Enhanced antimonate (Sb(V)) removal from aqueous solution by La-doped magnetic biochars
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- Enhanced antimonate (Sb(V)) removal from aqueous solution by La-doped magnetic biochars
- 发表刊物：
- Chemical Engineering Journal
- 摘要：
- A novel La-doped magnetic biochar was synthesized by a co-precipitation method for efficient Sb(V) removal. In contrast to pristine biochar and un-doped magnetic biochar, the Sb(V) adsorption capacity in La-doped magnetic biochar was greatly improved, increasing from 2.22 mg/g and 4.85 mg/g to 18.92 mg/g at pH of 7.0, respectively. The enhanced Sb(V) adsorption remained over a wide pH range (2-10), despite the existence of Cl-, SO42-, NO3-, HCO3-, or H2PO4-. These competing anions had little interference with Sb(V) sorption except HCO3- and H2PO4-. The combined results of TEM, XRD, FTIR and XPS further confirmed that La atom was successfully doped into the Fe3O4 structure. The point of zero charge of the biochar increased accordingly with a number of hydroxyl groups (i.e.≡La–OH) formed on the surface. Although the magnetic performance decreased after La doping, La-doped magnetic biochar still showed high separation potential. The comparison of FTIR and XPS analyses before and after Sb(V) adsorption revealed that the formation of inner-sphere La–O–Sb complex was the dominant contribution for Sb(V) sorption enhancement. Meanwhile, other mechanisms such as hydrogen bonding, electrostatic attraction and ligand exchange were also involved. All the results suggested that La-doped magnetic biochars could serve as promising adsorbents for Sb(V) pollution minimization.
- 合写作者：
- Li Wang*,Jingyi Wang, Zixuan Wang, Chi He, Wei Lyu, Wei Yan*, Liu Yang
- 卷号：
- 354
- 页面范围：
- 623-632
- 是否译文：
- 否
- 发表时间：
- 2018-08-12