Article
Environmental Sciences
Bablu Basumatary, Rajmoni Basumatary, Anjalu Ramchiary, Dimpul Konwar
Summary: Methylene blue degradation in wastewater was achieved effectively through the photocatalytic activity of Ag@TiO2/WO3 nanocomposite, which was prepared by a modified sol-gel precipitation route. The enhanced photocatalytic performance was attributed to reduced bandgap, improved charge carrier transfer efficiency, and plasmonic sensitization of Ag, resulting in a 25 times higher degradation rate compared to commercial DP25 photocatalyst under visible light.
Article
Environmental Sciences
Mahalakshmi Krishnasamy, Ranjith Rajendran, Shanmugam Vignesh, Priyadharsan Arumugam, Barathi Diravidamani, Mohd Shkir, Hamed Algarni
Summary: Among different types of semiconductor photocatalysts, MoS2 hybridized with graphitic carbon heterojunction has shown great potential due to its static chemical properties, suitable band structure, and easy synthesis. The study revealed the physiochemical and surface characterizations of the hybridized heterojunction nanocomposite, with diffused reflectance spectroscopy showing the tailored energy band gap. The efficient electron/hole pair separation, increase in redox species, and utilization of solar range led to greater degradation efficacy of g-C3N4/MoS2 heterojunction.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Mintong Ma, Yanming Lin, V. Maheskumar, Peiying Li, Jiayi Li, Zhengkun Wang, Minjie Zhang, Zhenyi Jiang, Ruiqin Zhang
Summary: This study successfully synthesized Mo, N (co) doped ZnIn2S4/g-C3N4 nanosheets using a sol-gel method. The research showed that the heterostructure construction and codoping extended the optical absorption edge and provided more active sites, resulting in improved separation and transfer of photoinduced electron-hole pairs. The optimized (0.35% Mo, 2.4 % N) codoped ZnIn2S4/g-C3N4 Z-scheme photocatalyst exhibited outstanding photocatalytic activity and cyclic stability, with a degradation rate of 97% for methylene blue after 120 min irradiation.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Condensed Matter
Dilip K. L. Harijan, Sakshi Gupta, Sachin Kumar Ben, Amit Srivastava, Jai Singh, Vimlesh Chandra
Summary: The report demonstrates the photocatalytic degradation of methylene blue dye under solar energy using alpha-Fe2O3-ZnO composite, synthesized by a simple chemical method. The composite shows superior degradation capacity compared to bare hematite and zinc oxide nanoparticles, with the 1:2 composite exhibiting the best performance. UV light plays a crucial role in the catalytic degradation of methylene blue, while visible light has no effect.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Shiyue Hu, Junhong Liu, Xuanlan Luo, Qiqi Shen, Yu Qin, Haikun Hu, Jinhai Yuan, Shuangkou Chen, Di Xu
Summary: Currently, photocatalytic degradation is a fascinating technology that can effectively treat environmental problems by degrading chemicals from wastewater. In this study, a composite photocatalyst of hexagonal prism GQDs/h-MoO3 was synthesized and its properties were investigated. The optimized preparation conditions and the photocatalytic activity of the composite were determined by studying the photodegradation of Methylene Blue. The results showed that 10GQDs/h-MoO3 exhibited the best photocatalytic performance with a high photodegradation efficiency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Environmental
Periyakaruppan Karuppasamy, Nagoorkani Ramzan Nilofar Nisha, Arivalagan Pugazhendhi, Sabariswaran Kandasamy, Sakthivel Pitchaimuthu
Summary: The study focused on preparing semiconducting materials like TiO2 and transition metal-doped TiO2 using a sol-gel method and characterizing them through various analyses. Among them, Zn-doped TiO2 showed the best photocatalytic efficiency in decolouring Methylene blue dye under visible light irradiation. Results indicated that Zn-doped TiO2 had a lower band gap, leading to enhanced dye degradation compared to other catalysts. UV-vis spectra and the decolouration percentage of Methylene blue showed the superior photocatalytic activity of Zn-doped TiO2.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Syed Shahabuddin, Shahid Mehmood, Irfan Ahmad, Nanthini Sridewi
Summary: 2D-WS2 incorporated polyaniline nanocomposites (WS2-PANI) with varying WS2 loadings were synthesized via an easy in situ oxidative polymerization technique, which effectively enhanced the photocatalytic degradation of methylene blue (MB) in wastewater. The physicochemical properties of WS2-PANI (1-5) nanocomposites were characterized using various techniques such as FT-IR, XRD, BET surface area, TGA, FESEM, and HRTEM. HRTEM analysis confirmed the layered structure of WS2 with periodic planes (100) separated by 0.27 nm. Under UV photo irradiation, WS2-PANI (1-5) demonstrated excellent photocatalytic performance for MB degradation, with 2 wt.% WS2-PANI showing the highest efficiency of 93% degradation within 90 minutes. Moreover, the catalytic material exhibited good reusability without significant loss of catalytic performance, even after five cycles.
