Article
Engineering, Environmental
Yuwei Zhao, Shayan Hojabri, Stephanie Sarrouf, Akram N. Alshawabkeh
Summary: Efficient and steady electrogeneration of H2O2 is achieved using a specially coated graphite felt cathode in a flow-through system without external oxygen supply. The PDMS coating inhibits electrowetting and extends the electrode's lifespan, though increasing PDMS content can reduce H2O2 production. The modified graphite felt exhibits high stability and performance in a neutral or alkaline environment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Dongliang Wang, Jingping Hu, Bingchuan Liu, Huijie Hou, Jiakuan Yang, Yuxiao Li, Yi Zhu, Sha Liang, Keke Xiao
Summary: The research found that using a dual-cathode microbial fuel cell electro-Fenton hybrid system can simultaneously enhance MFC power generation and organic degradation efficiency, showing significant degradation effects on Rhodamine B, methyl orange, and 4-chlorophenol with higher removal efficiency than uncoupled EF system.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Xiaozhe Song, Huan Zhang, Zhaoyong Bian, Hui Wang
Summary: The study introduces a new strategy for electron-Fenton-like process with in situ H2O2 production using bifunctional catalysts with Fe atoms introduced into defect-enriched graphene sheets (Fe/NDG). The Fe/N-DG catalysts exhibit superior mass activity and H2O2 selectivity, even under extreme pH conditions, showing promising potential for antibiotic wastewater treatment. The Fe1/N-DG catalyst with a predominant Fe-N structure demonstrates the best catalytic performance for chloramphenicol removal, providing new insights into atomic Fe-based catalysts for environmental applications.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
I Salmeron, I Oller, K. Plakas, S. Malato
Summary: The autopsy of carbon-PTFE cathodes in a plate-and-frame cell with a Nb-BDD anode revealed a significant decrease in H2O2 electrogeneration, hindering the efficient performance of Fenton-like processes. The study found that the first cathode suffered surface degradation, while the second cathode had iron oxide inlays due to the decomposition of Fe3+:EDDS and iron precipitation at neutral pH.
Article
Engineering, Environmental
Shuhao Huo, David Necas, Feifei Zhu, Dongjie Chen, Jun An, Nan Zhou, Wei Liu, Lu Wang, Yanling Cheng, Yuhuan Liu, Roger Ruan
Summary: The study demonstrated that H2O2-enhanced EFC treatment can effectively remove pollutants in swine wastewater, improve light penetration in dark effluent, and enhance photosynthesis of algae. Additionally, adjusting the initial N:P ratio in algae culture can increase biomass accumulation and protein production.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Xiao-Yuan Lv, Guan-Ping Jin, Ding-Kun Yuan, Yan-Feng Ding, Peng-Xing Long
Summary: Copper hexacyanocobaltate was electro-deposited on amino-graphene-coated indium-tin-oxide glass to form a multifunctional heterogeneous catalyst, which was utilized to establish a novel heterogeneous photo-electro-Fenton-like system capable of generating hydrogen peroxide and hydroxyl radical simultaneously. The system showed high productivity of hydroxyl radicals and efficient degradation of levofloxacin in neutral media.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Jingjing Hu, Sen Wang, Jiaqi Yu, Wenkai Nie, Jie Sun, Shaobin Wang
Summary: The Fe-based catalyst with core-shell structure showed significant performance in degrading chlorophenols under various conditions while maintaining low levels of leached iron. Experimental results confirmed center dot OH as the key reactive species, with Fe-IV playing a role in neutral conditions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Review
Environmental Sciences
Jingwen Wang, Chaolin Li, Muhammad Rauf, Haijian Luo, Xue Sun, Yiqi Jiang
Summary: The use of gas diffusion electrodes (GDEs) as cathodic electrocatalysts for efficient H2O2 production shows promising potential in degrading organic pollutants, with its cost-effectiveness and higher oxygen utilization efficiency compared to other carbonaceous cathodes. The research and practical application of GDEs for organic pollutant degradation have been well developed in recent years, highlighting the novel design, fundamental aspects, and electrochemical properties of GDEs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Anlin Xu, Wanqun Liu, Ziyan Yang, Liya Cao, Ignasi Sires, Qiqi Zhang, Yongjun Zhang
Summary: In this work, waste tire-derived carbon was used as an electroactive material to manufacture a gas-diffusion cathode for electrochemical production of H2O2. Acidification with HNO3 was found to significantly enhance the H2O2 production. The cathode was also able to effectively degrade tinidazole (TNZ), a nitroimidazole antibiotic. The study demonstrates the potential of waste tires as a source of inexpensive carbon for in-situ H2O2 synthesis and water decontamination.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Yanyang Chu, Hongzhao Su, Chang Liu, Xianglei Zheng
Summary: Various composite cathodes were prepared and characterized, with the finding that using polyurethane sponge in cathode-shaping can greatly enhance the hydrophobic property of the cathodes and lead to the preparation of super-hydrophobic carbon cathodes. These cathodes showed improved reduction of O2 to H2O2, making them ideal for electro-generation of H2O2 with high efficiency and stability in the degradation of cefepime.
