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腐殖酸对生物炭去除水中Cr(Ⅵ)的影响机制研究
引用本文:丁文川,田秀美,王定勇,曾晓岚,徐茜,陈健康,艾小雨.腐殖酸对生物炭去除水中Cr(Ⅵ)的影响机制研究[J].环境科学,2012,33(11):3847-3853.
作者姓名:丁文川  田秀美  王定勇  曾晓岚  徐茜  陈健康  艾小雨
作者单位:1. 西南大学资源环境学院,重庆400715 重庆大学三峡库区生态环境教育部重点实验室,重庆400045
2. 西南大学资源环境学院,重庆,400715
基金项目:重庆市自然科学基金项目(CSTC,2011BB7098);中央高校基本科研业务费专项(CDJXS11210013)
摘    要:以污泥生物炭作吸附剂处理水中Cr(Ⅵ),研究了共存腐殖酸对生物炭吸附性能影响.结果表明,腐殖酸能显著促进生物炭对Cr(Ⅵ)的吸附,大幅提高吸附量以及缩短吸附平衡时间,生物炭吸附过程符合准二级动力学模型.在溶液初始pH4.0,生物炭浓度20 g·L-1,Cr(Ⅵ)初始浓度在50~800 mg·L-1范围下,Langmuir模型比Freundlich模型更好地描述等温吸附行为.加入腐殖酸(20 mg·L-1)后拟合得到的理论饱和吸附量达10.10 mg·g-1,较未加入腐殖酸的吸附量5.56 mg·g-1提高近1倍.在pH 2.0~8.0范围内,吸附量随溶液初始pH值升高而减小.腐殖酸浓度上升,生物炭吸附能力进一步提高.红外光谱显示,生物炭表面的羟基、羧基、酯基、芳香环上C—H和环状结构上的CC等化学活性官能团与Cr(Ⅵ)的吸附有关.结合XPS分析结果,推断腐殖酸共存促进生物炭吸附的机制是:腐殖酸提高了Cr(Ⅵ)在生物炭表面聚集浓度,有利于生物炭对Cr(Ⅵ)的直接吸附和还原,而腐殖酸本身具有的吸附能力增加了对溶液中Cr(Ⅵ)和Cr(Ⅲ)的去除.

关 键 词:生物炭  六价铬  腐殖酸  吸附  还原作用  重金属  污泥
收稿时间:2012/1/15 0:00:00
修稿时间:4/8/2012 12:00:00 AM

Mechanism of Cr(Ⅵ) Removal from Aqueous Solution Using Biochar Promoted by Humic Acid
DING Wen-chuan,TIAN Xiu-mei,WANG Ding-yong,ZENG Xiao-lan,XU Qian,CHEN Jian-kang and AI Xiao-yu.Mechanism of Cr(Ⅵ) Removal from Aqueous Solution Using Biochar Promoted by Humic Acid[J].Chinese Journal of Environmental Science,2012,33(11):3847-3853.
Authors:DING Wen-chuan  TIAN Xiu-mei  WANG Ding-yong  ZENG Xiao-lan  XU Qian  CHEN Jian-kang and AI Xiao-yu
Institution:College of Resources and Environment, Southwest University, Chongqing 400715,China;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045,China;College of Resources and Environment, Southwest University, Chongqing 400715,China;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045,China;College of Resources and Environment, Southwest University, Chongqing 400715,China;College of Resources and Environment, Southwest University, Chongqing 400715,China;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045,China;College of Resources and Environment, Southwest University, Chongqing 400715,China;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045,China;College of Resources and Environment, Southwest University, Chongqing 400715,China;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045,China;College of Resources and Environment, Southwest University, Chongqing 400715,China;Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045,China
Abstract:
Keywords:biochar  hexavalent chromium  humic acid  adsorption  reduction  heavy metal  sludge
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