Manganese-modified biochar for highly efficient sorption of cadmium
Manganese-modified biochar for highly efficient sorption of cadmium
复制标题
锰改性生物炭可高效吸附镉
DOI：
10.1007/s11356-019-07059-w
复制
发表时间：
2020-01
影响因子：
5.8
通讯作者：
Aijun Lin
中科院分区：
文献类型：
--
作者：
Xiao Tan;Wenxia Wei;Congbin Xu;Yue Meng;Wenrong Bai;Wenjie Yang;Aijun Lin
本研究在厌氧条件下，在不同温度（400~600℃）热解前（MBC1）和热解后（MBC2）对玉米秸秆进行锰（Mn）改性，以实现水和土壤中镉的吸附。在水溶液中进行批量实验，以评估经锰改性和未经锰改性的生物炭的最佳吸附能力。两种类型的锰改性均能提高生物炭对Cd(II)的吸附能力，优于相应的未经改性的原始生物炭，特别是在500℃下以5:1的改性比例热解的生物炭。在最佳制备条件下，MBC2的吸附率比MBC1高11.01%。根据等温线模型计算MBC2的最大吸附容量为191.94 mg g(-1)。 MBC2的性能也在镉污染土壤的土壤稳定实验中得到了验证。从BCR提取结果可以看出，MBC2的所有施用量（1%、2%和3%）都能降低弱酸溶部分Cd。可还原组分、可氧化组分和残留组分Cd均呈上升趋势，从而控制了土壤中Cd的迁移、转化和富集。特性分析表明，改性后的生物炭具有更多的不规则褶皱和更多的颗粒聚集表面。这些聚集颗粒的主要成分是具有高吸附能力的锰氧化物（MnOx），如MBC2上负载的MnOx晶体结构是δ-MnO2和MnO的混合结构。然而，这些颗粒可能会堵塞生物炭的孔隙，或者在改性过程中，一些孔隙可能会在高温下塌陷。即使MBC的吸附效果大大增强，但比表面积却降低了。同时，在MBC2改性过程的二次热解作用下，MBC2具有更高的芳构化程度，具有更多潜在的Cd活性吸附位点。该研究得出的结论是，MBC2 可能是水和土壤实际应用中镉的一种有前景的修正剂。
In this study, corn stalk was modified by manganese (Mn) before (MBC1) and after (MBC2) pyrolysis at different temperatures (400~600 degrees C) under anaerobic conditions for Cd sorption in both water and soil. Batch experiments in aqueous solution were conducted to evaluate the optimum sorption capability by biochar with and without manganese-modified. Both types of manganese modification can improve the sorption capacity of Cd(II) on biochar, which is superior to the corresponding pristine biochar without modification, especially, pyrolyzed at 500 degrees C with 5:1 modification ratio. Under the optimal preparation conditions, the sorption percentage on MBC2 was 11.01% higher than that of MBC1. The maximum sorption capacity of MBC2 was 191.94 mg g(-1) calculated by isotherm model. The performance of MBC2 was also verified in soil stabilization experiments in Cd-contaminated soil. We can conclude from the results of BCR extraction that all the application rates of MBC2 (1%, 2%, and 3%) can reduce the mild acid-soluble fraction Cd. The reducible, oxidizable, and residual fraction Cd showed an upward trend, thus controlling the migration, transformation, and enrichment of Cd in soil. The characteristic analysis showed biochar has more irregular fold and more particle-aggregated surface after modification. The main components of these aggregated particles are manganese oxides (MnOx) with high sorption capacity, such as the MnOx crystal structure loaded on MBC2 is a mixed structure of delta-MnO2 and MnO. However, these particles may block the biochar pores, or some of the pores may collapse at high temperatures during the modification process. The specific surface area was reduced, even if the sorption effect of MBC was strongly enhanced. Meanwhile, under the action of the secondary pyrolysis of MBC2 modification process, the MBC2 has a higher degree of aromatization with more potential active sorption sites for Cd. The study concluded that the MBC2 could be a promising amendment for Cd in both water and soil real field applications.
登录
查看更多内容
不同 MnO2 多晶型物降解 1,2,4-三氯苯的常规/持久自由基及相关反应机制
影响因子：
11.4
作者：
Li Qianqian;Huang Xinchen;Su Guijin;Zheng Minghui;Huang Chunhua;Wang Mengjing;Ma Chunyan;Wei Da
通讯作者：
Wei Da
影响因子：
5.8
作者：
Cao, Xueying;Hu, Pengjie;Luo, Yongming
通讯作者：
Luo, Yongming
Sb在δ-MnO2上的氧化和吸附机理
影响因子：
15.1
作者：
Sun Qian;Liu Cun;Alves Marcelo Eduardo;Ata-Ul-Karim Syed Tahir;Zhou Dong-Mei;He Jian-Zhou;Cui Pei-Xin;Wang Yu-Jun
通讯作者：
Wang Yu-Jun
影响因子：
15.1
作者：
Lin Xiong;Ye Yang;Jiaxing Mai;Weiling Sun;Chaoying Zhang;Dapeng Wei;Qing Chen;J. Ni
通讯作者：
Lin Xiong;Ye Yang;Jiaxing Mai;Weiling Sun;Chaoying Zhang;Dapeng Wei;Qing Chen;J. Ni
影响因子：
9.9
作者：
Yinan Wang;Qingchuan Li;Ping Zhang;David O’Connor;R. Varma;Miao Yu;De-Jian Hou
通讯作者：
Yinan Wang;Qingchuan Li;Ping Zhang;David O’Connor;R. Varma;Miao Yu;De-Jian Hou