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首页> 外文期刊>Journal of the Taiwan Institute of Chemical Engineers >Heterogeneous catalytic degradation of organic compounds using nanoscale zero-valent iron supported on kaolinite: Mechanism, kinetic and feasibility studies
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Heterogeneous catalytic degradation of organic compounds using nanoscale zero-valent iron supported on kaolinite: Mechanism, kinetic and feasibility studies

机译：高碳酸盐零价铁的非均相催化降解有机化合物：机理，动力学和可行性研究

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Herein, nano zero-valent iron (NZVI) particles were anchored on kaolinite (K) for preparation of a mesoporous heterogeneous catalyst (marked as NZVI@K) in Fenton-like oxidation of Acid Black 1 (AB1) dye. The properties of morphological, physico-chemical and textural of catalyst were characterized using powder X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscope (TEM), field emission scanning electron microscope (FESEM) and energy dispersive X-ray spectrometer (EDS) techniques. Results indicated that NZVI particles with 40-80 nm diameter were incorporated successfully on K surface and iron was predominantly in Fe form. Prior oxidation experiments, adsorption studies were performed to determine the equilibrium point and also modeling (kinetic and isotherm) of the process. Fenton-like oxidation showed a better performance in decolorization of AB1, compared to adsorption process. The excellent reusability and high stability were found for NZVI@K during four consecutive use cycles. Under optimum operational conditions (pH: 2.0, catalyst dose: 0.3 g/L, H2O2 amount: 4.0 Mm), over 98% of dye (30 mg/L) and 76% of TOC were removed within 120 min reaction. A tentative mechanism was proposed for decomposition of H2O2 and production of reactive oxidizing species, based on the results of quenching tests. Decreasing decolorization rate in the presence of anions obeys the order of bicarbonate > chloride > nitrate > sulfate. A significant synergistic effect was detected when NZVI@K were coupled with H2O2. Reducing removal efficiency and the scavenging effect were observed at excessive concentrations of both catalyst and oxidant. Integration of adsorption and oxidation processes using NZVI@K coupled with H2O2 can be introduced as a promising technique for efficient decolorization of wastewaters, due to high adsorption capacity, good catalytic activity and minimal iron leaching. (C) 2018 Taiwan Institute of Chemical Engineers. Published by Elsevier B
机译：这里，纳米零价铁（NZVI）颗粒锚固在高岭石（K）上，用于制备在酸黑色1（AB1）染料的芬顿氧化氧化中的介孔异质催化剂（标记为NZVI @ K）。用粉末X射线衍射（XRD），Brunauer-Emmett-Teller（Bet），透射电子显微镜（TEM），场发射扫描电子显微镜（FESEM）和能量进行形态，物理化学和催化剂纹理的性质。分散X射线光谱仪（EDS）技术。结果表明，具有40-80nm直径的NZVI颗粒成功地掺入K表面，铁主要以Fe形式掺入。现有氧化实验，进行吸附研究以确定该过程的平衡点和建模（动力学和等温线）。与吸附过程相比，芬顿氧化在AB1的脱色方面表现出更好的性能。在四次连续使用循环期间，NZVI @ K发现了出色的可重用性和高稳定性。在最佳操作条件下（pH：2.0，催化剂剂量：0.3g / L，H 2 O 2量：4.0mm），在120分钟内除去超过98％的染料（30mg / L）和76％的TOC。基于淬火试验的结果，提出了对H 2 O 2分解的暂定机理和活性氧化物种的产生。在阴离子的存在下降低脱色率，使碳酸氢盐>氯化物>硝酸盐>硫酸盐的序列。当NZVI @ K与H 2 O 2偶联时，检测到显着的协同效应。在过量浓度的催化剂和氧化剂的过度浓度下观察到降低去除效率和清除效果。使用NZVI @ K与H2O2相结合的吸附和氧化过程的整合可以作为有望的技术，以有效的技术，以获得废水的有效脱色，由于高吸附能力，良好的催化活性和最小的铁浸出。 （c）2018台湾化工工程师研究所。 elsevier b出版

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