Optical MaterialsPub Date : 2024-11-18DOI: 10.1016/j.optmat.2024.116443
Tran Ngoc , Nguyen Xuan Ca , Nguyen Viet Ha , Tran Thi Chung Thuy , Nguyen Thi Huong , Luong Duy Thanh , Nguyen Van Nghia , Phan Van Do
{"title":"Thermoluminescence properties of the Li2B4O7:Dy3+,Ce3+ glasses and their application potential in the dosimetry field","authors":"Tran Ngoc , Nguyen Xuan Ca , Nguyen Viet Ha , Tran Thi Chung Thuy , Nguyen Thi Huong , Luong Duy Thanh , Nguyen Van Nghia , Phan Van Do","doi":"10.1016/j.optmat.2024.116443","DOIUrl":"10.1016/j.optmat.2024.116443","url":null,"abstract":"<div><div>In this study, we have successfully fabricated the lithium-borate glasses co-doped with Ce<sup>3+</sup> and Dy<sup>3+</sup> ions (Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>:Ce<sup>3+</sup>,Dy<sup>3+</sup> or LBO: Ce<sup>3+</sup>,Dy<sup>3+</sup>) using the melt quenching technique. Our main purpose is to study the thermoluminescence (TL) characteristics and application potential of the material in the dosimetry area. The TL properties of the Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>:Ce<sup>3+</sup>,Dy<sup>3+</sup> glasses were studied through the glow curve and TL spectra. The thermoluminescence mechanism for these glasses has been proposed. The optimal conditions for studying of the TL process have been found for the Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>:Ce<sup>3+</sup>,Dy<sup>3+</sup> glasses. The kinetic parameters of the main peak (225 °C), for example, the activation energy, lifetime, and frequency factor of the electronic trapping centers were analyzed using the peak shape method. The important factors to estimate the application potential of the material, such as the relative sensitivity, linear responses, dose detection threshold, mean standard deviation, fading rate, reproducibility, and intrinsic precision have been studied in detail. The obtained results showed that the Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>:Ce<sup>3+</sup>,Dy<sup>3+</sup> glasses have a high potential for dosimetry applications in medical and food irradiation.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116443"},"PeriodicalIF":3.8,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-17DOI: 10.1016/j.optmat.2024.116419
K.S. Usha , Sang Yeol Lee , R. Sivakumar , C. Sanjeeviraja
{"title":"Effect of thermal treatment on thin films of NiO:WO3 for optoelectronic applications","authors":"K.S. Usha , Sang Yeol Lee , R. Sivakumar , C. Sanjeeviraja","doi":"10.1016/j.optmat.2024.116419","DOIUrl":"10.1016/j.optmat.2024.116419","url":null,"abstract":"<div><div>Nickel oxide (NiO), a semiconducting metal oxide, with its exceptional optical, electrical, and magnetic properties make it highly sought after for use in optical, optoelectronic, and electrochromic devices. Recent advancements in NiO-optical devices relies on the optical parameters like intrinsic optical nonlinearities. The current study involves the deposition of NiO:WO<sub>3</sub> thin films utilizing radio frequency (RF) sputtering at various substrate temperature (T<sub>s</sub>) of 100, 200, and 300 °C. An investigation was carried out to analyse the significance of T<sub>s</sub> on the structural, optical, morphological, & vibrational characteristics. The X-ray diffraction investigation revealed the amorphous nature of the films. Scanning electron microscopy confirms the compact pinhole free surface of the films. The results of energy dispersive X-ray spectroscopy (EDS) spectra verified the existence of nickel (Ni), oxygen (O), and tungsten (W) components in the films. XPS analysis confirms the presence of both Ni<sup>2+</sup> and Ni<sup>3+</sup> states. The optical transmittance increased, and the band gap decreased with increase in T<sub>s</sub>. The impact of T<sub>s</sub> on various optical parameters such as refractive index, extinction co-efficient, dielectric constants, optical non-linear susceptibility, and dispersion energy parameters obtained by the Wemple-DiDomenico theory has been calculated and extensively investigated. The results indicate that NiO:WO<sub>3</sub> films can be used to fabricate electrochromic and optoelectronic devices.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116419"},"PeriodicalIF":3.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-17DOI: 10.1016/j.optmat.2024.116411
