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Thoumrungroj A, Wongtongprapun S, Tuntithavornwat S, Saisawang C, Sangkhanak S, Wongyongnoi P, Serivalsatit K, Hunsom M. Photocatalytic Gold Recovery from Industrial Gold Plating Effluent by ZnO Nanoparticles: Optimum Condition and Possible Applications. ACS Omega 2023; 8:45096-45108. [PMID: 38046310 PMCID: PMC10688215 DOI: 10.1021/acsomega.3c07336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 10/20/2023] [Accepted: 10/26/2023] [Indexed: 12/05/2023]
Abstract
The comparative study of photocatalytic gold recovery from cyanide-based gold plating solution was explored via commercial and hydrothermally synthesized ZnO nanoparticles (NPs). The effects of hydrothermal temperatures on the properties and photocatalytic activities of synthesized ZnO NPs were investigated. In addition, the effects of operating parameters including types of hole scavenger, concentrations of the best hole scavenger, the initial pH of wastewater, and photocatalyst dosages were examined. The obtained results demonstrated that the commercial ZnO NPs exhibited a higher photocatalytic activity for gold recovery than that of the synthesized ones owing to their good crystal quality and the presence of non-lattice zinc ions and appropriate non-lattice oxygen ions. Via the commercial ZnO NPs, the gold ions were almost completely recovered from the cyanide-based gold plating effluent within 7 h at an initial pH of 11.0 in the presence of 10 vol % C2H5OH and 1.0 g/L of photocatalyst loading with a pseudo-first-order rate constant of 0.2637 h-1. Finally, the resultant gold-decorated ZnO NPs exhibited a higher photocatalytic property for color reduction from industrial wastewater and antibacterial activity than that of fresh ZnO NPs. The results obtained in this study possess benefits and pave the way for waste remediation and management for the plating industries.
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Affiliation(s)
- Auttawit Thoumrungroj
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Suchalee Wongtongprapun
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Soontorn Tuntithavornwat
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand
- Advanced
Microfabrication and Biomaterial for Organ-on-chip Research Unit (AMBiO),
Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Chonticha Saisawang
- Institute
of Molecular Biosciences, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Satjaporn Sangkhanak
- Department
of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Panuwat Wongyongnoi
- Department
of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Karn Serivalsatit
- Department
of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Mali Hunsom
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand
- Royal
Society
of Thailand (AFRST), Bangkok 10300, Thailand
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Kunthakudee N, Ramakul P, Serivalsatit K, Hunsom M. Photosynthesis of Au/TiO(2) nanoparticles for photocatalytic gold recovery from industrial gold-cyanide plating wastewater. Sci Rep 2022; 12:21956. [PMID: 36535954 DOI: 10.1038/s41598-022-24290-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 11/14/2022] [Indexed: 12/23/2022] Open
Abstract
A series of Aux/TiO2 nanoparticles (NPs) with different gold loadings (x = 0.1-1.0 wt%) was synthesized by the photodeposition and then employed as photocatalysts to recover precious component from the industrial gold-cyanide plating wastewater. Effects of Au loading, catalyst dosage and types of hole scavenger on the photocatalytic gold recovery were investigated under ultraviolet-visible (UV-Vis) light irradiation at room temperature. It was found that different Au loadings tuned the light absorption capacity of the synthesized photocatalysts and enhanced the photocatalytic activity in comparison with the bare TiO2 NPs. The addition of CH3OH, C2H5OH, C3H8O, and Na2S2O3 as a hole scavenger significantly promoted the photocatalytic activity of the gold recovery, while the H2O2 did not. Among different hole scavengers employed in this work, the CH3OH exhibited the highest capability to promote the photocatalytic gold recovery. In summary, the Au0.5/TiO2 NPs exhibited the best photocatalytic activity to completely recover gold ions within 30 min at the catalyst dosage of 0.5 g/L, light intensity of 3.20 mW/cm2 in the presence of 20 vol% CH3OH as hole scavenger. The photocatalytic activity slightly decreased after the 5th cycle of recovery process, indicating its high reusability.
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Mersel M, Fodor L, Pekker P, Jakab M, Makó É, Horváth O. Effects of Preparation Conditions on the Efficiency of Visible-Light-Driven Hydrogen Generation Based on Cd0.25Zn0.75S Photocatalysts. Catalysts 2021; 11:1534. [DOI: 10.3390/catal11121534] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Photocatalytic H2 production utilizing H2S, an industrial side-product, is regarded as an environmentally friendly process to produce clean energy through direct solar energy conversion. For this purpose, sulfide-based materials, such as photocatalysts, have been widely used due to their good solar response and high photocatalytic activity. In this work, a ZnS–CdS composite was studied, and special attention was dedicated to the influence of the preparation parameters on its H2 production activity. The ZnS–CdS composite, with an enhanced photoactivity for H2 production, was synthesized both from ammine complexes and, in a conventional way, directly from acetates at various pH values. Deviating from the traditional method, the photoactivity of ZnS–CdS prepared from ammine complexes was not affected by the pH. Besides, the hydrothermal treatment and the ammonia content strongly influenced the rate of H2 production in this system. DRS, TEM, SEM, XRD, and quantum yield measurements prove the dependence of the photoactivity of these catalysts on the structural and morphological properties determined by the preparation conditions. The promising photocatalytic efficiency achieved with the application of these ZnS–CdS catalysts, prepared without any metal deposition, encourages further investigations to enhance the rate of hydrogen generation by optimization of the reaction conditions for practical utilization.
