Abstract
To match the relentless pursuit of three research hot points - efficient solar utilization, green and sustainable remediation of wastewater and advanced oxidation processes, solar-mediated thermo-electrochemical oxidation of surfactant was proposed and developed for green remediation of surfactant wastewater. The solar thermal electrochemical process (STEP), fully driven with solar energy to electric energy and heat and without an input of other energy, sustainably serves as efficient thermo-electrochemical oxidation of surfactant, exemplified by SDBS, in wastewater with the synergistic production of hydrogen. The electrooxidation-resistant surfactant is thermo-electrochemically oxidized to CO2 while hydrogen gas is generated by lowing effective oxidation potential and suppressing the oxidation activation energy originated from the combination of thermochemical and electrochemical effect. A clear conclusion on the mechanism of SDBS degradation can be proposed and discussed based on the theoretical analysis of electrochemical potential by quantum chemical method and experimental analysis of the CV, TG, GC, FT-IR, UV-vis, Fluorescence spectra and TOC. The degradation data provide a pilot for the treatment of SDBS wastewater that appears to occur via desulfonation followed by aromatic-ring opening. The solar thermal utilization that can initiate the desulfonation and activation of SDBS becomes one key step in the degradation process.
Highlights
Pt sheet (20 mm × 20 mm) working electrode and stainless steel sheet counter electrode were used in the SDBS wastewater degradation experiment
The products of STEP degradation were identified by UV-Vis and FT-IR and the determined quantitatively by Gas Chromatograph
IR-spectra were measured in KBr pellets from 4000–400 cm−1 using a Tensor 27 FT-IR Spectrometer
Summary
The experimental apparatus, described as our paper[21] and detailed in electronic supporting information (ESI), combined with three parties of photoelectric, photothermal and electrochemical units (Thermo-Electro-Reactor) to treat the wastewater containing SDBS as shown in Fig. S2 (ESI). Pt sheet (20 mm × 20 mm) working electrode and stainless steel sheet counter electrode were used in the SDBS wastewater degradation experiment.
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