氧化铝负载镧去除水中F^-的研究

Removal of fluoride from water using lanthanum oxide-coated alumina

通过固相反应合成了氧化铝负载的氧化镧吸附剂并研究了其对水中F-的吸附.结果表明,合成的材料对F-有很好的去除效果,最大吸附量达到53.4mg·g-1;适当提高吸附温度和氧化镧负载量都能在一定范围内提高吸附量;较低的固相反应焙烧温度有利于提高去除率,随着焙烧温度的升高,吸附量从170℃焙烧的42.2mg·g-1下降到了350℃焙烧的32.9mg·g-1.同时,吸附剂表现出了很好的适应性,在较宽的pH范围内都能保持较高的吸附量.

Lanthanum oxide-coated alumina was prepared by a solid-state reaction, and its ability to adsorb fluoride from aqueous solution was investigated. Results showed that the adsorbent had a high capacity with the maximum adsorption capacity of 53.4 mg·g^-1. Increasing the loading of lanthanum oxide as well as the adsorption temperature enhanced fluoride adsorption. The high fluoride adsorption capacity could be retained over a relatively wide pH range （pH 6 to 9）. Increasing the calcination temperature from 170℃ to 350℃ led to a decrease of fluoride absorption capacity from 42,2 to 32.9 mg.g^-1