Preparation and Pb2+/Cd2+ adsorption of encapsulated Fe3O4/sodium polyacrylate magnetic crosslinking polymer

HE Shengfu; ZHANG Fan; CHENG Shenzhen; WANG Wei

doi:10.11949/j.issn.0438-1157.20160259

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Preparation and Pb²⁺/Cd²⁺ adsorption of encapsulated Fe₃O₄/sodium polyacrylate magnetic crosslinking polymer

更新时间：2025-11-26

- Preparation and Pb²⁺/Cd²⁺ adsorption of encapsulated Fe₃O₄/sodium polyacrylate magnetic crosslinking polymer
- CIESC Journal Vol. 67, Issue 10, Pages: 4290-4299(2016)
- 作者机构：
  
  吉首大学化学化工学院, 湖南省锰锌钒产业技术2011协同中心, 矿物清洁生产与绿色功能材料开发湖南省重点实验室, 湖南吉首,416000
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160259
  CLC： Q028.3
- Online First：05 October 2016，
  
  Published：05 October 2016
- 稿件说明：
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HE Shengfu, ZHANG Fan, CHENG Shenzhen, et al. Preparation and Pb²⁺/Cd²⁺ adsorption of encapsulated Fe₃O₄/sodium polyacrylate magnetic crosslinking polymer[J]. CIESC Journal, 2016, 67(10): 4290-4299. DOI: 10.11949/j.issn.0438-1157.20160259.
DOI：

HE Shengfu, ZHANG Fan, CHENG Shenzhen, et al. Preparation and Pb²⁺/Cd²⁺ adsorption of encapsulated Fe₃O₄/sodium polyacrylate magnetic crosslinking polymer[J]. CIESC Journal, 2016, 67(10): 4290-4299. DOI: 10.11949/j.issn.0438-1157.20160259. DOI：

摘要

采用溶液分散聚合和Ca2+表面交联制备了聚丙烯酸钠包覆Fe3O4的磁性交联聚合物（CPAANa@Fe3O4），对其进行了XRD、FT-IR、SEM和TGA等表征。以CPAANa@Fe3O4为吸附剂研究了CPAANa@Fe3O4对水溶液中Pb2+、Cd2+的静态吸附，考察了溶液pH、吸附剂投加量、金属离子初始浓度对吸附的影响。结果表明：CPAANa@Fe3O4在pH 2～6范围内均具有较好的吸附性能，当吸附剂投加量分别为1.0 g·L-1和1.6 g·L-1时对初始浓度分别为200 mg·L-1的Pb2+和100 mg·L-1的Cd2+的去除率达到最大，可使Pb2+实现达标排放（GB 8978-1996）；CPAANa@Fe3O4对Pb2+和Cd2+的吸附动力学符合准二级模型，吸附等温线符合Langmuir模型，对Pb2+和Cd2+的最大吸附量分别为454.55 mg·g-1和275.48 mg·g-1。将CPAANa@Fe3O4用于处理实际电解矿浆废水，发现能有效吸附其中的Pb2+和Cd2+，具有潜在实用价值。

Abstract

A magnetic crosslinking polymer

Fe3O4 encapsulated by sodium polyacrylate (CPAANa@Fe3O4)

was prepared via dispersed solution polymerization followed by Ca2+ surface-crosslinking and characterized by techniques of XRD

FT-IR

SEM and TGA. Static adsorption of Pb2+ and Cd2+ ions to the polymer in aqueous solutions was investigated by varying solution pH

polymer adsorbent dosage

and initial concentration of heavy metal ions. The CPAANa@Fe3O4 magnetic crosslinking polymer showed good adsorption performance in solutions with pH in the range of 2-6. The maximum adsorptions for Pb2+ and Cd2+ were observed at adsorbent dosage of 1.0 and 1.6 g·L-1 for initial Pb2+ concentration of 200 mg·L-1 and initial Cd2+ concentration of 100 mg·L-1

respectively

such that the residual Pb2+ concentration could meet the standard for discharge (GB 8978-1996). The adsorption kinetics of both Pb2+ and Cd2+ on CPAANa@Fe3O4 polymer followed pseudo-second order model and their adsorption isotherms obeyed the Langmuir model. Maximum adsorption capacities of the polymer for Pb2+ and Cd2+ were 454.55 and 275.48 mg·g-1

respectively. The CPAANa@Fe3O4 polymer effectively removed Pb2+ and Cd2+ from complex electrolytic pulp wastewater

indicating its potential application advantages as an efficient adsorbent.

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