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采用共沉淀法和焙烧处理制备了三种不同的焙烧水滑石(CLDH):Zn-Al-CLDH、Mg-Al-CLDH和Fe-Al-CLDH,对其进行了X射线衍射、比表面积和扫描电镜表征,并将其用作吸附剂去除水中的溴酸盐。结果表明,Zn-Al-CLDH对溴酸盐的去除效果最好,而Fe-AlCLDH对溴酸盐的去除效果最差;当p H值为7、温度为20℃、振荡速度为200 r/min、溴酸盐初始浓度为100μg/L时,1 g/L的Zn-Al-CLDH在0.5 h内可吸附去除92.8%的溴酸盐,经2.5 h达到吸附平衡,此时对溴酸盐的去除率为98%;在相同条件下Mg-Al-CLDH和Fe-Al-CLDH的吸附平衡时间分别为14和1.5 h,去除率分别为96%和49.6%;另外,CLDH对溴酸盐的吸附是放热反应,且吸附性能易受空气的影响。
Three kinds of calcined hydrotalcite (CLDH) were prepared by coprecipitation and calcination: Zn-Al-CLDH, Mg-Al-CLDH and Fe-Al-CLDH, which were characterized by X-ray diffraction, specific surface area and scanning Characterized by electron microscopy and used as an adsorbent to remove bromate from water. The results show that Zn-Al-CLDH has the best removal of bromate and Fe-AlCLDH has the worst removal of bromate. When p H is 7, the temperature is 20 ℃ and the oscillation speed is 200 r / min, the initial concentration of bromate was 100μg / L, 1g / L of Zn-Al-CLDH can adsorb 92.8% of bromate within 0.5 h, adsorption balance reached after 2.5 h, then bromate The removal rates of Mg-Al-CLDH and Fe-Al-CLDH were 14 and 1.5 h, respectively, and the removal efficiencies were 96% and 49.6% respectively under the same conditions. In addition, The adsorption is exothermic, and the adsorption properties are susceptible to air.