Article
Physics, Multidisciplinary
Samira Mohammad Darvish, Amir Ali Masoudi, Abdollah Mortezaali, Zahra Sadat Hosseini
Summary: This study focuses on the preparation of silicon dioxide-titanium dioxide (SiO2-TiO2) thin films with different thicknesses using a dip-coating method. The aim is to improve the photocatalytic and hydrophilicity properties of the film by optimizing the thickness. The results show that increasing the thickness leads to higher surface roughness and a decrease in band gap, making the film more suitable for photocatalytic activity in visible light. The presence of defects in the 336 nm thick film also contributes to the improved charge carrier separation. XPS analysis is used to determine the chemical composition and the main parameters affecting photocatalytic performance, such as defect concentrations, grain boundaries, and surface roughness. The 336 nm thick film exhibits the highest photodegradation rate under visible light. This research provides valuable insights into the structural and optical properties of SiO2-TiO2 thin films for enhanced photocatalytic activity in the visible light region.
Article
Energy & Fuels
Ioana Tismanar, Alexandru Cosmin Obreja, Octavian Buiu, Anca Duta
Summary: This research reports on the fabrication of visible and solar-active photocatalytic bi-layered films, and the testing of their crystallinity degree, surface morphology, and elemental composition. The results showed that increasing the filler content can improve the process efficiency at high irradiance values, but the increase in photocatalytic efficiencies is limited due to electron-hole recombination. The thin films also demonstrated good stability in aqueous medium.
Article
Chemistry, Inorganic & Nuclear
Ghader Hosseinzadeh, Naser Ghasemian, Sahar Zinatloo-Ajabshir
Summary: The TiO2/graphene nanocomposite supported on clinoptilolite nanoplate prepared by hydrothermal method showed significantly higher photocatalytic degradation efficiency for nitenpyram insecticide under visible light, mainly due to the advantages of clinoptilolite and graphene, such as microporous structure and enhancement of effective surface area. The hydroxyl radicals were identified as the main active species responsible for the photocatalytic degradation of nitenpyram. This study provides a new insight for fabricating more effective zeolite and graphene-based nanocomposite photocatalysts for environmental remediation.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
S. Jagadeesh Babu, Murthy Muniyappa, Rao V. Navakoteswara, Ravi Mudike, Mahesh Shastri, Sardar Tathagata, Prasanna D. Shivaramu, M. V. Shankar, C. S. Ananda Kumar, Dinesh Rangappa
Summary: This work reports an improved hydrogen evolution activity of visible light active TiO2-x photocatalyst by introducing reduced graphene oxide. The characteristic studies reveal that RGO/TiO2-x nanocomposites were sufficiently durable and efficient for photocatalytic hydrogen generation under the visible light spectrum.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Qi Wang, Wenming Zhang, Xiaoru Hu, Limei Xu, Guodong Chen, Xiaochen Li
Summary: A novel hollow-sphere structure of WO3/TiO2 heterojunction was prepared by a combination of hydrothermal and calcination method. The heterojunction showed improved photocatalytic performance in degrading dye and micro-organic pollutant, with TiO2 acting as a photo-generated hole acceptor to enhance photocatalytic efficiency. This makes it a promising candidate for wastewater treatment.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Suqing Wu, Xueyan Li, Yanqin Tian, Yan Lin, Yun Hang Hu
Summary: Black anatase-TiO2 shows higher efficiency in visible light photocatalytic tetracycline degradation compared to white TiO2 and N-doped TiO2, with a different degradation mechanism involving both O-2(-) and h(+) radicals.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
S. Sudhagar, S. Sathees Kumar, I. J. Isaac Premkumar, V. Vijayan, R. Venkatesh, S. Rajkumar, Mandeep Singh
Summary: The hydrothermal method was used to synthesize TiO2 nanoparticles and TiO2/La2O3, TiO2/Al2O3 composites. The crystal structure, shape, and optical characteristics were studied using FTIR spectroscopy, XRD, UV-Vis absorption spectroscopy, and SEM. Photocatalytic properties were evaluated by degrading methylene blue (MB) and crystal violet (CV) dyes under UV and visible light. TiO2/La2O3 exhibited the highest photocatalytic efficiency, while TiO2/Al2O3 showed the lowest efficiency.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yanhui Ge, Hao Luo, Juanru Huang, Zhiming Zhang
Summary: The study presents a simple strategy for synthesizing visible-light-active TiO2 photocatalysts with high efficiency in degrading organic dyes, capable of efficiently removing Rh B and MB within a short period of time.
Article
Chemistry, Multidisciplinary
Mabkhoot Alsaiari
Summary: Efforts to create a novel visible light efficient photocatalyst using biomass derived active carbon modified TiO2 have shown successful results in reducing chromium (VI) to chromium (III) under visible light. The developed photocatalysts demonstrated enhanced photo-reduction efficiencies and recyclability, with promising potential for practical applications.
