Article
Engineering, Environmental
N. Maniotis, K. Kalaitzidou, E. Asimoulas, K. Simeonidis
Summary: This study presents a continuous flow process for the complete recovery of magnetic nanoadsorbents in drinking water treatment. A rotary separation setup with permanent magnets was used, and magnetostatic analysis and computational fluid dynamics were employed to simulate the magnetic field and flow behavior of the magnetic nanocomposite dispersion. Critical parameters for maximizing capture and separation efficiency were identified, and a pilot unit was developed and tested, achieving total capture and purification of water contaminated with Cr(VI).
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Konstantinos Simeonidis, Kyriaki Kalaitzidou, Theopoula Asimakidou, Carlos Martinez-Boubeta, Antonios Makridis, Anita Haeussler, Georgios Vourlias, Lluis Balcells
Summary: A one-step solar vapor deposition method was used to develop tin oxide nanoparticles that can efficiently capture low concentrations of hexavalent chromium from water. The growth of SnO nanoparticles was aided by co-evaporating SnO2 and Fe powders at varying mass ratios, with a minimum requirement of 50% wt Fe to inhibit the formation of a passive SnO2 surface layer. Passivation-free SnO nanoparticles exhibited significant improvement in adsorption capacity, reaching 1.74 mg/g for the sample prepared with 50% wt Fe in the target.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xuying Guo, Zhiyong Hu, Xinle Gao, Yanrong Dong, Saiou Fu
Summary: In this study, fly ash-loaded nano-FeS composites were found to have good performance in the removal of Cr(VI) and total chromium, providing a possible solution for effective elimination of these toxic heavy metals.
Article
Engineering, Environmental
Mohd Hushni Mohd Yusof, Shamsul Sarip, Abdul Yasser Abd Fatah, Hazilah Mad Kaidi, Firdaus Muhammad-Sukki, Nor Fazilah Mohd Hashim
Summary: Access to safe drinking water is essential for human health. This study explores the potential of the in-situ stannous reagent generator (SRG) as a disruptive green technology for Cr (VI) treatment. The SRG technology efficiently and safely reduces Cr (VI) levels in drinking water, reducing health risks and chemical handling risks.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Sneha Damal Villivalam, Scott M. Ebert, Hee Woong Lim, Jinse Kim, Dongjoo You, Byung Chul Jung, Hector H. Palacios, Tabitha Tcheau, Christopher M. Adams, Sona Kang
Summary: Exercise can significantly increase the expression of DNMT3A in oxidative red muscle, playing a pivotal role in endurance exercise by controlling intracellular oxidative stress. Deficiency of DNMT3A leads to reduced tolerance to endurance exercise, which can be rescued by inhibiting the ALDH1L1 pathway.
Article
Biochemistry & Molecular Biology
Liga Wuri, Robert C. Burghardt, Joe A. Arosh, Charles R. Long, Sakhila K. Banu
Summary: Environmental and occupational exposure to hexavalent chromium, Cr(VI), leads to female reproductive failures and infertility. Cr(VI) is widely used and has detrimental effects on both male and female reproductive systems. The current study investigates the mechanism of Cr(VI) in causing meiotic disruption of MII oocytes, leading to oocyte incompetence in superovulated rats.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Ecology
Yan-Chao Shi, Yi-Ran Zhao, Ai-Zhong Zhang, Lei Zhao, Zhe Yu, Mu-Yang Li
Summary: This study investigated the toxic effects of waterborne Cr (VI) on Cyprinus carpio, focusing on hematology, digestive enzymes, redox state, and apoptosis. The results showed that exposure to Cr (VI) caused significant adverse effects on various parameters, including blood parameters, serum biochemistry, digestive enzymes, oxidative stress levels, and apoptosis pathways. The findings suggest that waterborne Cr (VI) exposure above 0.5 mg/L can have potential toxic effects on C. carpio.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Anfal Fedala, Ounassa Adjroud, Salwa Abid-Essefi, Rim Timoumi
Summary: Hexavalent chromium is an environmental pollutant and endocrine-disrupting metal. Selenium and zinc are essential trace elements that can mitigate potassium dichromate-induced thyrotoxicity in pregnant rats. However, the combined co-treatment of selenium and zinc showed less thyroprotective effects compared to individual treatment. Further investigations are needed to explore the synergetic interaction of selenium and zinc against hexavalent chromium toxicity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Yanbing Zhao, Huan Zhang, Dezheng Hao, Jinglu Wang, Ding Zhang, Zilong Sun, Ci Liu
Summary: Hexavalent chromium is a common environmental contaminant that induces oxidative damage and apoptosis in animal cells. Selenium has been found to alleviate the toxic effects of hexavalent chromium by acting as an antioxidant or chelating hexavalent chromium into biologically inert complexes. This study shows that selenium can ameliorate ileum damage and cecal microbial disturbances induced by hexavalent chromium.
