Article
Physics, Applied
Sunil Luhar, Ramkrishna Rane, Divesh N. Srivastava
Summary: In this study, by treating the plastic chip electrode (PCE) with cold plasma to remove the passivating superficial polymer layer, the bulk conductance and electroactivity of PCE were significantly enhanced.
PLASMA PROCESSES AND POLYMERS
(2022)
Article
Chemistry, Physical
Yongyang Chen, Fulin Li, Xiaochun Dong, Dan Guo, Yixuan Huang, Shanping Li
Summary: Efficient and stable rGO@Ti/SnO2-Sb composite electrodes were prepared by the sol-gel method, characterized by a range of characterization techniques, and shown to have enhanced electrocatalytic oxidation activity for removing organic pollutants from water. The improved activity is attributed to excellent electron transfer efficiency and higher electrode specific surface area. This work provides a simple and effective method for preparing highly active composite electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Shahrzad Forouzanfar, Iman Khakpour, Fahmida Alam, Nezih Pala, Chunlei Wang
Summary: The study introduces a highly sensitive label-free aptasensor based on bipolar electrochemical exfoliated graphene deposited on gold-covered polyethylene terephthalate electrodes (PET/Au), demonstrating high-quality graphene for biosensing applications. The optimized aptasensor shows a linear response in the range of 0.0007-20 nM with a low limit of detection of 0.65 pM, confirming its potential for feasible and affordable point-of-care cancer diagnosis technologies.
NANOSCALE ADVANCES
(2021)
Article
Nanoscience & Nanotechnology
Jiawen Yin, Wanlei Gao, Weijian Yu, Yihua Guan, Zhenyu Wang, Qinghui Jin
Summary: This paper proposes a novel silicon-based electrochemical sensor for free chlorine that can self-clean and be mass produced. The sensor demonstrates good detection performance and linearity, and removes organic matter attached to its surface through an electrochemical digestion process.
MICROSYSTEMS & NANOENGINEERING
(2022)
Review
Chemistry, Physical
Yapeng He, Dandi Zhao, Haibo Lin, Hui Huang, Hongdong Li, Zhongcheng Guo
Summary: This mini review summarizes recent advances in the electrochemical degradation of organic pollutants in aquatic solution using diamond anodes. It discusses the generation mechanisms of reactive species on diamond anodes, such as hydroxyl radicals and active chlorine species. The review also highlights the development of novel efficient diamond anodes to improve the degradation efficiency. Finally, it concludes with the prospects of diamond electrode materials for wastewater treatment applications.
CURRENT OPINION IN ELECTROCHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Iasmin B. Silva, Danyelle Medeiros de Araujo, Marco Vocciante, Sergio Ferro, Carlos A. Martinez-Huitle, Elisama V. Dos Santos
Summary: This study developed a cork-modified carbon paste electrode for the determination of Pb(II) in aqueous solutions, showing high sensitivity and accuracy under SWASV conditions. By optimizing the operating conditions and conducting selectivity analysis, the electrode was successfully applied for the determination of Pb(II) in natural water samples.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Wenda Kang, Liming Yan, Jiahao Tang, Shuai Wu, Hongtao Yu, Zhangliang Li
Summary: In this study, a facile electrochemical activation method was reported to enhance the nitrate reduction ability of graphite electrodes. The activated electrode exhibited a significantly higher nitrate reduction rate and lower solid-liquid interfacial resistance compared to the pristine graphite electrode. Moreover, the activated graphite electrode maintained its excellent performance in nitrate reduction even when enlarged to 2500.0 cm2, suggesting its promising potential for practical application in nitrate removal from water and wastewater.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Chemical
Debabrata Mohanty, Yi-Hung Wang, Ya-Chen Tsai, I-Ming Hung
Summary: Vanadium oxide is an environmentally friendly material, but its economic utilization is challenging due to the inability to control the size of etched holes. In this study, copper/graphite felt composite electrodes with controllable hole depth were prepared by electrodeposition and etching. The composite electrodes exhibited good material characteristics and electrochemical performance under specific etching temperature and time conditions.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Analytical
Mansoureh Lalei, Kobra Zarei
Summary: In this study, a modified pencil graphite electrode with ruthenium nanoparticles and thiobarbituric acid was used to measure acyclovir using an adsorptive differential pulse voltammetric technique. The modified electrode was characterized using field emission scanning electron microscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. The method was optimized for ACV measurement and showed accurate and precise results when applied to tablet and urine samples.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Physical
Victor Vanpeene, Patrick Soucy, Jianhan Xiong, Nicolas Dupre, Bernard Lestriez, Lionel Roue
Summary: A new method was demonstrated in this study to monitor the morphological degradation of a Si/graphite blended electrode for Li-ion batteries, by creating a FIB milled microcavity and observing it at different cycling periods. By monitoring various parameters, a more comprehensive understanding of the electrode's morphological changes during cycling was achieved.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Peng Wang, Xinxin Zhu, Yihong Ding, Lixiong Shao, Huile Jin, Lichen Zhang, Xintong Wang, Tianbiao Zeng
Summary: The study presents a simple synthesis method for nanostructured Fe2GeS4 anchored on graphite as a negative electrode material for sodium-ion batteries. The material exhibits high capacity, fast ion diffusion, and good thermal stability, and shows excellent reversible charge-discharge performance. This research provides a reference for the production of high-performance Fe2GeS4-based negative electrode materials for sodium-ion batteries.
