研究报告
温子宁,谢春生,谢莹莹,蔡海明,党志,黄伟林,易筱筠,卢桂宁.锰氧化物负载施氏矿物去除酸性矿山废水中As(III)的性能及机理[J].环境科学学报,2021,41(12):4783-4792
锰氧化物负载施氏矿物去除酸性矿山废水中As(III)的性能及机理
- Removal performance and mechanism of As(III) by manganese oxide coated schwertmannite from acid mine drainage
- 基金项目：国家自然科学基金（No.41720104004，41931288）；广东特支计划本土创新创业团队项目（No.2019BT02L218）；广东省重点领域研发计划项目（No.2019B110207001）
- 作者
- 单位
- 温子宁
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 谢春生
- 肇庆学院, 环境与化学工程学院, 肇庆 526061
- 谢莹莹
- 韩山师范学院化学与环境工程学院, 潮州 521041
- 蔡海明
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 党志
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 黄伟林
- 罗格斯大学环境科学系, 新泽西 08901-8551
- 易筱筠
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 卢桂宁
- 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006
- 摘要：施氏矿物是天然的砷吸附剂,但其存在酸性条件下对As(III)吸附性能较弱且无法对As(III)氧化降毒的缺陷. 采用液相沉淀法成功制备出锰氧化物负载施氏矿物(MnOx@Sch),研究锰负载量、初始pH值和共存离子对MnOx@Sch去除As(III)的影响,并采用吸附动力学结合XPS、FTIR及TEM等表征探究该过程的机理. 结果表明:在初始pH=3、投加量为0.5 g·L-1、As(III)初始浓度为1 mg·L-1的条件下,As(III)与MnOx@Sch反应后的剩余浓度仅为2.42~3.38 μg·L-1.MnOx@Sch去除As(III)受初始pH影响较小,H2PO4-共存时As(III)去除存在明显的抑制作用. MnOx@Sch 去除As(III)的过程符合准二级动力学方程和颗粒内扩散方程. 液相化学组分和固相产物表征分析显示MnOx@Sch对As(III)的去除机理可概括为As(III)氧化、静电吸附和络合配位及配体交换. 研究结果可为施氏矿物及其改性材料应用于酸性矿山废水砷污染治理提供理论依据.
- Abstract：Schwertmannite is a natural adsorbent of As, but it application for As(III) removal from acidic condition was restricted since the weak adsorption capacity and lack of oxidation ability. In this study, manganese oxide coated schwertmannite (MnOx@Sch) was successfully synthesized by using liquid-phase precipitation method and the effects of manganese concentration, initial pH and co-exist ion on As(III) removal were studied. The adsorption kinetics combined with XPS, FTIR and TEM were used to investigate the mechanism of As(III) removal by MnOx@Sch. The results show that when the initial pH was 3, the dosage was 0.5 g·L-1 and original As(III) concentration was 1 mg·L-1, the residual As concentration was only 2.42~3.38 μg·L-1 after reaction. The effect of initial pH on the removal of As(III) by MnOx@Sch was slight and was significantly inhibited in the presence of H2PO4-. The process of As(III) removal by MnOx@Sch well fits the pseudo-second order kinetic and intraparticle diffusion model. Results of the chemical components analysis in liquid and solid phase reveal that the removal mechanism of As(III) by MnOx@Sch includes As(III) oxidation, electrostatic adsorption, complexation and ligand-exchange. The results could provide theoretical basis for the application of schertmananite in the treatment of arsenic pollution in acid mine drainage.
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