摘要
采用湿法与干法相结合的方法合成铝改性粉煤灰漂珠环境材料,借助静态吸附实验研究吸附剂量、pH值、离子强度、共存离子、反应时间和温度对其吸附水溶液中砷性能的影响,并进行吸附等温线和动力学拟合.结果表明:铝改性粉煤灰漂珠吸附水中As(V)的最佳pH值范围为中性偏酸;混合离子和H2PO4-对As(V)的吸附影响较大,CO32-次之;离子强度对As(V)吸附的影响不明显;在温度298K、吸附剂量2.5g/L和反应时间24h的条件下,最大吸附容量约5000μg/g;吸附等温线符合Langmuir单层吸附模型;动力学过程符合准二级动力学模型.
An environmental material,aluminum-modified fly ash cenospheres,was synthesized by using composite means of wet and dry method.Static adsorption experiments were conducted to examine the effects of adsorbent dosage,pH,ionic strength,competing anions,reaction time and temperature on As（V） removal from aqueous solutions.Results showed that the best As（V） adsorption was observed in the range of neutral and acidic,and the coexisting ions had a large impact on As（V） adsorption in order comprehensive 〉H2PO4^- 〉CO3^2-,and ionic strength had little influence on As（V） removal,and the maximum adsorption capacity of aluminum-modified fly ash cenospheres is about 5000μg/g（temperature 298K;adsorbent dosage 2.5g/L;time 24h）.Experimental data of As（V） adsorption fitted well with the Langmuir adsorption isotherm and indicated the better applicability of the pseudo-second-order model.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2011年第8期1300-1305,共6页
China Environmental Science
基金
污染控制与资源化研究国家重点实验室基金
南京大学研究生创新基金项目
关键词
粉煤灰漂珠
铝改性粉煤灰漂珠
五价砷
吸附
fly ash cenospheres
aluminum-modified fly ash cenospheres
pentavalent arsenic
adsorption
