Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (4): 40301-040301.doi: 10.11889/j.0253-3219.2015.hjs.38.040301

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Adsorption behavior of modified rice straw to thorium

WU Wanying1 YAO Guangchao1 ZHANG Xiaowen1 CHEN Zhumei1 ZHANG Xiaofeng1,2 CHEN Diyun1,2   

  1. 1(Environmental Science and Engineering Department of Guangzhou University, Guangzhou 510006, China) 2(Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou 510006, China)
  • Received:2014-10-30 Revised:2014-12-21 Online:2015-04-10 Published:2015-04-09

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, pH, 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.

Key words: Thorium, Butanedioic acid, Modified rice straw, Adsorption