Abstract This article aims to propose a novel high-efficient, autonomous, hybrid solar air purification, electrical generation and thermal recovery system, and conduct a preliminary feasibility analysis on the proposed system. The main works involve: (1) a short review on PV/T driven purification technology, (2) the introduction on the PV/T driven air purification system based on the heterogeneous photocatalytic reaction principles, (3) the effect of TiO2 concentration on the system solar spectra characteristics, electrical performance, and the solubility of formaldehyde, (4) and the formaldehyde photocatalytic degradation performance under different formaldehyde concentrations in TiO2 nanofluids. The main results are: (1) PV/T technology has huge application potential on the integration with the water or air purification systems. (2) As the increase of TiO2 concentration (0.05–0.12 g/L), the value of short-circuit current presents an obvious decreasing trend. The light transmittance loss of the TiO2 nanofluids layer basically has a little change in the TiO2 concentration range of 0.05–0.08 g/L, while a large decrease when the TiO2 concentration is more than 0.08 g/L. (3) As the increase of TiO2 concentration, the solubility of formaldehyde diminishes except the concentration of 0.05 g/L, which shows that a certain concentration of TiO2 can improve the formaldehyde solubility because the TiO2 particles have abundant hydrophilic groups on the surface. (4) The formaldehyde photocatalytic degradation rate decreases with the formaldehyde concentration in TiO2 nanofluids in the range of formaldehyde concentration of 0.05–0.15 mg/L. The degradation process can be divided into three stages.

中文翻译：

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基于多相光催化反应原理的新型太阳能 PV/T 驱动空气净化系统：简要回顾和初步研究

摘要 本文旨在提出一种新型高效、自主、混合的太阳能空气净化、发电和热回收系统，并对所提出的系统进行初步可行性分析。主要工作包括：（1）PV/T驱动净化技术综述，（2）基于多相光催化反应原理的PV/T驱动空气净化系统介绍，（3）TiO2浓度对空气净化的影响系统太阳光谱特性、电学性能、甲醛溶解度，(4) 以及不同甲醛浓度下TiO2纳米流体中的甲醛光催化降解性能。主要结果是： (1) PV/T技术在与水或空气净化系统集成方面具有巨大的应用潜力。(2)随着TiO2浓度的增加(0.05-0.12g/L)，短路电流值呈现明显的下降趋势。TiO2 纳米流体层的透光率损失在 TiO2 浓度范围在 0.05-0.08 g/L 内基本变化不大，而当 TiO2 浓度大于 0.08 g/L 时，则下降较大。(3)随着TiO2浓度的增加，除0.05g/L外，甲醛的溶解度减小，说明一定浓度的TiO2可以提高甲醛的溶解度，因为TiO2颗粒表面具有丰富的亲水基团。(4)甲醛光催化降解率随着TiO2纳米流体中甲醛浓度在0.05-0.15mg/L范围内而降低。