Mahmoud M. Ismail , Ebrahim A. Mahdy , H.A. Abo-Mosallam
{"title":"Spectroscopic properties of Ce3+ doped silicate glasses for near-UV white LEDs and blue laser applications","authors":"Mahmoud M. Ismail , Ebrahim A. Mahdy , H.A. Abo-Mosallam","doi":"10.1016/j.optmat.2024.116411","DOIUrl":"10.1016/j.optmat.2024.116411","url":null,"abstract":"<div><div>Using the traditional melt quenching method, a blue-emitting glass Ce<sup>3+</sup>-(Cao-MgO-SiO<sub>2</sub>) was developed to be used in White light emitting diodes (W-LEDs). The FTIR and X-ray diffraction were employed to check the structure of the prepared samples. The results indicated that all of the samples were in the amorphous phase, and the tetrahedron SiO<sub>2</sub> is the basic building block in the glass network. The photoluminescence (PL), photoluminescence excitation (PLE), and time-resolved photoluminescence (TRPL) techniques were used to investigate the optical and spectroscopic properties of the synthesized glass. The outcomes revealed that a UV chip can efficiently stimulate the phosphor, causing it to release a powerful, broad blue spectrum with a maximum wavelength at 405 nm, Furthermore, our samples' average lifetimes are two orders of magnitude longer than those of comparable glasses, indicating that the 5d level turned to a meta-stable level. The sample with the optimum Ce<sup>3+</sup> content (S0.5Ce) displayed a bright blue emission with chromaticity coordinates of (0.186, 0.096) and color purity of 89.36 %. Based on the current research, Ce<sup>3+</sup>-(Cao-MgO-SiO<sub>2</sub>) glass appears to be a viable candidate for near-UV chip-based W-LEDs applications.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116411"},"PeriodicalIF":3.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-17DOI: 10.1016/j.optmat.2024.116431
Zhenhao Zhang , Yi Wang , Yanqiu Huang , Mustapha Karkri , Mahamadou Abdou Tankari , Laurent Ibos
{"title":"Experimental study on optical properties of various paraffin-based PCM glazing unit and radiative transfer model optimization","authors":"Zhenhao Zhang , Yi Wang , Yanqiu Huang , Mustapha Karkri , Mahamadou Abdou Tankari , Laurent Ibos","doi":"10.1016/j.optmat.2024.116431","DOIUrl":"10.1016/j.optmat.2024.116431","url":null,"abstract":"<div><div>Integrating phase change material (PCM) into glazing units can lead to the ability of dynamic response to solar radiation and enhance thermal mass. In order to clarify the optical performance of phase change material glazing unit (PCMGU) during the dynamic response stage, this study analyzes the variations of transmittance and reflectance of PCMGUs filled with different paraffins during phase change process, by using a spectrophotometer and a temperature measurement device. Additionally, the impact of the paraffin cooling rate on this process was also examined. The experimental results indicate that: (1) During the solid-liquid phase change process, the curve of PCMGU transmittance and reflectance versus paraffin temperature exhibits a significant linear characteristic, with 75–93 % of transmittance and reflectance changes appearing during this stage; (2) Adjusting the paraffin cooling rate does not alter this linear characteristic; (3) Approximately 19 % and 36 % of PCMGU transmittance and reflectance changes occur during the solid-solid phase change process, respectively. Finally, based on the experimental patterns, the radiative transfer model for PCMGU was optimized, reducing its calculation error to a range of 0.17–0.92 times that of previous models (in terms of root mean square error).</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116431"},"PeriodicalIF":3.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-14DOI: 10.1016/j.optmat.2024.116428
Wang Fang, Heng-Jie Chen, Jia-Wei Zhang
