| 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. |
| 玉米秸秆碱化处理制备的生物炭吸附锌的特性研究 |
| Adsorption characteristics of biochar prepared by corn stalk alkalization on zinc |
| 投稿时间：2017-06-29 |
| DOI：10.11654/jaes.2017-0917 |
| 中文关键词: 玉米秸秆 生物炭 碱化改性 锌 吸附 表征 |
| 英文关键词: corn stalk biochar alkaline modification zinc adsorption characterization |
| 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） |
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| 中文摘要: |
| 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pH2.0~5.0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。 |
| 英文摘要: |
| 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. |
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