Article
Multidisciplinary Sciences
Jie Song, Yating Wan, Chen Yang, Qiuju Deng, Yingde Cui, Zhihong Yan, Yi Liu
Summary: In this paper, a novel composite material composed of copper oxide, cuprous oxide, silver nanoparticles doped with few-layer graphene was constructed as a non-enzymatic hydrogen peroxide sensor. The sensor exhibited high sensitivity, fast response time, low detection limit, and outstanding selectivity. It also demonstrated long-term stability and broad application possibilities in the food industry and biological medicine.
SCIENTIFIC REPORTS
(2023)
Article
Electrochemistry
Zehra Gok, Sezen Kucukcongar, Mehmet Turkyilmaz, Secil Tutar Oksuz
Summary: In this study, the efficiency of different electrode pairs and the operating conditions in the reactor were investigated for the electrochemical oxidation treatment of strained yoghurt wastewater. The electrode type did not significantly affect organic matter removal. The applied potential was determined as the most effective operating condition, followed by reaction time and electrode distance. The electrochemical oxidation process showed effective COD removal at low reaction times and low specific energy consumption (SEC).
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Article
Chemistry, Analytical
F. J. Juni, S. R. Majid, S. N. F. Yusuf, Z. Osman
Summary: Metal-organic frameworks (MOF) are a new class of porous materials that have controllable morphology, high porosity, and multifunctionalities. In this study, a simple and cost-effective method was introduced to synthesize MOF using copper ions and 2-methylimidazole, and then derived Cu/Cu2O/C composite as electrode materials for supercapacitor application. The heated MOF at 900℃ showed excellent electrochemical properties and demonstrated new insights of copper-based MOF as electrode materials for energy storage applications.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Yalcin Altunkaynak, Omer Yavuz, Abdulkadir Levent
Summary: This work successfully determined vildagliptin at a pencil graphite electrode using cyclic voltammetry and square-wave voltammetry. A well-defined irreversible peak response was obtained, showing a good linear correlation between anodic current signal and concentration of vildagliptin. The developed voltammetric method was successfully applied for determination in pharmaceutical preparations and urine samples without the need for separation.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Abolanle S. Adekunle, Olayemi J. Fakayode, Bhekie B. Mamba, Thabo T. I. Nkambule
Summary: This study reports a method for the determination of humic acid and sodium alginate using glassy carbon electrodes modified with iron oxide and copper oxide nanoparticles. The modified electrodes showed higher current responses and lower charge transfer resistance compared to the bare electrode. The developed sensors can be used for detection and monitoring of humic acid and sodium alginate in water samples.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Environmental Sciences
T. Lukhele, H. J. O. Ogola, R. Selvarajan, R. O. Oruko, H. Nyoni, B. B. Mamba, T. A. M. Msagati
Summary: Long-term exposure to anthropogenic stressors can impact microbial communities, resulting in either novel biotypes or reduced microbial diversity. Tannery waste dumpsite soils show lower species diversity but distinct core microbiome with potential for bioremediation tools.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Review
Environmental Sciences
Lebea N. Nthunya, Mokgadi F. Bopape, Oranso T. Mahlangu, Bhekie B. Mamba, Bart Van der Bruggen, Cejna Anna Quist-Jensen, Heidi Richards
Summary: While water is essential for life, freshwater sources are depleting rapidly. Desalination of saline water through membrane technology is a common method to supplement water resources, but faces challenges such as membrane fouling. Different membrane processes like RO, PV, ED, MD, and MCr are used, with MD showing potential for high performance and cost efficiency.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Food Science & Technology
Tsholofelo Sebokolodi, Dimpo S. Sipuka, Tebogo R. Tsekeli, Duduzile Nkosi, Omotayo A. Arotiba
Summary: This study investigates the electrochemical behavior of caffeine on an acid-activated carbon nanofiber modified glassy carbon electrode. The results show that the presence of the carbon nanofiber modifier increases the rate of the electrochemical reaction and enhances the sensitivity of caffeine detection.
