Article
Environmental Sciences
Chongqing Wang, Ruirui Sun, Rong Huang, Yijun Cao
Summary: This study enhances the catalytic efficiency of pyrite by pre-reaction with hydrogen peroxide to degrade recalcitrant contaminants. By optimizing factors such as pre-reaction time, hydrogen peroxide concentration, solution pH, and dye concentration, efficient degradation of contaminants using natural pyrite was achieved. Enhanced dye degradation was attributed to the production of hydroxyl radicals facilitated by self-regulation of pH, Fe2+ release, and Fe2+/Fe3+ cycle.
Review
Chemistry, Multidisciplinary
Zining Wang, Mingyue Liu, Fan Xiao, Georgeta Postole, Hongying Zhao, Guohua Zhao
Summary: Electrochemical advanced oxidation processes (EAOPs), particularly the heterogeneous electro-Fenton (EF) process, with in-situ formation of hydrogen peroxide (H2O2), have shown great potential for the effective and environmentally friendly treatment of refractory organic pollutants. This article discusses the surface catalytic mechanisms for H2O2 activation in the heterogeneous EF process and summarizes the required features for H2O2 formation via selective oxygen reduction reaction (ORR) with carbonaceous electrodes. It also provides an overview of solid Fenton catalysts and integrated functional cathodes used in heterogeneous EF for wastewater treatment, along with a brief discussion on their catalytic activity and stability under different experimental conditions. Additionally, the application of heterogeneous EF process in the remediation of emerging contaminants is highlighted, while emphasizing the challenges and future prospects related to catalytic fall-off and multi-step/complex techniques for water purification.
CHINESE CHEMICAL LETTERS
(2022)
Article
Engineering, Chemical
Wanjia Zhang, Xu Jiang, John Ralston, Jian Cao, Xin Jin, Wei Sun, Zhiyong Gao
Summary: Eosin Y, a commonly used dye for cotton and silk, is highly toxic and difficult to degrade. Around 20% of it becomes organic dye wastewater during the printing and dyeing process, posing serious harm to the environment and human health. In this study, naturally oxidized pyrite was chosen as a promising photocatalyst to degrade Eosin Y, achieving over 90% degradation under specific conditions.
MINERALS ENGINEERING
(2023)
Article
Engineering, Environmental
Kaiyun He, Xinchun Guo, Guofeng Wang, Jiaping Xiong, Huiling Peng, Faying Lai, Jinbao He
Summary: This experiment investigated the use of natural pyrite as a catalyst for the electro-Fenton process to treat wastewater with high concentrations of chlorine salts from a pesticide factory. The results showed that using 3 g/L pyrite as catalyst, with graphite cathode and Ti/RuO2-IrO2-SnO2 anode, under optimized conditions, a high treatment efficiency was achieved after 3 hours of treatment. The electro-Fenton process catalyzed by natural pyrite exhibited good potential for efficiently treating pesticide processing plant wastewater with high contents of chlorine salts.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Iremsu Kayan, Nilgun Ayman Oz, Cetin Kantar
Summary: The aerobic biodegradation combined with pyrite-Fenton process was found effective in treating wastewater containing various chlorophenols by reducing toxicity and improving COD removal efficiency. The type of chlorophenol treated greatly influenced the biodegradation process, with highly chlorinated CPs such as 2,4,6-TCP showing the highest toxicity. Sludge acclimation and pyrite-Fenton pre-treatment enhanced the biomass tolerance to CP toxicity and improved sCOD removal efficiencies, showcasing the potential of this combined system for effective treatment of chlorophenol-containing wastewater.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Quanyuan Chen, Yuan Yao, Zheying Zhao, Juan Zhou, Zhao Chen
Summary: This study investigated the efficacy of pyrite catalyzed Fenton-like oxidation for tertiary treatment of dyeing wastewater and emphasized the importance of its long-term catalytic activity. The results showed that pyrite can effectively catalyze the oxidation of recalcitrant pollutants in suitable conditions, with its heterogeneous catalysis by Fe(II) on the surface being more significant than Homogeneous catalysis by dissolved iron ions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Gabriela Lama, Jessica Meijide, Angeles Sanroman, Marta Pazos
Summary: Water pollution is a serious global environmental issue, with emerging pollutants posing risks to human and animal health. Advanced oxidation processes have been proposed as an effective technology for removing these pollutants. Recent research focuses on the use of different types of heterogeneous catalysts to overcome limitations of conventional treatment methods.
