Formation of framework supported pore for PVA/ZnO composite and Pb(Ⅱ) adsorption

Sheng XU; Lingli LIU; Meng CAO; Shangxi ZHANG; Xin DAI; Yang LIU; Zhenxi WANG

doi:10.11949/j.issn.0438-1157.20181339

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Formation of framework supported pore for PVA/ZnO composite and Pb(Ⅱ) adsorption

更新时间：2020-06-24

- Formation of framework supported pore for PVA/ZnO composite and Pb(Ⅱ) adsorption
- CIESC Journal Issue S1, Pages: 130-140(2019)
- 作者机构：
  
  南昌工程学院理学院, 江西南昌 330099
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181339
  CLC： X 131
- Received：15 November 2018，
  
  Revised：2018-12-25，
- 稿件说明：
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徐胜, 刘玲利, 曹锰, 张尚玺, 戴欣, 柳阳, 王振希. PVA/ZnO复合材料“骨架支撑”型孔道构建及铅离子吸附[J]. 化工学报, 2019, 70(S1): 130-140

XU Sheng, LIU Lingli, CAO Meng, ZHANG Shangxi, DAI Xin, LIU Yang, WANG Zhenxi. Formation of framework supported pore for PVA/ZnO composite and Pb(Ⅱ) adsorption[J]. CIESC Journal, 2019, 70(S1): 130-140
徐胜, 刘玲利, 曹锰, 张尚玺, 戴欣, 柳阳, 王振希. PVA/ZnO复合材料“骨架支撑”型孔道构建及铅离子吸附[J]. 化工学报, 2019, 70(S1): 130-140 DOI： 10.11949/j.issn.0438-1157.20181339.

XU Sheng, LIU Lingli, CAO Meng, ZHANG Shangxi, DAI Xin, LIU Yang, WANG Zhenxi. Formation of framework supported pore for PVA/ZnO composite and Pb(Ⅱ) adsorption[J]. CIESC Journal, 2019, 70(S1): 130-140 DOI： 10.11949/j.issn.0438-1157.20181339.

摘要

通过原位共交联方法制备了多孔型PVA/tetra-ZnO(聚乙烯醇/四针状氧化锌)复合材料作为废水中Pb(II)的脱除吸附剂，研究发现，由于tetra-ZnO四条晶须臂具有互锁特性使其孔壁处形成了“骨架支撑”型孔道结构，从而有利于Pb(II)的传输扩散和吸附络合。复合材料在tetra-ZnO含量为7%时具有最大Pb(II)吸附量，随pH增大，吸附量逐渐增大，复合材料的吸附效应在pH为4.0左右时最为明显。与复合材料的孔径分布相反，吸附的Pb(II)在复合材料中由外至内呈逐渐递减的梯度分布。等温吸附线表明Langmuir模型具有更好的拟合性，其吸附机理为单分子层均质吸附。动力学过程拟合表明其吸附分多步进行，化学吸附和内扩散均具有重要作用。与纯PVA相比，复合材料的应力吸附稳定性和热稳定性得到大幅提高。

Abstract

PVA/tetra-ZnO composite was prepared by

situ

chemical crosslinking reaction which was used as the absorbent of Pb(II) in waste water. The FTIR and TGA results indicated the successful grafting of APTES on the tetra-ZnO particles surface and the tetra-ZnO particles dispersed uniformly after modification. A special “framework supported” structure was formed around the pore-channel wall of PVA/tetra-ZnO composite due to the interlocking characteristic of the tetra-ZnO particle s four whisker arms and which was beneficial for the diffusion and adsorption of heavy metal ions solution. The Pb(II) adsorption capacity reached to the maximum at 7% tetra-ZnO content

and the adsorption effect was most significant at pH 4.0. Contrary to the distribution of pore size

the absorbed Pb(II) on PVA/tetra-ZnO composite was graded distribution from the out to inside with a gradual decease trend. The Langmuir model was better fitted the Pb(II) adsorption isotherm process which revealed the homogeneous monolayer adsorption mechanism. The adsorption kinetics indicated the stepwise adsorption process due to the perfect fitting degree of pseudo-first-order model as well the pseudo-first-order model. The intraparticle diffusion kinetics model indicated that the chemical adsorption and intraparticle diffusion played the important role during the whole adsorption process. Besides

the stress stability and thermo stability of PVA/tetra-ZnO composites were improved than neat PVA.

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