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首页> 外文期刊>Separation and Purification Technology >The key role of free radicals generated from activation of H2O2, S2O82- and ozone over chromium/cerium co-doped magnetite nanoparticles
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The key role of free radicals generated from activation of H2O2, S2O82- and ozone over chromium/cerium co-doped magnetite nanoparticles

机译：从H 2 O 2，S2O82和臭氧的激活产生的自由基产生的关键作用，通过铬/铈共掺杂磁铁矿纳米粒子

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A wide range of heterogeneous catalysts has been used for degradation of dyes through various techniques, albeit, little is recognized about the productive activation of hydrogen peroxide (HP), persulfate (PS), and ozone over heterogeneous catalysts and under UV light irradiation. In this research, Cr and Ce were placed within the magnetite structure and the resultant nanoparticles were characterized by XRD, SEM, HRTEM, EDX, BET, VSM, DRS, XPS, and FT-IR analyses. The synthesized magnetic nanoparticles were used in a series of photocatalytic processes for the degradation of methylene blue dye (MBD) as a probe molecule. The Fe2.5Cr0.2Ce0.3O4 sample showed great performance in comparison with the other samples. The highest activity of Fe2.5Cr0.2Ce0.3O4 sample was described based on its ability to effectively actuate HP, PS, and ozone under UV light irradiation. The outcomes of the studied systems: catalyst, UV, and UV-catalyst alone and along with oxidants were well illustrated in contrast to one another. In this regard, the effects of HP and PS concentrations and ozone inlet flow rate were evaluated. The results postulated that the ozone-based systems had eminent efficiency in the degradation of MBD. In each process, the reusability of the Fe2.5Cr0.2Ce0.3O4 sample was studied and the superior stability of the catalyst was inferred. The mineralization efficacy of MBD was appraised by total organic carbon (TOC) and the order of TOC removal capacity was found as UV-catalyst-PS > UV-catalyst-ozone > UV-catalyst-HP. Eventually, GC-MS analysis of the oxidized samples confirmed the formation of 8 intermediates by the UV-catalyst-ozone system.
机译：广泛的异质催化剂已通过各种技术用于染料的降解，尽管迄今对过氧化氢（HP），过硫酸盐（PS）和臭氧在非均相催化剂上并且在UV光照射下缺乏识别。在该研究中，将Cr和Ce置于磁铁矿结构内，并通过XRD，SEM，HRTEM，EDX，BET，VSM，DRS，XPS和FT-IR分析表征了所得纳米颗粒。合成的磁性纳米颗粒用于一系列光催化过程，用于降解亚甲基蓝染料（MBD）作为探针分子。与其他样品相比，Fe2.5CR0.2CE0.3O4样品显示出具有很大的性能。基于其在UV光照射下的有效致动HP，PS和臭氧的能力，描述了Fe2.5CR0.2CE0.3O4样品的最高活性。所研究的系统的结果：单独的催化剂，紫外线和紫外催化剂以及氧化剂彼此相反地说明。在这方面，评估HP和PS浓度和臭氧入口流速的影响。结果假设基于臭氧的系统在MBD的降解中具有卓越的效率。在每种过程中，研究了Fe2.5CR0.2CE0.3O4样品的可重用性，并推断出催化剂的优异稳定性。 MBD的矿化效果被总有机碳（TOC）评估，并发现TOC去除能力的顺序被发现为UV催化剂-PS> UV催化剂 - 臭氧> UV催化剂-HP。最终，氧化样品的GC-MS分析证实了UV催化剂 - 臭氧系统的8个中间体。

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