Article
Environmental Sciences
Chenyuan Pan, Feng Zhu, Minghong Wu, Lihui Jiang, Xiaoyu Zhao, Ming Yang
Summary: The study investigated the toxicity of Fluoxetine (FLU) and its transformed products formed during UV photolysis using zebrafish embryos as a model. Exposure to UV-irradiated solutions led to delayed hatching time, increased heart rate, and decreased body length of the zebrafish embryos, along with changes in enzyme activity and gene expression levels. The research highlights the importance of considering the formation and persistence of toxic transformation products in aquatic environments.
Article
Environmental Sciences
Yu Duan, Wei Zhou, Haiyang Shao, Zhibo Zhang, Wenyan Shi, Gang Xu
Summary: In this study, electron beam irradiation was used to degrade indomethacin (IDM) in aqueous solution, and the main degradation pathways of IDM were found to be under the actions of oxidative and reductive radicals. The degradation effect was influenced by the presence of NO3-, NO2-, CO32-, HCO3-, SO2-, and humic acid.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Pengfei Zhao, Qingfu Ye, Yaoying Zheng, Joann K. Whalen, Sufen Zhang, Wei Wang
Summary: This study investigates the degradation of BDE-209 in rice-vegetable rotation soils induced by electron beam irradiation, showing higher efficiency in non-flooded conditions. The main degradation mechanism identified is debromination.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Analytical
Qi Zou, Zhuhao Huo, Haiyang Shao, Jianzhong Gu, Gang Xu
Summary: This study investigated the degradation of PZA by EBI, achieving a 99% removal rate for 0.2 mM PZA under 5 kGy. Various anions and fulvic acid were found to inhibit the degradation, while the addition of H2O2 or K2S2O8 enhanced the process. Quantum chemical calculations identified (OH)-O-center dot as the primary reactive species in the degradation process.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Chemistry, Analytical
Caishan Jiao, Xiusen Men, Zhigang Li, Meng Zhang, Yang Gao, Jiancong Liu, Yaorui Li, Hongtao Zhao
Summary: This study investigates the degradation of surfactants including PFOS, LAS, and CTAB under electron beam irradiation, finding that high absorbed dose and pH value promote the degradation of surfactants, with e(aq)(-) playing a dominant role in breaking C-C bonds. Experimental results support that the degradation of surfactants follows pseudo-first-order kinetics.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Polymer Science
L. M. Valencia, M. de la Mata, M. Herrera, F. J. Delgado, J. Hernandez-Saz, S. Molina
Summary: (S)TEM has valuable applications in materials science, but electron beam induced damage is a challenge for soft materials like acrylic resins. This study explores different methodologies for obtaining suitable resin specimens for (S)TEM analysis and investigates the mechanisms of electron beam induced degradation in acrylic resin and the critical doses involved.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Biotechnology & Applied Microbiology
Thalita Tieko Silva, Fernanda Rios Jacinavicius, Ernani Pinto, Sueli Ivone Borrely
Summary: Electron beam irradiation (EBI) at doses between 1 and 10 kGy affects intracellular and extracellular microcystin variants, with doses over 2 kGy being lethal to M. aeruginosa even at 48 h post-irradiation. Exposure to 2-5 kGy doses decreases pH values. Low doses of EBI are suitable for the control of toxic cyanobacteria in water treatment processes.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2023)
Article
Polymer Science
Elena Manaila, Gabriela Craciun, Daniel Ighigeanu, Ion Bogdan Lungu, Marius Dumitru, Maria Daniela Stelescu
Summary: Polymeric composites based on NR and PS were irradiated with electron beam to investigate their degradation. PS loading and irradiation dose were found to be responsible for the degradation, with chain scission dominant at a dose of 450 kGy.
Article
Environmental Sciences
Haiyang Shao, Yingfei Ren, Chen Lei, Gang Xu
Summary: This paper used electron beam irradiation to efficiently degrade the cardiovascular drug salbutamol (SAL) and proposed possible degradation pathways. The results showed that 100 mg/L of SAL could be almost completely removed (95.1%) at 10 kGy, and the degradation kinetics followed a pseudo first-order model. Factors such as pH, inorganic ions, and water matrix had varying effects on the degradation of SAL due to their influence on the formation of reactive species in the solution.
