Polymers
·
2018
·Vol. 10
·期 10
·1090
·
IF 2.935
Jiling Zhao,Shixing Wang,Libo Zhang,Chen Wang,Bing Zhang
Industrial wastewater contains large amounts of silver ions. Here, a new adsorbent was synthesized by functionalizing poly(glycidyl methacrylate) with carboxymethyl groups. The adsorbent was used to recover Ag(I) in wastewater. Fourier transform infrared spectroscopy, zeta potential, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the adsorbent. The experimental parameters affecting the adsorption are solution pH, contact time, and initial silver ion concentration. The optimum pH for adsorption of Ag(I) is pH 4. The maximum adsorption capacity at pH 4 is 157.05 mg/g, and the adsorption reaches equilibrium at 300 min. The kinetics and isotherms of the adsorption process were described by pseudo second-order, Langmuir and D-R models, respectively. The adsorption process was a single layer chemical adsorption, exothermic, feasible, and spontaneous. The adsorption mechanism is electrostatic or chelation. The adsorbent selectively absorbed Ag(I) from coexisting ions (Cu2+, Ni2+, Co2+, Zn2+). Finally, the removal rate of silver ions decreased from 79.29% to 65.01% after four repetitive experiments, which proved that the adsorbent had good reusability. The adsorbent has great potential benefit in removing Ag(I).Keywords:polymer;Ag (I), removal;mechanism;adsorption
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Wenjuan Zhang,Yuheng Li,Yaxian Wang,Youliang Wang,Miao Kou,Xiangyue Yang,Qianqian Chu,Kun Zhao
An efficient route is proposed to synthesize a novel three-dimensional (3D) magnetic MXene aerogel (3D MXene/Fe 3 O 4 ). 3D MXene were synthesized by self-assembly of 2D MXene Ti 3 C 2 T x using ethylenediamine (EDA) as crosslinking inducer, then Fe 3 O 4 was in situ coprecipitation onto 3D MXene. 3D MXene/Fe 3 O 4 was applied as an adsorbent for Ag(I) removal from aqueous solutions. 3D MXene/Fe 3 O 4 exhibits a cross-linked 3D porous network with magnetic Fe 3 O 4 nanoparticles uniformly dispersed on its surface and edges. The maximum adsorption capacity of 3D MXene/Fe 3 O 4 for Ag(I) was 2385 mg g −1 . The kinetics and isothermal process during adsorption were described accurately by the pseudo-second-order model and the Freundlich isotherm model, and the adsorption process was driven by chemisorption and multilayer adsorption, where the diffusion mechanism involved surface diffusion and intraparticle diffusion. Furthermore, the 3D MXene/Fe 3 O 4 are recyclable, retaining 71% of the initial removal rate after 5 adsorption/desorption cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 51
·期 2
·340-346
·
IF 3.919
Delong Liu,Hou Chen,Naiyi Ji,Zhi Tan
In this study, we reported the synthesis of polyacrylonitrile (PAN) via living radical polymerization in N, N -dimethylformamide using carbon tetrachloride as initiator, copper(II) chloride (CuCl 2 )/hexamethylenetetramine as catalyst system, and 2,2-azobisisobutyronitrile as a high concentration of thermal radical initiator. The polymerization proceeded in controlled/living manner as indicated by first-order kinetics of the polymerization with respect to the monomer concentration, linear increase of the molecular weight with monomer conversion and narrow polydispersity. Higher polymerization rate and narrower molecular weight distributions were observed with CuCl 2 less than 50 ppm. The rate of polymerization showed a trend of increase along with temperature. The modified PAN containing amidoxime group was used for extraction of Ag(I) ions from aqueous solutions. The adsorption kinetics data indicated that the adsorption process followed pseudo-second-order rate model. The isotherm adsorption process could be described by the Freundlich isotherm model. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
研究领域:
高分子化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Song Deng,Jingrong Huang,Meng Guo,Xueni Sun,Xiuxiu Ren,Jing Zhong,Rong Xu
Novel p-phenylenediamine-bridged organosilica (PPDA-BOS-T) materials were synthesized via the co-condensation reaction assisted by tetraethyl orthosilicate (TEOS). These amino-functionalized organosilicas were characterized by Fourier transform infrared spectrometer, N 2 sorption, scanning electron microscopy, and transmission electron microscopy. The addition of TEOS played a positive role in the construction of the porous network structure of the bridged organosilicas. The saturation adsorption capacity for Ag(I) of the PPDA-BOS-T could reach 82.88 mg g –1 . The conformity to the Freundlich model indicated multilayer adsorption with active sites. Furthermore, the adsorption was followed well by the pseudo-second-order model, and the intraparticle diffusion was proved to be the rate-limiting step during the adsorption of Ag(I). Finally, the thermodynamic parameters including the change of free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) of adsorption were calculated.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
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