1
|
Barrera-Andrade JM, Luna-Santiago JA, Albiter E, Rojas-García E, Merlano AS, Salazar Á, Salmones J, Valenzuela MA. In situ formation of Cu xO/ZnO photocatalysts for efficient simultaneous oxidation of As (III) and adsorption of As (V): Effect of Cu loading. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:3745-3753. [PMID: 38091221 DOI: 10.1007/s11356-023-31480-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 12/06/2023] [Indexed: 01/19/2024]
Abstract
The introduction of Cu ions onto ZnO leads to alterations in the electrical, optical, and magnetic characteristics of ZnO. These transformations, in turn, result in heightened photocatalytic activity and enhanced stability when employed in the degradation of both organic and inorganic pollutants. Here, a novel photocatalytic-adsorbent system is developed using zinc oxide (ZnO) nanostructures modified with Cu (II) ions in an aqueous solution containing 40 mg/L of As (III). The system utilizes UV-A light (365 nm) as the irradiation source, and the weight percentage of Cu (II) in the composite varies from 0 to 20%. The experimental results reveal significant adsorption of As (III), ranging from 20 to 50%, depending on the solution's Cu (II) content. Remarkably, the ZnO10%Cu composite exhibits the highest photocatalytic activity, achieving 40% adsorption and complete oxidation of As (III) within 25 min of irradiation. Characterization of the composite after the photocatalytic treatment reveals the effective adsorption of As (V) within its structure. Furthermore, no traces of Cu (II) ions are detected in the solution after the reaction, indicating their successful adsorption onto the ZnO surface as Cu (I) and Cu (II) ions. This research marks a significant advancement in harnessing innovative materials for efficient arsenic removal, offering promising insights into the development of novel photocatalytic-adsorbent systems.
Collapse
Affiliation(s)
- José Manuel Barrera-Andrade
- Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, CDMX, México.
| | - José A Luna-Santiago
- Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, CDMX, México
| | - Elim Albiter
- Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, CDMX, México
| | - Elizabeth Rojas-García
- Área de Ingeniería Química, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, 09340, CDMX, México
| | - Aura S Merlano
- Grupo de Óptica y Espectroscopía (GOE), Centro de Ciencia Básica, Universidad Pontificia Bolivariana, 050031, Medellín, Colombia
| | - Ángel Salazar
- Grupo de Óptica y Espectroscopía (GOE), Centro de Ciencia Básica, Universidad Pontificia Bolivariana, 050031, Medellín, Colombia
| | - José Salmones
- Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, CDMX, México
| | - Miguel A Valenzuela
- Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, CDMX, México
| |
Collapse
|
2
|
He Z, Wei Q, Liang C, Liu D, Ma J, Chen X, Song M. Unraveling the capture mechanism of gaseous As 2O 3 over H-zsm-5 zeolite from coal-fired flue gas: Experimental and theoretical insights. CHEMOSPHERE 2023:139243. [PMID: 37330063 DOI: 10.1016/j.chemosphere.2023.139243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 05/17/2023] [Accepted: 06/14/2023] [Indexed: 06/19/2023]
Abstract
Gaseous As2O3 discharged from coal-fired power plants results in severe detriments to the ecological environment. It is of great urgency to develop highly efficient As2O3 capture technology for reducing atmospheric arsenic contamination. Utilizing solid sorbents for gaseous As2O3 capture is a promising treatment for As2O3 capture. The zeolite of H-ZSM-5 was applied for As2O3 capture at high temperatures of 500-900 °C. Special attention was paid to clarifying its capture mechanism and identifying the influence of flue gas components via density functional theory (DFT) calculations and ab initio molecular dynamics (AIMD) simulations. Results revealed that due to high thermal stability with large specific areas, H-ZSM-5 demonstrated excellent arsenic capture at 500-900 °C. The captured arsenic consisted of As3+ and As5+ speciations, ascribed to As2O3 adsorption and oxidation. Moreover, As3+ and As5+ compounds were both through physisorption or chemisorption at 500-600 °C while dominant chemisorption at 700-900 °C. In particular, As3+ compounds were much more steadily fixed in products at all operating temperatures. Combining the characterization analysis and DFT calculations, it further verified that both Si-OH-Al groups and external Al species of H-ZSM-5 could chemisorb As2O3, and the latter exhibited much stronger affinities via orbital hybridization and electron transfer. The introduced O2 could facilitate As2O3 oxidation and fixation in H-ZSM-5, especially at a lower concentration of 2%. Additionally, H-ZSM-5 possessed great acid gas resistance for As2O3 capture under the concentration of NO or SO2 less than 500 ppm. AIMD simulations further identified that compared to NO and SO2, As2O3 was far more competitive and occupied the active sites of the Si-OH-Al groups and external Al species of H-ZSM-5. Overall, it demonstrated that H-ZSM-5 is a promising sorbent for As2O3 capture from coal-fired flue gas.
