期刊论文

Adsorption effect of cadmium and arsenic by magnetic biochar

Tang, D.-S.

中文

现代化工

0253-4320

2020

40

7

160-165

10.16606/j.cnki.issn0253-4320.2020.07.034

南华大学双一流建设项目（2017SYL05）； 衡阳市土壤污染控制与修复重点实验室项目（2018HPT06）；

本校为第一且通讯机构

用Fe_3O_4对谷壳生物炭进行改性得到磁性生物炭。利用SEM、XRD对磁性生物炭进行表征,并通过响应面优化和共吸附实验探究该生物炭在共吸附系统中对As~(3+)和Cd~(2+)的吸附性能。结果表明,在pH为5.0、镉(砷)初始质量浓度分别为10 mg/L、吸附剂质量浓度为1 g/L时,镉和砷去除率达到最大。在共吸附实验中,As~(3+)和Cd~(2+)共存时,Cd~(2+)质量浓度大于20 mg/L时会抑制生物炭对As~(3+)的吸附,10 mg/L As~(3+)与生物炭达到平衡后可以使50 mg/L Cd~(2+)的吸附量由17.44 mg/g增加到31.91 mg/g,说明砷和镉之间存在协同作用,该协同作用是由于镉、砷与四氧化三铁形成了B型三元表面配合物,增大了镉的吸附量。

Fe3O4 is used to modify husk biochar to obtain magnetic biochar.The obtained biochar is characterized by SEM and XRD.Response surface optimization and co-adsorption experiments are conducted to investigate the adsorption performance of the biochar to As3+ and Cd2+ in the co-adsorption system.The results show that the removal rates of the biochar to cadmium and arsenic respectively reach the highest when pH is 5.0, initial mass concentration of As3+ or Cd2+ is 10 mg•L-1 and adsorbent dosage is 1 g•L-1.In As3+/Cd2+co-adsorption experiment, when...