[1]苗玉杰,汪院生,郭西亚,等.膨润土改性微囊藻基生物炭对Cr(Ⅵ)的吸附性能[J].江苏农业学报,2024,(02):270-280.[doi:doi:10.3969/j.issn.1000-4440.2024.02.009]
　MIAO Yu-jie,WANG Yuan-sheng,GUO Xi-ya,et al.Adsorption properties of bentonite-modified Microcystis-based biochar to Cr(Ⅵ)[J].,2024,(02):270-280.[doi:doi:10.3969/j.issn.1000-4440.2024.02.009]
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膨润土改性微囊藻基生物炭对Cr(Ⅵ)的吸附性能()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2024年02期
页码:
270-280
栏目:
耕作栽培·资源环境
出版日期:
2024-02-25

文章信息/Info

Title:
Adsorption properties of bentonite-modified Microcystis-based biochar to Cr(Ⅵ)
作者:
苗玉杰1; 2;  汪院生3;  郭西亚4;  梁庆华3;  卢信5;  邓建才1
(1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,江苏南京210008；2.中国科学院大学,北京100049；3.江苏省太湖水利规划设计研究院有限公司,江苏苏州215128;4.江苏省环境工程技术有限公司,江苏南京210019;5.江苏省农业科学院农业资源与环境研究所,江苏南京210014)
Author(s):
MIAO Yu-jie1; 2; WANG Yuan-sheng3; GUO Xi-ya4; LIANG Qing-hua3; LU Xin5; DENG Jian-cai1
(1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008，China;2.University of Chinese Academy of Sciences, Beijing 100049， China;3.Jiangsu Taihu Planning and Design Institute of Water Resources Co., Ltd., Suzhou 215128， China;4.Jiangsu Environmental Engineering Technology Co., Ltd., Nanjing 210019， China;5.Institute of Agricultural Resource and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014， China)
关键词:
微囊藻基生物炭; 膨润土; Cr(Ⅵ); 吸附
Keywords:
Microcystis-based biochar; bentonite; Cr(Ⅵ); adsorption
分类号:
X52
DOI:
doi:10.3969/j.issn.1000-4440.2024.02.009
摘要:
针对高毒性含铬废水处理难、水华藻类资源化利用率低等问题，本研究拟制备膨润土改性微囊藻基生物炭(BMC)，使用扫描电镜、X射线衍射和比表面积分析等方法对使用膨润土改性前后的微囊藻基生物炭的属性进行表征，研究初始pH、生物炭投加量对改性前后微囊藻基生物炭吸附Cr(Ⅵ)效果的影响，并对吸附过程进行动力学和等温模型拟合。结果表明，膨润土改性后微囊藻基生物炭表面官能团和阳离子交换容量均大幅增加，改性前后微囊藻基生物炭对Cr(Ⅵ)的吸附过程均符合准二级动力学模型和Langmuir等温模型；在pH=2、投加量为2 g/L的试验条件下，改性微囊藻基生物炭对Cr(Ⅵ)的饱和吸附容量达到10.87 mg/g，是改性前微囊藻基生物炭(MC) 饱和吸附容量的3.94倍，微囊藻基生物炭改性后显著促进了对Cr(Ⅵ)的吸附；静电吸附和氧化还原作用是微囊藻基生物炭去除Cr(Ⅵ)的主要机制。本研究成果可为含铬废水处理提供新方法，并可为水华藻类的资源化利用提供新思路。
Abstract:
Aiming at the problems such as difficult treatment of highly toxic chromium-containing wastewater and poor efficiency of resource utilization of algae, bentonite-modified Microcystis-based biochar (BMC) was to be prepared in this study. The properties of Microcystis-based biochar before and after modified by bentonite were characterized by scanning electron microscope, X-ray diffraction and specific surface area analysis. The effects of initial pH and biochar dosage on the Cr(Ⅵ) adsorption of Microcystis-based biochar before and after modified were studied, and the adsorption processes were fitted by kinetic and isothermal models. The results show that, the surface functional groups and cation exchange capacity of Microcystis-based biochar increased significantly after modified by bentonite, and the adsorption process of Cr(Ⅵ) by the Microcystis-based biochar before and after modified were all characterized by the quasi-secondary kinetic model and Langmuir isothermal model. Under the experimental conditions of pH=2 and dosage of 2 g/L, the saturated adsorption capacity of Cr(Ⅵ) by modified Microcystis-based biochar reached 10.87 mg/g, which was 3.94 times of Microcystis-based biochar (MC) before modification. The adsorption of Cr(Ⅵ) was significantly promoted by the modified Microcystis-based biochar. Electrostatic adsorption and redox were the key mechanisms for Cr(Ⅵ) removal by Microcystis-based biochar. The research results can provide new methods for the treatment of chromium-containing wastewater and new ideas for resource utilization of algae blooms.

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备注/Memo

备注/Memo:
收稿日期：2023-02-07基金项目：国家自然科学基金项目(32273137)；国家水体污染控制与治理科技重大专项(2017ZX07205-02)作者简介：苗玉杰（1997-），男，河南济源人，硕士研究生，主要研究方向为湖泊生态环境与污染修复。(E-mail) 1037792265@163.com通讯作者：邓建才，（E-mail）jcdeng@niglas.ac.cn
更新日期/Last Update: 2024-03-17