| Photovoltaic-photocatalytic hybrid system combined photocatalytic oxidation andphotovoltaic electricity generation technology based on spectral division technologyto realize the purification of wastewater by solar energy. The ultraviolet(UV)spectrum was employed to degrade organic pollutants and the visible andnear-infrared(NIR) spectrum reached surface of solar cells could provide power forthe circulation of wastewater. Moreover, far-infrared(FIR) spectrum was almostabsorbed by wastewater to keep the photovoltaic module working under a lowertemperature.Firstly，the solar water purification and renewable electricity generation system（SOLWAT）was constructed and its optical constructionwas analyzed theoretically.Then the influence of whole spectrum transmittance on SOLWAT systemphotovoltaic performance was investigated. Secondly, the self-sufficient performanceof SOLWAT system was studied under practical conditions. The effects ofphotovoltaic module temperature and liquid absorption on electricity generationefficiency were investigated. Finally, the photocatalytic and photovoltaic performanceof SOLWAT system was investigated when degrading Methylene Blue, Acid Red26or4-Chlorophenol with different initial concentrations.From the theoretical analysis and experimental results, we could get theconclusion as following.1.The equation of normalized photocurrent density couldonly be applied for homogeneous medium, while had a deviation applied inheterogeneous medium;2.The technology of spectral division could be realized inSOLWAT, leading to the self-sufficient operation of SOLWAT system without anynon-regeneration energy;3.Due to the cooling effect of circular fluid, the photovoltaicmodule working temperature of SOLWAT system were lower than that of referencesystem;4.For the degradation of organic pollutions, the two colorful simulatedwastewater fully faded. The degradation rate and the mineralization rate of threesimulated organic pollutants could achieved99%and be above80%respectively,resulting in the complete purification of8L simulated wastewater. The photocatalyticdegradation reaction kinetics was all consistent with the first order kinetics;5.The generating efficiency increased with the degradation of organic pollutions. However,due to the spectrum absorption and optical scattering of suspended catalyst particles,the comprehensive electricity generation efficiency of SOLWAT system was lowerthan that of reference system.In conclusion, SOLWAT system could combine photovoltaic and photocatalyticfunctions by taking advantages of spectrum division technology, providing a newaccessible routine for the industrialization of photocatalytic purifying wastewater bysolar energy. |
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