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2022)
Article
Chemistry, Analytical
Dimpo S. Sipuka, Omotayo A. Arotiba, Tsholofelo Sebokolodi, Tebogo R. Tsekeli, Duduzile Nkosi
Summary: An electrochemical sensor for dopamine detection was developed by electrodepositing poly(propylene imine) (PPI) dendrimer and gold nanoparticles (AuNPs) onto a glassy carbon electrode (GCE). The sensor exhibited improved electrochemical response and successfully detected dopamine in human serum samples.
Article
Chemistry, Physical
Dimpo S. Sipuka, Tsholofelo Sebokolodi, Foluke O. G. Olorundare, Charles Muzenda, Oluchi Nkwachukwu, Duduzile Nkosi, Omotayo A. Arotiba
Summary: A carbon nanofiber-gold nanoparticle electrochemical sensor was fabricated for the detection of epinephrine. The sensor showed enhanced electrocatalytic effect compared to the bare electrode, and square wave voltammetry was used for quantifying epinephrine. The study characterized the properties of the materials and the electrochemical performance of the electrodes using various techniques.
Article
Chemistry, Physical
Huizhong Wu, Zhongzheng Hu, Ruiheng Liang, Oluchi V. Nkwachukwu, Omotayo A. Arotiba, Minghua Zhou
Summary: A Bi2Sn2O7 quantum dots/TiO2 nanotube arrays photoanode was fabricated for efficient and stable photoelectrocatalytic degradation of sulfamethazine under low potential and LED illumination. The photocatalysis and electrocatalysis synergistic factor reached 10.1 in the Bi2Sn2O7/TiO2 system. The improved performance was attributed to enhanced light-harvest capability, lower charge transfer resistance, more efficient photoexcited charge separation, and higher redox ability to produce photo-generated holes and reactive oxygen species.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Zhongzheng Hu, Ruiheng Liang, Xiangru Song, Huizhong Wu, Jiangli Sun, Jingyang Liu, Minghua Zhou, Omotayo A. Arotiba
Summary: In this study, a self-driven dual-photoelectrode PEC system (TiO2 NNs-Co3O4) was developed, consisting of a TiO2 nanoneedle arrays (TiO2 NNs) photoanode and Co3O4 photocathode. Under LED illumination, the bias-free TiO2 NNs-Co3O4 PEC system showed excellent performance, achieving near complete degradation (99.62%) of sulfamethazine (SMT) with a pseudo-first-order rate constant of 0.042 min(-1) and an internal bias as high as 0.19 V. The effects of solution pH, typical inorganic anions, natural organic matter, and initial SMT concentration on the PEC performance were investigated. The main reactive oxygen species (h(+), (OH)-O-center dot, O-center dot(2)-) in the dual-photoelectrode PEC system for SMT decomposition were also identified.
Article
Chemistry, Physical
Oluchi V. V. Nkwachukwu, Charles Muzenda, Kehinde D. D. Jayeola, Tsholofelo I. I. Sebokolodi, Dimpo S. S. Sipuka, Marc Cretin, Minghua Zhou, Duduzile Nkosi, Omotayo A. A. Arotiba
Summary: Electrodeposited bismuth ferrite (BiFeO3) thin films were used as photoanodes for the photoelectrocatalytic degradation of methylene blue. The morphology, thickness, and optical properties of the films were characterized by XRD, FESEM, and UV-vis spectroscopy. The photoanodes showed increased band gaps and improved photocurrent response with shorter electrodeposition times. The removal of methylene blue showed higher degradation rates with shorter electrodeposition times. The electrodeposition process with citric acid improved electrode stability and reduced catalyst leaching.
