Undiscovered Multiple Roles of Multivalent Cations in the Pollutant Removal from Actual Water by Persulfate Activated by Carbon Materials,ACS ES&T Engineering

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Undiscovered Multiple Roles of Multivalent Cations in the Pollutant Removal from Actual Water by Persulfate Activated by Carbon Materials
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2021-06-13 , DOI: 10.1021/acsestengg.1c00121
Han-Chao Zhang ₁ , Jiang-Jin Han ₁ , Xin Zhang ₁ , Pu-Can Guo ₁ , Dong-Hua Xie ₁ , Guo-Ping Sheng ₁

Affiliation

Enormous works have focused on the influence of natural organic matter (NOM) and anions (e.g., Cl^– and HCO₃^–) on the pollutant removal efficiency by persulfate activation technologies. However, the impact of multivalent cations in actual water, e.g., Ca²⁺, on the pollutant removal has been overlooked in past research. In this work, we surprisingly found that pollutant degradation by the carbon materials activating persulfate in some actual water (e.g., groundwater) was higher than that in the buffer solution, and the bridging effect of multivalent cations in the actual water was the main reason. Through the bridging effect of multivalent cations, persulfate was bound on the surface of carbon materials to accelerate its decomposition. However, the promotion mechanism of multivalent cations on the radical and nonradical pathways of persulfate activation was different. Furthermore, the NOM aggregation was also promoted by multivalent cations, thereby inhibiting its quenching effect on the pollutant degradation. Besides that, these multivalent cations could lead to the coagulation of carbon materials, which was harmful for its catalytic performance. This work highlights the multiple roles of multivalent cations in the actual water in the persulfate activated by the carbon material process, and it was conducive to the practical application of Fenton-like technologies in actual water treatment.

中文翻译：

未发现的多价阳离子在碳材料活化过硫酸盐去除实际水中污染物中的多重作用

大量研究集中在天然有机物 (NOM) 和阴离子（例如 Cl ^-和 HCO ₃^-）对过硫酸盐活化技术污染物去除效率的影响上。然而，多价阳离子在实际水中的影响，例如 Ca ²⁺，关于污染物的去除在过去的研究中一直被忽视。在这项工作中，我们惊奇地发现，在某些实际水体（例如地下水）中，碳材料活化过硫酸盐对污染物的降解高于缓冲溶液中的污染物，而实际水中多价阳离子的架桥效应是主要原因。通过多价阳离子的架桥作用，过硫酸盐结合在碳材料表面，加速其分解。然而，多价阳离子对过硫酸盐活化的自由基和非自由基途径的促进机制是不同的。此外，多价阳离子也促进了 NOM 的聚集，从而抑制了其对污染物降解的淬灭作用。除此之外，这些多价阳离子可能导致碳材料的凝结，这对其催化性能有害。该工作突出了多价阳离子在碳材料活化过硫酸盐过程中在实际水中的多重作用，有利于类芬顿技术在实际水处理中的实际应用。

更新日期：2021-08-13

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