废白土-花生壳生物炭吸附剂的制备及对Pb(Ⅱ)的吸附  

Preparation of Spent Bleaching Earth-Peanut Shell Biochar Adsorbent for Removal of Pb(Ⅱ)in Water

作　　者：李燕[1] 陈梅芹[1] 乔艳辉[1] 康新平[1] LI Yan;CHEN Meiqin;QIAO Yanhui;KANG Xinping(Schoolof Chemical Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,Guangdong,China)

机构地区：[1]广东石油化工学院化工学院,广东茂名525000

出　　处：《材料导报》2022年第6期29-34,共6页Materials Reports

基　　金：茂名市科技计划(KJ033);广东省科技创新战略专项资金(2018S00145);国家自然科学基金青年基金(41807337)。

摘　　要：以炼油厂废白土(SBE)、花生壳为原料,采用限氧升温炭化法制备新型碱活化粘土矿物生物炭复合材料(SBE/C)。利用BET、X射线荧光光谱仪(XRF)、SEM、XRD、FTIR对SBE/C进行了表征。考察了溶液初始pH、Pb(Ⅱ)溶液浓度、吸附时间和吸附温度分别对SBE/C吸附Pb(Ⅱ)的影响。研究表明,吸附温度为25℃,Pb(Ⅱ)溶液浓度为100 mg/L,溶液初始pH为6.0,吸附时间约50 min时,SBE/C对Pb(Ⅱ)去除率为92.4%,吸附量为184 mg/g。吸附过程是吸热过程,符合Langmuir方程与准二级动力学模型。连续五次吸附-解吸循环后,SBE/C对Pb(Ⅱ)的去除率仍达到84.6%,表明SBE/C可再生并重复使用。The feasibility of employing a new alkali-activated clay mineral biochar composite produced from simultaneous oxygen-limited pyrolysis of peanut shells biomaterials and spent bleaching earth(SBE)was explored.Product materials were characterized by Brunnet-Emmett-Teller(BET),X-ray fluorescence spectrometer(XRF),scanning electron microscope(SEM),X-ray diffractometer(XRD)and Fourier transform infrared spectrometer(FTIR).The influence of variables like initial metal loading,pH,contact time,and temperature on the adsorptive removal of Pb(Ⅱ)from water was studied,respectively.The adsorption capacity was 184 mg/g with 92.4%of Pb(Ⅱ)removal at 25℃,with contact time of 50 min,solution concentration of 100 mg/L and pH=6.Pseudo-second-order kinetics was the most suitable model for the removal of Pb(Ⅱ),while the equilibrium agreed with Langmuir isotherms.The interaction of SBE/C with the wastewater was endothermic interaction.The Pb(Ⅱ)removal rate of SBE/C could still reach about 84.6%even after five run times,which implied SBE/C possessed reusability.

关 键 词：废白土 花生壳 生物质炭 吸附剂 动力学 

分 类 号：X503[环境科学与工程—环境工程]