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Zhu S, Chen C, Wang Z, Wang C, Luo X. Kinetics of ester-105 degradation by La/TiO 2 photocatalysis. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2023; 58:963-970. [PMID: 37916440 DOI: 10.1080/10934529.2023.2274255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 10/01/2023] [Indexed: 11/03/2023]
Abstract
Lanthanum-doped titanium (La/TiO2) nano-photocatalysts were prepared using the sol-gel method and characterized by X-ray diffraction (XRD), zeta potential, and low-temperature nitrogen adsorption analyses. Ester-105, a flotation collector from beneficiation wastewater, was chosen as the target pollutant. The influence of the initial ester-105 concentration, pH, and photocatalyst dosage on the photocatalytic degradation of ester-105 was investigated. To examine the kinetics of the adsorption and photocatalytic degradation of ester-105, a Langmuir adsorption model and Langmuir-Hinshelwood kinetic models were established and discussed. The synthesized photocatalyst comprised anatase-phase TiO2, with an isoelectric point of pH = 6.5, specific surface area of 56.1626 m2·g-1, and average pore size of 7.78 nm. The maximum adsorption and the adsorption equilibrium constant of La/TiO2 for ester-105 were determined as 0.338 mg·g-1 and 1.008 L·mg-1, respectively. The first-order kinetic reaction rate constant (k) exhibited a linear relationship with the initial ester-105 concentration. The optimal pH for ester degradation was theoretically determined to be 6.95, and the optimum photocatalyst dosage was found to be 0.2739 g·L-1. Experiments confirmed that the photocatalytic degradation of ester-105 using La/TiO2 followed the Langmuir-Hinshelwood kinetics model, thereby providing a theoretical foundation for the photocatalytic degradation of ester-105 for industrial application.
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Affiliation(s)
- Sipin Zhu
- Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Ganzhou, China
- Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Chunfei Chen
- The Peoples Government of Tangnan Township, Nanchang, China
| | - Zhaopeng Wang
- Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Ganzhou, China
- Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Chunying Wang
- Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Ganzhou, China
- Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Xianping Luo
- Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Ganzhou, China
- Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
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Peng K, Liu X, Wu X, Yu H, He J, Chen K, Zhu L, Wang X. Study on the preparation of molecularly imprinted ZrO 2-TiO 2 photocatalyst and the degradation performance of hydroquinone. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:83575-83586. [PMID: 37344713 DOI: 10.1007/s11356-023-28295-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 06/12/2023] [Indexed: 06/23/2023]
Abstract
In this paper, molecularly imprinted Zr-doped TiO2 photocatalysts (MIP-ZrO2-TiO2) were prepared by the molecularly imprinted sol-gel method for the photocatalytic degradation study of hydroquinone (HQ) as the target pollutant. For the effectiveness of the MIP-ZrO2-TiO2 catalyst in degrading HQ, the effects of Zr doping ratio, imprinted molecule dosage, calcination conditions, and pollutant concentration on its photocatalytic activity were investigated. XRD, TEM, XPS, and other techniques were used to evaluate the materials, and the findings revealed that MIP-ZrO2-TiO2 films with imprinted HQ were successfully produced on the ZrO2-TiO2 surface. The optimal preparation conditions were n(Ti):n(Zr) = 100:8, m(HQ) = 1.5 g, 550 °C for the calcination temperature, and 2 h for the calcination duration. The optimum reaction conditions were 10 mg/L HQ concentration, 1 g/L catalyst dose, and a pH of 6.91. According to the findings of photocatalytic tests, during 30 min of UV lamp (365 nm) irradiation, the degradation rates of MIP-ZrO2-TiO2, ZrO2-TiO2, and TiO2 for HQ were 90.58%, 83.94%, and 58.30%, respectively. The findings revealed that the doping of Zr metal and the addition of imprinted molecules improved the photocatalytic activity of TiO2, which can be used for the efficient treatment of low concentrations of hard-to-degrade hydroquinone.
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Affiliation(s)
- Ke Peng
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Xian Liu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Xi Wu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Hang Yu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Jiachen He
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Ke Chen
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Lei Zhu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Xun Wang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China.
- Hubei Provincial Engineering Research Center of Urban Regeneration, Wuhan, 430065, China.
