添加H2O2改性和HNO3/H2SO4改性生物质炭对一种酸性水稻土吸附Cd (Ⅱ)的影响
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

S156.2

基金项目:

国家自然科学基金项目(41877036)资助。


Effects of H2O2 and HNO3/H2SO4 Modified Biochars on Adsorption of Cd(II) by an Acidic Paddy Soil
Author:
Affiliation:

Fund Project:

National Natural Science Foundation of China

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    选择稻草、玉米秸秆和油菜秸秆作为制备生物质炭的原料,分别用H2O2和HNO3/H2SO4对生物质炭进行改性处理,以未改性的生物质炭和HCl处理的生物质炭作为对照。按土重3%的比例向采自安徽郎溪的酸性水稻土中添加上述生物质炭,在经历一个干湿交替周期后,进行Cd (Ⅱ)吸附/解吸试验,研究添加生物质炭对水稻土吸附Cd (Ⅱ)的影响及其机制。结果表明,两种改性方法均有效增加了生物质炭表面的质子结合位点数,且HNO3/H2SO4改性对生物质炭表面羧基官能团的扩增效果更显著。官能团的增加使得添加了HNO3/H2SO4改性生物质炭的水稻土对Cd (Ⅱ)的专性吸附能力显著增强。因此,添加HNO3/H2SO4改性生物质炭可作为酸性水稻土吸附固定重金属Cd的一种新型方法。

    Abstract:

    The straws of rice, maize and rape were selected as raw materials for preparing biochars. The biochars were modified with H2O2 and HNO3/H2SO4, respectively, and the unmodified biochar and HCl treated biochar were used as control. The above biochars were added to an acidic paddy soil from Langxi, Anhui Province at the rate of 3%. The mixed soil samples were submerged for one month at 25℃, and then dried naturally. After a wet/dry cycle, Cd(II) adsorption/desorption experiments were carried out. Results indicate that the modifications of H2O2 and HNO3/H2SO4 increase the number of proton binding sites on biochars and HNO3/H2SO4modification leads to greater increase in the number of proton binding sites due to the greater increase of carboxyl functional groups than H2O2 modification. The addition of modified biochars improve the adsorption capacity of the acidic paddy soil for Cd(II), especially the addition of HNO3/H2SO4modified biochar. Therefore, adding HNO3/H2SO4 modified biochar could be used as a new method for adsorption and immobilization of Cd in acidic paddy soils.

    参考文献
    相似文献
    引证文献
引用本文

何娴,徐仁扣.添加H2O2改性和HNO3/H2SO4改性生物质炭对一种酸性水稻土吸附Cd (Ⅱ)的影响[J].土壤,2022,54(5):1016-1023. HE Xian, XU Renkou. Effects of H2O2 and HNO3/H2SO4 Modified Biochars on Adsorption of Cd(II) by an Acidic Paddy Soil[J]. Soils,2022,54(5):1016-1023

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2022-01-05
  • 最后修改日期:2022-03-02
  • 录用日期:2022-03-09
  • 在线发布日期: 2022-10-31
  • 出版日期: