载镁香蕉秆基生物炭对养猪废水中磷的吸附性能  

Adsorption Property of Phosphorus by Magnesium-Loaded Banana Stem Biochar from Swine Wastewater

作　　者：蒋艳红[1,2] 李安玉 邓华 叶成慧[1] 黄皓麟 JIANG Yanhong;LI Anyu;DENG Hua;YE Chenghui;HUANG Haolin(School of Environment and Resources,Guangxi Normal University,Key Laboratory of Lava Ecology and Environmental Change,Guangxi Normal University,541006;School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西师范大学环境与资源学院,广西师范大学溶岩生态与环境变化研究重点实验室,541006 [2]桂林理工大学环境科学与工程学院,广西桂林541004

出　　处：《水处理技术》2020年第6期33-38,44,共7页Technology of Water Treatment

基　　金：国家自然科学基金项目(51638006);广西高校中青年教师科研基础能力提升项目申请书(2020KY02035);广西普通高校研究生科研创新计划项目(XYCSZ2018067)。

摘　　要：以香蕉秸秆为原料,氯化镁(MgCl2)为改性剂,通过批量吸附实验,研究了镁改性香蕉秆基生物炭(MgBC)对养猪废水中磷(P)的吸附过程。利用等温吸附模型和动力学模型揭示吸附行为,并利用表征技术探究MgBC对养猪废水中P的吸附机制。结果表明,MgBC对P的理论最高吸附量为60.98 mg/g,吸附过程符合Freundlich模型,为多分子层的化学吸附;动力学吸附均符合准2级动力学,吸附过程主要包括表面吸附、颗粒内扩散以及液膜扩散。MgBC吸附养猪废水中P的主要机理是形成Mg-O-P低结晶度的化合物以及生物炭表面C-H、C=O、C-OH等官能团参与PO43-反应。The adsorption process of phosphorus(P)from swine wastewater by magnesium-loaded banana stem biochar(MgBC)was studied through batch adsorption experiments,the banana stem as the raw material and MgCl2 as the modifier.The adsorption behavior was revealed by isothermal adsorption model and kinetic model,and the adsorption mechanism of P byMgBC from swine wastewater was studied through characterization techniques.The results indicated that,the theoretical maximum adsorption capacity of P on MgBC was 60.98 mg/g,the adsorption process was described well by the Freundlich model and it was chemical adsorption of multi-molecular layers.The adsorption kinetics was described well by the pseudo-second-order model and the adsorption process mainly included surface adsorption,intragranular diffusion and liquid membrane diffusion.The main mechanism of P adsorption onto MgBC in swine wastewater was to form Mg-O-P low crystallinity compounds and functional groups such as C-H,C=O and C-OH on the surface of biochar to participate in PO43-reaction.

关 键 词：生物炭 养猪废水 吸附剂 吸附 

分 类 号：X713[环境科学与工程—环境工程]