Article
Chemistry, Physical
Emmanuel M. de la Fourniere, Jorge M. Meichtry, Eduardo A. Gautier, Ana G. Leyva, Marta Litter
Summary: The degradation mechanism of ethylmercury chloride under UV/TiO2 photocatalysis was investigated, revealing the products and degradation pathways, and proposing a mechanism involving oxidative and reductive one-electron transfer steps.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Engineering, Environmental
Yi Chen, Shengrui Tong, Weiran Li, Yanping Liu, Fang Tan, Maofa Ge, Xiaofeng Xie, Jing Sun
Summary: This study demonstrated the formation of H2SO4 aerosols (SA(g-H2SO4)) in yields of 10.10-32.64% during the photocatalysis process of SO2 by TiO2 under various relative humidity conditions, with gaseous (OH)-O-center dot and H2O2 identified as the determining factors. The role of the released gaseous (OH)-O-center dot and H2O2 in atmospheric chemistry was proven to be significant, highlighting the impact of photocatalytic materials on secondary pollution.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Fangyuan Zheng, Joana M. Queiros, Pedro M. Martins, Roberto Fernandez de Luis, Arkaitz Fidalgo-Marijuan, Jose L. Vilas-Vilela, Senentxu Lanceros-Mendez, Javier Reguera
Summary: A large number of emerging contaminants, such as pharmaceuticals, are difficult to remove from water bodies using conventional treatment methods, leading to serious environmental issues. Semiconductor-based photocatalysis has emerged as an exciting solution for the degradation of these pollutants. However, the diverse chemical composition of pharmaceutical pollutants poses challenges in selecting suitable photocatalysts for efficient and broad removal, necessitating systematic studies on the physicochemical properties of photocatalysts and pollutants.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Alejandra Romero-Moran, Jose L. Sanchez-Salas, Joel Molina-Reyes
Summary: The study established the influence of the crystalline phase and agglomeration degree of TiO2 nanoparticles on photocatalytic hydroxyl radical formation and bacterial inactivation in TiO2/SiO2 composite coatings. A relationship between hydroxyl radicals' formation and charge carrier transfer mechanism between defect levels in SiO2 and TiO2 embedded nanoparticles was established through a simple spectroscopic method. This correlation complements the lack of mechanisms behind the photocatalytic activity in TiO2/SiO2 composites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Environmental Sciences
Luis A. Gonzalez-Burciaga, Cynthia M. Nunez-Nunez, Jose B. Proal-Najera
Summary: The study summarized the method of degrading cytostatic pollutants through TiO2 heterogeneous photocatalysis and its application scope, as well as outlined and discussed the removal of cytostatic drugs in wastewater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Engineering, Environmental
Sihyeon Jo, Sujin Im, Seunghyun Weon, Hyeyoung Shin, Jonghun Lim
Summary: Reduced TiO2 nanotube arrays (r-TNAs) have emerged as promising environmental materials for efficient treatment of persistent organic pollutants (POPs) resistant to conventional biological treatment. r-TNAs possess superior conductivity and solar light absorption, as well as well-organized open channel structures for efficient mass transfer. Additionally, r-TNAs can be grown directly on substrates without the use of adhesives, improving their durability and reusability. This paper provides a comprehensive review of r-TNAs in advanced oxidation processes (AOPs), including their fabrication techniques, appealing properties, and potential applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Carlo Boaretti, Martina Roso, Michele Modesti, Alessandra Lorenzetti
Summary: This study investigates the effect of ultrasounds on the degradation of formaldehyde-polluted aqueous solutions using combined advanced oxidation processes (AOPs) for potential application in wastewater treatment. Different nanostructured catalysts based on TiO2 and FeSO4 were tested after deposition on electrospun nanofibrous membranes. The results show that ultrasounds significantly increase the photocatalytic abatement of formaldehyde, but the effect is more limited for the sono-photo-Fenton configuration. However, the sono-photocatalytic-Fenton process exhibits a synergic effect and achieves the best results.
