{"title":"电催化脱氯中钯纳米颗粒抗nom中毒性能的预嵌入策略","authors":"Linpiao Cheng, Shuyue Liu, Yinan Liu, Xiangyi Tang, Mue Tang, Xinhua Xu, Xiaoshu Lv","doi":"10.1016/j.electacta.2025.145642","DOIUrl":null,"url":null,"abstract":"Electrocatalytic hydrodechlorination (EHDC) represents a sustainable approach to detoxifying the chlorinated organic pollutants (COPs). However, electrodes often suffer from fouling due to the ubiquitous natural organic matters (NOM) in surface water bodies. Herein we demonstrated that pre-mixing humic acid (HA) with palladium nanoparticles (Pd NPs) is an ingenious approach to address this issue. The introduction of HA improved dispersion of Pd NPs, enhanced surface hydrophilicity to promote H* generation, and increased electrostatic repulsion and steric-hinerance against NOM in solution. As a result, the as-synthesized HA<sub>0.2</sub>-Pd electrode exhibits significantly improved EHDC performance and anti-NOM poisoning ability. In the batch experiment, the HA<sub>0.2</sub>-Pd NPs achieved removal efficiencies of 91.3 and 80.8% respectively, for treating 50.0 mg L<sup>−1</sup> of 2,4-dichlorophenol (2,4-DCP, a probe COP) from contaminated water in the absence or presence of 20 mg L<sup>−1</sup> HA (representative of NOM) at -0.85 V <em>vs.</em> Ag/AgCl. Compared to that, the pure Pd/C electrode experienced a marked efficacy decline from 82.9 to 56.5% in the presence of HA. Moreover, the HA<sub>0.2</sub>-Pd/C electrode maintained a steady efficiency above 92.0% over 12 h EHDC in a continuous-flow cell, while only 60.0% for the Pd/C electrode. When subjected to contaminated natural water, the HA<sub>0.2</sub>-Pd/C electrode afforded an EHDC efficiency of 75.4%, significantly surpassing the 39.4% efficiency of Pd/C electrode.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"34 1","pages":""},"PeriodicalIF":5.5000,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Pre-embedded Strategy for Anti-NOM Poisoning Performance of Palladium Nanoparticles in Electrocatalytic Dechlorination\",\"authors\":\"Linpiao Cheng, Shuyue Liu, Yinan Liu, Xiangyi Tang, Mue Tang, Xinhua Xu, Xiaoshu Lv\",\"doi\":\"10.1016/j.electacta.2025.145642\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Electrocatalytic hydrodechlorination (EHDC) represents a sustainable approach to detoxifying the chlorinated organic pollutants (COPs). 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Compared to that, the pure Pd/C electrode experienced a marked efficacy decline from 82.9 to 56.5% in the presence of HA. Moreover, the HA<sub>0.2</sub>-Pd/C electrode maintained a steady efficiency above 92.0% over 12 h EHDC in a continuous-flow cell, while only 60.0% for the Pd/C electrode. 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引用次数: 0
摘要
电催化氢脱氯(EHDC)代表了一种可持续的方法来解毒氯化有机污染物(cop)。然而,由于地表水中普遍存在的天然有机物质(NOM),电极经常受到污染。在这里,我们证明了将腐植酸(HA)与钯纳米粒子(Pd NPs)预混合是解决这一问题的一种巧妙方法。HA的引入改善了Pd NPs的分散性,增强了表面亲水性以促进H*的生成,并增加了溶液中对NOM的静电斥力和空间阻抗。结果表明,合成的HA0.2-Pd电极具有显著提高的EHDC性能和抗nom中毒能力。在批量实验中,在不含或存在20 mg L - 1 HA (NOM的代表)的情况下,在-0.85 V /Ag /AgCl下,HA0.2-Pd NPs对污染水中50.0 mg L - 1 2,4-二氯苯酚(2,4- dcp,一种探针COP)的去除率分别为91.3和80.8%。相比之下,在HA的存在下,纯Pd/C电极的效率从82.9%下降到56.5%。在连续流动电池中,HA0.2-Pd/C电极在12 h EHDC内的效率稳定在92.0%以上,而Pd/C电极的效率仅为60.0%。当自然水体受到污染时,HA0.2-Pd/C电极的EHDC效率为75.4%,显著超过Pd/C电极的39.4%。
Pre-embedded Strategy for Anti-NOM Poisoning Performance of Palladium Nanoparticles in Electrocatalytic Dechlorination
Electrocatalytic hydrodechlorination (EHDC) represents a sustainable approach to detoxifying the chlorinated organic pollutants (COPs). However, electrodes often suffer from fouling due to the ubiquitous natural organic matters (NOM) in surface water bodies. Herein we demonstrated that pre-mixing humic acid (HA) with palladium nanoparticles (Pd NPs) is an ingenious approach to address this issue. The introduction of HA improved dispersion of Pd NPs, enhanced surface hydrophilicity to promote H* generation, and increased electrostatic repulsion and steric-hinerance against NOM in solution. As a result, the as-synthesized HA0.2-Pd electrode exhibits significantly improved EHDC performance and anti-NOM poisoning ability. In the batch experiment, the HA0.2-Pd NPs achieved removal efficiencies of 91.3 and 80.8% respectively, for treating 50.0 mg L−1 of 2,4-dichlorophenol (2,4-DCP, a probe COP) from contaminated water in the absence or presence of 20 mg L−1 HA (representative of NOM) at -0.85 V vs. Ag/AgCl. Compared to that, the pure Pd/C electrode experienced a marked efficacy decline from 82.9 to 56.5% in the presence of HA. Moreover, the HA0.2-Pd/C electrode maintained a steady efficiency above 92.0% over 12 h EHDC in a continuous-flow cell, while only 60.0% for the Pd/C electrode. When subjected to contaminated natural water, the HA0.2-Pd/C electrode afforded an EHDC efficiency of 75.4%, significantly surpassing the 39.4% efficiency of Pd/C electrode.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.