Article
Agronomy
Ratchagon Pongsri, Sukanya Aiamla-or, Varit Srilaong, Apiradee Uthairatanakij, Pongphen Jitareerat
Summary: The study showed that 1 kGy of electron-beam irradiation delayed the color change of lime peel, while increasing respiration rate and weight loss. However, 10% shellac coating applied before irradiation could minimize respiration rate and water loss. The combined treatment maintained chlorophyll content and suppressed enzyme activity, but affected titratable acidity and increased levels of total ascorbic acid and hydrogen peroxide.
POSTHARVEST BIOLOGY AND TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Guanhong Chang, Zonghong Luo, Yao Zhang, Xu Xu, Ting Zhou, Xin Wang
Summary: The purpose of this study was to evaluate the mechanism of sterilization of Staphylococcus aureus by electron beam irradiation and whether it reduces the toxicity of its fermentation supernatant. The results showed that 2 kGy of electron beam irradiation treatment completely inactivated S. aureus in suspension culture, and 4 kGy inactivated cells in S. aureus biofilms. The combined results of hemolytic, cytotoxic, and suckling mouse wound models demonstrated that the toxicity of S. aureus metabolites was significantly reduced when the electron beam irradiation dose was 4 kGy.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Chemistry, Physical
Elena Manaila, Gabriela Craciun, Ion Bogdan Lungu, Marius Daniel Dumitru Grivei, Maria Daniela Stelescu
Summary: This study investigated the degradation of composites based on natural rubber and plasticized starch using four types of vulcanization accelerators and electron beam irradiation. The results showed that the mixtures became sensitive at irradiation doses of 300 kGy and 450 kGy, and the consequences of the degradation processes were discussed.
Article
Environmental Sciences
Feng Zhu, Jiali Pan, Qi Zou, Minghong Wu, Hongyong Wang, Gang Xu
Summary: This study investigated the degradation process and mechanism of sulfonamide antibiotics by electron-beam irradiation, showing that the removal efficiency was achieved with further mineralization. Environmental factors such as pH and O2 atmosphere were found to enhance the removal of sulfonamides, with hydroxyl radicals playing a dominant role in the degradation process. Toxicity experiments further indicated a significant decrease in toxicity of sulfonamide antibiotics after degradation.
Article
Biochemistry & Molecular Biology
Elena Manaila, Gabriela Craciun, Daniel Ighigeanu, Ion Bogdan Lungu, Marius Daniel Dumitru Grivei, Maria Daniela Stelescu
Summary: This study investigates the degradation of natural rubber-based composites through irradiation. The results reveal that increasing the radiation dose leads to the formation of specific degradation compounds and significant changes in the structure and mechanical properties of the composites.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Thais Couasnon, Birk Fritsch, Michael P. M. Jank, Roberts Blukis, Andreas Hutzler, Liane G. G. Benning
Summary: Liquid-Phase Transmission Electron Microscopy (LP-TEM) allows for in situ observations of materials in liquids with high resolution. The irradiation in LP-TEM alters the chemistry of the aqueous solution, affecting the observed reactions. By using goethite's morphological changes as a marker, the influence of radiation on solution chemistry is evaluated. The results provide insights into the interplay between redox reactions and acidity during radiation-induced chemical changes in LP-TEM, opening up new perspectives in studying dissolution processes in various settings.
Article
Environmental Sciences
R. F. Nunes, F. K. Tominaga, S. Borrely, A. C. S. C. Teixeira
Summary: This study investigated the efficiency of UV/persulfate technology for removing nonionic surfactants and analyzed the effects of persulfate concentration and photon emission rate on the degradation process. The results showed that UV/persulfate was highly effective in removing nonionic surfactants, and UVA radiation was suitable for treating wastewater containing these pollutants.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Priscila Hasse Palharim, Arlen Mabel Lastre-Acosta, Jose Carlos Mierzwa, Antonio Carlos Silva Costa Teixeira
Summary: This study evaluated the degradation of MeP and PrP in synthetic wastewater using a membrane bioreactor (MBR) and found that biodegradation was the main removal mechanism of parabens in the system. The MBR showed good organic matter removal efficiency and was not significantly affected by the addition of parabens at low or high dosages. High concentrations of parabens did not negatively impact the control of suspended solids.