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Almazroai LS, El-Mekawy RE. Synergetic effects of Cu/TiO 2 sensitized with different cyanine dyes on hydrogen evolution. RSC Adv 2019; 9:24670-24681. [PMID: 35528639 PMCID: PMC9069643 DOI: 10.1039/c9ra04696h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Accepted: 07/24/2019] [Indexed: 11/21/2022] Open
Abstract
The production of hydrogen as an alternative fuel is a major challenge for developed countries. To achieve this, photocatalysis is a promising method, which depends mainly on a renewable energy source, namely, the sun. Many derivatives of cyanine-sensitized Cu/TiO2 were prepared and characterized by XRD, SEM-EDS, TEM, BET surface area and UV-vis spectrophotometry and their photocatalytic activity was studied. The study of hydrogen production over the sensitized photocatalysts confirmed the significant role of the dyes in the enhancement of hydrogen production. Dye molecules harness light radiation to produce strong oxidizing species, such as hydroxyl radicals, which in turn form hydrogen molecules. Combining sonolysis with photocatalysis processes proved that ultrasound waves inhibit the agglomeration of particles and maintain their surface area. This synergetic process increased the efficiency of hydrogen production by 7 times using photocatalysis only.
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Affiliation(s)
- Layla S Almazroai
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University Makkah Saudi Arabia
| | - Rasha E El-Mekawy
- Department of Chemistry, Faculty of Applied Science, Umm Al-Qura University Makkah Saudi Arabia .,Department of Petrochemicals, Egyptian Petroleum Research Institute Nasr City Cairo Egypt
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Pansa-Ngat P, Jedsukontorn T, Hunsom M. Optimal Hydrogen Production Coupled with Pollutant Removal from Biodiesel Wastewater Using a Thermally Treated TiO₂ Photocatalyst (P25): Influence of the Operating Conditions. Nanomaterials (Basel) 2018; 8:nano8020096. [PMID: 29425142 PMCID: PMC5853727 DOI: 10.3390/nano8020096] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 02/01/2018] [Accepted: 02/06/2018] [Indexed: 11/16/2022]
Abstract
This work aimed to produce hydrogen (H₂) simultaneously with pollutant removal from biodiesel wastewater by photocatalytic oxidation using a thermally-treated commercial titanium dioxide (TiO₂) photocatalyst at room temperature (~30 °C) and ambient pressure. The effects of the operating conditions, including the catalyst loading level (1-6 g/L), UV light intensity (3.52-6.64 mW/cm²), initial pH of the wastewater (2.3-8.0) and reaction time (1-4 h), on the quantity of H₂ production together with the reduction in the chemical oxygen demand (COD), biological oxygen demand (BOD) and oil and grease levels were explored. It was found that all the investigated parameters affected the level of H₂ production and pollutant removal. The optimum operating condition for simultaneous H₂ production and pollutant removal was found at an initial wastewater pH of 6.0, a catalyst dosage of 4.0 g/L, a UV light intensity of 4.79 mW/cm² and a reaction time of 2 h. These conditions led to the production of 228 μmol H₂ with a light conversion efficiency of 6.78% and reduced the COD, BOD and oil and grease levels by 13.2%, 89.6% and 67.7%, respectively. The rate of pollutant removal followed a pseudo-first order chemical reaction with a rate constant of 0.008, 0.085 and 0.044 min-1 for the COD, BOD and oil and grease removal, respectively.
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Affiliation(s)
- Pimsuda Pansa-Ngat
- Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Trin Jedsukontorn
- Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Mali Hunsom
- Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
- Center of Excellence on Petrochemical and Materials Technology (PETRO-MAT), Chulalongkorn University, Bangkok 10330, Thailand.
- Associate Fellow of Royal Society of Thailand (AFRST), Bangkok 10300, Thailand.
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Lianos P. Production of electricity and hydrogen by photocatalytic degradation of organic wastes in a photoelectrochemical cell: the concept of the Photofuelcell: a review of a re-emerging research field. J Hazard Mater 2011; 185:575-590. [PMID: 21111532 DOI: 10.1016/j.jhazmat.2010.10.083] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 10/19/2010] [Accepted: 10/21/2010] [Indexed: 05/30/2023]
Abstract
The present review aims to give to a researcher who has no experience with Photofuelcells all necessary basic knowledge to join the field without much trouble and to give to an experienced researcher a handy manual of reference. The author has dealt with the principal matters related with the design of a photoelectrochemical cell and the factors that affect efficient production of electricity by photocatalytic degradation of (principally) organic and (secondarily) inorganic waste materials. A large portion of the paper is devoted to the review of materials used for making a photoanode since most of the accomplished research is on this exact matter. The paper also briefly reviews the materials used to make the rest of the components of the cell as well as the models of cell efficiency and photodegradation procedures during cell operation.
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Affiliation(s)
- Panagiotis Lianos
- Engineering Science Deptartment, University of Patras, 26500 Patras, Greece.
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Sasikala R, Shirole AR, Sudarsan V, Girija KG, Rao R, Sudakar C, Bharadwaj SR. Improved photocatalytic activity of indium doped cadmium sulfide dispersed on zirconia. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12531a] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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