[1]兰 天,张 辉,刘 源,等.玉米秸秆生物炭对Pb2+、Cu2+的吸附特征与机制[J].江苏农业学报,2016,(02):368-375.[doi:10.3969/j.issn.1000-4440.2016.02.021]
　LAN Tian,ZHANG Hui,LIU Yuan,et al.Adsorption characteristics and mechanisms of Pb2+ and Cu2+ on corn straw biochar[J].,2016,(02):368-375.[doi:10.3969/j.issn.1000-4440.2016.02.021]
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玉米秸秆生物炭对Pb2+、Cu2+的吸附特征与机制()
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江苏农业学报[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2016年02期
页码:
368-375
栏目:
耕作栽培·资源环境
出版日期:
2016-03-20

文章信息/Info

Title:
Adsorption characteristics and mechanisms of Pb2+ and Cu2+ on corn straw biochar
作者:
兰 天1; 2;  张 辉3;  刘 源1; 3;  赵 文1;  张玲玲1;  朱治强1;  吴蔚东1
1.海南大学热带作物种质资源保护与开发利用教育部重点实验室,海南 海口 570228; 2. 海南省耕地保育重点实验室,海南 海口 571100; 3. 江苏省农业科学院农业资源与环境研究所,江苏 南京 210014
Author(s):
LAN Tian1; 2;  ZHANG Hui3;  LIU Yuan1; 3;  ZHAO Wen1;  ZHANG Ling-ling1;  ZHU Zhi-qiang1;  WU Wei-dong1
1.Key Laboratory of Protection and Utilization of Tropical Crop Germplasm Resources,Ministry of Education,Hainan University,Haikou 570228,China; 2. Hainan Key Laboratory of Arable Land Conservation, Haikou 571100, China; 3.Institute of Agricultural Resource and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014,China
关键词:
生物炭;  铅;  铜;  单一污染;  复合污染;  吸附
Keywords:
biochar;  Pb2+;  Cu2+;  single pollution;  compound pollution;  adsorption
分类号:
X53
DOI:
10.3969/j.issn.1000-4440.2016.02.021
文献标志码:
A
摘要:
以玉米秸秆为原料,在350 ℃、低氧条件下热解制备生物炭,考察了吸附时间、重金属离子的初始浓度、溶液的初始pH值等因素对生物炭吸附Pb2+、Cu2+特征的影响。结果表明,准二级动力学方程能很好地反映低浓度条件下玉米秸秆生物炭对单一、复合污染溶液中Pb2+、Cu2+的吸附过程,玉米秸秆生物炭对单一、复合污染溶液中Pb2+、Cu2+的吸附以化学吸附为主。Langmuir模型能够更好地描述单一污染条件下玉米秸秆生物炭对Pb2+的吸附行为,而对于单一污染条件下Cu2+以及复合污染条件下Pb2+、Cu2+离子的等温吸附,Freundlich模型明显优于Langmuir模型。当溶液pH值从3上升到4时,玉米秸秆生物炭对单一污染条件下Pb2+的去除率明显增加,当溶液的初始pH达到6时玉米秸秆生物炭对单一、复合污染条件下Pb2+、Cu2+离子去除率的增长趋势逐渐平缓。通过连续解吸试验发现,不同初始浓度下(0～400 mg/L)各种吸附方式对吸附总量的贡献率会不断变化,低浓度条件下以氢键吸附为主,随着初始浓度的上升,物理吸附的贡献率不断升高,取代了氢键吸附的主导地位。
Abstract:
Adsorption behaviors of Pb2+ and Cu2+ on corn straw biochar affected by initial solution pHs,adsorption time durations,and initial heavy metal concentrations were investigated. The process of Pb2+ and Cu2+ adsorbed on biochar in the solution with single or compound pollution followed the pseudo-second-order kinetics model under low initial concentrations, which was characterized by chemical adsorption. The adsorption of Pb2+ by biochar in single pollution solution fitted Langmuir model, while for the adsorption of Cu2+ in signal pollution solution or Pb2+and Cu2+ in compound pollution solution, Freundlich model performed better. The removal rate of metals was elevated dramatically when the initial pH of single polution solution increased from 3 to 4, except for Cu2+. When the initial pH climbed beyond 6, the removal rates of Pb2+ and Cu2+ increased slowly. The sequential desorption test indicated that adsorption manners varied with the initial concentrations. The hydrogen bonding dominated the adsorption under low initial concentration of heavy metal, however the contribution of physical adsorption increased with initial concentration.

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备注/Memo

备注/Memo:
收稿日期:2015-10-17 基金项目:国家自然科学基金项目(21467007); 海南省耕地保育重点实验室(筹建)开放资金项目(KFZJ20150203) 作者简介:兰 天(1992-),男,内蒙古凉城人, 硕士,主要从事土壤污染修复与研究工作。(E-mail)lantiancnnm@163.com 通讯作者:吴蔚东,(E-mail)wdwu@hainu.edu.cn
更新日期/Last Update: 2016-03-20