改性二氧化钛纳米管对水体中磷的吸附  

Adsorption of phosphate from aqueous solution by modified titanium oxide nanotubes

作　　者：商丹红[1] 郦昱丞 张志生[1] 

机构地区：[1]江苏科技大学环境与化学工程学院,镇江212018

出　　处：《环境工程学报》2016年第3期1322-1327,共6页Chinese Journal of Environmental Engineering

摘　　要：利用硝酸铁对二氧化钛纳米管进行改性,并研究了改性二氧化钛纳米管对水中磷的吸附能力及吸附特征。结果表明,通过对二氧化钛纳米管的改性,提高了其对水中磷的吸附能力,磷去除率随着改性二氧化钛纳米管投加量的增加而提高,原水p H值对磷去除率影响不大;温度升高,磷去除率有所提高。进一步研究表明,改性二氧化钛纳米管对磷的吸附是一个快速吸附过程并可用准二级动力学模型进行很好的描述;热力学研究表明,改性二氧化钛纳米管对磷的吸附符合Freundlich等温吸附模型,ΔG0<0和ΔH0>0说明吸附反应是自发的吸热反应。Modified titanium oxide nanotubes（ Ti NT） were successfully prepared by reacting Ti NT with iron nitrate. The adsorption efficiency of Ti NT for phosphate removal from wastewater was evaluated. The effects of the initial pH value,adsorbent dosage,and temperature on the phosphate removal rate were systematically studied. The results showed that the phosphate-uptake capacity of the modified Ti NT was improved compared to that of unmodified Ti NT. The removal rate of phosphate increased with increasing adsorbent dosage and temperature. The initial pH value had a slight effect on phosphate removal. The adsorption isotherm of phosphate removal by modified Ti NT fitted well with the Freundlish isotherm model and the adsorption reaction was an easily spontaneous endothermic process,because ΔG^0〈 0 and ΔH^0〉 0. In addition,adsorption kinetics showed that the adsorption of phosphate on modified Ti NT was a fast adsorption process that was well-described by a pseudosecond-order model.

关 键 词：二氧化钛纳米管 磷 硝酸铁 动力学 热力学 

分 类 号：X703.1[环境科学与工程—环境工程]