摘要
文章主要考察实验室制得的乙二胺改性磁性壳聚糖微球对毒性高,迁移能力强的A(sⅢ)去除效果。通过单因素实验研究了pH值、吸附时间、A(sⅢ)溶液初始浓度和吸附剂投加量对磁性壳聚糖微球吸附除A(sⅢ)效果的影响。实验结果表明在pH值为2,吸附时间为90 min,磁性壳聚糖微球投加量为0.4 g时,对初始浓度为10 mg/L,体积为100 mL的A(sⅢ)溶液去除率达到96.96%,吸附后溶液中A(sⅢ)浓度仅为0.304 mg/L,低于我国污水综合排放标准中砷含量标准值。磁性壳聚糖微球的解吸实验表明,吸附剂解吸4次后,对A(sⅢ)的去除率仍达到95%以上,吸附性能稳定,具有较好的可重复利用性。因此,磁性壳聚糖微球是一种去除低浓度含砷废水非常有效的材料。
This paper is aimed to investigate the efficiency of lab-synthetic magnetic chitosan microspheres for removing As（Ⅲ）,which is highly toxic and has strong migrative ability in aqueous solution.The singlefactor experiments were conducted to study the adsorption effect.The factors that may affect the adsorption performance were discussed,such as pH value of solution,adsorption time,initial concentration of As3＋ and dosage of magnetic chitosan microspheres.Experimental results showed that the factors played an important role in adsorption.It was observed that the removal rate of As（Ⅲ） was 96.96% with reaction conditions of pH value 2,adsorption time 90 minutes,initial concentration of As3＋ 10mg/L,volume of aqueous solution 100 mL and dosage of magnetic chitosan microspheres 0.4 g.The concentration of arsenic had far exceeded Integrated Wastewater Discharge Standard（GB 8978-1996）.Desorption experiment was also carried out.Experimental results demonstrated that magnetic chitosan microspheres could be desorbed very well with 0.1 mol/L NaOH,with removal rate up to 95% after regeneration four times.Due to its unique characteristics of fast adsorption rate,high removal efficiency,good stability and strong regeneration,magnetic chitosan microspheres were expected to be an ideal candidate for the treatment of arsenic contained water with low concentration.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第6期76-79,共4页
Environmental Science & Technology
基金
湖南省科技厅项目资助(2008FJ3087)
湖南省市政工程重点学科专业基金项目资助(湘教通[2006]30号)
关键词
磁性壳聚糖微球
As(Ⅲ)
吸附
研究
magnetic chitosan microspheres
As（Ⅲ）
adsorption
research
