Adsorption behavior of modified rice straw to thorium

WU Wanying; YAO Guangchao; ZHANG Xiaowen; CHEN Zhumei; ZHANG Xiaofeng; CHEN Diyun

doi:10.11889/j.0253-3219.2015.hjs.38.040301

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Adsorption behavior of modified rice straw to thorium

更新时间：2021-03-03

- Adsorption behavior of modified rice straw to thorium
- NUCLEAR TECHNIQUES Vol. 38, Issue 4, Article number: 040301(2015)
- 作者机构：
  
  1. 广州大学环境科学与工程学院,广州,510006
  2. 广东省放射性核素污染控制与资源化重点实验室,广州,510006
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.040301
  CLC：
- Published：09 April 2015
- 稿件说明：
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WU Wanying, YAO Guangchao, ZHANG Xiaowen, et al. Adsorption behavior of modified rice straw to thorium[J]. Nuclear techniques, 2015, 38(4): 040301
DOI：

WU Wanying, YAO Guangchao, ZHANG Xiaowen, et al. Adsorption behavior of modified rice straw to thorium[J]. Nuclear techniques, 2015, 38(4): 040301 DOI： 10.11889/j.0253-3219.2015.hjs.38.040301.

摘要

采用丁二酸对稻草进行改性处理，系统研究了不同稻草添加量、pH值、吸附时间和吸附温度条件下，丁二酸改性稻草对水溶液中Th4+的吸附效果。结果表明当吸附剂投加量为0.50 g、pH=3.5、反应时间为30 min、钍溶液初始浓度为10 mg?L?1、温度为65 oC时，改性稻草对Th4+的吸附效果最好，去除率可达96%。傅里叶变换红外光谱分析揭示改性后的稻草样品添加了羧基、羟基、酯基的吸收峰。改性稻草的吸附行为符合Freundlich等温吸附模型以及准二级动力学方程，其吸附性能的提高，认为是改性处理暴露了更多的木质素、纤维素内部多孔结构，及增加了木质素、纤维素上的特殊基团。

Abstract

Background: Agricultural wastes are widely applied in heavy metal wastewater treatment

and became a hot point in this field. Purpose: The aim is to study modified rice straw with significant removal ability of thorium. Methods: The rice straw modified with butanedioic acid was used to remove Th4+ from aqueous solution. And its influence factors such as adsorbent dosage

adsorption time and reaction temperature were investigated through dynamic tests. Results: The optimal conditions were found to be 0.50 g of modified rice straw

pH=3.5

0.5 h of adsorption time and 10 mg?L?1 of initial thorium concentration at 65 oC. Under these conditions

the removal rates reach 96%. Fourier transform infrared spectroscopy (FTIR) analysis shows some new adsorption peaks such as carboxyl

ester and hydroxyl has added to modified rice straw. The adsorption behavior of Th4+ could be fitted well by the Freundlich adsorption isotherms and the quasi-second order kinetics equation. Conclusion: Its absorptive property enhancement might attribute to expose more internal porous structure of lignin and cellulose and add special functional groups by the modifying process.Cited

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