Article
Environmental Sciences
Siva Chidambaram, Mohan Kumar Ganesan, Muthusamy Sivakumar, Saravanan Pandiaraj, Muthumareeswaran Muthuramamoorthy, Santhosh Basavarajappa, Abdulaziz Abdullah Al-Kheraif, M. L. Aruna Kumari, Andrews Nirmala Grace
Summary: The integration of semiconducting nanostructures with noble metal nanoparticles is increasingly favored for cost efficient energy and environmental applications. A facile aqueous synthesis method was reported to produce polymer-capped gold nanoparticles on free-standing 2D layered zinc oxide structures, resulting in ZnO/Au nanocomposites. The study found that the concentration of Au nanoparticles promoted the preferential growth of ZnO along the (002) wurtzite plane, with the resulting structures exhibiting improved absorptivity along the visible spectrum.
Article
Chemistry, Multidisciplinary
Yong Wang, Xiaolei Liu, Qingzhe Zhang, Chen Wang, Shengyun Huang, Yannan Liu, Ting Yu, Ruiqi Yang, Guozhu Chen, Mohamed Chaker, Dongling Ma
Summary: Researchers have developed a high-efficiency solar energy conversion material consisting of low-cost non-metal TiN nanoparticles and hydrophilic semi-reduced graphene oxide. The material has broadband solar absorption capability and can accelerate water evaporation, making it promising for freshwater production by solar steam generation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
M. Alahmadi, Wael. H. Alsaedi, W. S. Mohamed, Hassan M. A. Hassan, Mohammed Ezzeldien, Ahmed M. Abu-Dief
Summary: Here, we demonstrate the sample and low-cost hydrothermal synthesis of a nanocomposite of Bi2O3/MoSe2 for hybrid photocatalyst. The structure of the synthesized samples was characterized using various techniques, and the Bi2O3/MoSe2 nanocomposite showed enhanced photocatalytic activity due to its high crystallinity, surface area, and small particle size. The results indicate that the Bi2O3/MoSe2 sample exhibited the highest photocatalytic degradation efficiency for the disintegration of methylene blue under visible illumination.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2023)
Article
Environmental Sciences
Sucheewan Krobthong, Tipawan Rungsawang, Sutthipoj Wongrerkdee
Summary: ZnO nanoparticles were synthesized using precipitation and combustion techniques. The precipitation method resulted in larger crystal sizes compared to the combustion method, while the particle sizes were similar. The functional analysis revealed surface defects in the ZnO structures. In the photocatalytic degradation of methylene blue, ZnO precipitation exhibited better degradation performance due to its larger crystal sizes, which facilitated carrier movement and reduced electron-hole recombination. The crystallinity of ZnO nanoparticles is thus an important factor in photocatalytic activity. Furthermore, precipitation is an interesting method for synthesizing ZnO nanoparticles with large crystal sizes.