{"title":"Theoretical studies of optical spectra and spin-Hamiltonian parameters for Co2+ in Cs3CoCl5 with first-principles calculations and ligand field theory","authors":"Wang Fang, Heng-Jie Chen, Jia-Wei Zhang","doi":"10.1016/j.optmat.2024.116428","DOIUrl":"10.1016/j.optmat.2024.116428","url":null,"abstract":"<div><div>Unified calculations of whole energy levels, zero-field splitting (ZFS) parameter <em>D</em> and spin resonance <em>g</em> factor of the ground state for Co<sup>2+</sup> in Cs<sub>3</sub>CoCl<sub>5</sub> have been carried out by a combined method of the first-principles calculations and ligand field theory (LFT). In the calculations, no adjustable parameter is used and all the parameters needed in the LFT calculation are determined by first-principles calculations. The configuration interaction through Coulomb interaction, low-symmetry ligand field, and spin-orbital coupling (SOC) interaction are taken into account. The calculated results are in good agreement with the experimental observations overall. It demonstrates that the combined method of first-principles calculations with LFT can not only reproduce experimental results but also predict the fine energy structure of multiplet splittings.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116428"},"PeriodicalIF":3.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-14DOI: 10.1016/j.optmat.2024.116407
Xinglin Li , Pengfei Zhu , Dandan Chen , Zhaoxin Huang , Han Lu
{"title":"Performance and mechanism of Bi2WO6/AgI/ZnFe2O4 double Z-scheme heterojunction photocatalyst for tetracycline hydrochloride degradation under visible light","authors":"Xinglin Li , Pengfei Zhu , Dandan Chen , Zhaoxin Huang , Han Lu","doi":"10.1016/j.optmat.2024.116407","DOIUrl":"10.1016/j.optmat.2024.116407","url":null,"abstract":"<div><div>Recent studies on the effective degradation of antibiotics in water bodies have attracted extensive attention in wastewater treatment. In this paper, a novel AgI/Bi<sub>2</sub>WO<sub>6</sub>/ZnFe<sub>2</sub>O<sub>4</sub> catalyst has been synthesized with double Z-scheme heterojunction by ultrasonic assisted coprecipitation-mechanical mixing, and the degradation properties of tetracyclin hydrochloride (TC-HCl) have been studied. It was found that the degradation rate of TC-HCl by the AgI/Bi<sub>2</sub>WO<sub>6</sub>/ZnFe<sub>2</sub>O<sub>4</sub> catalyst could reach 92.22 % within 90 min under visible light, and its pseudo-first-order reaction rate constant is 0.02016 min<sup>−1</sup>, which is 3.17, 1.52, 2.23 and 1.09 times higher than AgI, Bi<sub>2</sub>WO<sub>6</sub>, ZnFe<sub>2</sub>O<sub>4</sub>, AgI/Bi<sub>2</sub>WO<sub>6</sub> respectively. Meanwhile, the catalyst likewise exhibited good salt resistance, wide applicability and water adaptability to antibiotics. Through a series of characterization experiments, it is observed that the principal reason for the advancement of photocatalytic activity of AgI/Bi<sub>2</sub>WO<sub>6</sub>/ZnFe<sub>2</sub>O<sub>4</sub> may lie in that the combination of AgI and ZnFe<sub>2</sub>O<sub>4</sub> on Bi<sub>2</sub>WO<sub>6</sub> enhances the visible light absorption capacity and adsorption performance of the catalyst, and forms a heterojunction with it to accelerate the separation of photogenerated carriers. In conclusion, this experiment has put forth a mechanism involving a dual Z-scheme heterojunction for electron transfer, which accounts for the photocatalytic degradation of TC-HCl under visible light illumination using the AgI/Bi<sub>2</sub>WO<sub>6</sub>/ZnFe<sub>2</sub>O<sub>4</sub> composite material.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116407"},"PeriodicalIF":3.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-12DOI: 10.1016/j.optmat.2024.116421
Rita Butkute , Tomas Serevicius , Steponas Raisys , Kamile Tulaite , Levani Skhirtladze , Gjergji Sini , Juozas Vidas Grazulevicius , Saulius Jursenas
{"title":"Triplet harvesting in trifluoromethyl quinoxaline derivatives via TADF and RTP mechanisms","authors":"Rita Butkute , Tomas Serevicius , Steponas Raisys , Kamile Tulaite , Levani Skhirtladze , Gjergji Sini , Juozas Vidas Grazulevicius , Saulius Jursenas","doi":"10.1016/j.optmat.2024.116421","DOIUrl":"10.1016/j.optmat.2024.116421","url":null,"abstract":"<div><div>In this study, we explore the impact of donor strength on the photophysical properties of novel trifluoromethyl quinoxaline derivatives, which incorporate various electron-donating moieties exhibiting distinct conformational characteristics. The triplet harvesting mechanisms within these quinoxaline systems are facilitated through thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP), both of which can be modulated by subtle structural alterations in the