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Synthesis of Oxygen Deficient TiO2 for Improved Photocatalytic Efficiency in Solar Radiation. Catalysts 2021. [DOI: 10.3390/catal11080904] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The photocatalytic activities of TiO2 have been limited mainly to absorbing in the ultraviolet spectrum which accounts for only 5% of solar radiation. High energy band gap and electron recombination in TiO2 nanoparticles are responsible for its limitations as a photocatalyst. An oxygen deficient surface can be artificially created on the titanium oxide by zero valent nano iron through the donation of its excess electrons. A visible light active TiO2 nanoparticle was synthesized in the current investigation through simple chemical reduction using sodium boro-hydride. The physical and textural properties of the synthesized oxygen deficient TiO2 photocatalyst was measured using scanning/ transmission electron microscopy while FTIR, XRD and nitrogen sorption methods (BET) were employed for its further characterizations. Photochemical decoloration of orange II sodium dye solution in the presence of the synthesized TiO2 was measured using an UV spectrophotometer. The resulting oxygen deficient TiO2 has a lower energy band-gap, smaller pore sizes, and enhanced photo-catalytic properties. The decoloration (88%) of orange (II) sodium salt solution (pH 2) under simulated solar light was possible at 20 min. This study highlights the effect of surface oxygen defects, crystal size and energy band-gap on the photo-catalytical property of TiO2 nanoparticles as impacted by nano zero valent iron. It opens a new window in the exploitation of instability in the dopant ions for creation of a visible light active TiO2 photocatalyst.
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Khabibrakhmanov R, Shurukhina A, Rudakova A, Barinov D, Ryabchuk V, Emeline A, Kataeva G, Serpone N. UV-induced defect formation in cubic ZrO2. Optical demonstration of Y, Yb and Er dopants interacting with photocarriers. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wang C, Zeng T, Gu C, Zhu S, Zhang Q, Luo X. Photodegradation Pathways of Typical Phthalic Acid Esters Under UV, UV/TiO 2, and UV-Vis/Bi 2WO 6 Systems. Front Chem 2019; 7:852. [PMID: 31921775 PMCID: PMC6923729 DOI: 10.3389/fchem.2019.00852] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 11/22/2019] [Indexed: 11/13/2022] Open
Abstract
Photolysis and photocatalysis of typical phthalic acid esters (dimethyl phthalate, DMP; diethyl phthalate, DEP; dibutyl phthalate, DBP) were carried out in UV, UV/TiO2, and UV-Vis/Bi2WO6 systems. All of the selected phthalic acid esters and their decomposition byproducts were subjected to qualitative and quantitative analysis through HPLC and GC-MS. The results of 300 min of photolysis and photodegradation reaction were that each system demonstrated different abilities to remove DMP, DEP, and DBP. The UV/TiO2 system showed the strongest degradation ability on selected PAEs, with removal efficiencies of up to 93.03, 92.64, and 92.50% for DMP, DEP, and DBP in 90 min, respectively. UV-Vis/Bi2WO6 had almost no ability to remove DMP and DEP. However, all of the systems had strong ability to degrade DBP. On the other hand, the different systems resulted in various byproducts and PAE degradation pathways. The UV system mainly attacked the carbon branch and produced o-hydroxybenzoates. No ring-opening byproducts were detected in the UV system. In the photocatalytic process, the hydroxyl radicals produced not only attacked the carbon branch but also the benzene ring. Therefore, hydroxylated compounds and ring-opening byproducts were detected by GC-MS in both the UV/TiO2 and UV-Vis/Bi2WO6 photocatalytic systems. However, there were fewer products due to direct hole oxidation in the UV-Vis/Bi2WO6 system compared with the UV/TiO2 system, which mainly reacted with the pollutants via hydroxyl radicals.
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Affiliation(s)
- Chunying Wang
- College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Ting Zeng
- College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Chuantao Gu
- College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
- School of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
| | - Sipin Zhu
- College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Qingqing Zhang
- College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
| | - Xianping Luo
- College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, China
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Fu P, Ma Y, Li G, Lin X. Vertically aligned Pt/TiO 2 nanobelt films on Ti sheets for efficient degradation of a refractory ethyl thionocarbamate collector. RSC Adv 2019; 9:38381-38390. [PMID: 35540220 PMCID: PMC9075886 DOI: 10.1039/c9ra07704a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 11/18/2019] [Indexed: 01/13/2023] Open
Abstract
Noble metal modified TiO2 nanostructures on a substrate featuring a two-dimensional (2D) morphology are of great interest in wastewater remediation due to high photocatalytic activity and avoidance of separating powder catalysts from water. In this work, vertically aligned Pt/TiO2 nanobelt films (Pt/TNFs) on Ti sheets were fabricated via a synthesis strategy including an alkaline hydrothermal treatment and electrostatic self-assembly. The Pt/TNFs had a BET specific surface area of 93.35 m2 g-1, showing high adsorption capacity in removing an ethyl thionocarbamate (ETC) flotation collector. After the deposition with Pt nanoparticles, the photocatalytic activity of the TNFs increased by 94.98% with the enhanced mineralization of the ETC collector. Moreover, the Pt/TNFs on Ti sheets exhibited strong substrate adhesion enabling superior photocatalytic stability in the cyclic degradation of ETC. The solid phase extraction and gas chromatography-mass spectrometry (SPE/GC-MS) analysis revealed that seven byproducts still remained even when 100% of ETC was degraded, showing the difficulty in the complete mineralization of the ETC collector. The Pt/TNF can serve as a promising photocatalyst to treat mineral flotation wastewaters containing organic reagents.
