摘要
利用N-羧甲基壳聚糖吸附锰矿废水中Mn2+,通过考察吸附剂质量浓度、溶液pH、吸附温度及时间的影响,采用L16(45)正交试验确定吸附10.6 mg/L Mn2+废水的最佳工艺条件为:30.0 mg/m L N-羧甲基壳聚糖,在溶液pH=5.5、65℃下,振摇吸附8.5 h,Mn2+去除率99.1%,吸附后废水中Mn2+浓度0.095 mg/L,满足国家规定地表水锰含量要求,吸附过程符合Langmiur吸附特征,属于单分子层吸附。由于N-羧甲基壳聚糖吸附锰矿废水中Mn2+工艺简便、吸附效率高,从而可为相关行业的水污染处理提供理论基础。
The manganese ions in manganese industry wastewater was adsorbed by N-carboxymethyl chitosan, and the influence factors including adsorbent mass concentration, pH, temperature and adsorption time were investigated. The optimum adsorption conditions for wastewater with the manganese content of 10.6 mg/L were determined by L16(45) orthogonal test as follows: adsorbent N-carboxymethyl chitosan 30.0 mg/m L, pH=5.5 and temperature 65 °C, adsorption time 8.5 h. The adsorption experiment results show that, under the optimum adsorption conditions, the N-carboxymethyl chitosan adsorption rate is 99.1%, and the residual manganese content is 0.095 mg/L, which can meet the demand of manganese content of surface water. The adsorption process fits with Langmiur characteristics which belongs monomolecular layer adsorption.
引文
[1]李秀萍,赵荣祥.二氧化锰纳米棒的制备和催化性能研究[J].当代化工,2011,40(1):33-35.
[2]高俊,盛光遥,邱宇平.新型树脂基水合锰氧化物对水体中磺胺嘧啶的降解去除[J].高等学校化学学报,2012,33(5):948-953.
[3]梁高飞,林常青,于艳,等.高强塑性高锰钢的研究进展[J].铸造技术,2009,30(3):105-108.
[4]李树索,陈希杰.超高锰钢加工硬化及耐磨性的研究[J].钢铁研究学报,1997,9(4):38-41.
[5]李霞,张小平,喻晓,等.代森锰锌类农药对生姜种植地土壤酶活性及微生物群落结构的影响[J].生态环境学报,2016,25(9):1569-1574.
[6]李晓红.68.75%噁酮锰锌水分散粒剂对黄瓜褐斑病的防治效果[J].中国蔬菜,2016(3):66-68.
[7]胡存丽,李忠.锰中毒诊断和治疗研究进展[J].中国工业医学杂志,1999,12(6):363-365.
[8]国家环保总局,地表水环境质量标准[S].GB3838-2002,2002.
[9]卓大权,李思东,李楚燕,等.羧甲基壳聚糖吸附废水中锌离子工艺的优化[J].化学研究,2015,26(4):394-397.
[10]罗序燕,祝婷,夏勇,等.羧甲基壳聚糖对Nd3+的吸附性能[J].材料保护,2016,49(7):83-85.
[11]刘志江,张东.纳米钛酸锶钡粉体吸附富集-火焰原子吸收光谱法测定水样中锰离子[J].理化检验:化学分册,2010,46(1):32-33.
[12]Ramesh A,Hasegawa H,Sugimoto W,et al.Adsorption of gold(III),platinum(IV),and palladium(II)onto glycine modified crosslinked chitosan resin[J].Bioresource Technol,2008,99(9):3801-3809.