SEPARATION SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Roberta Frinhani Nunes, Antonio Carlos Silva Costa Teixeira
Summary: Surfactants are organic molecules that reduce interfacial energy and increase solubility of pollutants in water. They have various applications in domestic and industrial settings, but their increased use and improper disposal pose concerns for the environment. This study provides an overview of surfactant types, their presence in different water matrices, and regulations on their concentration limits. It also highlights a potential treatment method – persulfate-based processes – for surfactant degradation.
Article
Engineering, Chemical
Priscila Hasse Palharim, Maria Clara D'Amaro Caira, Carolina de Araujo Gusmao, Bruno Ramos, Gabriel Trindade dos Santos, Orlando Rodrigues Jr, Antonio Carlos Silva Costa Teixeira
Summary: Heterogeneous photocatalysis, especially using composite materials, shows great potential in efficient water and wastewater treatment. In this study, WO3-AgCl composites were synthesized through a simple hydrothermal method, and the effects of reaction temperature and synthesis time on the composite were investigated. The materials exhibited broad-spectrum activity, with strong absorption in the UV region and some absorption in the visible region. The morphology of the materials was greatly influenced by the synthesis conditions, which in turn affected the photocatalytic efficiency. The composites showed good photocatalytic activity, with significant acetaminophen removal under simulated sunlight. The stability tests also demonstrated the promising stability of the composites. The hetero-junction formed between AgCl and WO3 played a crucial role in the photocatalytic activity.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Chemical
Carolina de Araujo Gusmao, Leonardo Almeida Diniz, Bruno Ramos, Alan Gomes Camara, Jose Geraldo A. Pacheco, Antonio Carlos Silva Costa Teixeira
Summary: The investigation on TiO2/SiO2 catalysts revealed that the presence of silica significantly enhanced the properties of the catalyst, improving its photocatalytic activity for removing volatile organic compounds in gas-solid photoreactors. This study also showed that a 20%-TiO2 material calcined at 450 degrees C exhibited the best performance among 14 different materials, withstanding continuous photoreaction for 20 hours.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Environmental
Larissa Pinheiro de Souza, Flavio Sanches-Neto, Giberto Mitsuyoshi Yuki Junior, Bruno Ramos, Arlen Mabel Lastre-Acosta, Valter Henrique Carvalho-Silva, Antonio Carlos Silva Costa Teixeira
Summary: The photochemical behavior of venlafaxine in surface water was investigated using a hybrid theoretical-experimental-kinetic modeling approach. The rate constants of VNX reactions with reactive photo-induced species were measured, and possible degradation products were predicted. Kinetic simulations of VNX persistence in an urban water reservoir were performed. The results suggest low direct photolysis of VNX and potential toxicity of its metabolite, O-desmethylvenlafaxine. The estimated half-lives of VNX range from 9 to 62 days.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Caroline Pereira Katsumata, Marcela Prado Silva Parizi, Arlen Mabel Lastre-Acosta, Antonio Carlos Silva Costa Teixeira
Summary: UV photolysis can efficiently remove some pharmaceutically active compounds, but the effectiveness is lower in mixed solutions, and the treatment of residual toxicity should be considered.
Article
Environmental Sciences
Syed Sikandar Shah, Bruno Ramos, Antonio Carlos Silva Costa Teixeira
Summary: In this study, a composite hydrogel was successfully synthesized for the deep removal of methylene blue dye by incorporating activated charcoal. The experiment demonstrated that the synthesized hydrogel exhibited good adsorption activity and selectivity, making it effective for wastewater treatment.
