花生壳生物炭对Pb^(2+)和Cu^(2+)的吸附及影响因素分析  

Analysis of Performance and Influencing Factors of Pb^(2+) and Cu^(2+) Adsorption by Peanut Shell Biochar

作　　者：刘立[1] 赵美花[1] 张朝升[1] 许莹[1] 蔡彩媛 LIU Li;ZHAO Mei-hua;ZHANG Chao-sheng;XU Ying;CAI Cai-yuan(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《中国给水排水》2018年第17期58-62,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51609042;21477027);广东省科技计划项目(2014A020216048)

摘　　要：以花生壳生物炭为吸附材料,通过批量试验探究了pH值、生物炭投加量、初始重金属离子浓度、吸附时间对生物炭吸附Pb^(2+)和Cu^(2+)的影响,并利用Langmuir和Freundlich等温吸附模型、准一级和准二级吸附动力学模型分别进行等温吸附和吸附动力学分析。结果表明,花生壳生物炭吸附Pb^(2+)和Cu^(2+)的适宜pH值分别为4. 5～5. 5和5～6。在Pb^(2+)和Cu^(2+)的初始浓度分别为100和75 mg/L,花生壳生物炭投加量分别为2和6. 25 g/L,吸附时间分别为480和900 min条件下,Pb^(2+)和Cu^(2+)达到吸附平衡时的吸附量分别为49. 32和11. 35 mg/g,且吸附过程符合Langmuir等温吸附模型和准二级吸附动力学模型。同时发现,花生壳生物炭能更快更好地吸附Pb^(2+)。The effects of pH value, biochar dosage, initial concentration of heavy metal ion, and adsorption time on the adsorption of Pb2＋ and Cu2＋ by peanut shell biochar were studied. The Langmuir and Freundlieh isothermal adsorption model, the pseudo-first-order and pseudo-second-order adsorption kinetics models were utilized to analyze the processes of isothermal and kinetic adsorption, respectively. Results showed that the suitable solution pH for the adsorption of Pb2 ＋ and Cu2 ＋ was 4.5 - 5.5 and 5 - 6 respectively. When the initial concentrations of Pb2＋ and Cu2＋ were 100 mg/L and 75 mg/L, the pea- nut shell biochar dosages were 2 g/L and 6.25 g/L, and the adsorption times were 480 min and 900 min, the adsorption capacities were 49.32 mg/g and 11.35 mg/g, respectively. Furthermore, the ad- sorption process was fitted well by the Langmuir isothermal adsorption model and the pseudo-second-order adsorption kinetics model. The peanut shell biochar demonstrated high efficiency in the adsorption of pb2＋.

关 键 词：花生壳生物炭 铅 铜 等温吸附模型 吸附动力学模型 

分 类 号：TU992.3[建筑科学—市政工程]