Article
Engineering, Chemical
Dongliang Wang, Yuxiao Li, Shaogang Hu, Jingping Hu, Huijie Hou, Bingchuan Liu, Han Zheng, Xi Luo, Haixiao Li
Summary: This research designed a triple-cathode EF system for efficient degradation of recalcitrant organic pollutants. The system exhibited improved removal rate with low electricity consumption and reduced Fe2+ dosage. This work demonstrates a novel and cost-effective approach for efficient EF.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Mengling Peng, Jiahong He, Jibin An, Taiping Xie, Tiantao Zhao, Guoqiang Li
Summary: This study developed a novel reagent-free three-dimensional electro-Fenton system for efficient degradation of Roxarsone. The system showed high H2O2 yield and excellent durability, achieving a degradation rate of at least 90% over a relatively wide pH range.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Electrochemistry
Mengqiong Zhang, Jun Yan, Dong Wang, Xiaoli Dong, Hongchao Ma, Huangzhao Wei, Guowen Wang
Summary: The COVID-19 pandemic has accelerated the development of wastewater purification technologies, such as electro-Fenton. Through careful investigation, we have found that a Fe-doped ZnO electrode can achieve a Faradaic efficiency of 78% for H2O2 electrogeneration at a voltage of 3.2 V vs. RHE, and maintain a current density of 10 mA cm(-2) for at least 6 hours. This electrocatalytic process can generate hydroxyl radicals, which can be used for the treatment of contaminated water. Additionally, this electrode system can effectively remove microbial contamination, with a killing rate of up to 99%.
ELECTROCHIMICA ACTA
(2023)
Article
Environmental Sciences
Ying Gao, Weihuang Zhu, Yaqi Li, Qingyu Zhang, Haonan Chen, Jianfeng Zhang, Tinglin Huang
Summary: A novel binder-free AQS/PANI@CF cathode for selective H2O2 generation and efficient pollutant removal in electro-Fenton was fabricated, showing high stability and repeatability. The cathode achieved a high H2O2 concentration of 83.3 mu mol L-1 and a RhB degradation efficiency of 98.8% within 60 minutes. The main generated reactive radicals were identified through quenching experiments and EPR tests, and a plausible mechanism of the cathode applied electro-Fenton process was proposed. This work serves as a reliable reference for subsequent investigations.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Chemical
Linhui Lu, Qingli Shu, Guiru Zhang, Qi Zhang, Ping Du, Xuedong Zhu
Summary: A series of ClxFePd/γ-Al2O3/Al catalysts were prepared and exhibited excellent performance in H2O2 in situ synthesis and phenol degradation. Cl doping was found to enhance the catalyst activity, promote H2O2 synthesis, and inhibit side reactions. Based on the experimental results, a plausible reaction mechanism and degradation pathways were proposed.