Article
Chemistry, Physical
P. Gnanamozhi, A. Monamary, S. David Jereil, J. Evangeline Pauline, J. Andrew Oswin Ratnam, A. Ganeshkumar, V. Pandiyan, Asma A. Alothman, Razan A. Alshgari, Mani Govindasamy
Summary: The study aims to eliminate toxic dyes in industrial wastewater by using aluminum-substituted zinc oxide nanoparticles before they enter water bodies. The substitution of aluminum modifies the crystal structure and enhances the optical absorption, thereby improving the photocatalytic activity of zinc oxide nanoparticles.
SURFACES AND INTERFACES
(2023)
Article
Engineering, Environmental
Mahboubeh Rabbani, Javad Shokrayian, Rahmatollah Rahimi, Rezvaneh Amrollahi
Summary: Zinc oxide and doped zinc oxide nanorods were successfully synthesized using a simple template-free precipitation technique, with meso-tetrakis (4-sulfonatophenyl) porphyrin immobilized on the zinc oxide nanorods. The photocatalytic activity of TPPS/ZnO was found to be higher than that of pure zinc oxide and doped zinc oxide under visible light irradiation, as revealed by various characterization techniques and degradation studies of methylene blue.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Ivana Jagodic, Imre Guth, Svetlana Lukic-Petrovic, Dragana Tamindzija, Daniela Sojic Merkulov, Nina Fincur, Szabolcs Bognar, Predrag Putnik, Nemanja Banic
Summary: Currently, environmental pollution by various organic pollutants such as organic dyes is a serious global issue. The aqueous environment is highly susceptible to the harmful effects of these organic compounds. The study investigated different Fe2O3/TiO2/PVC nanocomposites in tablet form for the photodegradation of methylene blue (MB) under simulated sunlight, as well as their potential antibacterial effects.
Article
Engineering, Environmental
Lili Chen, Xuemei Ren, Njud S. Alharbi, Changlun Chen
Summary: In this study, Co/Ni-MOFs@BiOI composites were successfully synthesized as a novel light-driven photocatalyst, greatly enhancing visible light absorption and promoting the photocatalytic degradation of cationic methylene blue without the need for any chemical additives. The composites also demonstrated efficient degradation of other dyes under visible light irradiation, with the primary reactive species being superoxide radicals.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Review
Materials Science, Biomaterials
R. Deepak Kasai, Devi Radhika, S. Archana, H. Shanavaz, Ravindranadh Koutavarapu, Dong-Yeon Lee, Jaesool Shim
Summary: Hydrogels are highly preferred materials in biomedical applications due to their distinctive traits and wide range of uses. Their flexibility, versatility, and close resemblance to living tissue make them important materials in medical applications, with potential for further exploration in tissue engineering and drug delivery.
INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS AND POLYMERIC BIOMATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Talshyn Begildayeva, Jayaraman Theerthagiri, Seung Jun Lee, Ahreum Min, Gyeong-Ah Kim, Sivakumar Manickam, Myong Yong Choi
Summary: Furfural oxidation was used as a replacement for the sluggish O-2 evolution reaction (OER). Pt-Co3O4 nanospheres were prepared through pulsed laser ablation in liquid (PLAL) for the paired electrocatalysis of hydrogen evolution reaction (HER) and furfural oxidation reaction (FOR). The FOR achieved a high furfural conversion of 44.2% with a major product of 2-furoic acid. The Pt-Co3O4 electrode exhibited a small overpotential of 290 mV at 10 mA cm(-2). As an anode and cathode in an electrolyzer system, the Pt-Co3O4 electrocatalyst required only a small applied cell voltage of about 1.83 V to deliver 10 mA cm(-2), compared with the pure water electrolyzer which required about 1.99 V. This study simultaneously realized the integrated production of energy-saving H-2 fuel at the cathode and 2-furoic acid at the anode.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Chae Eun Park, Gyoung Hwa Jeong, Jayaraman Theerthagiri, Hyeyeon Lee, Myong Yong Choi
Summary: In this study, a two-dimensional MXene was reshaped by a pulsed laser irradiation in liquid process, resulting in the formation of a TiO2@TiC core-shell structure with ultrasmall Pt nanoparticles decorated on the surface. These advances significantly enhanced the electrocatalytic hydrogen evolution reaction activity under visible light illumination, demonstrating excellent electrochemical and photoelectrochemical performance.
