摘要
以生物废料橘子皮(OP)为原料,经乙醇、NaOH和CaCl2处理,得到皂化交联改性橘子皮(SCOP)生物吸附剂,将其用于对重金属离子Cu2+、Pb2+、Cd2+、Zn2+和Ni 2+的吸附,并研究了溶液pH、吸附时间和重金属离子初始浓度对SCOP吸附性能的影响。结果表明,重金属离子在改性橘子皮上的吸附速率快,符合准二级动力学方程;改性橘子皮对Cu2+、Pb2+、Zn2+和Ni 2+的吸附等温线符合Langmuir方程,对Cd2+的吸附等温线符合Freundlich方程,根据Langmuir方程计算对Cu2+、Pb2+、Cd2+、Zn2+和Ni 2+的饱和吸附量分别为72.73、209.80、85.84、56.18、33.80mg/g,均高于改性前。改性后的橘子皮生物吸附剂可以再生重复使用4次以上,是性能良好的重金属离子吸附剂。
Orange peel was chemically modified by ethanol, sodium hydroxide and calcium chloride. The ob tained saponification and crosslinking orange peel （SCOP） was used as biosorbent for adsorbing the heavy metal ions （Cu2＋, Pb2＋, Cdz＋, Znz＋ and Niz＋） in aqueous solution. The effect of solution pH, initial ion concentration and contacting time on adsorption capacity of SCOP was investigated. Results showed that the adsorption of heavy metal ions on SCOP was rapid and the dynamic adsorption data could be well described by pseudosecond order kinetics. Langmuir isotherms model fitted the Cuz＋ , Pbz＋ , Znz＋ and Niz＋ adsorption data better than Freundlich isotherms model, which was better for fitting the Cdz＋ adsorption data. According to the Langmuir equation, the maximum ad sorption capacities of SCOP for Cu2＋ , Pbz＋ , Cd2＋ , Znz＋ and Niz＋ were 72.73,209.80,85.84,56.18 and 33.80 mg/g respectively, which were higher than that of untreated OP. The SCOP could be recycled for four times with little loss of adsorption capacity, it was the potential adsorbent for heavy metal adsorption.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第9期19-23,27,共6页
Environmental Pollution & Control
基金
宁夏自然科学基金资助项目(No.NZ1083)
关键词
改性橘子皮
重金属离子
吸附
modified orange peel heavy metal ions adsorption