Article
Engineering, Environmental
Krishnasamy Sivagami, Govindaraj Divyapriya, Ramya Selvaraj, P. Madhiyazhagan, N. Sriram, Indumathi Nambi
Summary: The catalytic pyrolysis of various types of polyolefin and multilayer plastic waste using commercial zeolite catalyst in a batch pilot scale reactor was studied. It was found that BOPP based plastic waste exhibited higher oil yield and calorific value, and by modifying the feed composition, the physicochemical characterization of the resulting pyrolysis oil could be significantly altered.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Environmental Sciences
G. Divyapriya, Seema Singh, Carlos A. Martinez-Huitle, Jaimy Scaria, Ansaf Karim, P. Nidheesh
Summary: Photoelectrochemical methods are emerging as promising options among advanced oxidation processes due to their higher treatment efficiency and synergistic effects. This review discusses the fundamental reaction mechanisms, integrated processes, real wastewater treatment, and hydrogen production efficiency in photoelectrochemical methods.
Review
Environmental Sciences
Ashitha Gopinath, G. Divyapriya, Vartika Srivastava, A. R. Laiju, P. Nidheesh, M. Suresh Kumar
Summary: Production of biochar from sewage sludge helps in sustainable resource recovery and efficient wastewater treatment by eliminating toxic contaminants. Biochar possesses reusability, availability, and effectiveness in removing pollutants, making it a viable option for wastewater treatment.
ENVIRONMENTAL RESEARCH
(2021)
Review
Materials Science, Multidisciplinary
G. Divyapriya, P. Nidheesh
Summary: This review discusses the activation mechanisms and environmental applications of sulfate radicals generated by BDD electrode in treating organic contaminants. The importance of BDD electrode properties and electrolyte composition on the reactivity of sulfate radicals is highlighted.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Abdul Malek, Anusha Ganta, Govindaraj Divyapriya, Indumathi M. Nambi, Tiju Thomas
Summary: The study introduces a method of simultaneous hydrogen production from urine by in situ formation of aluminum nanoparticles through a redox reaction. The volume of hydrogen produced is sensitive to pH, amount of Al salt, and ageing, with fresh urine showing better results.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Environmental Sciences
Saranya Sriram, Indumathi M. Nambi, Raghuram Chetty
Summary: A novel sediment-water electrolytic fuel cell (SWEFC) for reducing Cr(VI) in a dual-phase system was fabricated and showed high reduction efficiency. The use of cow dung as an electron donor enhanced the performance. The SWEFC also demonstrated efficient performance in a large-scale reactor configuration.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Microbiology
Dongjuan Dai, Connor Brown, Helmut Burgmann, D. G. Joakim Larsson, Indumathi Nambi, Tong Zhang, Carl-Fredrik Flach, Amy Pruden, Peter J. Vikesland
Summary: By using long-read sequencing, this study reveals that the activated sludge treatment in wastewater treatment plants acts as a barrier against the proliferation of most antibiotic resistance genes (ARGs), although some genes still persist or increase and require further attention.
Article
Water Resources
Divakar Raj Dinakaran, Hemaiswarya Shanmugam, Indumathi M. Nambi, Mukesh Doble
Summary: This study used uidA and lacZ genes as distinctive biomarkers for rapid and efficient detection of contaminated water resources. A total of 39 water samples from the metropolitan city of Chennai, India were collected and analyzed. The results showed that the performance and amplification efficiency of uidA and lacZ were 99.6% and 103.4% respectively. The qPCR method had a sensitivity of 71.4% in selectively identifying E. coli.
