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- W2915396960 abstract "The control of thallium (Tl) pollution in wastewater is much less studied than that of other heavy metals (Cd, Hg, Pb) and metalloids (As), with even less research on the simultaneous treatment of Tl and organics. In this study, the simultaneous removal of thallium and organics from aqueous solutions using a zero-valent-iron (Fe0)-based Fenton-like technique was investigated. Diethylenetriaminepentaacetic acid (DTPA) was selected as the complexing agent with Tl. A response surface methodology (RSM) was employed to evaluate the influencing factors and optimize Tl and organic removal. The results reveal that the coagulation pH and Fe0 dosage are crucial factors for simultaneous Tl and organic removal. Quadratic models were shown to be adequate for the optimization and prediction of treatment performance. Under optimized conditions of Fe0 dosage of 3.8 g/L, [H2O2]/Fe0 molar ratio of 1.5, initial pH of 2.9, and coagulation pH of 10.5, Tl and TOC removal reached 99% and 80%, respectively. Fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses indicate that oxidation, precipitation, and adsorption contribute to Tl removal. The DTPA was degraded into small molecules that can be strongly adsorbed by the iron hydroxides under alkaline conditions. Five consecutive cyclic tests reusing Fe0 as a catalyst maintained stable and efficient treatment performance. This Fe0-H2O2 Fenton-like technique is a promising approach for the simultaneous removal of Tl and organics from wastewater." @default.
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- W2915396960 date "2019-06-01" @default.
- W2915396960 modified "2023-10-16" @default.
- W2915396960 title "Oxidation and removal of thallium and organics from wastewater using a zero-valent-iron-based Fenton-like technique" @default.
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- W2915396960 doi "https://doi.org/10.1016/j.jclepro.2019.02.205" @default.
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