donor unit. The derivatives demonstrate varying photophysical properties, including pure RTP activity, dual activity (exhibiting both TADF and RTP), and pure TADF, contingent upon the nature of the electron-donating moieties employed. Notably, the intersystem crossing (ISC) rates are significantly higher than the rates of radiative decay, leading to diminished fluorescence quantum yields (Φ<sub>DF</sub>) of the compounds in toluene solutions. However, embedding the TADF compounds within a rigid polystyrene (PS) matrix results in a remarkable enhancement of Φ<sub>DF</sub> due to significant reduction of nonradiative pathways related to intramolecular twisting. A considerable conformational disorder of the polymer doped films was observed resulting in non-exponential fluorescence decay and significant shifts of prompt and delayed fluorescence in time-resolved spectra.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"158 ","pages":"Article 116421"},"PeriodicalIF":3.8,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142724029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-01DOI: 10.1016/j.optmat.2024.116394
Mohd Raish , Sultan , Mohammad Jane Alam , Musheer Ahmad , S.M. Afzal , Shabbir Ahmad
{"title":"Experimental and theoretical studies of a new NLO active organic salt of 2-amino-4-hydroxy-6-methylpyrimidine and 4-hydroxybenzoic acid","authors":"Mohd Raish , Sultan , Mohammad Jane Alam , Musheer Ahmad , S.M. Afzal , Shabbir Ahmad","doi":"10.1016/j.optmat.2024.116394","DOIUrl":"10.1016/j.optmat.2024.116394","url":null,"abstract":"<div><div>The new monohydrate organic salt (AHMPHB) of 2-amino-4-hydroxy-6-methylpyrimidine (AHMP) with 4-hydroxybenzoic acid (HBA) was successfully synthesized and grown as an organic single crystal with characteristic optical quality using the slow evaporation technique (SET). The structural study of the grown crystal was performed using single-crystal XRD. The XRD results revealed that AHMPHB belongs to the triclinic system with space group P-1. Various functional groups of AHMPHB were identified using Raman and FTIR spectroscopic analyses. The optimized geometry and other theoretical results were determined by the DFT/B3LYP method at the 6–311++G(d,p) basis set. The H⋅⋅⋅H and O⋅⋅⋅H intermolecular forces are dominated in the crystal packing and these were explored using Hirshfeld surface and fingerprint plot analyses. TG and DTA studies demonstrate that AHMPHB remains stable up to 140 °C. According to UV–Vis spectral analysis, AHMPHB has exhibited high transparency in the visible region with a direct band gap of 4.10 eV. The NLO measurement of AHMPHB was done using the Z-scan method. The energy of the HOMO-LUMO gap of 4.37 eV was predicted using DFT calculations. NBO analysis was performed to represent the charge transfer between localized bonds and lone pairs. Moreover, the MEP maps, HOMO-LUMO profiles and theoretical NLO parameters of AHMPHB and its constituents are also obtained.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116394"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Surface enhanced Raman scattering-based sensing and ultrafast nonlinear optical properties of silver-hexagonal boron nitride nanocomposites achieved by femtosecond laser ablation","authors":"Kousik Bera , Sree Satya Bharati Moram , Dipanjan Banerjee , Jayeeta Lahiri , Venugopal Rao Soma","doi":"10.1016/j.optmat.2024.116393","DOIUrl":"10.1016/j.optmat.2024.116393","url":null,"abstract":"<div><div>This study investigated the surface-enhanced Raman spectroscopy (SERS) properties and nonlinear optical (NLO) behavior of silver nanoparticles (Ag NPs) decorated hexagonal boron nitride (hBN) nanocomposites. Although Ag NPs are known for their excellent plasmonic properties, their susceptibility to oxidation in ambient conditions significantly reduces SERS activity. To overcome this, a femtosecond laser-assisted single-step novel approach is developed for synthesizing hybrid Ag-hBN nanocomposites via ablating Ag target in a solution of exfoliated hBN nanosheets, forming uniformly embedded Ag NPs on hBN nanosheets. The morphological characteristics and elemental compositions were validated by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). TEM analysis revealed that Ag NPs averaged 15 nm in size, while hBN