Article
Energy & Fuels
Ashish V. Mohod, Danilo B. Clemente, Natalia Klanovicz, Paulo F. Moreira, Manisha V. Bagal, Antonio Carlos S. C. Teixeira, Reinaldo Giudici
Summary: This research focuses on cavitation-based methods using external oxidants to degrade Rhodamine 6G aqueous solution. Reactor performance was evaluated through adsorption studies, hydrogen peroxide detection, fluid velocity, and glass-marble size. The combined impact of two additives was also tested for process intensification. The study shows that glass-marble packed bed reactor-based cavitation treatment is effective for Rh 6G degradation and has potential for industrial wastewater treatment.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Environmental
Bruna Castanheira, Sergio Brochsztain, Larissa Otubo, Antonio Carlos S. C. Teixeira
Summary: In this study, PMONDI was used as a photocatalyst for the efficient degradation of antibiotics. Compared to traditional TiO2/SBA-15, PMONDI showed improved performance in terms of photodegradation and reusability. Analysis of the degradation products revealed two main pathways. Therefore, PMONDI materials have great potential as photocatalysts for the degradation of CECs and should be further explored.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Juliana Mendonca Silva De Jesus, Allan dos Santos Argolo, Flavio Kiyoshi Tominaga, Maria Elena Taqueda, Daniele Maia Bila, Sueli Ivone Borrely, Antonio Carlos Silva Costa Teixeira
Summary: The degradation of levonorgestrel (LNG) and gestodene (GES) through an anodic oxidation process mediated by active chlorine species was investigated. The independent variables [LNG](0) and [GES](0), current density, and [NaCl](0) were optimized using a response surface methodology. The degradation process was followed and optimized, and real pharmaceutical wastewater confirmed the model optimization. The electrochemical process not only decreased estrogenic activity but also increased acute toxicity.
Article
Environmental Sciences
Bruno Ramos, Wesley F. Vaz, Luan F. Diniz, Flavio O. Sanches Neto, Julio C. O. Ribeiro, Valter H. Carvalho-Silva, Antonio Carlos S. C. Teixeira, Caue Ribeiro, Hamilton B. Napolitano, Paulo S. Carvalho Jr
Summary: The excessive use of pesticides and the demand for environmentally friendly compounds have driven detailed studies on the environmental fate of these compounds. In this study, the mechanism of acid hydrolysis of the herbicide ametryn (AMT) was investigated, and the toxicities of its metabolites were predicted through experimental and theoretical approaches. The hydrolysis of AMT under acidic conditions resulted in the formation of hydroxyatrazine (HA) as the main product. The tautomerization reactions favored the conversion of AMT to HA. The kinetics of the reaction revealed that the dissociation of CH3SH was the rate-controlling step in the degradation process, leading to a half-life of 7 to 24 months under typical acid soil conditions.
Review
Environmental Sciences
F. Machado, A. C. S. C. Teixeira, L. A. M. Ruotolo
Summary: Water pollution is a major problem that needs to be addressed in the twenty-first century. Conventional effluent treatment processes often fail to completely remove recalcitrant chemical components, making the issue even more challenging. Advanced oxidative processes, such as the Fenton and photo-Fenton processes, have gained attention for their simplicity and potential as a solution. This review critically analyzes the feasibility of scaling up these processes and provides insights into process parameters, reactor designs, and challenges. It also presents examples of applications and discusses current trends and future perspectives to aid researchers in the field.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Bruno Ramos, Livia Babetto Ferreira, Priscila Hasse Palharim, Patricia Metolina, Carolina de Araujo Gusma, Antonio Carlos Silva Costa Teixeira
Summary: The demand for sustainable and feasible water treatment technologies is increasing due to the recognition of the environmental damage caused by indiscriminate wastewater disposal. Solar-driven processes are essential for the economic feasibility of water treatment technologies. This paper presents the development of a photo-Fenton-like system using the persulfate ion and solar irradiation for continuous processes, which achieved a removal efficiency of 94% under optimal conditions.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(2023)
Article
Biochemistry & Molecular Biology
Patricia Metolina, Lilian Gomes de Oliveira, Bruno Ramos, Yan de Souza Angelo, Paola Minoprio, Antonio Carlos Silva Costa Teixeira
Summary: This study investigated the effectiveness of UV-C decontamination on masks and respirators containing a high viral load of SARS-CoV-2. The results showed that UV-C exposure could significantly reduce the viral load in masks, with over 95% reduction achieved in filtering facepiece respirators (FFR) N95 and surgical masks, and a similar reduction in fabric masks. However, a higher UV-C dose was required for the elastic strap of N95 respirators. These findings suggest that UV-C decontamination can be an effective and safe strategy for complete disinfection of masks.
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
(2022)