Article
Chemistry, Physical
Zhongzheng Hu, Minghua Zhou, Hubdar Ali Maitlo, Ruiheng Liang, Yang Zheng, Huizhong Wu, XiangRu Song, Omotayo A. Arotiba
Summary: A novel tandem photoelectrocatalysis (PEC) cell consisting of TiO2 nanoneedle arrays (TiO2 NNs/Ti mesh) photoanode and nitrogen-doped carbon dots (NCDs) modified Co3O4 photocathode (NCDs/Co3O4/Ti mesh) is designed for efficient water purification. The system shows high activity, stability, and energy efficiency for sulfadiazine removal. The cooperative operation mechanism of the two photoelectrodes is elucidated.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Babatunde A. Koiki, Charles Muzenda, Kehinde D. Jayeola, Minghua Zhou, Frank Marken, Omotayo A. Arotiba
Summary: This article introduces a simple and clean method for the production of sulfate radicals for water treatment, namely electrochemical and photoelectrochemical activation techniques. The photoelectrochemical activation method shows great potential as it effectively treats various pollutants by using highly reactive oxidizing species. The article provides a detailed account of the applications of sulfate radical enhanced photoelectrochemical treatments for water contaminated with organics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Babatunde A. Koiki, Omotayo A. Arotiba
Summary: This work presents the sulphate radical assisted photoelectrocatalytic degradation of tetracycline using a visible light active fluorine-doped tin oxide - tungsten trioxide nanorods photoanode. The results show that the presence of sulphate radicals significantly enhances the degradation of tetracycline, with a high extent of degradation achieved within a short period of time. The FTO-WO3 NRs photoanode is stable and reusable, making it suitable for the decontamination of water polluted with pharmaceuticals.
Article
Chemistry, Analytical
Foluke O. G. Olorundare, Dimpo S. Sipuka, Tsholofelo I. Sebokolodi, Tetsuya Kodama, Omotayo A. Arotiba, Duduzile Nkosi
Summary: The early detection of cancer is crucial, and low-cost technologies such as electrochemical immunosensors have been developed for timely screening. Alpha-feto protein (AFP) has been identified as a cancer biomarker and can be targeted by immunosensors for diagnostics. In this study, a hybrid nanocomposite of carbon black nanoparticles (CBNPs) and palladium nanoparticles (PdNPs) was used as a platform for electrochemical immunosensing. The immunosensor demonstrated high sensitivity and stability, with a wide linear detection range and low limits of detection.
ANALYTICAL METHODS
(2023)
Article
Engineering, Environmental
Kehinde D. Jayeola, Dimpo S. Sipuka, Tsholofelo I. Sebokolodi, Oluchi V. . Nkwachukwu, Charles Muzenda, Babatunde A. Koiki, Jonathan O. Babalola, Minghua Zhou, Omotayo A. Arotiba
Summary: In this paper, a Z-scheme heterojunction of Bi2O2S and ZnO nanoparticles was prepared for the removal of ciprofloxacin from wastewater. The heterojunction showed enhanced degradation performance compared to individual Bi2O2S and ZnO photoanodes, attributed to the presence of an internal electric field, low recombination rate of photogenerated electrons and holes, lower charge transfer resistance, and high photocurrent density. The performance of the heterojunction was characterized and analyzed through various techniques, and it was found to be stable after several treatment cycles. The paper demonstrates the potential of Z scheme band gap engineering of semiconductors for pharmaceutical removal in wastewater.
CHEMICAL ENGINEERING JOURNAL
(2024)
Article
Chemistry, Multidisciplinary
Babatope O. Ojo, Omotayo A. Arotiba, Nonhlangabezo Mabuba
Summary: The sonoelectrochemical oxidation of sulfamethoxazole (SMX) in simulated and actual wastewater using different electrodes was investigated. The FTO/BaZr(0.1)Ti(0.9)O3 electrode exhibited the highest sonocurrent density response and the lowest charge transfer resistance, leading to efficient degradation of SMX. The piezo-polarizable effect of the FTO/BaZr(0.1)Ti(0.9)O3 electrode played a significant role in the generation of reactive species and the decomposition of pharmaceuticals.
