不同温度玉米秸秆生物炭对萘的吸附动力学特征与机理  

SORPTION KINETICS AND MECHANISM OF NAPHTHALENE ON CORN-STALKDERIVED BIOCHAR WITH DIFFERENT PYROLYSIS TEMPERATURE

作　　者：张默[1,2] 贾明云[2] 卞永荣[2] 生弘杰 柳广霞 王玉军[1] 王芳[2] 

机构地区：[1]山东农业大学资源与环境学院,山东泰安271018 [2]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008

出　　处：《土壤学报》2015年第5期1106-1115,共10页Acta Pedologica Sinica

基　　金：国家重点基础研究发展计划(973计划)项目第五课题(2014CB441105);农业部公益项目(201203045);国家自然科学基金项目(21277148;41271464);江苏省自然科学基金项目(BK20131463)共同资助

摘　　要：通过批平衡实验,研究不同剂量热解温度(300、400、500、600℃,记作C300、C400、C500、C600)玉米秸秆生物炭对萘的吸附动力学特征与机理。同一热解温度下生物炭投加剂量为10 mg时对萘的平衡吸附量大于50 mg。热解温度对生物炭吸附萘的影响也不同,投加剂量为10 mg时,萘的平衡吸附量为C400>C300>C600>C500;剂量为50 mg时,C300、C400和C600的平衡吸附量相近,而C500的平衡吸附量最低。生物炭对萘的吸附动力学数据随时间的变化可以用假二级动力学方程很好地拟合,表明生物炭对萘的吸附是复杂的,并不是单一的单层吸附。用颗粒内扩散模型和Boyd模型分析,发现液膜扩散以及颗粒内扩散均影响吸附过程,且液膜扩散为限速因素。Biochar is a carbon-rich material produced by Due to the presence of well-develope excellent sorption capacity and in the field of agriculture and persistent hydrophobic organic hence is d micro- deemed pores and pyrolyzing bioma specific surface ss in the absence of oxygen. area, biochar as green environmental sorbent and has been environment. Polycyclic aromatic hydro pollutants commonly found in soil and of sorbents to PAHs, sorption has become a critical process environment. An experiment was carried out different temperatures, to explore k in the PAHs family, and effect of demonstrating therefore, es inetics of dosage that sorption kinetics is a use sential to have select an optimal sorbent, th using biochars the biochar sor carbons （ PAHs ） are sediments. Thanks to displays an extensively used a typical kind of governing the fate and transport of PAHs in the prepared through pyrolyzing corn stalks under bing naphthalene, a volatile organic compound of biochar on the kinetics. So far, reports have been available ful tool to explain the mechanism of naphthalene sorption. It is, a better understanding of the mechanism of biochar sorbing naphthalene and rough studying effects of pyrolysis temperatures and dosage of corn-stalk-derived biochar on sorption kinetics of naphthalene. The experiment was designed to use the batch processing method. Out of each of the four kinds of biochars, C300, C400 , C500 and C600, prepared under 300℃, 400℃, 500℃ and 600℃, respectively, in pyrolysis, two portions, 10 mg and 50 mg each, were taken and put into flasks separately. Into each flask, 10 mL of CaCl2 solution containing 25 mg L^-1 naphthalene was added. A soil ion environment was simulated with 0.01 tool L^-1CaCl2 solution as background solution. The mixture was shaken at 30 ＋ 2℃ and 120 rpm for 10 rain, 1, 4, 6, 12, 24 and 48 h, separately, in dark and then sampled. Fitting analysis of the kinetic data was performed with the pseudo-first-order kinetic model, the pseudo-second-order kinetic model, the intra

关 键 词：生物炭 多环芳烃 吸附动力学 吸附机理 

分 类 号：X53[环境科学与工程—环境工程]