ARABIAN JOURNAL OF CHEMISTRY
(2021)
Article
Environmental Sciences
S. Sugashini, T. Gomathi, R. Aruna Devi, P. N. Sudha, K. Rambabu, Fawzi Banat
Summary: The study successfully synthesized a biocomposite-based nano-photocatalyst using sol-gel technique, which showed excellent photocatalytic performance in degrading crystal violet dye, achieving 95% degradation under visible light irradiation.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Aleesha Ali, Mohd Shoeb, Baoan Li, Mohd Asim Khan
Summary: This study investigated the effect of reduced graphene oxide on the photocatalytic activity of MoO3/TiO2 nanocomposites. The results showed that the addition of reduced graphene oxide enhanced the photocatalytic activity and achieved degradation of drugs and dyes through electrostatic interactions and synergistic effects.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Ju-Seong Choi, Sungjin Kim, Yongheum Choi, Kwang Bok Kim, Hyun-Jong Kim, Tae Joo Park, Young Min Park
Summary: Ag-decorated CuO@TiO2 semiconductor heterojunctions were successfully prepared and exhibited excellent performance in visible light photocatalysis applications. The high decomposition efficiency was achieved through the combined effects of the conformal core-shell heterojunction formed by atomic layer deposition and the well-distributed Ag nanoparticles.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Environmental
Xin Yu, Jielin Huang, Jingjing Zhao, Shuaifei Liu, Dandan Xiang, Yanting Tang, Juan Li, Quanhui Guo, Xinqi Ma, Junwei Zhao
Summary: Efficient visible light photocatalytic elimination of pharmaceutical factory wastewater was achieved by introducing hybrid Ag/AgCl nanoparticles into Ti3+ self-doped TiO2 mesocrystals. The Ag/AgCl@Ti3+-TiO2 mesocrystals showed superior performance in degrading tetracycline under visible light, mainly attributed to the continuous attacks of photo-generated holes and radicals on tetracycline molecules.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Jiangpeng Wang, Yaoxun Fang, Wenxuan Zhang, Xuelian Yu, Lin Wang, Yihe Zhang
Summary: The TiO2/BiOBr 2D-2D heterojunction photocatalysts showed excellent photocatalytic nitrogen fixation activity with a maximum NH3 production rate of 1.43 mmol/g/h for the 15% TiO2/BiOBr catalyst, which was about 4 times higher than that of pure BiOBr. The enhanced performance can be attributed to the 2D interface between TiO2 and BiOBr nanosheets, which facilitates the transfer of photogenerated electrons and increases electron participation in the nitrogen fixation reaction. This study highlights the potential of 2D-2D heterojunctions as an effective strategy to enhance solar energy utilization.
APPLIED SURFACE SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Laxmi Prasad Rao Pala, Nageswara Rao Peela
Summary: An optofluidic planar microreactor has been developed for oxygen production through water splitting under visible light illumination. The thickness of the catalyst coating and the reactant flow rate were found to significantly impact the rate of oxygen production.
Article
Energy & Fuels
S. Z. Razali, R. Yunus, Suraya Abdul Rashid, Hong Ngee Lim, B. Mohamad Jan, H. A. Hamid
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2020)
Article
Optics
Ali Abdulkhaleq Alwahib, Sarmad Fawzi Alhasan, Mohd Hanif Yaacob, Hong Ngee Lim, Mohd Adzir Mahdi
Article
Chemistry, Analytical
Saad Hayatu Girei, Hong Ngee Lim, Muhammad Zamharir Ahmad, Mohd Adzir Mahdi, Ahmad Rifqi Zain, Mohd Hanif Yaacob
Article
Chemistry, Analytical
Saad Hayatu Girei, Mohammed Majeed Alkhabet, Yasmin Mustapha Kamil, Hong Ngee Lim, Mohd Adzir Mahdi, Mohd Hanif Yaacob
Summary: An optical fiber coated with graphene oxide was developed for monitoring ammonia absorbance response at visible and near-infrared wavelengths. The study showed better performance in the near-infrared region and high sensitivity and fast response and recovery times. Additionally, the sensor exhibited selectivity towards ammonia with no response to other gases.
Article
Pharmacology & Pharmacy
Siti Norain Harun, Haslina Ahmad, Hong Ngee Lim, Suet Lin Chia, Martin R. Gill
Summary: Ru-PIP is a potential anticancer drug that acts by inhibiting DNA replication, and its limited bioavailability can be overcome by using mesoporous silica nanoparticles (MSNs) as a drug delivery agent. Encapsulated Ru-PIP in MSNs exerted significant cytotoxicity on cancer cell lines, indicating the potential of MSNs as an ideal drug delivery agent for sustained release of Ru-PIP by diffusion.
