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Comparative Study of the Effect of Doping ZnTiO 3 with Rare Earths (La and Ce) on the Adsorption and Photodegradation of Cyanide in Aqueous Systems. Int J Mol Sci 2023; 24:ijms24043780. [PMID: 36835191 PMCID: PMC9960395 DOI: 10.3390/ijms24043780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 02/03/2023] [Accepted: 02/05/2023] [Indexed: 02/16/2023] Open
Abstract
Cyanide is a highly toxic compound that can pose serious health problems to both humans and aquatic organisms. Therefore, the present comparative study focuses on the removal of total cyanide from aqueous solutions by photocatalytic adsorption and degradation methods using ZnTiO3 (ZTO), La/ZnTiO3 (La/ZTO), and Ce/ZnTiO3 (Ce/ZTO). The nanoparticles were synthesized by the sol-gel method and characterized by X-ray powder diffractometry (XRD), Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), Diffuse reflectance spectroscopy (DRS), and Specific surface area (SSA). The adsorption equilibrium data were fitted to the Langmuir and Freundlich isotherm models. Adsorption kinetics were also evaluated using the pseudo-first-order and pseudo-second-order models and the intraparticle diffusion model. Likewise, the photodegradation of cyanide under simulated sunlight was investigated and the reusability of the synthesized nanoparticles for cyanide removal in aqueous systems was determined. The results demonstrated the effectiveness of doping with lanthanum (La) and cerium (Ce) to improve the adsorbent and photocatalytic properties of ZTO. In general, La/ZTO showed the maximum percentage of total cyanide removal (99.0%) followed by Ce/ZTO (97.0%) and ZTO (93.6%). Finally, based on the evidence of this study, a mechanism for the removal of total cyanide from aqueous solutions using the synthesized nanoparticles was proposed.
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Jaramillo-Fierro X, González S, Medina F. La-Doped ZnTiO 3/TiO 2 Nanocomposite Supported on Ecuadorian Diatomaceous Earth as a Highly Efficient Photocatalyst Driven by Solar Light. Molecules 2021; 26:6232. [PMID: 34684814 PMCID: PMC8537966 DOI: 10.3390/molecules26206232] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/09/2021] [Accepted: 10/11/2021] [Indexed: 11/16/2022] Open
Abstract
Currently, there is great interest in the use of TiO2 for photocatalytic remediation of wastewater. Doping, heterojunction, and immobilization on porous materials are effective methods to improve the photocatalytic efficiency of this semiconductor oxide. In this study, ZnTiO3/TiO2 (ZTO) and ZnTiO3/TiO2/La (ZTO/La) nanocomposites were successfully prepared and immobilized on diatomaceous earth (DE). The composition and texture of the composites prepared were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM-EDX), and specific surface area (SSA). The adsorption capacity and photocatalytic activity of the composites were determined via degradation of methylene blue (MB) in batch reactors. The materials evaluated were prepared in the shape of 0.2 cm (diameter) and 1.0 cm (length) cylindrical extrudates. The results indicate that the ZTO/La-DE composite exhibited higher efficiency for the removal of MB under solar irradiation than both ZTO-DE and DE. The pseudo-second-order model and the Langmuir isotherm model were better suited to explain the adsorption process. The highest degradation percentage of MB obtained was 96% after 150 min of irradiation. The results indicate that synthesized composite could be used for the removal of cationic dyes in wastewater.