WATER PRACTICE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Sasikaladevi Rathinavelu, Govindaraj Divyapriya, Angel Joseph, Indumathi M. Nambi, Anantha Barathi Muthukrishnan, Guhan Jayaraman
Summary: This study investigates the behavior and intracellular changes in Escherichia coli during electrooxidation, achieving effective disinfection mainly through oxidative damage of cells by hydroxyl radicals. Low cost electrode materials can effectively disinfect real wastewater with low energy consumption and operational costs.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Maria Virginia Prieto Riquelme, Emily Garner, Suraj Gupta, Jake Metch, Ni Zhu, Matthew F. Blair, Gustavo Arango-Argoty, Ayella Maile-Moskowitz, An-dong Li, Carl-Fredrik Flach, Diana S. Aga, Indumathi M. Nambi, D. G. Joakim Larsson, Helmut Buergmann, Tong Zhang, Amy Pruden, Peter J. Vikesland
Summary: This study presents a comprehensive metagenomics-based approach for global surveillance of antibiotic resistance in sewage. The results show that there are shared antibiotic resistance genes (ARGs) across different regions/communities, and certain ARGs can be used as discriminatory markers to differentiate Asian and European/US resistomes. The study also reveals discrepancies between measured antibiotic concentrations and public sales data, suggesting that wastewater-based surveillance (WBS) can capture additional antibiotic uses that are not accounted for. The WBS approach demonstrated in this study is sensitive to local/regional factors and can provide comparable results across different sites.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
P. Tamizhdurai, N. Sakthipriya, K. Sivagami, Bokam Rajasekhar, Indumathi M. Nambi
Summary: This study assesses the impact and effectiveness of bioremediation on the environment and suggests the need for additional treatment methods for residual petroleum hydrocarbons.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Xiuming Sun, Daniel Rosado, Georg Hoermann, Zhenyu Zhang, Lukas Loose, Indumathi Nambi, Nicola Fohrer
Summary: Water quality and scarcity have become serious problems worldwide in recent decades, and India is no exception. This study aimed to investigate the impact of human activities on the water quality of a lake cascading system in India. The results showed clear temporal and spatial variation in water quality, with better quality during the rainy season and downstream lakes. Land use/cover types, such as crops, woodland, and urban areas, had negative effects on water quality, while grassland had positive effects. This study highlights the importance of considering land use and seasonality in managing and improving water quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Saranya Sriram, Indumathi M. Nambi, Raghuram Chetty
Summary: A proof-of-concept study demonstrates a fuel cell type electrochemical cell that can simultaneously treat wastewater and desalinate water. The cell utilizes the potential difference and concentration gradient between waste streams to convert chemical energy into electrical energy. When urea is used as the electron donor, a reduction of 96.2 +/- 0.4% in Cr(VI) concentration and a salt removal rate of 63.1 +/- 0.2% are achieved within 4 hours, with a maximum power output of 15.2 mW. A benchtop prototype with six anode-cathode configurations achieves a 95.2 +/- 2% reduction in Cr(VI) concentration and a desalination rate of 70.7 +/- 0.2% within 20 hours, generating 55.2 mW of power.
Article
Environmental Sciences
Sangeeth John, Sasikaladevi Rathinavelu, Sagayanathan Monica Susai Mary, Indumathi Manivannan Nambi, Sridharan Moorthy Babu, Tiju Thomas, Shubra Singh
Summary: This study proposes an efficient strategy for degrading the persistent antibiotic contaminant, ciprofloxacin (CIP). A hybrid advanced oxidation process (HAOP) is tailored with a synergy effect between photocatalysis and photo-Fenton catalysis on a zinc ferrite-titania heterostructured composite (ZFO-TiO2). The results show that the HAOP system significantly enhances the degradation rate of CIP, outperforming conventional TiO2-based photocatalysis. The study also identifies the intermediates and degradation pathways of CIP, and demonstrates the reduced toxicity of the photodegraded samples.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Krishnasamy Sivagami, Keshav Kumar, Perumal Tamizhdurai, Dhivakar Govindarajan, Madhiyazhagan Kumar, Indumathi Nambi
Summary: Catalytic pyrolysis of mixed plastic waste to fuel oil was tested using different catalysts, including ZSM-5 zeolite. The study found that polyolefin based plastics yielded higher oil and had higher calorific value compared to other types of plastics. The synthesized ZSM-5 zeolite catalyst, with its strong acidity and microporous structure, showed improved cracking and increased oil yield in the pyrolysis experiments.