摘要
为提高柠檬酸修复土壤重金属离子的能力,设计合成新型绿色柠檬酸基表面活性剂柠檬酸-1-酰胺二乙烯三胺,用FT-IR研究其结构,并探究其表面性能。结果表明,新型绿色柠檬酸基表面活性剂的临界胶束浓度低于柠檬酸,其稳泡力、起泡力及亲水亲油平衡值优于柠檬酸。同时开展表面活性剂浓度、pH值、振荡时间、Ca2+浓度影响表面活性剂对土壤重金属污染去除率的研究,结果表明,柠檬酸-1-酰胺二乙烯三胺对重金属去除率随浓度、振荡时间的增加而升高;随离子强度、pH值的增加而降低。柠檬酸-1-酰胺二乙烯三胺去除Cd2+、Pb2+离子的最佳工艺为:质量分数5.5%,pH值3.0,振荡时间10h,Ca2+离子浓度0.4mol/L。在此条件下,2种表面活性剂对土壤中Cd2+、Pb2+离子去除率均达最大,柠檬酸-1-酰胺二乙烯三胺对Cd2+、Pb2+离子最大去除率分别为69.25%和98.59%,去除效果优于柠檬酸。
In order to improve remediation ability of citric acid for heavy metal ions in the soil, the new type of green citric acid-based surfactants were prepared. Structure of acid-l-amide diethylene triamine was stud- ied by FT-IR, and its superficial performance was studied as well. Results showed that its critical micelle concentration was lower than the citric acid＇ s, while hydrophile-lipophile balance value, foaming and stable foam ability were higher than citric acid＇s. Meanwhile the effect of oscillation time, surfactant concentra- tion, pH and Ca2＋ concentration on removal rate of heavy metal ions in contaminated soil by surfactant were investigated. The results showed that the removal rate of heavy metal ions increased with increasing oscilla- tion time and surfactant concentration, reduced with increasing ionic strength and pH. The optimum technol- ogies of removing Pb2＋ , Cd2＋ ions by the surfactant agents were as follows： The surfactant agent mass con centration was 5.5%, oscillation time was 10 h, pH was 3.0 and mole concentration of Ca2＋ was 0.4 mol/L. Under these conditions, removal rate of Pb2＋ and Cd2＋ ions in the soil by two surfactant agents both reached the maximum. Removal rate of Pb2＋ and Cd2＋ ions by citric aeid-l-amide diethylene triamine was 98. 59 and 69.25%0 respectively, which was better than citric acid＇s.
出处
《水土保持学报》
CSCD
北大核心
2014年第4期252-256,共5页
Journal of Soil and Water Conservation
基金
福建省科技厅重点项目(2013N0030)
福建省服务海西重点项目(2008HX02
2008HX05)
莆田市科技项目(2012S04)
