Article
Green & Sustainable Science & Technology
Nadia Gadi, Nadine C. Boelee, Raf Dewil
Summary: The study demonstrates the efficacy of coupling adsorption with the electro-Fenton process for the removal and regeneration of caffeine using low-cost granular activated carbon. The results show high degradation and mineralization rates of caffeine in different matrices, and successful regeneration of the activated carbon.
Review
Engineering, Environmental
Naomi A. Bury, Kathryn A. Mumford, Geoffrey W. Stevens
Summary: Electrochemical regeneration of Granular Activated Carbon is an efficient method for removing organic contaminants from water. By controlling critical operating parameters and understanding the regeneration mechanisms, optimal operating conditions can be achieved, enhancing the commercial prospects of these technologies.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Electrochemistry
Clement Trellu, Maxim Gibert-Vilas, Yoan Pechaud, Nihal Oturan, Mehmet A. Oturan
Summary: The electro-Fenton process is a promising technology for the regeneration of activated carbon, with the use of AC fiber presenting crucial advantages. By adjusting operating conditions, a regeneration yield of up to 88% can be achieved. The oxidation in the solution helps to continuously desorb organic compounds for effective regeneration.
ELECTROCHIMICA ACTA
(2021)
Article
Engineering, Environmental
Qianxin Zhang, Menghan Zhang, Tong Li, Roujia Du, Gang Yu, Shubo Deng
Summary: In this study, FeOCl confined into activated carbon (FeOCl/AC) was used for catalytic oxidation of contaminants on spent activated carbon. The results showed that FeOCl/AC had high regeneration efficiency and remained stable even after multiple cycles of adsorption and regeneration.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Zhimin He, Xiaoyi Xu, Bin Wang, Zhenfei Lu, Dezhi Shi, Wei Wu
Summary: In this study, iron-loaded granular activated carbon (Fe-GAC) was prepared and used as a catalyst in the heterogeneous Fenton oxidation treatment of tetracycline (TC). The Fe-GAC/Fenton system showed a higher removal rate and lower catalyst dosage compared to the GAC/Fenton system. Additionally, Fe-GAC/Fenton exhibited higher mineralization efficiency.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Electrochemistry
Patrick Compton, Nazli Rafei Dehkordi, Stephanie Sarrouf, Muhammad Fahad Ehsan, Akram N. Alshawabkeh
Summary: A novel three-dimensional electrochemical flow-through reactor is proposed for the removal and degradation of recalcitrant organic contaminants in water. The reactor utilizes activated carbon encased in a stainless-steel mesh as a cathode and shows a nearly 20% improvement in removing model contaminants compared to traditional adsorption methods.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Jian Shen, Yahui Wu, Yaohua Yang, Qiongzhi Zhou, Xiang Liu, Tianxiang Wei, Xinyi Yu, Yifei Yu, Haitao Li, Tian Fang
Summary: In this study, dyeing based sludge carbons were activated via alkali etching to fabricate efficient and cost-effective heterogenous electro-Fenton catalysts for halogen-containing compounds removal. The increment of alkali activation level facilitated oxygen reduction towards a two-electrons transfer pathway with a high H2O2 yield. After a reaction time of 150 min, the catalyst achieved a 100% removal rate and a 62.14% mineralization efficiency for 4-Chlorophenols (4-CPs). The activated sludge carbons showed excellent stability even after enduring five cycles.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Analytical
Josue Daniel Garcia-Espinoza, Irma Robles, Alfonso Duran-Moreno, Luis A. Godinez
Summary: The combination of activated carbon adsorption and electro-Fenton effects under neutral pH conditions is effective in overcoming limitations posed by low pH values and iron chemicals in electro-Fenton wastewater treatment processes.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Environmental Sciences
Liang Ma, Zuming Wu, Mengya He, Liwang Wang, Xuejing Yang, Jinling Wang
Summary: In this study, Fenton reagent was used to oxidize and regenerate resin-based spherical activated carbon (SAC) adsorbed with saturated toluene. The effects of the mole ratio of Fe(2+) and H2O2, the dosage of H2O2, pH value, temperature, regeneration time, and other factors on the regeneration rate of activated carbon were investigated. The results showed that the highest regeneration rate of activated carbon reached 95.69%. The optimal regeneration conditions were a molar ratio of Fe(2+) and H(2)O(2) of 1/25, an H(2)O(2) concentration of 175 mmol/L, a pH of 2, a temperature of 20℃ to 30℃, and a regeneration time of 180 min. The influence of the regeneration process on the characterization of activated carbon was studied through BET analysis and SEM analysis.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Chemistry, Physical
Silvia Escudero-Curiel, Marta Pazos, Angeles Sanroman
Summary: Pharmaceuticals and personal care products (PPCPs) pose harm to ecosystems and human health, and regulating discharges at wastewater treatment plants (WWTPs) has become a priority. This study evaluated the removal of Fluoxetine (FLX) through adsorption and regeneration cycles using NQ40 honeycomb 3D carbon aerogel as a high-capacity adsorbent. The regeneration process using Fenton and Fenton-like methods demonstrated the effectiveness of hydrogen peroxide in removing high concentrations of FLX.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Environmental
Yu Huang, Lin Shi, Xiaofei Chen, Liandong Zhu, Xuhui Mao, Tao Xu, Hua Zhu, Xu Wang
Summary: This study introduces a flow-through cathode based on commercial polyacrylonitrile-based carbon fiber for electro-Fenton systems. The cathode effectively degrades micropollutants in wastewater through the generation of reactive oxygen species. This research provides a solution for the design and fabrication of feasible flow-through electrodes.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Chemistry, Multidisciplinary
Xu Chen, Ziqi Tian, Qihao Yang, Linjuan Zhang, Qiu Yang, Liang Chen, Zhiyi Lu
Summary: This study demonstrates that isolated Fe sites anchored on commercial PAC enable fast H2O2 activation for highly efficient PAC regeneration. The isolated HO-Fe(sic)O motifs activate H2O2 via a nonradical reaction pathway, providing a promising strategy for reducing the cost of H2O2-based PAC regeneration technology.