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Affiliation(s)
- Pingfeng Fu
- School of Civil and Resources Engineering, University of Science and Technology Beijing Beijing 100083 China +86 10 82385795 +86 13520202167
- Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education Beijing 100083 China
| | - Yanhong Ma
- School of Civil and Resources Engineering, University of Science and Technology Beijing Beijing 100083 China +86 10 82385795 +86 13520202167
| | - Gen Li
- School of Civil and Resources Engineering, University of Science and Technology Beijing Beijing 100083 China +86 10 82385795 +86 13520202167
| | - Xiaofeng Lin
- School of Civil and Resources Engineering, University of Science and Technology Beijing Beijing 100083 China +86 10 82385795 +86 13520202167
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Fu P, Li G, Wu X, Lin X, Lei B. UV 185+254 nm photolysis of typical thiol collectors: decomposition efficiency, mineralization and formation of sulfur byproducts. ROYAL SOCIETY OPEN SCIENCE 2019; 6:190123. [PMID: 31218054 PMCID: PMC6549947 DOI: 10.1098/rsos.190123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 04/15/2019] [Indexed: 06/09/2023]
Abstract
The decomposition of toxic flotation reagents upon UV185+254 nm irradiation was attractive due to operational simplicity and no dosage of oxidants. In this work, the degradation of typical thiol collectors (potassium ethyl xanthate (PEX), sodium diethyl dithiocarbamate (SDD), O-isopropyl-N-ethyl thionocarbamate (IET) and dianilino dithiophoshoric acid (DDA)) was investigated by UV185+254 nm photolysis. The degradation efficiencies and mineralization extents of collectors were assessed. The formation of CS2 and H2S byproducts was studied, and the mechanisms of collector degradation were proposed under UV185+254 nm irradiation. The PEX, SDD and IET were decomposed with nearly 100% removal upon 75 min of UV185+254 nm irradiation. The decomposition rate constants decreased in the order SDD > PEX > IET ≫ DDA, and the DDA was the refractory collector. After 120 min of UV185+254 nm irradiation, 15-45% of carbon and 25-75% of sulfur of collectors were completely mineralized, and the mineralization extent decreased in the order PEX > SDD > IET > DDA. The percentage of gaseous sulfur (CS2 and H2S) ranged from 0.48 to 4.85% for four collectors, showing the fraction of emitted sulfur byproducts was small. The aqueous CS2 concentration increased in the first 10-20 min, and was decreased to a low level of 0.05-0.1 mg l-1 at 120 min. Two mechanisms, i.e. direct UV254 nm photolysis and indirect oxidation with free radicals, were responsible for collector decomposition in the UV185+254 nm photolysis.
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Affiliation(s)
- Pingfeng Fu
- School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
- Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, People's Republic of China
| | - Gen Li
- School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Xiaoting Wu
- School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Xiaofeng Lin
- School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Bolan Lei
- School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
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Parnicka P, Mazierski P, Grzyb T, Lisowski W, Kowalska E, Ohtani B, Zaleska-Medynska A, Nadolna J. Influence of the preparation method on the photocatalytic activity of Nd-modified TiO 2. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2018; 9:447-459. [PMID: 29515957 PMCID: PMC5815290 DOI: 10.3762/bjnano.9.43] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 01/08/2018] [Indexed: 06/15/2023]
Abstract
Nd-modified TiO2 photocatalysts have been obtained via hydrothermal (HT) and sol-hydrothermal (SHT) methods. The as-prepared samples were characterized by X-ray diffraction (XRD), BET surface area measurements, scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), luminescence spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the synthesized samples was evaluated by the degradation of phenol in aqueous solution under irradiation with UV-vis (λ > 350 nm) and vis (λ > 420 nm) light, as well as by the degradation of gaseous toluene under irradiation with vis (λmax = 415 nm) light. It was found that Nd-modified TiO2 is an efficient photocatalyst for the degradation of phenol and toluene under visible light. XPS analysis revealed that the photocatalyst prepared via HT method contains a three-times higher amount of hydroxy groups at the surface layer and a two-times higher amount of surface defects than that obtained by the SHT method. The photocatalytic efficiency of phenol and toluene degradation under vis irradiation in the presence of 0.25% Nd-TiO2(HT) reached 0.62 and 3.36 μmol·dm-1·min-1, respectively. Photocatalytic activity tests in the presence of Nd-TiO2 and scavenger confirm that superoxide radicals were responsible for the visible light-induced degradation of the model pollutant in aqueous solution.
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Affiliation(s)
- Patrycja Parnicka
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland
| | - Paweł Mazierski
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland
| | - Tomasz Grzyb
- Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University in Poznan, 60-780 Poznan, Poland
| | - Wojciech Lisowski
- Institute of Physical Chemistry, Polish Academy of Sciences,01-224 Warsaw, Poland
| | - Ewa Kowalska
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Bunsho Ohtani
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | | | - Joanna Nadolna
- Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland
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