Article
Biochemistry & Molecular Biology
Mairis Iesalnieks, Raivis Eglitis, Talis Juhna, Krisjanis Smits, Andris Sutka
Summary: This study successfully prepared a transparent titanium dioxide coating on plastic substrates and demonstrated its high performance in photocatalytic degradation of organic pollutants. The coating can be applied to polymer substrates and exhibits good stability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Review
Chemistry, Multidisciplinary
Belen Vaz, Moises Perez-Lorenzo
Summary: Porphyrins have been widely used as photosensitizers in the field of photovoltaics and photocatalysis due to their ability to transfer energy from light-collecting areas to reaction centers, similar to natural photosynthesis. However, while solar cell development has led to continuous improvement in the molecular design of these pigments, these innovations have not been efficiently applied to dye-sensitized photocatalysis. This review aims to explore recent advances in the role of porphyrin structural motifs as sensitizers in TiO2-mediated catalysis, providing valuable insights for the development of more efficient photocatalysts.
Review
Chemistry, Multidisciplinary
Diana Rakhmawaty Eddy, Muhamad Diki Permana, Lintang Kumoro Sakti, Geometry Amal Nur Sheha, Solihudin, Sahrul Hidayat, Takahiro Takei, Nobuhiro Kumada, Iman Rahayu
Summary: This study aims to clarify the differences between titanium dioxide polymorphs and their properties in different photocatalytic applications. Homophase titanium dioxide has disadvantages such as high recombination rates and low adsorption capacity. On the other hand, heterophase titanium dioxide can effectively stimulate electron transfer and exhibit superior photocatalytic performance. Various biphase and triphase polymorphs of titanium dioxide are discussed, and the focus is on the synthesis and application of heterophase titanium dioxide as a photocatalyst.
Article
Chemistry, Multidisciplinary
Min Huang, Shuyi Zhang, Bo Wu, Xing Yu, Yongping Gan, Tiejun Lin, Fei Yu, Yuhan Sun, Liangshu Zhong
Summary: A tunable band structure W-doped TiO2 photocatalyst was designed for the photocatalytic oxidation of methane to C-1 oxygenates using O-2 at low temperature. The W-doping improved the photocatalytic performance, achieving a liquid oxygenates productivity of 12.2 mmol g(-1) and a selectivity of 99.4%. Additionally, the selectivity of COx was effectively decreased from 21.2% to 0.6%. W-doping not only enhanced light absorption but also promoted the separation of photo-generated carriers, improving methane conversion.
Article
Engineering, Environmental
J. Meijide, G. Lama, M. Pazos, M. A. Sanroman, P. S. M. Dunlop
Summary: Contaminants of emerging concern, including pharmaceuticals, are detected at low concentrations in surface waters, posing potential risks to aquatic life and the food chain. This review focuses on the removal of active pharmaceutical ingredients using ultraviolet processes, such as photo-Fenton, photocatalysis, and photoelectrocatalysis. However, there is limited research on scaling up the systems and testing their effectiveness in real water matrices.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Chaehun Lim, Ha-Rim An, Seongmin Ha, Seongjae Myeong, Chung Gi Min, Hea-Jong Chung, Byoungchul Son, Chang-Yeon Kim, Ji-In Park, Hyeran Kim, Hyun Uk Lee, Young-Seak Lee
Summary: We propose an underwater plasma method to produce nanoporous N-doped TiO2 (N-TiO2) photocatalysts with high reactivity in the visible light range. The unique energy input of this technology enables the synthesis, crystallization, doping, and porosity of TiO2 within minutes. The resulting N-TiO2 demonstrates a nanoporous structure with doped N atoms, which leads to narrow bandgap, effective charge-carrier separation, and enhanced light absorbing ability. The N-TiO2 photocatalysts exhibit efficient photocatalytic activities and excellent antibacterial ability, making them suitable for environmental and biomedical applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Patrick Hartwich, Christian Pritzel, Manuela S. Killian
Summary: This study proposes an alternative utilization of titanium dioxide by covering surfaces of cement-based materials with a regular-shaped monolayer of photocatalytically active titanium dioxide nanotube arrays. The study also presents a proposal for the synthesis of TiO2 nanotubes and transferring them onto material surfaces, providing the opportunity for applying the material to precast elements.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Valentin G. Bessergenev, Jose F. Mariano, Maria Conceicao Mateus, Joao P. Lourenco, Adwaa Ahmed, Martin Hantusch, Eberhard Burkel, Ana Maria Botelho do Rego
Summary: The dielectric properties and spectral dependence of the photocatalytic constant of Co doped P25 Degussa powder were studied. The research showed a concentration limit for cobalt distribution in the TiO2 matrix before metallic clusters form, and the formation of CoTiO3 phases during annealing at high temperatures. The temperature dependence of the dielectric constant indicated relaxation processes at temperatures below 400 degrees C and Ti-O octahedron reorientation at higher temperatures. The spectral dependency of the photocatalytic constant revealed the presence of electronic states within the energy gap of TiO2 for all nanopowdered samples.
