Effective Removal of Cd from Aqueous Solutions Using P-Loaded Ca-Mn-Impregnated Biochar

文献类型： 外文期刊

第一作者： Qiu, Cheng

作者： Qiu, Cheng;Liu, Qinghai;Wang, Chengwei;Gao, Minling;Song, Zhengguo;Wang, Chengwei;Song, Zhengguo

作者机构：

关键词： phosphate-loaded Ca-Mn-impregnated biochar; adsorption; cadmium; mechanism; aqueous solutions

期刊名称：MOLECULES （ 影响因子：4.6； 五年影响因子：4.9 ）

ISSN：

年卷期： 2023 年 28 卷 22 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) pollution in wastewater has become an increasingly widespread concern worldwide. Studies on Cd (II) removal using phosphate-adsorbed sorbents are limited. This study aimed to elucidate the behaviors and mechanisms of Cd (II) sorption on phosphate-loaded Ca-Mn-impregnated biochar (Ps-CMBC). The Cd (II) sorption on Ps-CMBC reached equilibrium within 2 h and exhibited a higher sorption efficiency than biochar and CMBC. Additionally, the Langmuir isotherm could better describe the Cd (II) adsorption on the sorbents. P75-CMBC had a maximum Cd (II) sorption capability of 70.13 mg center dot g-1 when fitted by the Langmuir isotherm model, which was approximately 3.18 and 2.86 times greater than those of biochar and CMBC, respectively. Higher pH (5-7) had minimal effect on Cd (II) sorption capacity. The results of characterization analyses, such as SEM-EDS, FTIR, and XPS, suggested that there was a considerable difference in the sorption mechanisms of Cd (II) among the sorbents. The primary sorption mechanisms for biochar, CMBC, and Ps-CMBC included electrostatic attraction and surface complexation; additionally, for Ps-CMBC, Cd (II)-pi interactions and coordination of Cd (II) with P=O were critical mechanisms for Cd (II) removal. The results of this study demonstrate that phosphate-loaded CMBC can be used as an effective treatment for heavy metal pollution in aqueous media.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序