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Chen F, Yang M, Shi X, Qin X, Chen Q, Jiang L, Jia C. Ag–TiO2 mesocrystal-coupled g-C3N4 nanosheets with enhanced visible-light photocatalytic activity. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04903-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Bio-capped and green synthesis of ZnO/g-C3N4 nanocomposites and its improved antibiotic and photocatalytic activities: An exceptional approach towards environmental remediation. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.07.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Rakshitha R, Gurupadayya B, Devi SHK, Pallavi N. Coprecipitation aided synthesis of bimetallic silver tungstate: a response surface simulation of sunlight-driven photocatalytic removal of 2,4-dichlorophenol. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:59433-59443. [PMID: 35386079 DOI: 10.1007/s11356-022-20062-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
In the present study, the response surface methodology (RSM) model was used to investigate the photocatalytic performance of silver tungstate (Ag2WO4) in the removal of 2,4-dichlorophenol (2,4-DCP) under natural sunlight. The Ag2WO4 which has nanoflower-like structure was synthesized by a coprecipitation method. The synthesized photocatalyst was characterized for FESEM, TEM, EDX, XRD, FTIR, and UV-Vis spectroscopy. RSM was employed to scrutinize the suitable model to yield a profound pollutant removal rate. The four independent factors such as pollutant concentration, catalyst dosage, pH, and contact time are simulated using RSM. A total of 91% of 2,4-DCP degradation was achieved at a higher catalyst dosage and lower pollutant concentration with a contact duration of 8 h in an alkaline pH condition. The coefficient of regression (R2) and probability value (P) were 0.98 and 0.0472, respectively, which confirmed the ideality of RSM modeling. The study discusses on the possible photocatalytic degradation mechanisms of 2,4-DCP. The results showed a significant dependence of the photocatalytic removal of 2,4-DCP on the functional parameters.
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Affiliation(s)
- Rajashekara Rakshitha
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India
| | - Bannimath Gurupadayya
- Department of Pharmaceutical Chemistry, JSS Academy of Higher Education and Research, JSS College of Pharmacy, Mysuru, 570015, India
| | | | - Nagaraju Pallavi
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India.
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Zada A, Khan M, Hussain Z, Shah MIA, Ateeq M, Ullah M, Ali N, Shaheen S, Yasmeen H, Ali Shah SN, Dang A. Extended visible light driven photocatalytic hydrogen generation by electron induction from g-C3N4 nanosheets to ZnO through the proper heterojunction. Z PHYS CHEM 2021. [DOI: 10.1515/zpch-2020-1778] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Abstract
The alarming energy crises has forced the scientific community to work for sustainable energy modules to meet energy requirements. As for this, ZnO/g-C3N4 nanocomposites with proper heterojunction were fabricated by coupling a proper amount of ZnO with 2D graphitic carbon nitride (g-C3N4) nanosheets and the obtained nanocomposites were applied for photocatalytic hydrogen generation from water under visible light illumination (λ > 420 nm). The morphologies and the hydrogen generation performance of fabricated photocatalysts were characterized in detail. Results showed that the optimized 5ZnO/g-C3N4 nanocomposite produced 70 µmol hydrogen gas in 1 h compare to 8 µmol by pure g-C3N4 under identical illumination conditions in the presence of methanol without the addition of cocatalyst. The much improved photoactivities of the nanocomposites were attributed to the enhanced charge separation through the heterojunction as confirmed from photoluminescence study, capacity of the fabricated samples for •OH radical generation and steady state surface photovoltage spectroscopic (SS-SPS) measurements. We believe that this work would help to fabricate low cost and effective visible light driven photocatalyst for energy production.
