镁-铝水滑石处理高氟水研究

含氟工业废水的排放污染水源,长期饮用高氟水引起各种氟中毒疾病。通过简单高效的化学处理方法使含氟水达到国家一级排放标准(10 mg·L^(-1))。以硝酸镁、硝酸铝为原料,尿素为沉淀剂,通过水热法成功制备镁铝层状双氢氧化物(Mg-Al-LDHs)材料。该层状材料经400℃焙烧后,层板有效空间增大,离子吸附性能增强,晶化程度高,结构稳定。考察400℃焙烧后Mg-AlLDHs层状材料对高氟水中氟离子(F!)吸收的影响。实验结果表明Mg/Al物质的量比为2∶1,反应时间为2 h时,F!去除率82. 61%,实现高效除氟。

Study on treatment of high fluorine water by magnesium-aluminum hydrotalcite

Discharge of high fluoride-containing industrial wastewater contaminates water source,and long-term use of high fluoride water causes a variety of fluorosis diseases. Fluorinated water can reach the national first-level emission standard (10 mg·L^-1) by this simple and efficient chemical treatment.Mg-Al-LDHs layered material was synthesized by hydrothermal method with Mg(NO₃)₂,Al(NO₃)₃ as raw material,urea as precipitant.After calcinated at 400 ℃,laminate effective layer space of Mg-Al-LDHs increased,adsorption capacity,crystallinity and structure stability enhanced.Mg-Al-LDHs calcinated at 400 oC was tested for absorption of fluoride ions in high fluoride-containing water.The experimental results showed that when Mg/Al molar ratio was 2∶1,reaction time was 2 h,removal of F^- was 82.61%.This method could remove fluoride efficiently.