Article
Environmental Sciences
Adam Gopal Ramu, Asraltbold Saruulbuyan, Jayaraman Theerthagiri, Myong Yong Choi, Dongjin Choi
Summary: Arsenic (As(V))-contaminated water is a global threat to human health and the ecosystem due to its toxicity, carcinogenicity, and high distribution in water streams. A new ferrocene-encapsulated zeolitic imidazolate framework-67 (Fc-ZIF-67) material was synthesized for efficient As(V) removal from aqueous solutions at neutral pH. The Fc-ZIF-67 adsorbent showed superior As(V) adsorption performance with an adsorption capacity of 63.29 mg/g at neutral pH. The Langmuir and Freundlich isotherm models were used to analyze the adsorption behavior.
ENVIRONMENTAL RESEARCH
(2023)
Review
Biochemistry & Molecular Biology
Santhosh Kumar Nadikatla, Vinod Babu Chintada, Thirumala Rao Gurugubelli, Ravindranadh Koutavarapu
Summary: Researchers have focused on semiconductor photocatalysts, particularly ZnO-based heterostructures. ZnO is widely studied due to its availability, robustness, and biocompatibility. However, the limitations of ZnO, such as wide bandgap energy and quick recombination, have led to the exploration of techniques like doping and composite creation. Recent studies have shown that ZnO/CdS heterostructures perform better in photocatalysis under visible light. This review emphasizes the synthesis process, applications, and challenges of ZnO/CdS heterostructures.
Article
Computer Science, Information Systems
Lakshmiprasad Maddi, Khidhirbrahmendra Vinukonda, Thirumala Rao Gurugubelli, Ravindranadh Koutavarapu
Summary: An in-situ hydrothermal process was used to create Co-doped ZnO/CdS nanosheets, and the effects of Co ions on the test material's structural, morphological, optical, and magnetic characteristics were examined. The development of a hexagonal wurtzite structure was confirmed by XRD for both ZnO and CdS. SEM, TEM, and HR-TEM studies revealed a sheet-like morphology. Essential elements (S, Cd, O, Co, and Zn) were verified by elemental mapping and XPS examination. Co-doping significantly enhanced the nanosheets' ability to absorb light in the visible region. The bandgap energy (2.59 eV) was well-regulated and a yellow emission band at 577 nm was observed in the PL spectrum.
Article
Materials Science, Multidisciplinary
N. Sreeram, S. Yusub, A. Ramesh Babu, M. Venkateswarlu, G. Krishna Priya, V. Aruna, Ravindranadh Koutavarapu
Summary: The dielectric, physical, and optical properties of 5GeO2-30Li2O-55P2O5-(10-x)MgO-xCr2O3 (x varies from 0 to 0.9 mol%) glasses were investigated. The non-crystalline behavior of these glasses was analyzed using X-ray diffraction. The compact nature of the glasses was indicated by their physical parameters. The optical absorption spectra showed the presence of Cr3+ ions and the optical band gap and Urbach energy of the glasses were evaluated. Fourier-transform infrared and Raman spectra supported the structural changes in the glasses, while the emission and ESR spectra confirmed the presence of chromium ions.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Chemistry, Physical
Vinod Babu Chintada, Thirumala Rao Gurugubelli, Mohan Rao Tamtam, Ravindranadh Koutavarapu
Summary: This article focuses on the enhancement of physical and mechanical properties of nickel-phosphate/boron (Ni-P/B) electroless coatings in various industrial applications. It explores different coating materials and processes for manufacturing electroless coatings on different materials. The incorporation of secondary particles into an alloy matrix at different levels is discussed in detail. The effects of process parameters on mechanical characteristics of the coatings are also extensively researched and illustrated.