Article
Biochemical Research Methods
Siti Roshayu Hassan, Nastaein Qamaruz Zaman, Irvan Dahlan
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Irvan Dahlan, Ng Wei Ling
Summary: This study successfully predicted and optimized the AV7 dye adsorption efficiency of RHA-CFA adsorbent using response surface methodology and artificial neural network. The numerical optimization revealed that the highest adsorption efficiency can be achieved under specific ratio and concentration conditions.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Irvan Dahlan, Siti Roshayu Hassan, Wen Jie Lee
Summary: By optimizing the RSM model, the optimal condition for improved anaerobic baffled reactor was determined, with predicted values for COD removal, lignin removal, and CH4 production found to be 97.6%, 65.8%, and 4.32 L CH4/gCOD removed, respectively. This result was further validated with an ANN model, demonstrating satisfactory performance of the MABR.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Haider M. Zwain, Basim K. Nile, Ahmed M. Faris, Mohammadtaghi Vakili, Irvan Dahlan
SCIENTIFIC REPORTS
(2020)
Article
Environmental Sciences
Siti Roshayu Hassan, Yung-Tse Hung, Irvan Dahlan, Hamidi Abdul Aziz
Summary: This study investigated the process kinetics of anaerobic digestion for treating recycled paper mill effluent. The results showed that hydrolysis was the rate-limiting step. The Monod and Contois kinetic models demonstrated satisfactory prediction capabilities.
Article
Engineering, Environmental
Haider M. Zwain, Hind Barghash, Mohammadtaghi Vakili, Irvan Dahlan
Summary: This study conducted anaerobic digestion of recycled paper mill wastewater in a high-rate anaerobic baffled reactor and optimized the process response using response surface methodology. The optimal conditions were determined to be CODin of 4,000 mg/L and HRT of 2 days, resulting in COD, BOD, and lignin removal efficiencies of 91%, 98%, and 71%, respectively.
Article
Engineering, Chemical
Irvan Dahlan, Wan Hamizan Wan Mazlan, Andi Mulkan, Haider M. Zwain, Siti Roshayu Hassan, Hamidi Abdul Aziz, Harahsheh Yazeed Ahmad, Ivar Zekker
Summary: Modeling and simulation of batch adsorption of methylene blue by modified MOF-5 were investigated. The adsorption capacity of modified MOF-5 was higher than pure MOF-5, and lower dye concentration, higher temperature, and lower adsorbent dosage resulted in higher dye adsorption capacity.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Environmental Sciences
Irvan Dahlan, Emillia Eizleen Md Azhar, Siti Roshayu Hassan, Hamidi Abdul Aziz, Yung-Tse Hung
Summary: In this study, response surface methodology (RSM) and artificial neural network (ANN) were used to investigate the adsorption process of 2,4-dichlorophenoxyacetic acid (2,4-D) using modified hydrogel. The results showed that higher removal and adsorption capacity of 2,4-D could be achieved at higher initial concentration, lower pH, and activated carbon content. The optimal design method of RSM had the highest accuracy for prediction and optimization. Bayesian Regularization method in ANN had the highest R-2 and lowest mean square error (MSE) with the optimum network architecture of 3:9:2. The RSM model was validated using the optimized neural network architecture.