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Affiliation(s)
- Ximena Jaramillo-Fierro
- Departament d’Enginyería Química, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain;
- Departamento de Química y Ciencias Exactas, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador;
| | - Silvia González
- Departamento de Química y Ciencias Exactas, Universidad Técnica Particular de Loja, San Cayetano Alto, Loja 1101608, Ecuador;
| | - Francesc Medina
- Departament d’Enginyería Química, Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain;
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Ghubish Z, Kamal R, Mahmoud HR, Saif M, Hafez H, El-Kemary M. Novel fluorescent nano-sensor based on amino-functionalization of Eu 3+:SrSnO 3 for copper ion detection in food and real drink water samples. RSC Adv 2021; 11:18552-18564. [PMID: 35480928 PMCID: PMC9033474 DOI: 10.1039/d1ra01190a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 05/14/2021] [Indexed: 12/03/2022] Open
Abstract
Lanthanide-doped nanoparticles exhibit unique optical properties and have been widely utilized for different sensing applications. Herein, the Eu3+:SrSnO3@APTS nanosensor was synthesized and its optical properties were analyzed using UV-Vis and photoluminescence spectroscopy. The TEM images of the synthesized nanophosphor Eu3+:SrSnO3@APTS exhibited peanut-like morphology, composed of two or more spherical nanoparticles with an average diameter ∼33 nm. Effects of environmental pH values and doping concentrations as well as amino functionalization on the structure of Eu3+:SrSnO3 were investigated. The as-synthesized optical nanosensor was used for determination of copper ions based on a fluorescence quenching approach. Red emission with a long lifetime was obtained in the case of the 0.06 mol Eu3+:SrSnO3@APTS sample. Under the optimal experimental conditions, a Stern-Volmer plot exhibited a good linearity for copper ions over the concentration (0.00-10.8) × 10-11 mol L-1 with a correlation efficient of 0.996 and a limit of detection 3.4 × 10-12 mol L-1. The fluorescent sensor was dynamically quenched via a coulombic interaction mechanism between the Eu3+ (5L6) and Cu2+. The Eu3+:SrSnO3@APTS nanosensor with the optimal Eu3+ dopant concentration of 0.06 mol was applied for copper determination in food and real drink water samples with high recovery values. We believe that the developed nanosensor probe can also be used for the detection of other toxic compounds, with high selectivity and sensitivity.
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Affiliation(s)
- Z Ghubish
- Institute of Nanoscience & Nanotechnology, KafrelSheikh University Kafr ElSheikh 33516 Egypt
| | - R Kamal
- Department of Chemistry, Faculty of Education, Ain Shams University Roxy Cairo 11711 Egypt
| | - Hala R Mahmoud
- Department of Chemistry, Faculty of Education, Ain Shams University Roxy Cairo 11711 Egypt
| | - M Saif
- Department of Chemistry, Faculty of Education, Ain Shams University Roxy Cairo 11711 Egypt
| | - H Hafez
- Natural Resources Department, Environmental Studies and Research Institute, University of Sadat City Egypt
| | - M El-Kemary
- Institute of Nanoscience & Nanotechnology, KafrelSheikh University Kafr ElSheikh 33516 Egypt
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Jiang L, Chen W, Zheng J, Zhu L, Mo L, Li Z, Hu L, Hayat T, Alsaedi A, Zhang C, Dai S. Enhancing the Photovoltaic Performance of Perovskite Solar Cells with a Down-Conversion Eu-Complex. ACS APPLIED MATERIALS & INTERFACES 2017; 9:26958-26964. [PMID: 28753267 DOI: 10.1021/acsami.7b10101] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Organometal halide perovskite solar cells (PSCs) have shown high photovoltaic performance but poor utilization of ultraviolet (UV) irradiation. Lanthanide complexes have a wide absorption range in the UV region and they can down-convert the absorbed UV light into visible light, which provides a possibility for PSCs to utilize UV light for higher photocurrent, efficiency, and stability. In this study, we use a transparent luminescent down-converting layer (LDL) of Eu-4,7-diphenyl-1,10-phenanthroline (Eu-complex) to improve the light utilization efficiency of PSCs. Compared with the uncoated PSC, the PSC coated with Eu-complex LDL on the reverse of the fluorine-doped tin oxide glass displayed an enhancement of 11.8% in short-circuit current density (Jsc) and 15.3% in efficiency due to the Eu-complex LDL re-emitting UV light (300-380 nm) in the visible range. It is indicated that the Eu-complex LDL plays the role of enhancing the power conversion efficiency as well as reducing UV degradation for PSCs.
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Affiliation(s)
- Ling Jiang
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
- University of Science and Technology of China , Hefei, 230026, P. R. China
| | - Wangchao Chen
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
- University of Science and Technology of China , Hefei, 230026, P. R. China
| | - Jiawei Zheng
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
- University of Science and Technology of China , Hefei, 230026, P. R. China
| | - Liangzheng Zhu
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
- University of Science and Technology of China , Hefei, 230026, P. R. China
| | - Li'e Mo
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
| | - Zhaoqian Li
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
| | - Linhua Hu
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
| | - Tasawar Hayat
- NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia
| | - Ahmed Alsaedi
- NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia
| | - Changneng Zhang
- Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, Anhui 230088, P. R. China
| | - Songyuan Dai
- Beijing Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University , Beijing, 102206, P. R. China
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Li Y, Guo W, Hao H, Wang L, Su Q, Jin S, Qin L, Gao W, Liu G, Hu Z. Enhancing photoelectrical performance of dye–sensitized solar cell by doping SrTiO 3 :Sm 3+ @SiO 2 core–shell nanoparticles in the photoanode. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.05.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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