Collapse
Affiliation(s)
- Zhongli He
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China.
| | - Qi Wei
- High Performance Computing Department, National Supercomputing Center in Shenzhen, Shenzhen, 518000, China
| | - Cai Liang
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China.
| | - Daoyin Liu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Jiliang Ma
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Xiaoping Chen
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| | - Min Song
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
| |
Collapse
|
3
|
ALSamman MT, Sotelo S, Sánchez J, Rivas BL. Arsenic oxidation and its subsequent removal from water: An overview. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.123055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
4
|
Bullen JC, Heiba HF, Kafizas A, Weiss DJ. Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO 2 /Fe 2 O 3. Chemistry 2022; 28:e202104181. [PMID: 35114042 PMCID: PMC9306794 DOI: 10.1002/chem.202104181] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Indexed: 11/08/2022]
Abstract
Composite photocatalyst‐adsorbents such as TiO2/Fe2O3 are promising materials for the one‐step treatment of arsenite contaminated water. However, no previous study has investigated how coupling TiO2 with Fe2O3 influences the photocatalytic oxidation of arsenic(III). Herein, we develop new hybrid experiment/modelling approaches to study light absorption, charge carrier behaviour and changes in the rate law of the TiO2/Fe2O3 system, using UV‐Vis spectroscopy, transient absorption spectroscopy (TAS), and kinetic analysis. Whilst coupling TiO2 with Fe2O3 improves total arsenic removal by adsorption, oxidation rates significantly decrease (up to a factor of 60), primarily due to the parasitic absorption of light by Fe2O3 (88 % of photons at 368 nm) and secondly due to changes in the rate law from disguised zero‐order kinetics to first‐order kinetics. Charge transfer across this TiO2‐Fe2O3 heterojunction is not observed. Our study demonstrates the first application of a multi‐adsorbate surface complexation model (SCM) towards describing As(III) oxidation kinetics which, unlike Langmuir‐Hinshelwood kinetics, includes the competitive adsorption of As(V). We further highlight the importance of parasitic light absorption and catalyst fouling when designing heterogeneous photocatalysts for As(III) remediation.
Collapse
Affiliation(s)
- Jay C Bullen
- Department of Earth Science and Engineering, Faculty of Engineering Imperial College London, London, SW7 2BX, UK.,Department of Chemistry, White City Campus Imperial College London, London, W12 OBZ, UK.,London Centre for Nanotechnology, London, SW7 2AZ, UK
| | - Hany F Heiba
- Department of Earth Science and Engineering, Faculty of Engineering Imperial College London, London, SW7 2BX, UK.,Department of Chemistry, White City Campus Imperial College London, London, W12 OBZ, UK.,London Centre for Nanotechnology, London, SW7 2AZ, UK.,Marine Chemistry Department, Environmental Division National Institute of Oceanography and Fisheries, NIOF), Egypt
| | - Andreas Kafizas
- Department of Chemistry, White City Campus Imperial College London, London, W12 OBZ, UK.,The Grantham Institute, Faculty of Natural Sciences Imperial College London, London, SW7 2AZ, UK
| | - Dominik J Weiss
- Department of Earth Science and Engineering, Faculty of Engineering Imperial College London, London, SW7 2BX, UK.,Civil and Environmental Engineering, E-Quad, Princeton University, Princeton, USA
| |
Collapse
|
5
|
Bullen JC, Dworsky LN, Eikelboom M, Carriere M, Alvarez A, Salaün P. Low-cost electrochemical detection of arsenic in the groundwater of Guanajuato state, central Mexico using an open-source potentiostat. PLoS One 2022; 17:e0262124. [PMID: 35045132 PMCID: PMC8769315 DOI: 10.1371/journal.pone.0262124] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 12/18/2021] [Indexed: 12/13/2022] Open
Abstract
Arsenic is a carcinogenic groundwater contaminant that is toxic even at the parts-per-billion (ppb) level and its on-site determination remains challenging. Colorimetric test strips, though cheap and widely used, often fail to give reliable quantitative data. On the other hand, electrochemical detection is sensitive and accurate but considerably more expensive at the onset. Here, we present a study on arsenic detection in groundwater using a low-cost, open-source potentiostat based on Arduino technology. We tested different types of gold electrodes (screen-printed and microwire) with anodic stripping voltammetry (ASV), achieving low detection limits (0.7 μg L-1). In a study of arsenic contaminated groundwaters in Mexico, the microwire technique provides greater accuracy than test strips (reducing the median error from -50% to +2.9%) and greater precision (reducing uncertainties from ±25% to ±4.9%). Most importantly, the rate of false negatives versus the World Health Organisation’s 10 μg L-1 limit was reduced from 50% to 0% (N = 13 samples). Arsenic determination using open-source potentiostats may offer a low-cost option for research groups and NGOs wishing to perform arsenic analysis in-house, yielding superior quantitative data than the more widely used colorimetric test strips.
Collapse
Affiliation(s)
- Jay C. Bullen
- Department of Earth Science and Engineering, Faculty of Engineering, Imperial College London, London, United Kingdom
- * E-mail: (JCB); (PS)
| | | | - Martijn Eikelboom
- Caminos de Agua, San Miguel de Allende, Guanajuato, Mexico
- Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
| | | | | | - Pascal Salaün
- Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
- * E-mail: (JCB); (PS)
| |
Collapse
|