Article
Energy & Fuels
Soon Poh Lee, Gomaa A. M. Ali, H. H. Hegazy, Hong Ngee Lim, Kwok Feng Chong
Summary: Reduced graphene oxide (rGO) aerogels with different precursor graphene oxide sheet sizes were synthesized using L-ascorbic acid reduction and ambient pressure drying method. The optimized sheet size resulted in strong parallel sheet stacking, providing mechanical strength and high surface area for enhanced electrochemical properties, making it an excellent electrode material for a supercapacitor.
Article
Chemistry, Physical
Maureen O. Chijioke-Okere, Zul Adlan Mohd Hir, Cynthia E. Ogukwe, Paschal C. Njoku, Abdul H. Abdullah, Emeka E. Oguzie
Summary: This study focused on TiO2-polyethersulfone films as photocatalysts for acetaminophen degradation, with varying TiO2 loadings. Characterization was done using XRD, SEM-EDX, AFM, and XPS. The study showed that the TiO2-PES film with 14 wt% TiO2 content exhibited 51% degradation efficiency at 80 cm(2) surface area, reaching a maximum of 80% at 320 cm(2).
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Review
Polymer Science
Mahnoush Beygisangchin, Suraya Abdul Rashid, Suhaidi Shafie, Amir Reza Sadrolhosseini, Hong Ngee Lim
Summary: Polyaniline (PANI) is a well-known conductive polymer that has attracted significant attention in the field of nanotechnology. This review focuses on the preparation processes and various properties of PANI thin films, discussing its potential applications in electronics, drugs, and anti-corrosion materials. PANI's unique characteristics, such as high conductivity, easy synthesis, and environmental stability, make it a promising material for a wide range of applications.
Article
Polymer Science
Hayati Mohamad Mukhair, Abdul Halim Abdullah, Zulkarnain Zainal, Hong Ngee Lim
Summary: The effectiveness of PES-Ag3PO4/g-C3N4 film photocatalyst in degrading methyl orange dye under visible light irradiation was explored in this study. The results showed that 13 wt % loading of Ag3PO4/g-C3N4 composite was the best for maintaining degradation performance. The predominant species responsible for methyl orange degradation were found to be O-2(-) and h(+).
Article
Water Resources
Aloysius Akaangee Pam, Zul Adlan Mohd Hir, Abdul Halim Abdullah, Yen Ping Tan
Summary: This study established a novel approach for synthesizing a new adsorbent to remove Pb(II) ions from aqueous solution, showing good micropores structure and high surface area suitable for liquid phase adsorption. Langmuir model and pseudo-second-order equation were found to best fit the data, suggesting adsorption control by chemical reaction.
APPLIED WATER SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Nur Shamimie Nadzwin Hasnan, Mohamad Azuwa Mohamed, Zul Adlan Mohd Hir
Summary: The review discusses the wide exploration of graphitic carbon nitride (g-C3N4) in various photocatalytic applications, highlighting strategies such as surface functionalization, defect creation, and elemental doping to enhance its structural and chemical properties. The importance of superactive photocatalytic activity at a molecular level for sustainable environmental and energy-related applications is emphasized as a crucial area for future research and development.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Review
Chemistry, Physical
Zul Adlan Mohd Hir, Abdul Halim Abdullah
Summary: The progress of hybrid polymer-based photocatalytic materials for removing hazardous chemicals in water has attracted significant attention. Surface or bulk modifications can enhance their efficacy for the removal of pollutants.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Chemistry, Physical
Hartini Ahmad Rafaie, Nurul Infaza Talalah Ramli, Zuraida Khusaimi, Mohd Arif Mohd Sarjidan, Paweena Dulyaseree, Zul Adlan Mohd Hir
Summary: Endocrine-disrupting chemicals (EDCs) in the aquatic environment have been recognized as major polluting agents. Photocatalytic removal using silver carbonate (Ag2CO3)-based photocatalyst is a promising process for eliminating EDCs due to its unique characteristics. The performance of Ag2CO3 has been improved through element doping and optimization of operational parameters. This review summarizes investigations on Ag2CO3-based photocatalytic materials for EDC removal, suggesting the need for a cutting-edge protocol in water recovery to successfully eliminate EDCs.
Article
Chemistry, Multidisciplinary
Huey Jing Tan, Zulkarnain Zainal, Zainal Abidin Talib, Hong Ngee Lim, Suhaidi Shafie, Sin Tee Tan, Noor Nazihah Bahrudin
Summary: Improving the photoelectrochemical performance of cadmium sulfide (CdS) thin films through preheating treatment and their combination with zinc oxide (ZnO) enables the creation of efficient heterostructures for solar cells.
Article
Nanoscience & Nanotechnology
N. S. K. Gowthaman, Hong Ngee Lim, Sekar Shankar
ACS APPLIED NANO MATERIALS
(2020)