Article
Engineering, Environmental
Qingdong Qin, Yongfeng Zhang, Hanmin Zhang, Xuchun Li, Yazi Liu
Summary: This study utilized potassium permanganate (KMnO4) to simultaneously remove tetracycline (TTC) and Cu(II) from water. The removal efficiency of TTC and Cu(II) was 92.8% and 78.5%, respectively, after 30 minutes of reaction under pH 6.0 and 50 μM of KMnO4. The factors affecting the simultaneous removal of TTC and Cu(II), such as initial concentrations, KMnO4 dose, solution pH, temperature, and water matrix, were comprehensively evaluated. Increasing the KMnO4 dose and reaction temperature improved the removal efficiency. This work provides a cost-effective approach for the simultaneous removal of TTC and Cu(II) from water.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Han Ding, Jiangyong Hu
Summary: This study investigated the formation of bromate and brominated oxidation byproducts (Br-OBPs) by the UVA/TiO2/peroxydisulfate (PDS) process in the presence of bromide. It was found that the PDS concentration and TiO2 dosage were positively correlated with bromate formation, while the conversion of bromide to bromate was inhibited by the initial concentration of bromide itself. Extreme pH, humic acid, or ammonium completely inhibited the formation of bromate, while chloride, sulfate, and bicarbonate could suppress bromate formation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Polymer Science
Hisao Hori, Jin Hamaura
Summary: The copolymer of ethylene and tetrafluoroethylene (ETFE) can efficiently decompose into F- and CO2 when treated with KMnO4 in superheated water, reducing the reaction temperature by 60 degrees Celsius compared to using supercritical water. Additionally, ETFE requires higher temperature for mineralization compared to its isomer poly(vinylidene fluoride) (PVDF).
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Engineering, Environmental
Sining Wu, Kaiheng Guo, Ruijie Xie, Shaoxiong He, Wenrui Wei, Jingyun Fang
Summary: This study shows that MnO2 enhances the degradation of Mn(VII)-inert micropollutants, acting as a catalyst for oxidation reactions and its effectiveness depends on pH.
Article
Engineering, Environmental
Hisao Hori, Tomoki Ushio, Takuma Asai, Ryo Honma, Nadim Eid, Bruno Ameduri
Summary: The mineralization of a fluorotelomer surfactant in hot water was studied, and by optimizing conditions such as temperature and the presence of various chemicals, it was found that a combination of KMnO4 and O-2 efficiently decomposed the surfactant into F-, SO42-, and CO2. Minor products of perfluoroalkanes were detected in the gas phase, with majority and minor products accounting for high percentages of initial materials. The in situ formed MnO2 played a dominant role in the oxidation of the surfactant.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Analytical
Madhvi Garg, Dhiraj Sud
Summary: A water-soluble azo functionalized oligomeric chitosan reagent (beta-NAC) has been developed for the visual detection and quantification of KMnO4. The beta-NAC sensor also shows potential for detecting metal ions and anions spectrophotometrically and spectrofluorometrically. Various analyses were conducted to characterize the synthesized reagent, and the results confirmed its high selectivity and stability in KMnO4 detection.
Article
Acoustics
JuanJuan Wang, Yuting Wang, Wenshu. Li, Xiaoge Wu
Summary: 1000 kHz high-frequency ultrasound at 0.12 and 0.39 W/mL intensity was used to enhance the inactivation of Microcystis aeruginosa cells using KMnO4. Ultrasound at 0.12 W/mL intensity was effective in inactivating the cyanobacteria within 10 min with 10 mg/L of KMnO4. The Weibull model provided a good description of the inactivation, showing that some cells have resistance to the treatment. Cytometry and microscopic analysis confirmed cell damage, while the extracellular organic matter and cyanobacterial toxins were not significantly increased and even decreased. The inactivated cyanobacteria suspension did not hinder the germination of mung beans, suggesting a new idea for using cyanobacteria-laden wastewater. These findings provide new insights into the biological effects of ultrasound.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Engineering, Environmental
Chad Verwold, Alejandro Ortega-Hernandez, Jillian Murakami, Laura Patterson-Fortin, Jenny Boutros, Richard Smith, Susana Y. Kimura
Summary: A novel electrochemical Advanced Oxidation System (AOS) has been developed for water disinfection using iodide to generate active iodine species in-situ. The presence of iodide can lead to the formation of iodinated disinfection byproducts (I-DBPs), which have been shown to be more toxic than chlorinated and brominated analogs. The study found that AOS treatment formed low levels of iodinated DBPs in water sources, comparable to levels found in disinfected drinking water and wastewater.
