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| Application of biochar derived from kiwi pruning branches for Cd2+ and Pb2+ adsorption in aqueous solutions |
| Received:January 04, 2019 |
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| KeyWord:kiwi pruning branches;biochar;adsorption;Cd-Pb compound solution |
| Author Name | Affiliation | E-mail | | REN Chun-yan | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | GUO Di | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | LIU Xiang-yu | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | LI Rong-hua | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | DU Juan | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | | | ZHANG Zeng-qiang | College of Resources and Environment, Northwest A & F University, Yangling 712100, China | zhangzq58@126.com |
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| Abstract: |
| This research aims to investigate the effect of biochar derived from kiwi pruning branches on Cd2+ and Pb2+ in aqueous solutions. The affecting factors including initial concentration, adsorption time, initial pH, and sorbent dosage were investigated in batch experiments. The adsorption capacity of biochar for Cd2+ and Pb2+ from aquaculture wastewater and landfill leachate was tested. The biochar before and after adsorption was characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results indicated that kiwi pruning branches biochar had high porous structure and abundant surface functional groups. The optimal conditions for Cd2+ and Pb2+ adsorption were pH 4~6 with 120 min contact time (reached equilibrium). The optimal sorbent dosages were 4.0 g·L-1 for Cd2+ and 3.0 g·L-1 for Pb2+, and the maximal adsorption capacity was recorded at 9.35 and 65.9 mg·g-1, respectively. Additionally, Cd2+ and Pb2+ adsorption onto biochar followed a pseudo second order model. The adsorption characteristics of Cd2+ were well described by the Langmuir equation with a theoretical maximum adsorption capacity of 13.1 mg·g-1, whereas the Freundlich equation was more appropriate for Pb2+ adsorption. Overall, the kiwi pruning branches biochar shows higher adsorption performance and potential application in Cd2+ and Pb2+ removal from wastewater. |
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