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Synthesis of different crystallographic FeOOH catalysts for peroxymonosulfate activation towards organic matter degradation

机译：合成用于过氧化单硫酸盐活化以降解有机物的不同结晶FeOOH催化剂

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In this study, different crystalline structures of FeOOH have been prepared. α-FeOOH was synthesized through a hydrothermal method, whereas β-FeOOH was synthesized via a direct hydrolysis method. Moreover, γ- and δ-FeOOH were prepared by precipitation methods through slow and quick oxidation, respectively. On this basis, their crystal structure, morphology, and surface area were measured. Then, all the synthesized materials were applied to activate peroxymonosulfate (PMS) to generate sulfate radicals (SO _(4) ~(?) ˙) for acid orange 7(AO7) degradation. Compared with α-FeOOH, β-FeOOH, and γ-FeOOH, δ-FeOOH showed more efficient decolorization of AO7 in the catalytic system because of its abundant surface area and crystalline structure. The effects of several parameters in the δ-FeOOH/PMS/AO7 system were investigated. The results show that the initial pH, which is related to the features of surface hydroxyl groups, is the decisive factor, and excellent catalytic activity is maintained in the pH range 5–8. The increase of catalyst dosage and appropriate increase of PMS concentration contributed to promote the degradation effect. However, self-quenching was observed in a high PMS concentration system. Moreover, δ-FeOOH was stable after six consecutive cycles, and the leaching of iron ions was negligible. According to the quenching test and electron spin resonance analysis, both SO _(4) ~(?) ˙ and ˙OH were the dominant radicals for AO7 degradation.
机译：在这项研究中，已经制备了不同的FeOOH晶体结构。通过水热法合成α-FeO​​OH，而通过直接水解法合成β-FeOOH。此外，通过沉淀法通过缓慢和快速氧化分别制备了γ-和δ-FeOOH。在此基础上，测量了它们的晶体结构，形态和表面积。然后，将所有合成的材料应用于活化过氧单硫酸盐（PMS），以产生硫酸根（SO _（4）〜（？）˙）降解酸性橙7（AO7）。与α-FeO​​OH，β-FeOOH和γ-FeOOH相比，δ-FeOOH由于其丰富的表面积和晶体结构，在催化体系中表现出更有效的AO7脱色。研究了δ-FeOOH/ PMS / AO7系统中几个参数的影响。结果表明，初始pH与表面羟基的特征有关，是决定性因素，在5-8的pH范围内保持了优异的催化活性。催化剂用量的增加和PMS浓度的适当增加有助于促进降解效果。但是，在高PMS浓度系统中观察到自淬灭。此外，在连续六个循环后，δ-FeOOH保持稳定，铁离子的浸出可以忽略不计。根据猝灭试验和电子自旋共振分析，SO _（4）〜（α）˙和˙OH都是AO7降解的主要自由基。

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