Article
Chemistry, Analytical
Gabriel Zeplin, Eduardo G. C. Neiva
Summary: Different binary and ternary nanocomposites were synthesized among graphene oxide, manganese dioxide nanoparticles, and polyaniline using KMnO4 as an oxidizing agent and precursor for MnO2. The ratio of constituents depended on HCl concentration and aniline amount. The nanocomposites with higher MnO2 proportion showed the best performance as supercapacitors and electrochemical sensors, reaching capacitances of up to 150 F g(-1) and low detection limits for H2O2.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Leila Lamiri, Assia Tounsi, Djamel Eddine Hamza, Radhia Yekhlef, Mouhamed Ridha Khelladi, M. Saeed Akhtar, Ouafia Belgherbi, Samah Boudour, Farid Habelhames, Noureddine Boumaza, Naima Maouche, Belkacem Nessark
Summary: In this study, silver nanoparticles decorated manganese dioxide material was successfully synthesized and characterized. The results showed that the material exhibited a homogeneous fern-like microstructure and excellent performance in the reaction of hydrogen peroxide in alkaline medium, making it a promising cathode for fuel cells.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Polymer Science
Juan Huang, Kejia Wu, Hui Bai, Huabo Huang, Xiaoqing Zhang, Yanbo Liu, Chuanxi Xiong
Summary: The study constructed PANI/MnO2 composite material by adding manganese sulfate, which showed higher specific capacitance than bare PANI and demonstrated superior charge transfer behavior. In kinetic analysis, both capacitive and diffusion-controlled behaviors were found to contribute to the electrochemical performance.
Article
Environmental Sciences
Na Guo, Ruochun Zhang, Jingchen Li, Zhihan Sun, Teng Fei, Peizhe Sun
Summary: In this study, the influence of various environmental conditions on the performance of MnO2-H2O2 process was investigated. The results showed that the degradation of H2O2 was affected by ionic strength, pH, specific anions and cations, dissolved organic matter (DOM), and SiO2. The presence of low pH and phosphate inhibited the reaction, while DOM had a slight inhibitory effect. The study also found that HCO3- inhibited the reaction at low concentrations but promoted H2O2 decomposition at high concentrations.
Article
Engineering, Environmental
Huijin Li, Zhuodi Yuan, Shuang Ding, Jie Yuan
Summary: Magnetic biochar (MBC) is widely used for contaminant removal due to its ease of recovery and separation. However, magnetic modification decreases the surface area of biochar, resulting in limited improvement in adsorption performance. This study investigated the changes in physicochemical characteristics of modified MBC and evaluated its ability to remove Pb2+ from contaminated water. Ball milling modification greatly enhanced the adsorption performance of MBC by increasing the number and surface area of functional groups.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Yunzhu Chen, Hongjuan Sun, Tongjiang Peng, Tongxi Gao, Wenjin Ding, Tao Hui, Lei Jiang
Summary: This study utilized the catalytic effect of manganese dioxide on hydrogen peroxide to improve the swelling efficiency of vermiculite. Through characterization tests, it was found that the expansion time was shortened to 40 minutes and the adsorption efficiency of Cd was increased by 30%. This study provides a new theoretical guidance for improving the efficiency of vermiculite stripping by hydrogen peroxide.
