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We report the potential of a sulfidized nanoscale zerovalent iron–persulfate (S-nZVI-PS) system for in situ chemical oxidation (ISCO) of groundwater pollutants. The study was conducted using a sand-filled rectangular box with a permeable reactive barrier of S-nZVI as a facsimile of the ISCO system. Synthetic water contaminated with a target pollutant (reactive black-5, RB-5) was continuously passed through the box. The injection of PS led to the complete removal of RB-5 and the system remained reactive for approximately 12 days. This system has a benefit that the oxidation products of S-nZVI (i.e., Fe3O4, Fe2O3, and FeSO4) can further activate PS to retain its reactivity. In a separate trial, this method exploited oxidation, reduction, adsorption and co-precipitation mechanisms that conspired to remove two different groundwater pollutants— arsenite and 1,4-dioxane. These results confirmed the utility of S-nZVI-PS as a mediator of ISCO processes to degrade groundwater pollutants.
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•A rectangular box filled with sand was used to monitor the ISCO processes.•Sulfidized nanoscale zerovalent iron–persulfate system is an effective ISCO agent for the removal of groundwater pollutants.•Appreciable efficiency of the system under natural pH is an advantage.•Proposed ISCO system was effective for the removal of mixture of pollutants such as arsenite and 1,4-dioxane.•Process and performance evaluation confirmed the practicability of the S-nZVI-PS system.