Article
Biochemistry & Molecular Biology
Agnieszka Sienkiewicz, Paulina Rokicka-Konieczna, Agnieszka Wanag, Ewelina Kusiak-Nejman, Antoni W. Morawski
Summary: This study presents the visible-light photocatalytic performance of 3-aminopropyltriethoxysilane (APTES)-modified TiO2 nanomaterials obtained by solvothermal modification and calcination. The APTES/TiO2 photocatalysts exhibit higher pore volume and specific surface area, and the adsorption process negatively affects the photocatalytic properties. The highest dye decomposition degree is observed for nanomaterials calcined at 900 degrees C with optimal APTES concentration of 500 mM.
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
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
Materials Science, Multidisciplinary
Wen Sun, Xuankun Li, Jingtao Zou, Han Guo
Summary: N-doped TiO2 with small crystallite size and good dispersibility was successfully synthesized using a hydrolysis precipitation method. The N-TiO2 showed excellent photocatalytic activity for the degradation of organic pollutants under blue light LED irradiation. Immobilizing N-TiO2 on SiC ceramic foam resulted in a promising photocatalytic material with high stability and efficiency.
Article
Materials Science, Ceramics
E. Burak Ertus, Cekdar Vakifahmetoglu, Abdullah Oztuerk
Summary: The research found that porous glass embedded with titanium dioxide has a higher efficiency in methylene blue removal, mainly due to its high specific surface area and dispersion of nano-sized anatase TiO2 crystallites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Review
Chemistry, Multidisciplinary
Ethan Dern Huang Kong, Jenny Hui Foong Chau, Chin Wei Lai, Cheng Seong Khe, Gaurav Sharma, Amit Kumar, Suchart Siengchin, Mavinkere Rangappa Sanjay
Summary: Water pollution is a global issue that conventional methods struggle to solve, but photocatalysis, especially with GO/TiO2 composites, shows promising results in wastewater treatment.
Review
Chemistry, Multidisciplinary
Yinchuan Yang, Qinlin Zhu, Xuwen Peng, Jingjing Sun, Cong Li, Xinmiao Zhang, Hao Zhang, Jiabin Chen, Xuefei Zhou, Hongbo Zeng, Yalei Zhang
Summary: This article reviews the use of hydrogels for the removal of methylene blue from wastewater, including discussions on hydrogel preparation and properties, adsorption performance and mechanisms, reusability, and comparison with other oxidation methods.
ENVIRONMENTAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Sile Liu, Yifu Bu, Song Cheng, Rongrong Tao
Summary: TiO2/g-C3N5 heterojunction is synthesized for the photocatalytic degradation of methylene blue under visible light irradiation. The characterization analysis shows that TiO2/g-C3N5 has good crystallinity and performs well in MB photocatalytic degradation. The MB removal rate of TiO2/g-C3N5 is 97.4% at a concentration of 20 mg/L, significantly higher than TiO2 and g-C3N5. The visible light adsorption ability and photogenerated carrier separation of TiO2/g-C3N5 are improved, leading to enhanced MB photocatalytic degradation. TiO2/g-C3N5 also exhibits good reusability with 95.8% initial removal after 5 cycles. The mechanism of MB photocatalytic degradation on TiO2/g-C3N5 is consistent with the direct Z scheme mechanism based on band gap structure calculations.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Agricultural Engineering
Nina Yan, Biao Hu, Zhiyu Zheng, Haiying Lu, Jingwen Chen, Xiaomei Zhang, Xizhi Jiang, Yonghong Wu, Jan Dolfing, Lei Xu
Summary: A method of preparing magnetic, recyclable biochar with minimal pore blockage was developed by loading ultrafine magnetite onto ball milled biochar and then milling it for a second time. The deposited magnetite did not significantly wrap the biochar, resulting in a decreased sorption performance. However, the extra milling step restored the surface functional groups and specific surface areas, leading to a 93.8% recovery adsorption of 84.6 +/- 2.5 mg/L on methylene blue. The recyclability of the material was not affected, and the adsorption was driven by multiple interactions. This twice-milled magnetic biochar is highly efficient for sustainable removal of aqueous contaminants.
