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采用共沉淀法制备了镧渗杂的纳米镁铝层状双氢氧化物材料(LDHs),获得了一类对氟具有选择性的新型吸附材料.实验表征了LDH、其焙烧产物(LDOs)以及吸附氟后的材料(F-LDHs)的微观形态、体相组成等性质的变化,通过批处理试验和吸附柱试验对其工艺特性及影响因素进行了深入分析.实验结果表明,材料经600℃焙烧10min,在含200mg.l-1SO42-,氟浓度为10mg.l-1的配水中投加0.1gLDOs吸附240min,最高除氟率可达93.53%;在含200mg.l-1SO42-的氟溶液中,镁铝铜LDOs吸附氟的容量高于镁铝LDOs;吸附柱实验中,14h时出水氟含量小于国家标准(1mg.l-1);共存阴离子对材料的除氟干扰强度排序为:CO32->PO43->NO3->Cl-.材料吸附氟后可用0.5mg.l-1的Na2CO3洗脱,并经600℃焙烧10min再生,再生4次后选择性除氟效果稳定.
Lanthanum-doped Mg-Al layered double hydroxide (LDHs) materials were prepared by co-precipitation method, and a new class of fluorine-selective adsorbents was obtained. LDH, LDOs, (F-LDHs) were investigated by means of batch test and adsorption column test, the process characteristics and influencing factors were analyzed in depth.The experimental results show that the material is stable at 600 ℃ Roasting 10min, containing 200mg.l-1SO42-, fluorine concentration of 10mg.l-1 water dosing 0.1gLDOs adsorption 240min, the maximum rate of up to 93.53% fluoride; in 200mg.l-1SO42- containing fluorine solution , The capacity of Mg-Al-Cu LDOs to adsorb fluorine was higher than that of Mg-Al-LDOs. The concentration of fluorine in effluent was less than the national standard (1mg.l-1) in 14h adsorption column. -> PO43-> NO3-> Cl-. The material can be eluted with 0.5mg.l-1 of Na2CO3 after being adsorbed on the material, and then regenerated after calcined at 600 ° C for 10min.