Nanostructured manganese oxides: natural/artificial formation and their induced catalysis for wastewater remediation
Nanostructured manganese oxides: natural/artificial formation and their induced catalysis for wastewater remediation
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DOI：
10.1039/c9en01250h
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
Shishu Zhu;Shih-Hsin Ho;Chao Jin;Xiaoguang Duan;Shaobin Wang
中科院分区：
文献类型：
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作者：
Shishu Zhu;Shih-Hsin Ho;Chao Jin;Xiaoguang Duan;Shaobin Wang
锰氧化物具有低毒性和广泛的适应性，已被证明是在多种化学反应中替代贵金属/氧化物的有前途的催化剂。在环境修复中，锰氧化物可以催化过氧化物在水相中产生活性氧（ROS），用于原位化学氧化（ISCO）和高级氧化工艺（AOPs）。锰氧化物在过渡金属氧化物中脱颖而出，这是由于它们在氧化还原性质、晶体结构和表面纳米结构方面的固有差异。本文综述了自然界中纳米结构锰氧化物的形成（非生物氧化和生物进化）及其人工合成，并对纳米结构锰氧化物的隧道和层、晶体结构、晶面取向、尺寸结构和氧化态进行了合理控制。我们进一步综述了纳米结构锰氧化物在活化各种过氧化物催化氧化水中有机污染物的应用。锰氧化物在过氧化氢（H2 O2）、臭氧（O3）和过硫酸盐（过一硫酸盐和过二硫酸盐）的催化活化中的作用被强调。锰氧化物与不同的过氧化物和结构依赖性的ROS生产之间的相互作用的机制将被说明。进一步讨论了组分掺杂、形成混合金属氧化物和杂化材料对催化活性的影响规律。更重要的是，自由基氧化和非自由基途径参与锰基的高级氧化工艺将被说明。最后，对锰氧化物在实际应用中的发展前景提出了几点展望。
Manganese oxides, with low toxicity and wide adaptability, have been demonstrated as promising catalysts for substituting noble metals/oxides in a diversity of chemical reactions. In environmental remediation, manganese oxides can catalyze peroxides to produce reactive oxygen species (ROS) in an aqueous phase for in situ chemical oxidation (ISCO) and advanced oxidation processes (AOPs). The manganese oxides stand out among the transition metal oxides due to their inherent dissimilarity in redox properties, crystal structure, and surface nano-architectures. In this paper, a comprehensive review is presented on the formation of nanostructured manganese oxides in nature (abiotic oxidation and biogenic evolution) as well as their artificial synthesis with rationally controlled tunnels and layers, crystal structures, exposed facet orientations, dimensional architecture and oxidation states. We further overview the applications of nanostructured manganese oxides in activation of various peroxides for catalytic oxidation to destroy organic contaminants during water purification. The roles of manganese oxides are emphasized in catalytic activation of hydrogen peroxide (H2O2), ozone (O3), and persulfates (peroxymonosulfate and peroxydisulfate). The mechanisms of the interactions between manganese oxides with the diverse peroxides and structure-dependent ROS production will be illustrated. The regulating rules of compositional alien-metal doping, formation of mixed metal oxides and hybrid materials are further discussed regarding the promoted catalytic activity. More importantly, both radical oxidation and nonradical pathways involved in manganese-based AOPs will be illustrated. Lastly, we will propose several prospects for future development of manganese oxides in practical applications.