成型秸秆炭吸附剂对水中Cd^(2+)的去除特性  

Removal characteristics of Cd^(2+) applied in straw molding carbon adsorbent

作　　者：冯康[1] 王黎明[1] 王妍玮[2] 赵亚杰[1] 曲庆峰[1] FENG Kang WANG Liming WANG Yanwei ZHAO Yajie QU Qingfeng(College of Engineering, Heilongjiang Bayi Agricultural University, Daqing 163319, China Harbin Institute of Petroleum, Harbin 150027, China)

机构地区：[1]黑龙江八一农垦大学工程学院,大庆163319 [2]哈尔滨石油学院,哈尔滨150027

出　　处：《环境工程学报》2017年第10期5424-5428,共5页Chinese Journal of Environmental Engineering

基　　金：黑龙江省教育厅项目(12511357)

摘　　要：以水稻秸秆为原料,制取对Cd^(2+)去除效果最佳的成型生物炭吸附剂。采取限氧升温方法,分析不同热解温度和不同热解时间的成型炭对Cd^(2+)去除规律和特性。研究结果表明:热解温度不变,热解时间90 min去除率最大;热解时间不变,热解温度550℃时去除率最大;去除速率分快、慢两阶段,快阶段2 h内去除率最低达到76.83%,慢阶段10 h去除率仅20%左右;该成型炭对Cd^(2+)吸附规律可用准二级动力模型进行拟合,拟合度R_(max)~2=0.987 2,该成型炭对Cd^(2+)吸附不是单层吸附过程,而存在大量的阳离子交换量,化学反应较强烈。In order to removing Cd^2＋,the effective molding carbon adsorbent is available by rice straw..It applies Limited-oxygen technique to changing temperatures.It also helps to analyze Cd^2＋ removing characteristics and rules of molding carbon between different temperatures and various pyrolyzation times.The results show that when the pyrolyzation temperature is fixed,the removal rate is maximal for the pyrolyzation time is 90 mins; as the pyrolyzation time is constant,the maximal removal rate happens when the pyrolyzation temperature is 550 ℃.The whole process of removal rate is divided into fast and slow stages,and the least removal rate reaches 76.83 in 2 h for fast state,while only 20% in 10 h for slow progress.The quasi two stage dynamic mode is adopted to fit the adsorption role of Cd^2＋onto carbon,the fitting value R_（max）~2 is equal to 0.987 2,The result indicates that Cd^2＋adsorption on the formed carbon is not simple mono layer adsorption process,but a lot of cation exchange exists with strong chemical reactions.

关 键 词：吸附剂 重金属 成型炭 热解 

分 类 号：X53[环境科学与工程—环境工程]