摘要
以壳聚糖、苯甲醛、二硫化碳、氢氧化钠和硼氢化钠为原料制备出O-黄原酸化-N-苄基壳聚糖(RXCTS),采用单因素法确定了RXCTS的制备条件,利用正交试验法考察了RXCTS处理含Cu2+水样的最佳絮凝水力条件,并研究了水样pH值、Cu2+初始浓度以及浊度对RXCTS除Cu2+性能的影响。结果表明,RXCTS相对于XCTS除Cu2+效果更好,投药量更少,Cu2+的最高去除率可达98.76%。絮凝最佳水力条件为:快搅时间2.0 min,快搅速度160 r/min,慢搅时间20 min,慢搅速度50 r/min。体系pH值和Cu2+初始浓度对RXCTS除Cu2+均有一定的影响,总体上Cu2+的最高去除率随着水样中Cu2+初始浓度和pH值的增大而升高。RXCTS对Cu2+和浊度均有良好的去除能力,共存浊度一定程度上可促进Cu2+的去除。红外光谱表明RXCTS中伯胺基被还原为仲胺基。
O-xanthogenated-N-benzyl chitosan(RXCTS) was prepared with chitosan, benzaldehyde, carbon disulfide and sodium hydroxide. The preparation conditions of RXCTS were determined by single factor method. The optimum flocculation conditions for RXCTS treatment of copper-containing water samples were investigated by orthogonal experiment, and the influence of pH, Cu2+initial concentration and turbidity on the copper removal performance for RXCTS was investigated. The results showed that the prepared RXCTS had better efficiency for copper removal than XCTS, and the dosage was less. The highest removal rate of Cu2+was 98.76%. The optimal hydraulic conditions for flocculation were the time for rapid stirring 2.0 min at speed of 160 r/min, and the time for slow stirring 20 min with 50 r/min. Both pH value and the initial concentration of Cu2+had a certain effect on the removal of Cu2+with RXCTS. In general, the maximum removal rate of Cu2+increased with the increase of p H and the initial concentration of Cu2+in the water samples. RXCTS had a good ability to remove both Cu2+and turbidity, and the co-existence of turbidity could promote the removal of Cu2+to a certain extent. IR spectra showed that the primary amine groups in RXCTS were reduced to secondary amine groups.
作者
赵燕侠
王刚
杨凯
陈学民
ZHAO Yanxia;WANG Gang;YANG Kai;CHEN Xuemin(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2019年第8期169-174,共6页
Environmental Science & Technology
基金
国家自然科学基金项目(51368030)
关键词
高分子絮凝剂
壳聚糖
还原作用
含铜废水
macromolecule flocculant
chitosan
reduction action
copper-containing wastewater
