研究论文
朱赫特,郭雅欣,陈晓,龚婷婷,鲜啟鸣.磷酸改性水生植物生物炭吸附微囊藻毒素-LR及其影响因素[J].环境科学学报,2021,41(5):1878-1890
磷酸改性水生植物生物炭吸附微囊藻毒素-LR及其影响因素
- Adsorption of microcystin-LR by phosphoric acid modified aquatic plant biochar and its influencing factors
- 基金项目：国家水体污染控制与治理科技重大专项（No.2017ZX07204004）；国家自然科学基金（No.21876078）；太湖水环境综合治理科研课题基金资助项目（No.TH2016301）
- 作者
- 单位
- 朱赫特
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 郭雅欣
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 陈晓
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 龚婷婷
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 鲜啟鸣
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 摘要：将水生植物制成生物炭是水生植物资源化利用的新方式，本研究将两种水生植物苦草和狐尾藻在不同温度下热解制备生物炭并用磷酸进行改性，探究了生物炭对水中微囊藻毒素（以MC-LR为例）去除的影响，并研究了其对MC-LR的吸附动力学及影响因素.同时，采用扫描电镜、元素分析、比表面及孔径分析、FTIR和XPS对生物炭进行表征.结果表明，生物炭表面含有丰富的含氧官能团，更高热解温度制备的生物炭具有更丰富的孔隙，对MC-LR的去除率也更高.生物炭对MC-LR的吸附符合准一级动力学、准二级动力学和颗粒内扩散模型.离子强度对生物炭吸附的影响较小，而较高的pH、较大分子量的DOM会抑制吸附.磷酸改性能提高生物炭的吸附性能，并且减弱pH和DOM对生物炭吸附效果的影响.综上，利用水生植物制备的改性生物炭可用于吸附MC-LR，为控制水体中的微囊藻毒素污染提供了新的思路和理论依据.
- Abstract：The preparation of biochar from aquatic plants is a new way of resource utilization of aquatic plants. In this study, aquatic plants Vallisneria natans and Myriophyllum verticillatum were pyrolyzed at different temperatures to prepare biochar and modified with phosphoric acid. The effect of biochar on the removal of microcystin-LR (MC-LR) in water was investigated, and the adsorption kinetics and influencing factors of MC-LR were also studied. SEM, elemental analysis, specific surface area and pore size analysis, FTIR and XPS were used to characterize biochar in the research. The results showed that the surfaces of biochar were rich in oxygen-containing functional groups, and the biochar prepared with higher pyrolysis temperature had more abundant pores and a higher rate of MC-LR removal. The adsorption kinetics of MC-LR by biochar conformed to pseudo-first order, pseudo-second order and intra-particle diffusion models. Ionic strength has little effect on adsorption of MC-LR by the biochar, while higher pH or higher molecular weight DOM could inhibit the adsorption. The modification of phosphoric acid can improve the adsorption performance of biochar and weaken the influence of pH and DOM on the adsorption of MC-LR by biochar. In summary, the modified biochar prepared from aquatic plants can be used to effectively adsorb MC-LR, which might provide new insight and theoretical basis for the control of microcystin pollution in water bodies.
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