BIORESOURCE TECHNOLOGY
(2023)
Article
Polymer Science
Nesrine Amor, Muhammad Tayyab Noman, Michal Petru
Summary: This study utilized deep neural network to predict the removal of methylene blue dye under the influence of titanium dioxide nanoparticles. The results showed that the DNN model provided a high performance accuracy for predicting dye removal and could be used as a powerful tool for predicting the functional properties of other nanocomposites.
Article
Environmental Sciences
Sp Keerthana, R. Yuvakkumar, G. Ravi, S. Hong, Abdullah G. Al-Sehemi, Dhayalan Velauthapillai
Summary: Pristine and Ce doped TiO2 nanoparticles were fabricated to remove toxic pollutants from wastewater. The doping of Ce ions improved the surface roughness and reduced the particle size of the TiO2 photocatalysts. The 4% Ce-TiO2 catalyst exhibited higher efficiency and activity compared to pure TiO2, making it a potential candidate for efficient wastewater management.
Article
Chemistry, Inorganic & Nuclear
Mohamed A. Farghali, Ramadan M. El Bahnasawy, Taher A. Salaheldin
Summary: A magnetic graphene nanocomposite (Fe3O4/G) was successfully synthesized and characterized for methylene blue dye removal, showing excellent adsorption efficiency. The nanocomposite exhibited fast magnetic separation due to the magnetic properties of the magnetite nanoparticles, achieving 100% removal efficiency for MB dye. The adsorption behavior followed a pseudo-second-order kinetic model, with equilibrium reached after 15 minutes, and the equilibrium data fit well with Langmuir and Freundlich isotherm models.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Yang Zeng, Xiangtao Tang, Yan Qin, Adila Maimaiti, Xudong Zhou, Yujie Guo, Xin Liu, Wenqing Zhang, Jie Gao, Lingfan Zhang
Summary: In this study, a melamine sponge composite called SA/CMC-MeS was prepared through crosslinking strategy, which showed enhanced adsorption performance for methylene blue (MB). The adsorption process of SA/CMC-MeS followed the Langmuir model and pseudo-second-order kinetic model, with a theoretical maximum adsorption capacity of 230 mg/g (pH 8). The adsorption mechanism was attributed to the electrostatic attraction between the carboxyl anions on the composite and the dye cations in solution. SA/CMC-MeS could selectively separate MB from binary dye system and had positive anti-interference ability in the face of coexisting cations.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Polymer Science
V. Snowlin, H. Joy Prabu, A. Felix Sahayaraj, I. Johnson, Ebenezer Thaninayagam, R. R. Gopi, J. Salamon, A. Simi
Summary: Water pollution due to industrial development and the release of harmful dyes in wastewater has become a significant environmental threat. This article focuses on using a zinc-metal organic framework (Zn-MOF) to adsorb the organic dye methylene blue from wastewater under sunlight. The synthesized Zn-MOF has a cubic form with a pore volume of 0.006 cc/g and a surface area of 4.705 m(2)/g. It shows potential as an effective adsorbent for the treatment of wastewater.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Feven Kassaye Egualle, Richard Appiah-Ntiamoah, Shimelis Kebede Kassahun, Hern Kim
Summary: By tuning the phase and pore structure of zinc hydroxide/zinc oxide (Zn(OH)2/ZnO) nanostructures, the pH limitations in the adsorption of methylene blue (MeB) are overcome by achieving pH-independent interfacial pore-filling reactions.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Composites
A. Rahaman, Kamal K. Kar
Summary: The objective of this work was to grow carbon nanocoils on the glass fiber surface and prepare laminated composites, achieving reinforcement effect. Spring-like CNCs were obtained at 600 degrees C, while single helix CNCs were found at 700 degrees C. The CNC-coated GF-based epoxy composites exhibited good mechanical properties.