Article
Green & Sustainable Science & Technology
Hyuk Jun Kwon, Haerul Hidayaturrahman, Ravindranadh Koutavarapu, Tae Gwan Lee
Summary: This study comprehensively addresses the issue of larvae breakout in water filtration systems and provides potential solutions to prevent their escape into the water supply. The research findings emphasize the importance of reducing the uniformity coefficient of sand media to effectively prevent larvae release and highlight the significance of following the recommended backwash procedure.
Article
Chemistry, Physical
R. Joyce Stella, I. Sreevani, Thirumala Rao Gurugubelli, R. V. S. S. N. Ravikumar, Ravindranadh Koutavarapu
Summary: Efficient spatial charge separation and water remediation have been a major focus in recent years. The development of transition metal-doped nanocomposites has emerged as a new research endeavor. In this study, a Fe3+-doped CdO/ZnS nanocomposite was constructed and its improved photocatalytic performance was investigated. The nanocomposite exhibited excellent photocatalytic activity, stability, and recyclability, making it a promising material for applications in solar light absorption and water treatment.
Article
Chemistry, Physical
Mohan Rao Tamtam, Ravindranadh Koutavarapu, Gyu Sang Choi, Jaesool Shim
Summary: Xanthate pollution during mineral processing is a global challenge, but solar energy-induced photocatalysis offers a sustainable solution. In this study, a novel nano-hybrid was developed using Bi2WO6 and MoS2 as co-catalysts to address the limitations of low visible-light absorption and fast recombination of electron-hole pairs. The resulting hybrid demonstrated significantly improved photocatalytic ability for xanthate removal from wastewater.
Article
Social Sciences, Interdisciplinary
Yumeng Bao, Ravindranadh Koutavarapu, Tae-Gwan Lee
Summary: The anaerobic digestion of sewage sludge in South Korean wastewater treatment plants is affected by seasonal factors and other influences, resulting in lower digestion efficiency and gas production. This study aimed to improve the efficiency and gas production of sludge anaerobic digestion by adjusting the operational parameters using data mining techniques. An artificial neural network (ANN) technology was used to adjust the range of the organic loading rate (OLR) and hydraulic retention rate (HRT) based on experimental data from a wastewater treatment plant in Daegu City, South Korea. The results showed that the ANN model improved digestion efficiency by 0.5% and gas production by 1.3% at specific OLR and HRT ranges.
Article
Engineering, Environmental
R. Naveen, M. C. Rao, Kamaluddin Syed, Jaesool Shim, Ravindranadh Koutavarapu
Summary: Novel LiZnBO3 nanosheets doped with iron ions (Fe3+-doped LZB) were synthesized using an in-situ hydrothermal technique. The synthesized materials were evaluated for their photocatalytic efficiency in degrading potassium butyl xanthate (PBX) under visible light. The optimized Fe3+-doped LZB photocatalyst demonstrated significantly better PBX degradation efficiency and a higher rate constant compared to pure LZB. The improvement in photocatalytic performance was attributed to the incorporation of iron ions, which enhanced visible light absorption and efficient charge separation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Pugalenthi Ramesh, A. Alvin Kalicharan, Jayaraman Pitchaimani, Ravindranadh Koutavarapu
Summary: This article mainly describes the use of efficient and eco-friendly dual-role oxidants, sodium periodate and meta-chloroperoxybenzoic acid, for iodination, oxidation, and reduction of the surface of graphite, resulting in halogenated graphene oxide and reduced graphene oxide materials. This one-step synthesis method is simple and can produce materials with various applications.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Alvin Kalicharan, Vudata Rajesh, Jayaraman Pitchaimani, A. Rajalakshmi, Sellamuthu Kathiresan, Ravindranadh Koutavarapu, Mohan Rao Tamtam, Pugalenthi Ramesh
Summary: This study synthesized a covalently bound amine and alcohol-functionalized graphite material, and investigated their application in electrochemical double-layer capacitors. The results showed that the hydroxy-functionalized amino alcohol improved the dispersion stability and wettability of the graphite material, and enhanced the electrochemical performance through electron donation.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