nanosheets had lateral dimensions of approximately 250 nm. The SERS activity of the prepared nanocomposites was investigated using dye and explosive molecules, achieving detection sensitivities of 1 μM and 100 μM, respectively, with high reproducibility. These detection sensitivities are significant as they demonstrate the potential of the Ag-hBN nanocomposites for sensitive and reliable detection of trace amounts of analytes. Notably, the Ag-hBN nanocomposites showed enhanced SERS activity compared to pure Ag NPs, with a 2.5-fold improvement for Nile blue, 3.6-fold for methylene blue, and 2.4-fold for RDX. The current study also demonstrates that hBN prevents Ag NPs’ oxidation and preserves the SERS functionality even at elevated temperatures. Furthermore, the NLO properties of the nanocomposites were investigated using the standard Z-scan technique, revealing two-photon and three-photon absorption coefficients of 3 × 10<sup>−4</sup> cm/GW and 6.5 × 10<sup>−5</sup> cm<sup>3</sup>/GW<sup>2</sup>, respectively. The findings highlight the potential of Ag-hBN nanocomposites to enhance SERS and NLO devices, enabling future applications in sensing and photonics.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116393"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical MaterialsPub Date : 2024-11-01DOI: 10.1016/j.optmat.2024.116408
Ali Sayqal , Alia A. Alfi , Nada M. Alatawi , S.A. Al-Ghamdi , Ibrahim S.S. Alatawi , Abdulrhman M. Alsharari , Hussain Alessa , Nashwa M. El-Metwaly
{"title":"Breakdown cost and recycling processes of Bentonite/TiO2 quantum dots of photo and solar degradation of Congo Red dye and industrial dyes wastes","authors":"Ali Sayqal , Alia A. Alfi , Nada M. Alatawi , S.A. Al-Ghamdi , Ibrahim S.S. Alatawi , Abdulrhman M. Alsharari , Hussain Alessa , Nashwa M. El-Metwaly","doi":"10.1016/j.optmat.2024.116408","DOIUrl":"10.1016/j.optmat.2024.116408","url":null,"abstract":"<div><div>This research presents the preparation, characterization, and application of a novel bentonite- TiO<sub>2</sub> quantum dot (Bent/TQ) nanocomposite for the efficient photodegradation of Congo Red dye, a common pollutant in industrial wastewater. The composite was prepared via a co-precipitation method followed by calcination, which facilitated the uniform dispersion of TiO<sub>2</sub> quantum dots within the bentonite matrix. The resulting material exhibited a high specific surface area of 205.45 m<sup>2</sup>/g and an optimized band gap of 3.15 eV, making it suitable for visible light photocatalysis. The photocatalytic efficiency of Bent/TQ was evaluated under both xenon lamp irradiation and natural sunlight. The composite demonstrated a significant degradation rate constant of 23.35 × 10⁻³ s⁻<sup>1</sup>, which is comparable to that of pure TiO<sub>2</sub> quantum dots (28.86 × 10⁻³ s⁻<sup>1</sup>). Mechanistic studies revealed that the primary active species responsible for the degradation were hydroxyl radicals (•OH), generated through the interaction of photogenerated electron-hole pairs with H<sub>2</sub>O molecules and molecular oxygen. Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) analyses were employed to assess the mineralization efficiency of the composite. The Bent/TQ catalyst achieved a COD removal efficiency of 84.5 % and a TOC reduction of 76.2 % after 240 min of irradiation under natural sunlight. Reusability tests indicated that the photocatalyst retained approximately 80 % of its original efficiency after seven consecutive cycles, though a slight decline was observed due to particle agglomeration under prolonged light exposure. The economic analysis suggested that the use of Bent/TQ nanocomposites could reduce operational costs by 29.12 % compared to conventional TiO<sub>2</sub>-based systems, making it a cost-effective solution for large-scale wastewater treatment. This work highlights the potential of Bent/TQ nanocomposites as sustainable and efficient photocatalysts for environmental remediation, with future efforts aimed at enhancing their long-term stability and expanding their applicability to a broader range of pollutants.</div></div>","PeriodicalId":19564,"journal":{"name":"Optical Materials","volume":"157 ","pages":"Article 116408"},"PeriodicalIF":3.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}