COMPOSITE INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Bhoomika Yadav, Kamal K. Kar, Manas K. Ghorai, Devendra Kumar, Dharmendra Yadav
Summary: In this study, the effect of extrinsic and intrinsic point defects on the conductivity and dielectric behavior of CCTO synthesized using the molten salt method was investigated. It was found that extrinsic defects migration caused dielectric loss at low temperatures, while long-range conduction due to intrinsic defects accumulation resulted in higher losses at high temperatures. By doping Mg into CCTO, the loss was reduced and an almost temperature-independent dielectric constant was achieved.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Kiran Kumar Surthi, Kamal K. Kar
Summary: A unique approach of Co-doping at the Mn site was used to prepare spherical shaped LiMn0.5Co0.5PO4@C (LMCP@C) nanoparticles. The study explored the structure and properties of LMCP@C nano-particles through high-resolution transmission electron microscopy and XPS analysis. The results of first-principle calculations and electrochemical analysis showed that Co doping improved the electrochemical performance of the material, resulting in higher operating voltage, specific capacity, energy, and power density in lithium-ion batteries.
Article
Chemistry, Multidisciplinary
Bhoomika Yadav, Prerna Sinha, Kamal K. Kar, Manas K. Ghorai, Devendra Kumar
Summary: This study investigates the effect of iodine substitution on the dielectric and resistive properties of CaCu3Ti4O12 ceramics. The results show that the grains, grain boundaries, and sample-electrode interface contribute to the electrical response, which can be represented by three equivalent circuits. Iodine doping leads to a large increase in resistance and changes the charge compensation mechanism. The study confirms the successful synthesis of iodine-substituted CCTO ceramics.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Green & Sustainable Science & Technology
A. Tyagi, K. K. Kar
Summary: This study reports the gas template-assisted hydrothermal preparation of NiS impregnated on N, S-rich nanocarbon composite, which serves as a pH-universal electrocatalyst for oxygen reduction reaction (ORR) in hydrogen fuel cells and metal-air batteries. The unique microflower-like superstructures formed by interconnected nanosheets provide pathways for gas transport and charge transfer, leading to improved ORR performance.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Materials Science, Multidisciplinary
Prerna Sinha, Kamal K. Kar, Amit K. Naskar
Summary: This work designs high energy density flexible devices using asymmetric configuration and two active electrode materials. The devices exhibit significantly high capacitance and excellent rate capability. The charge storage activity and device stability can be enhanced by introducing redox-active electrolytes, but the rate capabilities deteriorate at high current densities.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Ceramics
Bhoomika Yadav, Kamal K. Kar, Manas K. Ghorai, Devendra Kumar
Summary: AC electrical measurements were conducted on iodine-doped CaCu3Ti4O12-xIx ceramic specimens. The crystalline structure, microstructure, and oxidation state of various ions were analyzed using XRD, SEM, and XPS. Dielectric relaxations in different compositions were investigated and similar charge carriers were found in conduction and relaxation processes. The XPS study revealed a reduction in [ VO center dot center dot ] concentration and an increase in [ V '' M] with increasing iodine concentration. Metal ions were found to segregate at grain boundaries, leading to increased resistivity and minimized dielectric losses. A high concentration of iodine doping promoted the formation of a barrier layer capacitor.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Jitendra Tahalyani, M. Jaleel Akhtar, Kamal K. Kar
Summary: This study focuses on the design and development of lightweight, flexible, and thin nanocomposite structures with enhanced electromagnetic interference (EMI) shielding. It was found that embedding 6 wt% graphene nanoplatelets (GNPs) in a polyurethane matrix provides excellent conductive and dielectric properties in the specified frequency band. Numerical simulation and mechanical bending tests confirm the high shielding effectiveness and reliability of the proposed flexible structure.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2022)
Article
Chemistry, Multidisciplinary
Ravi Nigam, Kamal K. Kar
Summary: Supercapacitors are energy storage devices with high capacitance, power density, cycle life, and low cost. The formation of an electric double layer at the electrode-electrolyte interface is crucial for energy storage. Simulation studies have been conducted to explore the characteristics of supercapacitors by examining different electrode structures and electrolyte effects.