Article
Chemistry, Physical
Huabo Huang, Cheng Li, Jian Luo, Juan Huang, Peng Yu, Liang Li, Chuanxi Xiong
Summary: MnO2 composites, specifically the PANI/MnO2 composite, demonstrate promising potential as electrode materials for supercapacitors due to their low cost, environmental friendliness, and high electrochemical activity. The PANI/MnO2 composite, synthesized using PANI hydrogel as a substrate, exhibits a hierarchically porous structure with a large specific surface area and enhanced electron/ion conduction. This composite delivers wide potential window and high specific capacitances, making it a suitable candidate for symmetric supercapacitors. The study presents a novel approach to construct PANI/MnO2 nanocomposites with optimized electrochemical behavior.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Materials Science, Multidisciplinary
Amara Nasir, Sadia Khalid, Anca Mazare, Tariq Yasin
Summary: In this study, a metal-free conducting nanohybrid composite based on biopolymers was developed for non-enzymatic hydrogen peroxide detection. The composite consisted of crosslinked chitosan and polyaniline grafted graphene oxide. The sensor exhibited a low detection limit, a wide linear range, and high sensitivity.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Jiaying Li, Fengxuan Han, Jinjin Ma, Huan Wang, Jun Pan, Guangbao Yang, He Zhao, Jiayue Zhao, Jinbo Liu, Zhuang Liu, Bin Li
Summary: This study visualizes the spatial and temporal profile of ROS in the bone injury microenvironment using photoacoustic imaging technique for the first time. It demonstrates that the levels of H2O2 increase significantly upon bone injury, peak at a certain stage of bone healing, and gradually decrease towards baseline level. Regulating ROS with hollow manganese dioxide nanoparticles (hMNPs) can promote cell growth and repair in bone injury environments.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Qiao Cong, Miao Ren, Tingting Zhang, Fangyuan Cheng, Jiao Qu
Summary: The study investigated the degradation of triphenylmethane dye using graphene/beta-cyclodextrin composite in a photoelectrocatalytic process. The results demonstrated that the composite effectively eliminated the dye under external bias voltage and sunlight irradiation, showing promising potential for applications in organic pollutant degradation.
Article
Chemistry, Analytical
Sopita Rattanopas, Albert Schulte, Somjai Teanphonkrang
Summary: In this study, effective amperometric sensors for cathodic hydrogen peroxide (H2O2) detection were produced and characterized, demonstrating good linearity and high sensitivity. The combination of PB/CNT layer and gelatin/zein layer in a sandwich-type sensor proved to be successful, providing accurate detection of H2O2 concentrations in model and real samples. The sensors are cost-effective, easy to make, and can be used for electrochemical H2O2 analyses in various applications.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Yanting Shen, Zhichuan Xin, Xiaoxiao Hu, Nan Wang, Shuxia Liu, Jing Wang
Summary: A dual stimulus-responsive core-satellite SERS nanoprobe was constructed for sensitive H2O2 detection. This nanosensor can be used for sensitive detection of cellular H2O2 and enables H2O2 monitoring during starvation-induced autophagy.
Article
Biochemistry & Molecular Biology
Ji Seon Min, Ji Yeon Hong, Yong Geun Lim, Jae Won Ahn, Kyeongsoon Park
Summary: This study demonstrated that glycol chitosan-based MnO2 nanoparticles effectively enhanced the light-triggered photodynamic effects of chlorin e6 on activated macrophages under hypoxic conditions by alleviating hypoxia.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Energy & Fuels
Yibo Zhao, Lu Chang, Wenjing He, Shuyue Xu, Keling Liu, Tingting Huang, Yueyang Li, Minjie Cui, Jiyan Xie
Summary: Polyaniline-based carbon nanofibers were treated with a mixed acid and then reacted with potassium permanganate to obtain manganese dioxide/carbon nanofiber composites. The effects of acid treatment time, reaction temperature, reactant ratio, and the addition method of potassium permanganate on the electrochemical properties of composites were thoroughly studied. The results showed that the optimization parameters were 6 h for acid treatment time, 70 degrees C for reaction temperature, and a reactant ratio of 1:2. In addition, sufficient mixing of the reactants in advance was crucial for the formation of uniformly shaped MnO2 nanoflakes. The acid treatment increased the specific capacitance of the composites from 88.7 to 166.7 F/g, and the composites achieved a lifespan of up to 1000 cycles with 85.08% capacity retention.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Analytical
Sijie Yuan, Ru Yu, Ying Tu, Yanhua Du, Xuan Feng, Fei Nie
Summary: In this study, sulfonated polyaniline (SPAN) was decorated on the surface of copper-based metal organic framework (HKUST-1) and functionalized by luminol to construct a chemiluminescence (CL) hybrid (SPAN/ HKUST-1@Luminol). The prepared hybrid exhibited excellent dispersion and stability in aqueous solution. Additionally, it showed significantly strong CL properties with a quantum yield 136 times higher than luminol. The hybrid demonstrated outstanding CL activity under both alkaline and neutral conditions, and was sensitive to hydrogen peroxide, enabling its use for detection in biological systems and monitoring of H2O2 production by living cells.
