|
Fluoride is one of the essential trace element to human, but the differences in content and conditions will lead different effects or even opposite effects. In general, in the groundwater, when F<0.5mg/l, will make people to have a dental caries,1-1.5 mg/l,will easy to get the mottled teeth,3-6mg/l, it will have fluorosis,lead to skeletal deformities, referred to as "osteofluorosis",and more than 10mg/l, it will lead disabled.The high fluoride water are widely spread in the Northwest of China, drinking the high fluoride water will cause the loss of the work ability. This is not only severely impair the health of the local people,also restrict the local economic development.Therefore, high fluoride water purification, treatment has elicited great concern, adsorption method is an effective means of dealing with fluorinated water.Layered double hydroxides (LDH), its structure is similar to the layered structure of brucite interlayer anions and other anions can be exchanged with the outside world, which LDH has excellent performance anion exchange, in the high fluoride water treatment has some advantages.The conventional Mg-Al type LDH, Zn-Al type LDH and Mg-Fe type LDH as the adsorbent of high fluoride water have gradually matured and is also effective.This paper we proposed to use Mg-Al13 LDH instead of Mg-AlCl3 LDH and studied the factors and optimum reaction conditions of Mg-Al13 LDH in dealing with high fluoride water.Then compared with the Mg-AlCl3 LDH, Treatment effect of Mg-Al13 LDH is better First experiment studied the pH value, Mg/Al/Ca concentration, F-concentration on the initial, which impact with the removal of the law. And then use tap water of Peking University as the water samples, make a further discussion about the actual treatment effect of LDH in the water. Finally, on the basis of previous experiments, determine the optimal reaction conditions and Compared Mg-Al13 LDH with Mg-AlCl3 LDH. We obtained that it is better to useing Mg-Al13 LDH to remove F-
|