纳米刻蚀法制备氧化锰介孔材料及其降解高含盐废水中罗丹明B

为了有效去除高含盐废水中的有机染料污染物，利用有序介孔硅材料作为模板剂，通过硬模板法制备了新型锰系氧化物（MnO_x）介孔材料作为类Fenton催化剂.催化剂的结构表征结果表明，模板剂在锰前驱物溶液中浸渍和后续煅烧成型过程决定了氧化锰介孔材料的结构.浸渍-煅烧成型重复次数越多，MnO_x介孔材料中孔道结构的有序度和氧化锰的结晶度越好.浸渍-煅烧成型次数过少，MnO_x介孔材料中孔道呈现无序状态，比表面积较大但氧化锰结晶度不足；次数过多则形成更为致密的小孔径的孔道结构，从而使MnO_x介孔材料的比表面积减小.由于对罗丹明B（RhB）良好的选择性吸附能力和较多的Mn³⁺/Mn⁴⁺对，具有有序规则孔道的氧化锰介孔材料具有优异的类Fenton催化活性，对高含盐废水中RhB的5 h降解去除率最高可达90%左右.

Preparation of manganese oxide mesoporous material by nano etching and degradation of Rhodamine B in high-salt wastewater

In order to remove organic pollutants from high-salinity wastewater, a novel manganese oxide mesoporous material (MnO_x) was prepared as a Fenton-like catalyst by the hard template method using the ordered mesoporous silicon as a template. Structure characterization results showed that the microstructure of (MnO_x) mesoporous material was determined by the immersion of the template in the manganese precursor solution and the subsequent calcination-molding process. More repetitions of the immersion and calcination-molding were carried out, the better the order of the pore structure and the crystallinity of manganese oxide in the mesoporous material were. If the proceeding of the process of immersion and calcination-molding is not enough, the pores in the MnO_x mesoporous material will exhibit the disordered structure. Although the specific surface area of material was large, the crystallinity of the manganese oxide was insufficient; Too much cycles of the immersion and calcination-molding process caused a dense pore structure with small pore size, which decrease the specific area of the MnO_x mesoporous material. Due to the good selective adsorption performance for RhB and rich Mn³⁺/Mn⁴⁺ couples, MnO_x mesoporous materials with ordered regular pores had excellent Fenton-like catalytic performance, and the highest removal rate of RhB in highly saline wastewater reached around 90% after 5 h degradation.