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Wang J, Du X, Wang Z, Wu P, Zhou J, Tao X, Dang Z, Lu G. Optimization and verification of selective removal of organophosphate esters from wastewater by molecularly imprinted adsorbent. CHEMOSPHERE 2024; 350:141082. [PMID: 38169198 DOI: 10.1016/j.chemosphere.2023.141082] [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: 09/25/2023] [Revised: 12/22/2023] [Accepted: 12/28/2023] [Indexed: 01/05/2024]
Abstract
Tributyl phosphate (TNBP), a new type of flame retardant, is an emerging pollutant and has been frequently detected in various matrices such as wastewater. Efficient removal of TNBP is critical for wastewater treatment. In this study, molecularly imprinted polymer (MIP) was prepared using precipitation polymerization for selective adsorption of TNBP. The results showed that MIP had a porous structure and formed effective imprinting cavities, which was primarily responsible for its superior adsorption ability. The adsorption of TNBP by MIP was carried out following both the pseudo-secondary kinetic model and the Langmuir isothermal adsorption model. MIP adsorbed TNBP rapidly and reached adsorption equilibrium within 30 min with 923 μmol g-1 at 298 K. The adsorption capacity and adsorption rate of MIP were respectively 2 and 5.49 times those of non-molecularly imprinted polymers. In addition, MIP could effectively counter disturbances from external parameters like temperature and pH, exhibiting strong environmental flexibility. MIP can specifically adsorb organophosphate esters, and can selectively adsorb TNBP under the interference of coexisting contaminants such as1,3-diphenylguanidine and isazofos. In actual bodies of water, MIP's highly selective adsorption of TNBP retains its advantage. The selective adsorption of MIP was mainly due to the common phosphate skeleton, and the specific substituent of organophosphate esters played an important role in the imprinting process. Hydrogen bonding might be involved in the polymerization process of TNBP with acrylamide and the adsorption process of TNBP by MIP.MIP exhibited good reuse efficiency, the total adsorption capacity decreased by no more than 25% after 7 reuse cycles. This study provides a simple and efficient method for selective removal of organophosphate from wastewater.
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Affiliation(s)
- Juan Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Xiaodong Du
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
| | - Zuifei Wang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Peiwen Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Jiangmin Zhou
- College of Life and Environmental Sciences, Wenzhou University, Wenzhou, 325035, China
| | - Xueqin Tao
- College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou, 510225, China
| | - Zhi Dang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, 510006, China
| | - Guining Lu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou, 510006, China.
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Li M, Zhang R, Zou Z, Zhang L, Ma H. Optimizing physico-chemical properties of hierarchical ZnO/TiO 2 nano-film by the novel heating method for photocatalytic degradation of antibiotics and dye. CHEMOSPHERE 2024; 346:140392. [PMID: 37852380 DOI: 10.1016/j.chemosphere.2023.140392] [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: 07/05/2023] [Revised: 09/17/2023] [Accepted: 10/06/2023] [Indexed: 10/20/2023]
Abstract
The design of semiconductor catalysts with excellent photocatalytic properties, stability, recyclability, and good separation for the treatment of polluted water is still challenging. In this paper, the ZnO/TiO2 nano-thin films were fabricated using the magnetron sputtering technique and then heating the underlying ZnO layer and the upper TiO2 layer for their respective optimal heating time, i. e. heating ZnO for 3 h and heating TiO2 for 2 h. The as-prepared films were characterized. The results show that the preferred growth of TiO2 grains along the [001] axis, relatively large specific surface area, and increased amounts of surface oxygen vacancies (OVs) were induced to the heterojunction catalysts through this optimized heating strategy, which boosts the photocatalytic activity of ZnO/TiO2 nano-film. The degradation experiment inndicates that the ciprofloxacin (CIP) removal efficiency can reach 97.3% in 2 h duration, which was higher than that of the samples annealed for the same periods. Meanwhile, the prepared ZnO/TiO2 photocatalytic film exhibited favorable stability of 95.5% degradation efficiency after the fourth run and general applicability for the photodegradation of various contantains, whih removed 99.5% of ofloxacin (OFX) and 77.6% of tetracycline (TC) in 2 h and 94.1% of Rhodamine B (RhB) in 1 h. This work is expected to yields a novel insight into the production of heterojunction photocatalysts with excellen ability for photocatalytic degradation of pollutants in the practical industry.
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Affiliation(s)
- Min Li
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China
| | - Ruiyang Zhang
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China
| | - Zhipeng Zou
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China
| | - Lan Zhang
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China.
| | - Huizhong Ma
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China.
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Rusek J, Baudys M, Toker O, Paušová Š, Paz Y, Krýsa J. Composite TiO 2 films modified by CeO 2 and SiO 2 for the photocatalytic removal of water pollutants. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2022; 21:2127-2138. [PMID: 35982381 DOI: 10.1007/s43630-022-00283-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 08/01/2022] [Indexed: 12/13/2022]
Abstract
TiO2 particles of high photocatalytic activity immobilised on various substrates usually suffer from low mechanical stability. This can be overcome by the utilisation of an inorganic binder and/or incorporation in a robust hydrophobic matrix based on rare-earth metal oxides (REOs). Furthermore, intrinsic hydrophobicity of REOs may result in an increased affinity of TiO2-REOs composites to non-polar aqueous pollutants. Therefore, in the present work, three methods were used for the fabrication of composite TiO2/CeO2 films for photocatalytic removal of dye Acid Orange 7 and the herbicide monuron, as representing polar and non-polar pollutants, respectively. In the first method, the composition of a paste containing photoactive TiO2 particles and CeCl3 or Ce(NO3)3 as CeO2 precursors was optimised. This paste was deposited on glass by doctor blading. The second method consisted of the deposition of thin layers of CeO2 by spray coating over a particulate TiO2 photocatalyst layer (prepared by drop casting or electrophoresis). Both approaches lead to composite films of similar photoactivity that of the pure TiO2 layer, nevertheless films made by the first approach revealed better mechanical stability. The third method comprised of modifying a particulate TiO2 film by an overlayer based on colloidal SiO2 and tetraethoxysilane serving as binders, TiO2 particles and cerium oxide precursors at varying concentrations. It was found that such an overlayer significantly improved the mechanical properties of the resulting coating. The use of cerium acetylacetonate as a CeO2 precursor showed only a small increase in photocatalytic activity. On the other hand, deposition of SiO2/TiO2 dispersions containing CeO2 nanoparticles resulted in significant improvement in the rate of photocatalytic removal of the herbicide monuron.
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Affiliation(s)
- Jakub Rusek
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technická 5, Prague 6, 16628, Czech Republic
| | - Michal Baudys
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technická 5, Prague 6, 16628, Czech Republic
| | - Omri Toker
- Department of Chemical Engineering, Technion, 3200003, Haifa, Israel
| | - Šárka Paušová
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technická 5, Prague 6, 16628, Czech Republic
| | - Yaron Paz
- Department of Chemical Engineering, Technion, 3200003, Haifa, Israel
| | - Josef Krýsa
- Department of Inorganic Technology, University of Chemistry and Technology Prague, Technická 5, Prague 6, 16628, Czech Republic.
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