temperature 30℃;adsorbent dosage,3 g/L).The adsorption behaviors of CTC onto the adsorbent follows the Langmuir isotherm model,Temkin equation and pseudo second-order kinetic model.The mesopore adsorption,electrostatic attraction and chemical association mainly contribute to the enhanced adsorption properties.As a whole,the high-efficient silicate adsorbent could be candidates to remove CTC from the wastewater with high amounts of CTC.展开更多
基金supported by the Hi-Tech research and Development Program (863) of China (No. 2013AA032003)the West Light Foundation of the Chinese Academy of Sciences (the Science Development Talent Teach words [2012] No. 179)
文摘Attapulgite(APT) has been frequently used for the adsorptive removal of dyes from aqueous solution owing to its unique one-dimensional nanoscale structure and low-cost, abundant,eco-friendly advantages. In this work, APT was functionalized under mild hydrothermal condition using chloroacetic acid(CA) with /COOH functional groups to improve its adsorption properties. The effect of hydrothermal modification on the microstructure and physicochemical features of APT was investigated by Fourier transform infrared spectroscopy, X-ray diffraction and Field-emission scanning electron microscopy analyses. The effects of hydrothermal reaction parameters on the adsorption properties of modified APT were intensively investigated. It was revealed that the rearrangement of crystal structure and the surface functionalization of APT with /COOH groups cause the surprising increase of adsorption capability for Methylene Blue(MB). The removal ratio of raw APT for MB is only 59.52%, while modified APT could almost completely remove MB in the 200 mg/L of MB solution with a removal ratio of 99.8%. The adsorption kinetics fitted pseudo second-order kinetic model, and the adsorption isotherm could be described with Langmuir isotherm model very well. The hydrogen-bonding interaction, electrostatic attraction and chemical association are the main driving force for the adsorption process.
基金supported by the National Natural Science Foundation of China (Nos. 21107116, 21477135)
文摘Kapok fiber corresponds to the seed hairs of the kapok tree(Ceiba pentandra), and is a typical cellulosic fiber with the features of thin cell wall, large lumen, low density and hydrophobic–oleophilic properties. As a type of renewable natural plant fiber, kapok fiber is abundant,biocompatible and biodegradable, and its full exploration and potential application have received increasing attention in both academic and industrial fields. Based on the structure and properties of kapok fiber, this review provides a summary of recent research on kapok fiber including chemical and physical treatments, kapok fiber-based composite materials, and the application of kapok fiber as an absorbent material for oils, metal ions, dyes, and sound,with special attention to its use as an oil-absorbing material, one predominant application of kapok fiber in the coming future.
基金the National Natural Science Foundation of China(Nos.51403221 and 21377135)the Jiangsu Provincial Joint Innovation and Research Funding of Enterprises,Colleges and Institutes(No.BY2015056-01)+1 种基金the Huai'an Cooperative Research Project of the Enterprises,Colleges and Institutes(No.HAC2015005)the Youth Innovation Promotion Association CAS(No.2016370)for financial support of this research
文摘A series of mesoporous silicate adsorbents with superior adsorption performance for hazardous chlortetracycline(CTC) were sucessfully prepared via a facile one-pot hydrothermal reaction using low-cost illite/smectite(IS) clay,sodium silicate and magnesium sulfate as the starting materials.In this process,IS clay was "teared up" and then "rebuilt" as new porous silicate adsorbent with high specific surface area of 363.52 m^2/g(about 8.7 folds higher than that of IS clay) and very negative Zeta potential(- 34.5 mV).The inert Si- O- Si(Mg,Al) bonds in crystal framework of IS were broken to form Si(Al)- O^- groups with good adsorption activity,which greatly increased the adsorption sites served for holding much CTC molecules.Systematic evaluation on adsorption properties reveals the optimal silicate adsorbent can adsorb 408.81 mg/g of CTC(only 159.7 mg/g for raw IS clay) and remove 99.3%(only 46.5%for raw IS clay) of CTC from 100 mg/L initial solution(pH 3.51;adsorption temperature 30℃;adsorbent dosage,3 g/L).The adsorption behaviors of CTC onto the adsorbent follows the Langmuir isotherm model,Temkin equation and pseudo second-order kinetic model.The mesopore adsorption,electrostatic attraction and chemical association mainly contribute to the enhanced adsorption properties.As a whole,the high-efficient silicate adsorbent could be candidates to remove CTC from the wastewater with high amounts of CTC.
基金the financial support from the National Natural Science Foundation of China(No.51003111)"Western Light"Talents Training Program of CAS+1 种基金the Natural Science Foundation of Gansu Province(No.1107RJYA051) the Solar Action Plan of CAS(No.1731012394)