摘要
以麦草为原料、以三乙胺和氯乙酸分别为氨基和羧基官能团接枝反应剂,制备秸秆基两性吸附剂;以产品对Cu(II)和Cr(VI)的去除效果为指标,考察了合成过程中单一影响因素,并结合正交实验得出优化改性条件。结果表明,氯乙酸投加量是影响两性秸秆改性效果的主要因素,温度的影响最小;优化改性条件为:当固定阳离子型麦草秸秆投加量为6.69g时,氢氧化钠投加量、氯乙酸投加量、反应温度和反应时间分别为5mL、3.402g、60℃和2.5h。该吸附剂对Cu(Ⅱ)和Cr(Ⅵ)的最大吸附量可达到90.9和241.1mg/g。
Wheat straw was modified into amphoteric adsorbent for the removal of Cu(Ⅱ) and Cr(Ⅵ) by using triethylamine and chloroacetic acid as amine and carboxyl grafting reaction reagent,respectively.The conditions for modification were optimized based on the removal efficiencies of Cu(Ⅱ) and Cr(Ⅵ) from aqueous solution by single factor experiments and orthogonal tests.Results showed that the amount of chloroacetic acid was the key effect factor on the modification.The optimal conditions for preparation of the amphoteric adsorbent were VNaOH(40(wt) %)= 5mL and Wchloroacetic acid= 3.402 g at 60℃ for 2.5h.The maximum sorption capacities of Cu(Ⅱ) and Cr(Ⅵ) were 90.9 and 241.1mg /g,respectively.
出处
《化学通报》
CAS
CSCD
北大核心
2014年第5期425-429,共5页
Chemistry
基金
国家自然科学基金项目(50878121
21007034)
济南市高校自主创新项目资助