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Affiliation(s)
- Amir Zada
- Department of Chemistry, Abdul Wali Khan University Mardan , Mardan 23200 , Pakistan
| | - Muhammad Khan
- Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University , Xi’an 710072 , China
| | - Zahid Hussain
- Department of Chemistry, Abdul Wali Khan University Mardan , Mardan 23200 , Pakistan
| | | | - Muhammad Ateeq
- Department of Chemistry, Abdul Wali Khan University Mardan , Mardan 23200 , Pakistan
| | - Mohib Ullah
- Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology , Harbin 150080 China
| | - Nauman Ali
- Institute of Chemical Sciences, University of Peshawar , Peshawar , Pakistan
| | - Shabana Shaheen
- Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials Science, International Joint Research Center for Catalytic Technology , Harbin 150080 China
| | - Humaira Yasmeen
- Key Laboratory of Bio-Based Material Science and Technology, Ministry of Education, Northeast Forestry University , Harbin 150040 , China
| | - Syed Niaz Ali Shah
- Department of Chemistry, Abdul Wali Khan University Mardan , Mardan 23200 , Pakistan
| | - Alei Dang
- Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University , Xi’an 710072 , China
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Zada A, Khan M, Khan MA, Khan Q, Habibi-Yangjeh A, Dang A, Maqbool M. Review on the hazardous applications and photodegradation mechanisms of chlorophenols over different photocatalysts. ENVIRONMENTAL RESEARCH 2021; 195:110742. [PMID: 33515579 DOI: 10.1016/j.envres.2021.110742] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 11/28/2020] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
Chlorophenols are very important environmental pollutants, which have created huge problems for both aquatic and terrestrial lives. Therefore, their removal needs urgent, effective, and advanced technologies to safeguard our environment for future generation. This review encompasses a comprehensive study of the applications of chlorophenols, their hazardous effects and photocatalytic degradation under light illumination. The effect of various factors such as pH and presence of different anions on the photocatalytic oxidation of chlorophenols have been elaborated comprehensively. The production of different oxidizing agents taking part in the photodegradation of chlorophenols are given a bird eye view. The photocatalytic degradation mechanism of different chlorophenols over various photocatalyts has been discussed in more detail and elaborated that how different photocatalysts degrade the same chlorophenols with the aid of different oxidizing agents produced during photocatalysis. Finally, a future perspective has been given to deal with the effective removal of these hazardous pollutants from the environment.
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Affiliation(s)
- Amir Zada
- Department of Chemistry, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan
| | - Muhammad Khan
- Shaanxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China; Department of Chemistry, University of Okara, Renala Khurd, Punjab, Pakistan
| | - Muhammad Asim Khan
- School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Qasim Khan
- College of Electronic Science and Technology, Shenzhen University, Shenzhen, Guangdong, 518000, China
| | - Aziz Habibi-Yangjeh
- Applied Chemistry Department, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Alei Dang
- Department of Chemistry, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan
| | - Muhammad Maqbool
- Department of Clinical & Diagnostic Sciences, Health Physics Program, The University of Alabama at Birmingham, AL, 35294, USA.
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Khan WA, Arain MB, Bibi H, Tuzen M, Shah N, Zada A. Selective electromembrane extraction and sensitive colorimetric detection of copper(II). Z PHYS CHEM 2020. [DOI: 10.1515/zpch-2020-1761] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In this study, an extremely effective electromembrane extraction (EME) method was developed for the selective extraction of Cu(II) followed by Red-Green-Blue (RGB) detection. The effective parameters optimized for the extraction efficiency of EME include applied voltage, extraction time, supported liquid membrane (SLM) composition, pH of acceptor/donor phases, and stirring rate. Under optimized conditions, Cu(II) was extracted from a 3 mL aqueous donor phase to 8 µL of 100 mM HCl acceptor solution through 1-octanol SLM using an applied voltage of 50 V for 15 min. The proposed method provides a working range of 0.1–0.75 µg·mL−1 with 0.03 µg·mL−1 limit for detection. Finally, the developed technique was applied to different environmental water samples for monitoring environmental pollution. Obtained relative recoveries were within the range of 93–106%. The relative standard deviation (RSD) and enhancement factor (EF) were found to be ≤4.8% and 100 respectively. We hope that this method can be introduced for quantitative determination of Cu(II) as a fast, simple, portable, inexpensive, effective, and precise procedure.
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Affiliation(s)
- Wajid Ali Khan
- Department of Chemistry , Abdul Wali Khan University , 23200 , Mardan , KPK , Pakistan
| | - Muhammad Balal Arain
- Department of Chemistry , Abdul Wali Khan University , 23200 , Mardan , KPK , Pakistan
- Department of Chemistry , University of Karachi , 75270 , Karachi , Pakistan
| | - Hashmat Bibi
- Department of Chemistry , Abdul Wali Khan University , 23200 , Mardan , KPK , Pakistan
| | - Mustafa Tuzen
- Tokat Gaziosmanpaşa University , Department of Chemistry , 60250 , Tokat , Turkey
| | - Nasrullah Shah
- Department of Chemistry , Abdul Wali Khan University , 23200 , Mardan , KPK , Pakistan
| | - Amir Zada
- Department of Chemistry , Abdul Wali Khan University , 23200 , Mardan , KPK , Pakistan
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