Azo dyes are not efficiently removed in water treatment. So the development of excellent absorbent is significant important for environmental protection. In this study, ceria is successfully immobilized on 40-60 mesh sand by using a simple method of sol–gel. And then research the effect of absorption on azo dyes in waster using immobilized CeO₂ (ICe). The ICe absorbent displays high removal efficiency for AB10 (one typical kind of azo dyes) in waste water. In addition, after absorbing, concentration and toxicity of azo dye decreased and the absorbent easily separation from water which indicates that the technique is a promising post-treatment process to improve water quality.

在水处理中不能有效去除偶氮染料。因此，开发优异的吸收剂对环境保护具有重要意义。在这项研究中，使用一种简单的溶胶-凝胶法将二氧化铈成功地固定在40-60目沙子上。然后研究了固定化的CeO ₂（ICe）吸收对废料中偶氮染料吸收的影响。ICe吸收剂对废水中的AB10（一种典型的偶氮染料）具有很高的去除效率。另外，吸收后，偶氮染料的浓度和毒性降低，吸收剂易于与水分离，这表明该技术是改善水质的有前途的后处理工艺。