Review
Engineering, Environmental
Juan Li, Su-Yan Pang, Zhen Wang, Qin Guo, Jiebin Duan, Shaofang Sun, Lihong Wang, Ying Cao, Jin Jiang
Summary: This study summarizes the latest research findings on Mn(VII) reactions with a wide range of EOCs, detailing aspects of reaction kinetics, oxidation products, toxicity changes, and emphasizes the impacts of intermediate manganese products. The research highlights the significant roles of manganese products in Mn(VII) oxidation processes, advancing understanding in water treatment applications.
Article
Engineering, Environmental
Ruixue Guo, Shengnan Zhang, Xuejing Xiao, Yeping Liang, Zunyao Wang, Ruijuan Qu
Summary: This study investigates the activation of photocoupled permanganate (PM) by infrared light and its enhanced oxidation efficiency. The results show that infrared light can effectively activate PM and increase the degradation rate of organic pollutants. The use of infrared coupled PM system in water treatment shows excellent degradation performance, especially in natural waters.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yeping Liang, Mingzhu Liu, Chenxi Sun, Xiaosheng Tang, Ahmed A. Allam, Jamaan S. Ajarem, Saleh Maodaa, Zunyao Wang, Ruijuan Qu
Summary: In this study, we investigated the oxidation process of 4-tert-butylphenol (4-tBP) by potassium permanganate (KMnO4). The results showed that KMnO4 can efficiently degrade 4-tBP with a removal efficiency of over 93%. The degradation process produced non-toxic byproducts, making it a safe and promising technology.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Spectroscopy
Najat O. A. Al-Salahi, Elham Y. Hashem, Doaa A. Abdel-Kader
Summary: Two highly simple, economical, accurate and sensitive spectrophotometric methods for determination of dopamine hydrochloride (DAH) in either pure form and pharmaceutical formulations were described, known as method A and method B. Both methods were successfully applied for the determination of dopamine hydrochloride in pharmaceutical samples under optimized conditions.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Engineering, Chemical
Sean T. McBeath, Nigel J. D. Graham
Summary: A novel process involving simultaneous electrochemical oxidation and electrosynthesis of permanganate oxidant was explored for treatment of triazine herbicide atrazine. Permanganate synthesis was largely unaffected by the operating current density, and hydroxyl radical mediated oxidation was observed to degrade atrazine with or without enhanced oxidation by permanganate generation. This process yielded second-order reaction rate constants for atrazine degradation with electrochemically generated permanganate and dosed potassium permanganate.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Environmental Sciences
Lu Wang, Yaqun Yu, Guoqiang Liu, Junhe Lu
Summary: This study investigated the degradation of Tetrabromobisphenol S (TBBPS) in the presence of Co2+ activated peroxymonosulfate (PMS), and examined the formation of brominated by-products. It was found that TBBPS can be effectively removed, but leads to the formation of brominated by-products. The presence of natural organic matter inhibits the transformation of TBBPS.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Zhechao Hua, Jieying Liang, Ding Wang, Zhihong Zhou, Jingyun Fang
Summary: This study provides new insights into the mechanisms of transforming aliphatic amines and forming nitro products using the UV/chlorine process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)