Abstract

A series Cu decorated MnO₂/γ-Al₂O₃ catalysts (Cu load, 1%, 3% and 5%) was fabricated by facile co-impregnation method, and investigated for the catalytic oxidative removal Na₂S in waste water. Compared with MnO₂/γ-Al₂O₃, the catalytic activity and stability of Cu-MnO₂/γ-Al₂O₃, was enhanced by modifying with Cu element. XRD, SEM, BET, H₂-TPR and XPS were carried out to characterize these catalyst. XRD and BET show the Cu successfully decorated on the MnO₂/γ-Al₂O₃, and catalyst’s pristine structure are well maintained. SEM shows that the doped Cu species benefits to the uniform dispersion of Mn species, H₂-TPR suggests that the reodox capacity of Cu decorated catalysts were improved after doping with Cu, and XPS shows that doped Cu produces higher concentration of Mn⁴⁺ and O_ads (surface active oxygen species), also expediting the redox cycling between Mn⁴⁺/Mn³⁺ and the promote the O_ads production, which resulting in the enhancement of redox properties. Hence, 3%Cu-MnO₂/γ-Al₂O₃ catalyst could achieve 97.5% degradation of Na₂S in waste water at room conditions in 2 h, by the help of air, this result is superior to other published work.

中文翻译：

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铜掺杂的MnO 2 /γ-Al2 O 3：一种在环境条件下降解废水中Na 2 S的简便高效催化剂

摘要

一系列的Cu饰的MnO ₂ /γ-Al系_2种ö ₃催化剂（铜负载，1％，3％和5％）通过容易的共浸渍方法制造，并且研究用于催化氧化除去的Na ₂ S IN的废水。与比较的MnO ₂ /γ-Al系₂ ö ₃，铜的MnO的催化活性和稳定性₂ /γ-Al系₂ ö ₃，通过用Cu元素改性增强。进行XRD，SEM，BET，H ₂ -TPR和XPS表征这些催化剂。XRD和BET显示在Cu成功装饰上的MnO ₂ /γ-Al系₂ ö ₃，并且催化剂的原始结构得到很好的维护。扫描电镜显示掺杂的铜物种有利于锰物种的均匀分散，H ₂ -TPR表明掺杂铜后，装饰有铜的催化剂的氧化还原能力得到提高，而XPS表明掺杂的铜产生更高浓度的Mn ⁴⁺和Mn。O _ads（表面活性氧物质）也加快了Mn ⁴⁺ / Mn ³⁺之间的氧化还原循环，并促进了O _ads的产生，从而提高了氧化还原性能。因此，3％的Cu-的MnO ₂ /γ-Al系₂ ö ₃催化剂可达到的Na 97.5％降解₂室温下，在空气中2小时内，空气中的S含量要优于其他已发表的研究结果。