Article
Engineering, Environmental
Abeer S. Elsherbiny, Mohamed E. El-Hefnawy, Ali H. Gemeay
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2018)
Article
Environmental Sciences
Ali H. Gemeay, Eman F. Aboelfetoh, Rehab G. El-Sharkawy
WATER AIR AND SOIL POLLUTION
(2018)
Article
Chemistry, Physical
Ali H. Gemeay, Rehab G. EI-Sharkawy, Ikhlas A. Mansour, Ahmed B. Zaki
APPLIED CATALYSIS B-ENVIRONMENTAL
(2008)
Article
Environmental Sciences
Ali H. Gemeay, Basem E. Keshta, Rehab G. El-Sharkawy, Ahmed B. Zaki
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2020)
Article
Environmental Sciences
Ali H. Gemeay, Mohamed E. El-Halwagy, Abeer S. Elsherbiny, Ahmed B. Zaki
Summary: The study successfully prepared a SiO2/PEI-Cu(II) composite by modifying the surface of quartz nanoparticles, and explored its application in the oxidative degradation of RhB dye. Experimental results showed that the composite exhibited good stability and catalytic activity, efficiently degrading the dye.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Ali H. Gemeay, Abeer A. El-Helaly, Mohamed Y. El-Sheikh, Hosny A. El-Daly
Summary: This study compares the efficacy of manganese ferrite/polyaniline (MnxFe3 - xO4/PANI) with spinel manganese ferrite in the polymerization of aniline using K2S2O8 as an oxidant. Various techniques were used to characterize the structural and morphological properties of the nanocomposites. The results showed that the Mn2+-enriched surface enhanced the oxidative performance of Fe3+. The nanocomposites also exhibited excellent adsorption capacity for Lanaset Brown B dye, and the adsorption process was described and evaluated in detail.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Environmental Sciences
Ahmed H. Mangood, Ali H. Gemeay, Mohamed M. Abdel-Galeil, Eman Sh. Salama, Reda E. El-Shater
Summary: Metal substitution strategy was used to synthesize Cd0.5Cu0.5-xAgxFe2O4 ferrites, and their structural, magnetic, catalytic characteristics, and morphology were investigated. The results showed that the catalytic activity of the ferrites could be enhanced by the doping of silver ions. The Cd0.5Cu0.5-xAgxFe2O4 catalysts exhibited excellent performance in the degradation of organic contaminants under acidic and alkaline conditions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Eman F. Aboelfetoh, Abeer A. Elhelaly, Ali H. Gemeay
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2018)
Article
Engineering, Environmental
Ali H. Gemeay, Mohamed E. El-Halwagy, Rehab G. El-Sharkawy, Ahmed B. Zaki
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2017)
Article
Engineering, Environmental
Abeer S. Elsherbiny, Mohamed E. El-Hefnawy, Ali H. Gemeay
CHEMICAL ENGINEERING JOURNAL
(2017)
Article
Chemistry, Physical
Ali H. Gemeay, Rehab G. El-Sharkawy, Ikhlas A. Mansour, Ahmed B. Zaki
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2007)
Article
Polymer Science
AH Gemeay, IA Mansour, RG El-Sharkawy, AB Zaki
EUROPEAN POLYMER JOURNAL
(2005)
Article
Chemistry, Applied
Ali H. Gemeay, Abdel-Fattah M. Habib, Mostafa A. Borhan El-Din
Article
Chemistry, Applied
Ali H. Gemeay, Gehad R. El-Ghrabawy, Ahmed B. Zaki