Article
Geochemistry & Geophysics
Xiang Gong, Suqi Li, Jiaqiao Yuan, Zhan Ding, Anmei Yu, Shuming Wen, Shaojun Bai
Summary: Efficient treatment of mineral-processing wastewater is a subject of great interest in recent times. This study aimed to degrade xanthate from flotation tailings wastewater using a pyrite-catalyzed Fenton system. The method achieved a sodium butyl xanthate (SBX) removal rate of over 96%, outperforming the H2O2 system by 12.85% under optimal conditions. Natural pyrite acted as a catalyst to enhance the oxidation capacity of H2O2, with hydroxyl radicals (center dot OH) identified as the main active species. The reaction mechanism proposed involves the adsorption of H2O2 onto pyrite surfaces, reaction with Fe2+, formation of center dot OH and Fe3+, and oxidation of SBX to smaller products.
Article
Green & Sustainable Science & Technology
Fan Sang, Zhuo Yin, Wenjun Wang, Eydhah Almatrafi, Yuwen Wang, Beichen Zhao, Jilai Gong, Chengyun Zhou, Chen Zhang, Guangming Zeng, Biao Song
Summary: The increased use of antibiotics and the discharge of antibiotic wastewater have caused severe pollution. In this study, a novel catalyst derived from low-cost materials was prepared for the degradation of ciprofloxacin. The catalyst showed excellent performance in degrading ciprofloxacin and had minimal impact from common anions in water. This work provides a valuable solution for waste elimination and pollution reduction through the utilization of solid waste resources.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Mahdieh Raji, Mohammad Nazeri Tahroudi, Fei Ye, Joydeep Dutta
Summary: This study applied RSM and ACO-SVR models to predict optimal parameters in the heterogeneous Fenton oxidation of melanoidin, showcasing the effectiveness of ACC-CH-nZVI as a catalyst and the relative superiority of the ACO-SVR model in prediction capability.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Eva Domingues, Joao Lincho, Maria J. Fernandes, Joao Gomes, Rui C. Martins
Summary: Untreated swine wastewater can have serious consequences on water quality, but physical-chemical processes can effectively improve its quality. This study evaluated the performance of four low-cost materials and found that some of them showed promising results in removing COD. Additionally, the combination of adsorption and Fenton's process yielded interesting outcomes.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Beichen Zhao, Jilai Gong, Biao Song, Fan Sang, Chengyun Zhou, Chen Zhang, Weicheng Cao, Qiuya Niu, Zengping Chen
Summary: This study investigated the effects of different carbon materials on the pyrite-catalyzed Fenton oxidation of ciprofloxacin. The results showed that all three carbon materials accelerated the Fenton oxidation reaction. Activated carbon (AC) had a higher adsorption capacity for ciprofloxacin, which enhanced the pyrite-catalyzed Fenton oxidation. The addition of carbon materials promoted the production of hydroxyl radicals, favoring the degradation of ciprofloxacin.
Article
Engineering, Environmental
Chao Li, Yuanfei Mei, Gaoxiang Qi, Wei Xu, Yueming Zhou, Yu Shen
Summary: The present study focused on the treatment of simulated chemical pharmaceutical wastewater using the Fenton oxidation process. The effects of operational parameters on the degradation efficiency of pollutants and biodegradability of the wastewater were investigated, and the results showed that the removal processes followed a second-order kinetic model. Quantum chemical analysis revealed a significant correlation between total energy and removal kinetic constant, indicating that higher total energy of organics made them more difficult to be removed. These findings are important for predicting the treatment efficiency of pollutants in real pharmaceutical wastewater.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Aref Shokri, Bahram Nasernejad, Mahdi Sanavi Fard
Summary: The efficiency of heterogeneous electro-Fenton technology in degrading recalcitrant organic pollutants in wastewater is highly evident. This green technology has gained significant attention from wastewater treatment research communities due to its outstanding performance, eco-friendliness, and wide operability. The article discusses the mechanism of the electro-Fenton process, the properties of efficient catalysts, and the challenges hindering its commercialization. It proposes future research directions and concludes that addressing those gaps will make the commercialization of electro-Fenton technology a realistic goal.
WATER AIR AND SOIL POLLUTION
(2023)
Review
Environmental Sciences
Juan Casado
Summary: Advanced oxidation processes (AOPs) such as Fenton's reagent have drawbacks, but Electro-Fenton (EF) and heterogeneous Electro-Fenton (HEF) using mineral catalysts have gained attention. Mineral catalysts have advantages in efficiency, stability, affordability, and environmental friendliness, but challenges include agglomeration of nanoparticles and complex preparation techniques. The optimal pH range and dosage of catalysts and the performance of different catalysts are discussed. Further development is needed, considering the environmental impact. The article also emphasizes the need to achieve environmentally friendly and cost-effective results using real wastewaters on a pilot scale.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)