Article
Chemistry, Applied
Ositadinma Chamberlain Iheanacho, Joseph Tagbo Nwabanne, Christopher Chiedozie Obi, Chinenye Adaobi Igwegbe, Chijioke Elijah Onu, Irvan Dahlan
Summary: In this study, the adsorptive dephenolization of aqueous solutions using thermally modified corn cob (TMCC) was investigated. The results showed that increasing the dosage and contact time of TMCC, as well as decreasing temperature and phenol concentration, favor the adsorption of phenol. The adsorption mechanism was found to involve intraparticle, film, and pore diffusion, as well as electrostatic attraction, pi-pi electron-donor interaction, and hydrogen bonding. The process was determined to be feasible, spontaneous, endothermic, and predominantly a physical process.
ADSORPTION SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Irvan Dahlan, Oh Hong Keat, Hamidi Abdul Aziz, Yung-Tse Hung
Summary: This study investigated the synthesis of MOF-5 and its modification for the removal of malachite green (MG) dye. Waste-derived siliceous materials, such as rice husk ash (RHA) and/or coal fly ash (CFA), were used to prepare modified MOF-5 adsorbents at different ratios. The MOF-5/RHA&CFA/2:1 adsorbent was found to be the most effective for MG dye removal from aqueous solutions. The adsorption characteristics of the modified MOF-5 for MG dye removal were studied by varying various parameters.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Engineering, Environmental
Andi Mulkan, Nurin Wahidah Mohd Zulkifli, Husni Husin, Irvan Dahlan, S. Syafiie
Summary: This study focuses on converting jackfruit peel waste into a solid catalyst for biodiesel synthesis. By calcining the peel waste ash at different temperatures, it was found that calcination at 500 degrees C yielded the highest ash production of 92.38%. Potassium, calcium, and magnesium were identified as significant components in the catalyst, making it a promising candidate for biodiesel synthesis. The optimal conditions for the synthesis process were determined using response surface methodology, resulting in a methyl ester content of 98.88%.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Environmental Sciences
Haider M. Zwain, Farah A. Al-Marzook, Basim K. Nile, Zuhair Mohammed Ali Jeddoa, Aqeel H. Atallah, Irvan Dahlan, Waqed Hammed Hassan
Summary: The study investigated the microbial diversity and morphology in a NABR digesting RPMW system, revealing that the microbial community composition and structure varied throughout the system with rich biofacies and diverse morphologies.
ARCHIVES OF ENVIRONMENTAL PROTECTION
(2021)
Article
Water Resources
Haider M. Zwain, Ahmed Samir Naje, Mohammadtaghi Vakili, Irvan Dahlan
Summary: The study demonstrates that temperature plays a significant role in the removal of COD and methane production during the anaerobic digestion process of recycled paper mill wastewater.
WATER PRACTICE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Haider M. Zwain, Kareem Radhi, Mohammadtaghi Vakili, Irvan Dahlan, Ahmed Samir
Summary: The study evaluated the water quality in Al-Najaf state, finding that both groundwater and surface water are classified as very high salinity and sodium water, unsuitable for irrigation.
JOURNAL OF ECOLOGICAL ENGINEERING
(2021)
Proceedings Paper
Green & Sustainable Science & Technology
Haider M. Zwain, Mohammadtaghi Vakili, Ahmed M. Faris, Irvan Dahlan
PROCEEDINGS OF AICCE'19: TRANSFORMING THE NATION FOR A SUSTAINABLE TOMORROW
(2020)