文章摘要
任春燕,郭堤,刘翔宇,李荣华,杜娟,张增强.猕猴桃木生物质炭对溶液中Cd2+、Pb2+的吸附及应用研究[J].农业环境科学学报,2019,38(8):1982-1990.
猕猴桃木生物质炭对溶液中Cd2+、Pb2+的吸附及应用研究
Application of biochar derived from kiwi pruning branches for Cd2+ and Pb2+ adsorption in aqueous solutions
投稿时间:2019-01-04  
DOI:10.11654/jaes.2019-0012
中文关键词: 猕猴桃修剪枝  生物质炭  吸附  镉-铅复合溶液
英文关键词: kiwi pruning branches  biochar  adsorption  Cd-Pb compound solution
基金项目:国家重点研发计划项目(2017YFD0801101)
作者单位E-mail
任春燕 西北农林科技大学资源环境学院, 陕西 杨凌 712100  
郭堤 西北农林科技大学资源环境学院, 陕西 杨凌 712100  
刘翔宇 西北农林科技大学资源环境学院, 陕西 杨凌 712100  
李荣华 西北农林科技大学资源环境学院, 陕西 杨凌 712100  
杜娟 西北农林科技大学资源环境学院, 陕西 杨凌 712100  
张增强 西北农林科技大学资源环境学院, 陕西 杨凌 712100 zhangzq58@126.com 
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中文摘要:
      为探讨生物质炭对废水中重金属的吸附性能,以猕猴桃修剪枝为原料制备生物质炭,通过静态吸附法研究了其对复合溶液中Cd2+、Pb2+的吸附,探究了溶液初始浓度、吸附时间、pH值及生物质炭投加量对溶液中Cd2+、Pb2+吸附效果的影响,同时采用扫描电镜(SEM)和傅里叶红外光谱(FTIR)对吸附前后的生物质炭结构进行了表征,并讨论了其对养殖废水和垃圾渗滤液中Cd2+和Pb2+的吸附能力。结果表明:猕猴桃木生物质炭具有多孔结构和多种表面官能团。Cd2+、Pb2+的最优吸附条件是pH为4~6,120 min吸附达到平衡,最佳投加量分别为4.0、3.0 g·L-1,最大吸附量分别为9.35、65.9 mg·g-1。生物质炭对Cd2+、Pb2+的吸附过程用准二级动力学方程能较好地描述;在25℃条件下,生物质炭对Cd2+的吸附用Langmuir方程能更好地描述,其理论最大吸附量达13.1 mg·g-1,而生物质炭对Pb2+的吸附过程用Freundlich方程能更好地描述。猕猴桃木生物质炭可作为处理轻度重金属复合污染废水的吸附剂。
英文摘要:
      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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