基于非均相光催化氧化的光伏-热电水处理系统

Abstract This study introduces an integrated bifacial photovoltaic–thermoelectric generator (PV–TEG) system coupled with heterogeneous photocatalysis for simultaneous wastewater treatment and energy generation under concentrated solar irradiation conditions. To address the limited utilization of high-energy ultraviolet (UV) light by conventional photovoltaic materials, the system incorporates a monocrystalline silicon PV cell—known for its weak UV absorption—and leverages a photocatalytic materials to enhance spectral harvesting in the UV region. Designed for bifacial exposure, the system receives simulated sunlight on both sides, with the front side exposed to standard solar simulation and the backside heated via an electric heating plate to emulate irradiance ranging from 1000 to 5000 W/m 2 . Two model dye pollutants, Ponceau 2R and methylene blue (MB), were selected to evaluate system performance under varying pollutant concentrations and irradiance levels. Complete decolorization was achieved, with faster degradation rates observed at higher irradiance. The degradation reactions followed first-order kinetics, revealing a decreasing reaction rate constant with increasing dye concentration. In addition to effective dye removal, the system maintained stable power output, although the presence of MB resulted in a short-circuit current loss of up to 21.6 % relative to a reference PV cell. Under an irradiance of 5000 W/m 2 with 5 mg/L dye concentration, the PV component yielded 0.795 W (Ponceau 2R) and 0.792 W (MB), while the TEG produced 0.067 W and 0.068 W, respectively. Temperature variations across the PV and TEG modules remained minimal, indicating consistent thermal operation. These results confirm the feasibility of integrating photocatalysis with bifacial PV–TEG systems for dual-function applications. The hybrid configuration demonstrates a synergistic approach to solar-driven environmental remediation and energy harvesting, offering promising potential for sustainable and decentralized treatment systems.