季铵盐改性蒙脱土对景观水硅藻和蓝藻的去除

Removal of diatoms and cyanobacteria in landscape water by modified montmorillonite with quaternary ammonium salt

以十六烷基三甲基溴化铵(CTAB)季铵盐为表面活性剂制备改性蒙脱土,并用FT-IR进行表征分析,考察其对景观水体中不同藻类的去除作用.结果表明CTAB季铵盐已插入蒙脱土的层间,其改性蒙脱土去除硅藻的最优条件组合是:质量浓度30mg/L,温度25℃,pH=6,时间36h;改性蒙脱土去除蓝藻的最优条件组合是:质量浓度40mg/L,温度35℃,pH=7,时间24h.最优条件下CTAB季铵盐改性蒙脱土在对硅藻的去除率比未改性原土提高了20.73%,对蓝藻的去除率比未改性原土提高了22.89%.

The modified montmorillonite is prepared by taking CTAB quaternary ammonium salt as surfactant, and its characterization is analyzed by FT-IR. The removal of different algae in landscape water was studied. The results show that CTAB quaternary ammonium salt is successfully intercalated into the interlayer of montmorillonite. The optimum conditions for CTAB-modified montmorillonite to remove diatoms are as follows：concentration is 30 mg/L, temperature 25 ℃, pH=6, time 36 h. The optimum conditions for CTAB-modified montmorillonite to remove cyanobacteria are as follows：concentration is 40 mg/L, temperature 35 ℃, pH=7, time 24 h.Under the optimum conditions, the removal efficiency of diatoms in CTAB modified montomorillonite is higher than that of unmodified montomorillonite by 20.73%, the removal efficiency of cyanobacteria in CTAB modified montomorillonite is higher than that of unmodified montomorillonite by 22.89%.