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| Adsorption characteristics of biochar prepared by corn stalk alkalization on zinc |
| Received:June 29, 2017 |
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| KeyWord:corn stalk;biochar;alkaline modification;zinc;adsorption;characterization |
| Author Name | Affiliation | E-mail | | ZHU Yin-tao | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | LI Ye-dong | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Environmental Protection Bureau of the Changchun Jingyue Economic Development Zone, Changchun 130122, China | | | WANG Ming-yu | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | MA Xiu-lan | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | 491277643@qq.com | | ZHANG Qiu-ping | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | | | WANG Yu-jun | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China | jlndwangyujun@163.com |
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| 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. |
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