文献类型：期刊文献

中文题名：芦苇秸秆生物炭对水体中重金属Ni^(2+)的吸附特性

英文题名：Adsorption behaviors of Ni^(2+) onto reed straw biochar in the aquatic solutions

作者：吴晴雯[1,2];孟梁[2];张志豪[3];罗启仕[2]

机构：[1]华东理工大学资源与环境工程学院,上海200237;[2]上海市环境科学研究院,上海200233;[3]华东理工大学中德工学院,上海200237

年份：2015

卷号：34

期号：9

起止页码：1703

中文期刊名：环境化学

外文期刊名：Environmental Chemistry

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：上海市自然科学基金(13ZR1460200);国家自然科学基金(41401357);国家高技术研究发展计划(SS2013AA062608);上海市环保局青年基金(沪环科2014-105);上海市环境科学研究院科技创新项目(CX201407)资助

语种：中文

中文关键词：芦苇生物炭;镍;等温吸附;吸附动力学;pH

外文关键词：biochar; Ni2＋; adsorption isotherm model; kinetic model; pH;

摘要：本实验选用由芦苇秸秆制备的生物炭,通过研究吸附等温线、吸附动力学以及生物炭投加量和溶液p H对生物炭吸附Ni2+的影响,以确定其对水体中Ni2+的吸附特性.结果表明,Ni2+初始浓度在0.5—12 mg·L-1范围内,Langmuir模型能很好地描述生物炭对Ni2+的等温吸附规律,其理论饱和吸附量为12.10 mg·g-1,与实际饱和吸附量11.93 mg·g-1相近.生物炭对Ni2+的吸附动力学过程符合准二级动力学模型,通过颗粒内扩散方程可得具体吸附过程由膜扩散和内扩散共同控制.随投加量增加,生物炭对Ni2+的吸附量下降,而去除率则上升,当投加量>30 mg时,Ni2+的去除率接近100%.溶液p H值在1—12范围内,Ni2+的去除率随p H值的升高而增加,当p H>10时,Ni2+的去除率同样接近100%.
Adsorption isotherm, kinetics and influcing factors such as biochar mass and solution pH were investigated to determine the adsorption characteristics of Ni2＋ onto reed straw biochar in aqueous solution. The results showed that the adsorption isotherm of Ni2＋ onto biochar could be well described by Langmuir model with Ni2＋concentration between 0.5 mg·L-1 and 12 mg·L-1, and the theoretical maximum adsorption was 12.10 mg·g-1 , which was in good accordance to the experimental value （11.93 mg·g-1）. The adsorption process could be well fitted by pseudo-second？order model, and through intraparticle diffusion model, the specific process was controlled by both membrane diffusion and internal diffusion. With increasing biochar mass, Ni2＋ adsorption decreased but its removal rate increased. When the mass was above 30 mg, the removal rate approached 100%. In the pH range of 1—12, the removal rate of Ni2＋ enhanced significantly with increasing pH in aqueous solution. When the pH was above 10, the removal rate also approached 100%.