A Gel Resin-supported Nano-hydrated Iron Oxide for Arsenate Sorption from Water

Yan Liu; Yang Gao; Xin Zhao; Chao Shan; Xiao-lin Zhang; Bing-cai Pan

doi:10.11777/j.issn1000-3304.2018.18056

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A Gel Resin-supported Nano-hydrated Iron Oxide for Arsenate Sorption from Water

Research Article | 更新时间：2021-01-26

- A Gel Resin-supported Nano-hydrated Iron Oxide for Arsenate Sorption from Water
- Acta Polymerica Sinica Vol. 0, Issue 7, Pages: 939-948(2018)
- 作者机构：
  
  污染控制与资源化研究国家重点实验室南京大学环境学院　南京 210023
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18056
  CLC：
- Published：2018-7，
  
  Received：10 February 2018，
  
  Revised：26 March 2018，
扫描看全文
Yan Liu, Yang Gao, Xin Zhao, Chao Shan, Xiao-lin Zhang, Bing-cai Pan. A Gel Resin-supported Nano-hydrated Iron Oxide for Arsenate Sorption from Water. [J]. Acta Polymerica Sinica 0(7):939-948(2018)
DOI：

Yan Liu, Yang Gao, Xin Zhao, Chao Shan, Xiao-lin Zhang, Bing-cai Pan. A Gel Resin-supported Nano-hydrated Iron Oxide for Arsenate Sorption from Water. [J]. Acta Polymerica Sinica 0(7):939-948(2018) DOI： 10.11777/j.issn1000-3304.2018.18056.

摘要

以凝胶型离子交换树脂(201 × 4)为基体制备出负载水合氧化铁的纳米复合材料HFO-201 × 4，发现出现了明显的物理孔结构，机械强度显著提升；且纳米颗粒主要为针状，可利用活性位点密度相比大孔型复合材料提高了约67%；对低浓度As(V)的吸附容量与吸附速率均显著高于大孔型复合材料，对模拟As(V)污染水的处理容量显著提高至大孔型复合材料的2倍左右，并可实现稳定循环再生.

Abstract

Nano-scale hydrated ferric oxide (HFO) of high specific surface area and reactivity exhibits specific affinity toward arsenate owing to the abundant surface hydroxyl groups. Nevertheless

the ultrafine particle of nano-HFO tend to agglomerate and thereafter significantly limits its large-scale application in water treatment due to the excessive hydraulic pressure drop and difficult operation from the reaction systems. In comparison with macroporous ion exchangers

gel-type ones are more cost effective

though their utilization as hosts to support nanoparticles is intensively compromised by relatively poor pore structure

high swelling rate and weak mechanical strength. In this study we prepared a nanocomposite adsorbent HFO-201 × 4

via

ion exchange/

in situ

deposition method by using a gel resin-201 × 4 as the host of nano-HFO. The main objective of this study is to compare the structural features

physical and chemical properties of the nanocomposite to a macroporous resin-based nanocomposite HFO-201

and to evaluate their different adsorption property toward As(V). The results indicate that nano-HFO immobilized in HFO-201 × 4 was acicular

quite different from the spherical particles in HFO-201. Other structure properties of both composites

such as crystal form

pore structure

mechanical strength and swelling ratio

are quite similar. The maximum adsorption capacity of HFO-201 × 4 was slightly higher than that of HFO-201

while HFO-201 × 4 exhibited superior adsorption toward trace As(V) over HFO-201 in terms of adsorption capacity and kinetics

possibly arising from higher site density of HFO-201 × 4 (1.47 mmol/g) than HFO-201 (0.88 mmol/g). From the breakthrough curves of two separate fixed beds packed with both composites

the effective working capacity of HFO-201 × 4 was nearly twice of HFO-201. The exhausted HFO-201 × 4 could be efficiently regenerated for cyclic runs. This study demonstrates that gel-type anion exchange resins could serve as promising hosts for fabrication of similar nanocomposite for water decontamination.

关键词

凝胶型离子交换树脂水合氧化铁纳米复合材料五价砷选择性吸附

Keywords

Gel anion exchangerHydrated ferric oxideArsenateNanocompositeSelective adsorption

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