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Wang L, Fu W, Sun S, Liu H, Wang J, Zhong W, Ma B. Preparation, characterization, and removal of nitrate from water using vacant polyoxometalate/TiO 2 composites. ENVIRONMENTAL TECHNOLOGY 2023; 44:3393-3404. [PMID: 35324393 DOI: 10.1080/09593330.2022.2058424] [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: 12/09/2021] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
Due to the rapid development of industry and agriculture, nitrate pollution in groundwater has been continuously increasing. NO3-N is a chemically stable nitrogen species and is quite difficult to remove. In this study, using heteropoly silicotungstate K8[α-SiW11O39] and Cu2+ as the active components, SiW11 and Cu2+ were loaded onto TiO2 by a sol-gel method to prepare a composite photocatalyst SiW11/TiO2/Cu. The photocatalytic reduction of dissolved NO3-N was subsequently performed using SiW11/TiO2/Cu under UV irradiation, and the influence of different experimental parameters on the photocatalytic performance was investigated. The mechanism of NO3-N reduction by the composite catalyst was also investigated. Free radicals existing within the system were detected by ESR spectroscopy, and the results indicated that C O 2 - anion free-radicals were generated by the reaction of photogenerated holes and formic acid (HCOOH). At a SiW11/TiO2/Cu dose of 1.2 g L-1 and in the presence of HCOOH as a hole scavenger, the proposed composite catalytically reduced NO3-N anddemonstrated significantadvantages in terms of its photocatalytic activity in comparison with pure TiO2. In particular, the removal efficiency of NO3-N and the selectivity of nitrogen achieved a maximum of 96% and 77%, respectively.
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Affiliation(s)
- Lingsheng Wang
- College of Resources and Environment, Shandong Agricultural University, Taian, People's Republic of China
| | - Weizhang Fu
- College of Resources and Environment, Shandong Agricultural University, Taian, People's Republic of China
| | - Shujuan Sun
- College of Resources and Environment, Shandong Agricultural University, Taian, People's Republic of China
| | - Huaihao Liu
- College of Resources and Environment, Shandong Agricultural University, Taian, People's Republic of China
| | - Jinhua Wang
- College of Resources and Environment, Shandong Agricultural University, Taian, People's Republic of China
| | - Wanzhen Zhong
- College of Resources and Environment, Shandong Agricultural University, Taian, People's Republic of China
| | - Bin Ma
- Tai'an City Management Comprehensive Service Center, Taian, People's Republic of China
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de Assis MLM, Junior ED, de Almeida JMF, do Nascimento Silva I, Barbosa RV, Dos Santos LM, Dias EF, Fernandes NS, Martinez-Huitle CA. Photocatalytic degradation of Novacron blue and Novacron yellow textile dyes by the TiO 2/palygorskite nanocomposite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:64440-64460. [PMID: 34312752 DOI: 10.1007/s11356-021-15519-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 07/15/2021] [Indexed: 06/13/2023]
Abstract
The photocatalytic discoloration of industrial dyes, Novacron blue (NB) and Novacron yellow (NY), was investigated using composites based on TiO2 and natural palygorskite (Pal-Ti10 and Pal-Ti30). The method consisted of synthesizing the composites starting from a physical mixture of TiO2 and natural palygorskite in the presence of alcohol, for impregnation through calcination under conditions of temperature equal to 450 °C and atmospheric air. The characterization techniques used in this work were FTIR, XRD, XRF, SEM, particle size analysis and zeta potential. The photocatalysis for the NB dye was investigated through the application of a factorial 24 experimental design, aiming at the best experimental conditions and finally applying them in another NY industrial dye. The investigated concentrations of NB were 10 ppm and 30 ppm, the composites were synthesized using 10 and 30% (p/p) of titanium dioxide in palygorskite, the two pH values were 2.0 and 6.0 and the light intensities 9 and 18 W were used. Tests performed at pH 2.0, Pal-Ti30 composite, power 18 W and 10 ppm of dye showed 100% color removal of both dyes in 90 min. The bleaching process followed the pseudo-first order kinetic model, and the apparent constants (Kapp) were 0.0216 min-1 and 0.0193 min-1 for NB and NY dyes, respectively. The results of total organic carbon (TOC) showed mineralization of 61.70% and 58.06% for NB and NY, respectively, in 90 min of treatment, and the by-products were detected by GC-MS.
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Affiliation(s)
- Mikaely Lizandra Moreira de Assis
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Elmar Damasceno Junior
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil.
| | - Janiele Mayara Ferreira de Almeida
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Isabel do Nascimento Silva
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Rodrigo Victor Barbosa
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Lamara Maciel Dos Santos
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Elizete Faustino Dias
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Nedja Suely Fernandes
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Química Analítica e Meio Ambiente-LAQUAM, Campus Universitário Lagoa Nova, Natal, RN, Brasil
| | - Carlos Alberto Martinez-Huitle
- Universidade Federal do Rio Grande do Norte, Instituto de Química, Laboratório de Eletroquímica Ambiental e Aplicada-LEAA, Campus Universitário Lagoa Nova, Natal, RN, Brasil
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Yang M, Ma R, Chen L, Zhang C, Cao R, Wen Q. Preparation and photo-catalytic performance of β2-SiW11/PANI/TiO2 photo-catalyst. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1849641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Mingrui Yang
- College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer, China
| | - Ronghua Ma
- College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer, China
| | - Lin Chen
- College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer, China
| | - Chengli Zhang
- College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer, China
| | - Rui Cao
- College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer, China
| | - Qi Wen
- College of Chemistry and Chemical Engineering, Qiqihaer University, Qiqihaer, China
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