Article
Electrochemistry
Prerna Sinha, Kamal K. Kar
Summary: This study utilizes a chemical-free, low-cost, simple, scalable, and facile synthesis technique to prepare composite electrodes for supercapacitor application. The focus is on delivering actual performance by eliminating the use of traditional equations, showcasing excellent capacitance and energy density, and opening up new possibilities in hybrid energy storage systems.
ELECTROCHIMICA ACTA
(2022)
Article
Nanoscience & Nanotechnology
Jitendra Tahalyani, Mohammad Jaleel Akhtar, Kamal K. Kar
Summary: Flexible graphene nanoplatelets (GNPs) and functionalized carbon nanofibers (FCNFs) are synthesized to enhance the electromagnetic interference shielding effectiveness (EMI SE) of flexible electromagnetic shielding materials (ESMs). These materials are embedded in a polyurethane (PU) matrix to create lightweight, highly stretchable, and thin nanocomposites. The addition of GNPs to FCNF4 improves the total EMI SE (SET) value, reaching a maximum of 60.55 dB for FCNF/GNP (4/6 wt %). The nanocomposites exhibit negligible changes in EMI SE after mechanical bending and sonication in water, indicating their effectiveness in complex environmental conditions. The practical applicability of the fabricated nanocomposites in conformal devices is verified through testing at different bending radii in a waveguide. EMI shielding is also evaluated through simulation in the CST microwave studio tool, extending the analysis for broadband frequency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Ravi Nigam, Kamal K. Kar
Summary: The continuum theory was used to analyze the electric double layer in electrode materials with different morphologies. The study found that thickness, particle size, and porosity all affect the specific capacitance of the double layer. Different morphologies have different numbers of spheres in a unit cell, and the critical thickness of the electrodes is the same for all morphologies. The energy storage capabilities of electrodes increase with a more dense packing of carbon particles.
Article
Nanoscience & Nanotechnology
Jitendra Tahalyani, Mohammad Jaleel Akhtar, Kamal. K. K. Kar
Summary: Flexible, highly stretchable, low percolation threshold, and ultralightweight microwave absorbers have been fabricated by growing crystalline carbon nanotubes on carbon fibers using chemical vapour deposition technique and embedding them in polyurethane. The optimal thickness of the microwave absorbers has been determined through simulation and experimental verification. These absorbers exhibit excellent performance with minimal reflection loss and wide effective absorber bandwidth, even after undergoing 1000 bending cycles and 2 hours of water-bath sonication. The mechanism of microwave absorption in carbon fiber and carbon nanotubes-based absorbers has been elucidated and their application has been extended to the Ku band.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Sugandha Singh, Manas K. Ghorai, Kamal K. Kar
Summary: A conjugated mesoporous polymer TBPA-phen was synthesized and modified in situ with cobalt to form Co@TBPA-phen. The polymers showed charge-separated state and semiconducting behavior at room temperature. The study revealed that the Co@TBPA-phen exhibited significant electrochemical activity for multiple reactions such as oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), and oxygen evolution reaction (OER), making it a promising electrocatalyst for energy storage applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Sugandha Singh, Manas K. Ghorai, Kamal K. Kar
Summary: We report a novel redox-active hybrid coordination polymer TPA-tpd-Co, synthesized via Schiff-base condensation and self-assembly, which exhibits a charge-separated state and semiconducting behavior with facile charge transfer. The polymer shows irregular spherical morphology, substantial permanent porosity, and low-angle crystallinity. With a low amount of cobalt, it exhibits trifunctionality as an electrocatalyst with high stability in different pH environments. Moreover, it shows appreciable stability and specific capacity in an aqueous Zn-air battery, suggesting its potential in electrocatalysis.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)