Photocatalytic kinetics and cyclic stability of photocatalysts Fe-complex/TiO 2 in the synergistic degradation of phenol
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RESEARCH ARTICLE
Photocatalytic kinetics and cyclic stability of photocatalysts Fe-complex/TiO2 in the synergistic degradation of phenolic pollutants and reduction of Cr(VI) Tongtong Guo 1 & Shuang Yang 1 & Yunning Chen 1 & Lu Yang 1 & Yingnan Sun 2 & Qingkun Shang 1 Received: 14 February 2020 / Accepted: 11 October 2020 # The Author(s) 2020
Abstract In this paper, the kinetic characteristics and cycle stability of Fe-complex/TiO2 in the process of degradation of phenolic pollutants and reduction of heavy metal Cr(VI) were studied systematically. First, the structural characteristics and photocatalytic activities of Fe(III)-(8-hydroxyquinoline-5-carboxylic acid)-TiO2 (Fe-HQC-TiO2) nanoparticle to degrade phenolic pollutants and reduce Cr(VI) simultaneously had been investigated. Compared with the single degradation, the efficiency of synergistic degradation/reduction had been improved and the degradation/reduction rate had been obviously accelerated. In particular, the cyclic stability of Fe-HQC-TiO2 photocatalyst decreased obviously when it was used to reduce Cr(VI) alone, but it could still keep above 90% after three cycles when it was used for reduction of Cr(VI) and degradation of phenol synergistically. Second, to Fe-HQS/TiO2 nanoparticle or Fe-HQS/TiO2 nanotube (HQS (8-hydroxyquinoline-5-sulfonic acid)), the synergistic degradation/ reduction (2,4-dichlorophenol/Cr(VI)) efficiencies were always greater than those of a single degradation/reduction and the time was greatly reduced. All the results indicated that there were interactions between Cr(VI) and phenol or 2,4-dichlorophenol in the photocatalytic process. The possible mechanism of synergistic accelerated degradation of phenolic compounds and reduction of Cr(VI) was proposed by analyzing and testing the surface characteristics of photocatalyst and the properties of photocatalytic system during the synergistic degradation/reduction. Keywords Photocatalysis . Simultaneous degradation/reduction . Kinetics . Cyclic stability
Introduction The photocatalytic activity of TiO2 had been realized many years since Honda-Fujishima’s famous work (Fujishima and Honda 1972). Because the band gap of TiO2 is 3.2 eV, only ultraviolet light can stimulate its photocatalytic activity, which Shuang Yang contributed equally to this work. Responsible Editor: Sami Rtimi Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-11220-1) contains supplementary material, which is available to authorized users. * Qingkun Shang [email protected] 1
School of Chemistry, Northeast Normal University, Changchun 130024, People’s Republic of China
2
School of Environment, Northeast Normal University, Changchun 130024, People’s Republic of China
means that it can only use about 4% of the solar spectrum. Therefore, the development of TiO2 composite photocatalyst with visible light response has become a focus of attention in the field of photocatalysis. Scientists had made many achievements in recent years. One way is to dope elements
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