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玉米秸秆碱化处理制备的生物炭吸附锌的特性研究
引用本文:朱银涛,李业东,王明玉,马秀兰,张秋萍,王玉军.玉米秸秆碱化处理制备的生物炭吸附锌的特性研究[J].农业环境科学学报,2018,37(1):179-185.
作者姓名:朱银涛  李业东  王明玉  马秀兰  张秋萍  王玉军
作者单位:吉林农业大学资源与环境学院, 长春 130118,吉林农业大学资源与环境学院, 长春 130118;长春市环境保护局净月经济开发区分局, 长春 130122,吉林农业大学资源与环境学院, 长春 130118,吉林农业大学资源与环境学院, 长春 130118,吉林农业大学资源与环境学院, 长春 130118,吉林农业大学资源与环境学院, 长春 130118
基金项目:吉林省科技发展计划项目(20150412004XH,20180101086JC);吉林省教育厅科技项目(2016-190)
摘    要:为研究玉米秸秆碱化处理制备的生物炭对模拟废水中Zn的吸附特性,以玉米秸秆为原料制备玉米秸秆生物炭(BC),同时对玉米秸秆进行碱化浸渍处理来获得碱化改性生物炭(K-BC),并在此基础上研究了BC和K-BC对Zn的吸附动力学、吸附热力学以及pH对其吸附的影响,结合元素分析、比表面积孔径测定、扫描电镜及红外光谱等表征来分析其对Zn的吸附差异。结果表明:当Zn浓度为60 mg·L~(-1),BC和K-BC对Zn的吸附过程由快速吸附和慢速吸附2个阶段组成,且符合准二级动力学吸附模型;BC和K-BC对Zn的吸附量随温度(288~318 K)和Zn浓度(10~120 mg·L~(-1))的增加而增加,其中K-BC对Zn的理论饱和吸附量大于BC,且由Freundlich模型对吸附过程进行描述较为合适;热力参数表明BC和K-BC对Zn的吸附为自发、吸热和无序度增加的过程;在pH_2.0~5.0范围内,当pH为5.0时K-BC对Zn的吸附量最大,吸附率接近50%。由BC和K-BC结构表征及理化特性差异可以推知,这2种生物炭对Zn吸附差异来源于其比表面积、孔隙结构和芳香结构之间的差异。

关 键 词:玉米秸秆  生物炭  碱化改性    吸附  表征
收稿时间:2017/6/29 0:00:00

Adsorption characteristics of biochar prepared by corn stalk alkalization on zinc
ZHU Yin-tao,LI Ye-dong,WANG Ming-yu,MA Xiu-lan,ZHANG Qiu-ping and WANG Yu-jun.Adsorption characteristics of biochar prepared by corn stalk alkalization on zinc[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2018,37(1):179-185.
Authors:ZHU Yin-tao  LI Ye-dong  WANG Ming-yu  MA Xiu-lan  ZHANG Qiu-ping and WANG Yu-jun
Institution:College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China,College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China;Environmental Protection Bureau of the Changchun Jingyue Economic Development Zone, Changchun 130122, China,College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China,College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China,College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China and College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Abstract:The adsorption characteristics of biochar prepared by corn stalk alkalization treatment to simulated wastewater were studied. Corn-stalk biochar(BC) and alkaline-modified biochar(K-BC) were prepared using corn stalks and alkalized impregnated corn stalks, respectively. The effects of BC and K-BC on the adsorption kinetics, Zn adsorption thermodynamics, and pH on Zn adsorption were investigated. Simultaneously, adsorption mechanisms and differences of Zn by BC and K-BC were characterized using elemental analysis, specific surface area pore size determination, scanning electron microscopy(SEM), and fourier transform infrared spectrometer(FTIR). The results indicated that adsorption process of Zn on BC and K-BC were consisted of the rapid and slow section at Zn concentration of 60 mg·L-1, and the quasi-second-order kinetic adsorption model could describe the adsorption process effectively. The adsorption capacity of Zn on BC and K-BC increased with increasing temperature from 288 K to 318 K and Zn concentrations from 10 mg·g-1 to 120 mg·g-1, and the adsorption process was well fitted to the Freundlich equation. Thermodynamic parameters revealed that Zn adsorption by BC and K-BC was a feasible, spontaneous, and endothermic process with an increase in disorder. Over a pH range of 2.0~5.0, the adsorption capacity of K-BC to Zn was the highest, and the adsorption rate was close to 50% at pH=5.0. According to the structural characterization and physical and chemical properties of BC and K-BC, differences in Zn adsorption by BC and K-BC were derived from their specific surface area, pore structure, and fragrance structure.
Keywords:corn stalk  biochar  alkaline modification  zinc  adsorption  characterization
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