粤西徐闻九亩硅藻土对水体中Zn^(2+)的吸附实验研究

Experiment study of absorbing Zn^(2+) in water by diatomite from Jiumu,Xuwen Town,western Guangdong

粤西徐闻九亩硅藻土表面多孔,除含有蛋白石外,还含有少量的蒙脱石等粘土矿物;其对水体中的Zn2+具有修复能力,且对Zn2+的吸附效率较高;宜在弱酸性-中性的pH值条件下修复Zn2+;在低Zn2+浓度下,硅藻土可以有效地去除Zn2+,而对硅藻土进行改性后将有利于对较高浓度的Zn2+进行修复;评价硅藻土对水体中Zn2+的修复效果应该综合考虑去除率与负载量,在Zn2+初始浓度为20m g/L时,徐闻九亩硅藻土吸附剂的用量应以10g/L为宜。

The diatomite mineral in Xuwen and Jiumo of western Guangdong is porous on the surface. It contains less clay mineral as montomorillonite etc. besides opal. It is able to restore Zn^2＋in water and effectively absorb Zn^2＋. It is fit for restoring Zn^2＋ in weak acid and neutral pH condition. Diatomite can eliminate Zn^2＋ effectively when Zn^2＋concentration is lower, while highly concentrated Zn^2＋can be restored after diatomite being modified; The removing rate and loading quantity should be considered comprehensively while evaluating the diatomite＇s effect of restoring Zn^2＋ in water. When the initial concentration of Zn^2＋ is 20mg/L, the suitable dosage of diatomite sorbent in Xuwen and Jiumu should be 10g/L.