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A continuous electroreduction cell composed of palladium nanocatalyst immobilized on discarded cigarette filters as an active bed for Cr(VI) removal from groundwater.
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.jenvman.2020.110409 Mostafa Dorosti 1 , Majid Baghdadi 1 , Sorour Nasimi 1
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.jenvman.2020.110409 Mostafa Dorosti 1 , Majid Baghdadi 1 , Sorour Nasimi 1
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In this research, a unique continuous electrochemical cell was designed and applied for the disinfection of groundwater and simultaneous Cr(VI) reduction and Cr(III) precipitation. Discarded cigarette filters (DCFs) were utilized as an efficient bed for palladium nanoparticles (PdNPs) immobilization located between porous anode and cathode made of graphite felt. The characterization of the bed was performed using FE-SEM, EDS, BET, and FT-IR analysis. The results confirmed the distribution of palladium nanoparticles on the surface of DCFs. The proposed design for electrochemical cell obviated the need to divide the anolyte and catholyte because the anode was located at the outlet of the cell, thereby avoiding the reaction between hydrogen radicals produced on the surface of PdNPs and oxygen and chlorine produced in the anode. The hydrogen gas produced in the cathode was converted to hydrogen radicals, acting as the most prominent species for the reduction. Hydroxide ions produced in the cathode increased the pH of the solution between electrodes, resulting in the precipitation of Cr (III) with an efficiency of 96%. Furthermore, free chlorine at the concentration of 1 mg L-1 was generated through chloride ion oxidation in the anode, which can be effective for disinfection. The effect of initial Cr (VI) concentration (C0), flow rate (Q), and current (I) was investigated, and the maximum removal efficiency (99.7%) was observed at the flow rate of 5 mL min-1 and current of 0.05 A, respectively. No interference ensued from the various coexisting ions in groundwater. The findings of this study suggested that the proposed electrochemical cell is capable of in-situ total chromium removal and free chlorine production in groundwater simultaneously.
中文翻译：
一个连续的电解槽，由固定在废弃香烟滤嘴上的钯纳米催化剂组成，作为从地下水中去除六价铬的活性床。
在这项研究中，设计了一种独特的连续电化学电池，并将其用于地下水消毒以及同时还原Cr（VI）和Cr（III）沉淀。丢弃的香烟过滤嘴（DCF）被用作固定在多孔阳极和石墨毡制成的阴极之间的钯纳米粒子（PdNP）固定的有效床。使用FE-SEM，EDS，BET和FT-IR分析对床进行表征。结果证实了钯纳米颗粒在DCF表面上的分布。提出的电化学电池设计避免了将阳极电解液和阴极电解液分开的需要，因为阳极位于电池的出口，从而避免了PdNPs表面产生的氢自由基与阳极产生的氧气和氯气之间的反应。阴极中产生的氢气转化为氢自由基，成为还原反应中最主要的物质。阴极中产生的氢氧根离子增加了电极之间溶液的pH值，导致Cr（III）沉淀，效率为96％。此外，阳极中的氯离子氧化会产生1 mg L-1浓度的游离氯，这对于消毒是有效的。研究了初始Cr（VI）浓度（C0），流速（Q）和电流（I）的影响，在流速为5 mL min-1和电流下观察到最大去除效率（99.7％）分别为0.05A。地下水中各种共存离子不会产生干扰。
更新日期：2020-03-31
中文翻译：
一个连续的电解槽，由固定在废弃香烟滤嘴上的钯纳米催化剂组成，作为从地下水中去除六价铬的活性床。
在这项研究中，设计了一种独特的连续电化学电池，并将其用于地下水消毒以及同时还原Cr（VI）和Cr（III）沉淀。丢弃的香烟过滤嘴（DCF）被用作固定在多孔阳极和石墨毡制成的阴极之间的钯纳米粒子（PdNP）固定的有效床。使用FE-SEM，EDS，BET和FT-IR分析对床进行表征。结果证实了钯纳米颗粒在DCF表面上的分布。提出的电化学电池设计避免了将阳极电解液和阴极电解液分开的需要，因为阳极位于电池的出口，从而避免了PdNPs表面产生的氢自由基与阳极产生的氧气和氯气之间的反应。阴极中产生的氢气转化为氢自由基，成为还原反应中最主要的物质。阴极中产生的氢氧根离子增加了电极之间溶液的pH值，导致Cr（III）沉淀，效率为96％。此外，阳极中的氯离子氧化会产生1 mg L-1浓度的游离氯，这对于消毒是有效的。研究了初始Cr（VI）浓度（C0），流速（Q）和电流（I）的影响，在流速为5 mL min-1和电流下观察到最大去除效率（99.7％）分别为0.05A。地下水中各种共存离子不会产生干扰。
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