文献类型： 外文期刊
作者： Qiu, Cheng 1 ; Wang, Chengwei 2 ; Liu, Qinghai 1 ; Gao, Minling 2 ; Song, Zhengguo 2 ;
作者机构： 1.Tibet Acad Agr & Anim Husb Sci, Inst Agr Prod Qual Stand & Testing Res, Lhasa 850032, Peoples R China
2.Shantou Univ, Dept Civil & Environm Engn, 243 Daxue Rd, Shantou 515063, Peoples R China
3.Tiangong Univ, Sch Environm Sci & Engn, 399 Binshui West Rd, Tianjin 300387, Peoples R China
4.Shantou Univ, Guangdong Prov Key Lab Marine Disaster Predict & P, Shantou 515063, Peoples R China
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.
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