Mg/Al水滑石对铜绿微囊藻的去除性能

 目前用于除藻的黏土矿物表面带负电荷，需通过改性提高黏土矿物的除藻能力，而改性材料会导致成本增加、产生二次污染等，因此研究了直接用表面带正电荷的黏土矿物进行除藻的可行性。通过共沉淀法制备Mg/Al 水滑石，并用其进行去除铜绿微囊藻的实验研究，探究了吸附剂用量、搅拌时间、铜绿微囊藻初始浓度以及pH 值对Mg/Al 水滑石去除铜绿微囊藻的影响。结果表明，吸附剂用量为1 g/L、搅拌1.5 h、pH=6~11 是Mg/Al 水滑石除藻的最佳条件；Mg/Al 水滑石对质量浓度为0.5~3.0 mg/L的铜绿微囊藻具有较高的去除率。

Microcystis aeruginosa Removal Capacity of Mg-Al Hydrotalcite

As most clay minerals are negatively charged, they need to be modified to improve the algae removal capacity, which, however, leads to increased cost and secondary pollution. Therefore, this paper explores the feasibility to use positively charged clay minerals for algae removal. Mg/Al hydrotalcite (Mg/Al-LDH) was synthesized by co-precipitation method and its calcination product (Mg/Al-LDO) was prepared by heating Mg/Al-LDH at 400℃. To know the practical applicability, a detailed study of Microcystis aeruginosa removal was carried out. The influences of sorbent concentration, stirring time, solution pH, and initial Microcystis aeruginosa concentration were investigated. The results indicate that the removal of Microcystis aeruginosa was the highest using 1 g/L of Mg/Al-LDO under pH 6-11 with stirring time of 1.5 h. Mg/Al-LDO had relatively high removal capacities at the initial Microcystis aeruginosa concentration range of 0.5~3.0 mg/L.