鸡粪生物炭吸附固定铅的研究  

Application of Chicken Manure-derived Biochar for Adsorption of Lead

作　　者：周蕾 陈兆兰 严玉波 李桥[3] ZHOU Lei;CHEN Zhaolan;YAN Yubo;LI Qiao(School of Chemistry and Chemical Engineering,Huaiyin Normal University,Jiangsu Huai’an 223300,China;Institute of Environmental and Sustainable Development in Agriculture,Chinese Academy of Agricultural Science,Beijing 100081,China;School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]淮阴师范学院化学化工学院,江苏淮安223300 [2]中国农业科学院农业环境与可持续发展研究所,北京100081 [3]南京理工大学环境与生物工程学院,南京210094

出　　处：《中国农业科技导报》2022年第11期199-207,共9页Journal of Agricultural Science and Technology

基　　金：国家自然科学基金项目(41907133);江苏省自然科学基金项目(BK20191057)。

摘　　要：随着规模化养殖的快速发展,畜禽粪便的产量随之增加,如何对其进行有效处理与资源化利用已成为研究热点。选取鸡粪为原料,在400℃下限氧热解制备生物炭(CMBC-400),探究其对水体中铅离子(Pb^(2+))的吸附性能。通过批处理试验考察吸附时间、Pb^(2+)初始含量、吸附温度等因素对CMBC-400吸附Pb^(2+)性能的影响,并利用吸附动力学、等温线和热力学计算模型对吸附数据进行拟合,进一步阐述吸附过程。结果表明,CMBC-400吸附Pb^(2+)的过程更符合准二级动力学模型,表明该吸附过程的吸附速率主要受化学吸附控制;相比Freundlich和Dubinin-Radushkevich(D-R)模型,Langmuir等温线模型具有更高的拟合相关系数,表明CMBC-400表面均一,Pb^(2+)吸附位点的吸附能大致相同;吸附热力学数据表明CMBC-400对Pb^(2+)的吸附过程是自发的吸热反应。扫描电镜和X-射线衍射表征结果表明,CMBC-400主要通过在表面形成含Pb微晶的形式固定水体中的Pb^(2+)。此外,向土壤中添加CMBC-400还可促进有效态Pb转化为稳定态,降低Pb的生物有效性。With the rapid development of large-scale breeding,the production of poultry manure increases accordingly,how to treat and recycle it has increasingly become a research hotspot. The performance of chicken manure-derived biochar(CMBC-400,pyrolysis temperature of 400 ℃)was investigated to remove Pb^(2+)in wastewater.The sorption kinetics,isotherms and thermodynamics of Pb^(2+)adsorption on CMBC-400 were investigated by batch experiments. The experimental data fitted well with the pseudo-second order model,which indicated chemisorption was the rate-limiting step of sorption process. Equilibrium sorption of CMBC-400 on Pb^(2+)fitted best with the Langmuir model,indicating a fixed number of identical and energetically equivalent active sites on the homogeneous surface of CMBC-400. The thermodynamic investigation confirmed that the sorption of CMBC-400 on Pbcould carry out spontaneously,and the higher temperature favored the processes. The SEM and XRD analysis indicated that CMBC-400 could intensely adsorb solution Pbvia precipitation of Pb-containing microcrystals. Moreover,soil experiments indicated that addition of CMBC-400 could effectively enhanced the conversion of the available Pb to the stable forms,thereby decreasing the bioavailability of soil Pb.

关 键 词：鸡粪生物炭 铅 吸附 固定 

分 类 号：S141[农业科学—肥料学]