BIOLOGICAL TRACE ELEMENT RESEARCH
(2022)
Article
Environmental Sciences
Kyriaki Kalaitzidou, Evangelia Chioti, Theopoula Asimakidou, Dimitrios Karfaridis, George Vourlias, Manassis Mitrakas, Konstantinos Simeonidis
Summary: The impact of hydroxyl excess on the synthesis of Fe3O4 nanoparticles and its potential for Cr(VI) uptake from polluted water were investigated. Results showed that near the zero-excess point or with negative excess values, Fe3O4 nanoparticles exhibited high efficiency for Cr(VI) removal.
Article
Environmental Sciences
Daniel Mahringer, Sami S. Zerelli, Aki S. Ruhl
Summary: This study investigated the effect of redox-active substances on the RCbF process and identified the potential risk of using MnO2 as a mediator to oxidize Cr(III) to Cr(VI). It was found that up to one third of the initial Cr(III) concentration could be oxidized to Cr(VI) within a short contact time. Mixing Cr(VI) containing raw water with Fe(II) containing groundwater was suggested as a chemical-free alternative for the RCbF process.
Article
Engineering, Environmental
T. Asimakidou, D. Karfaridis, K. Kalaitzidou, K. Simeonidis, K. Chrissafis
Summary: A new class of inorganic/biobased nanocomposites, based on Sn(II) oxy-hydroxides and biochar, has been developed for efficient removal of hexavalent chromium from drinking water. The nanocomposites exhibit good adsorption performance with a significantly increased adsorption capacity compared to pure Sn oxy-hydroxide adsorbents. This approach offers a low-cost and sustainable method for the production of Cr(VI) adsorbents.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Yuan Liu, Yanlun Qiu, Qi Yin, Xinglong Li, Qunhua Bai, Yingli Li, Hong Xiao
Summary: The study investigated the mechanisms of Cr(VI) tolerance and reduction in the wild strain CM01 and its response to environmental pollution pressure at the molecular level. The iTRAQ technique identified differentially expressed proteins in domesticated CM01 related to Cr(VI) resistance. These findings were confirmed by RT-qPCR, showing consistency in gene expression levels. Additionally, domesticated CM01 displayed increased hydrophobicity, self-aggregation, glucose content, and SOD activity in response to Cr(VI) treatment.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Biochemistry & Molecular Biology
Pei-Chi Chiang, Pei-Tzu Li, Ming-Jen Lee, Chin-Tin Chen
Summary: This study demonstrates that the reduced cellular invasion induced by photodynamic therapy (PDT) is associated with CLIC4 expression suppression through increased DNMT1 expression and promoter hypermethylation, involving the tumor suppressor p53. The findings further support that the regulation of CLIC4 expression in tumorigenesis is mediated by DNMT1-mediated hypermethylation and depends on the status of p53.
Article
Biochemistry & Molecular Biology
Shengxiang Luo, Cong Zhang, Zeyun Gao, Liping Jiang, Qiujuan Li, Xiaoxia Shi, Ying Kong, Jun Cao
Summary: This study revealed that hexavalent chromium (Cr (VI)) induces aerobic glycolysis and reduces oxidative phosphorylation (OXPHOS) by increasing the expression of glycolytic enzymes and decreasing mitochondrial mass. It was found that endoplasmic reticulum (ER) stress and activating transcription factor 4 (ATF4) mediate the glycolytic shift and the inhibition of OXPHOS caused by Cr (VI). The interaction between high mobility group A2 (HMGA2) and ATF4, enhanced by ER stress, plays a crucial role in Cr (VI)-mediated metabolic alterations. In vivo experiments confirmed the involvement of HMGA2 in regulating ATF4, glycolysis, and OXPHOS.
CHEMICO-BIOLOGICAL INTERACTIONS
(2023)