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| Catalytic degradation of EDTA-Cd by EDTA-Cu in MXene/PMS process: Performance and mechanism |
| SONG Hao-ran, XU Yi-hang, CHEN Long-yu, ZHAO Qun, LI Chen, CAO Yan, ZHANG Lin-feng, HU Xue-wei, LIU Shu-gen, LI Ying-jie, LI Jie, TIAN Sen-lin |
| Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China |
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Abstract Without the addition of low-valent transition metals, MXene/PMS achieved efficient degradation of EDTA-Cd and recovery of Cd using copper ethylenediaminetetraacetate (EDTA-Cu). The removal efficiency of EDTA-Cd and total Cd reached 80% and 95% within 30minutes, respectively. Increasing the concentrations of MXene, PMS, and Cu2 significantly enhanced the removal of EDTA-Cd and total Cd. The primary reactive species in reaction process were identified as hydroxyl radical (HO·) and sulfate radical (SO4·-). Excellent performance was maintained within a pH range of 3.0 to 9.0, with good resistance to Cl-, HCO3-, HPO42-, and humic acid. Activation of PMS by MXene initiated the oxidative decomposition of EDTA-Cu and released free Cu ions. Then, MXene triggered the Cu(II)/Cu(I) cycle and furtherly enhanced PMS activation, and thereby achieved the efficient degradation of EDTA-Cu/Cd. Additionally, MXene exhibited excellent adsorption capacity for Cu and Cd ions, thus to achieve the recovery of heavy metals. This study utilized the transition metals inherent in heavy metal complexs to develop an efficient method that simultaneously achieves the oxidative decomplexation of heavy metal complexes and the recovery of heavy metals.
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Received: 21 May 2024
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