Article
Environmental Sciences
Davide Clematis, Marco Panizza
Summary: The treatment of Erythrosine B using electrochemical advanced oxidation processes (EAOPs) like electro-Fenton, UVA photoelectro-Fenton, and solar photoelectro-Fenton was studied. Irradiation was found to be crucial in increasing hydroxyl radical production and in the recover of iron catalyst, leading to faster color and COD removal degradation under light application. The UVA photoelectro-Fenton process with a 100W lamp showed the best removal performance but high energy demand, while the solar photoelectro-Fenton system had the lowest and competitive energy demands with complete removal.
Article
Engineering, Environmental
Yue Yang, Mingmei Zheng, Sen Qiao, Jiti Zhou, Zhen Bi, Xie Quan
Summary: An innovative electro-Fenton enhanced membrane photobioreactor was constructed using porous carbon and carbon nanotubes hollow fiber membranes (PC-CHFMs) as the separation unit and cathode, resulting in successful microalgae harvesting with satisfactory membrane fouling mitigation.
Article
Green & Sustainable Science & Technology
Jonathan J. Machorro Lopez, Ana Lilia Lazaro, Francisco J. Rodriguez-Valadez, Fabricio Espejel-Ayala
Summary: This research evaluated the synthesis of sodium titanate catalysts for biodiesel production, with trititanate being identified as the most efficient catalyst for converting soybean oil to biodiesel under specific conditions. Characterization of the titanates was carried out using XRD, SEM, and N(2) physisorption techniques, revealing the presence of tri and hexatitanate structures. The optimal conditions for preparing the efficient catalyst were determined to be: NaOH concentration of 7.5 M, hydrothermal temperature of 130 degrees C, TiO2/NaOH ratio of 0.06 g/mL, and calcination temperature of 600 degrees C.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2021)
Article
Energy & Fuels
Irma Robles, Fabricio Espejel-Ayala, Guillermo Velasco, Arely Cardenas, Luis A. Godinez
Summary: This study focused on identifying the best conditions and studying the effects of the operational variables on the integral valorization process of used coffee ground. The results showed that the best conditions for oil extraction were a drying time of 50 degrees C/12 h, ethanol as a solvent with a 12:1 solvent ratio (v/v), and 30 min of extraction time, resulting in the extraction of 0.4 g of oil per gram of spent coffee ground. For the preparation of activated carbon, the best conditions were an activating agent ratio of 1 g(AA)/g(S) and a carbonization temperature of 450 degrees C, resulting in a sorption capacity of 29 mg/g. Additionally, the study found that the extracted coffee oil had a high content of free fatty acids, suggesting the need for an additional purification process.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Green & Sustainable Science & Technology
Manuel Sanchez-Cardenas, Luis A. Sanchez-Olmos, Sathish-Kumar Kamaraj, Fernando Trejo-Zarraga, Francisco J. Rodriguez-Valadez
Summary: Pt/γ-Al2O3 catalysts prepared by incipient wet impregnation showed good performance in hydrodeoxygenation reactions, converting oleic acid to n-C-17 alkanes with a high conversion rate of 96.5%. Mixtures of 20% and 40% RD with diesel resulted in slight decreases in efficiency at full load, but significant reductions in air pollutants emissions were observed, with RD40 achieving over 22% reductions in CO and HC emissions and nearly 43% reduction in smoke emissions compared to diesel.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2021)
Article
Environmental Sciences
J. Trevino-Resendez, A. Medel, P. Mijaylova, I. Robles, F. Rodriguez-Valadez, L. A. Godinez, Y. Meas
Summary: Photo-electrocoagulation with aluminum electrodes is an effective method for degrading low concentration levels of organic pollutants, due to its ability to produce highly reactive oxygen species such as (OH)• radicals. The production of (OH)• radicals is influenced by operating parameters, with the highest concentration observed at pH 3.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Review
Environmental Sciences
C. Martinez-Sanchez, I. Robles, L. A. Godinez
Summary: This paper reviews recent advances in electrochemical advanced oxidation processes (EAOPs) for treating effluents contaminated with dyes, pharmaceuticals, and pesticides. The effectiveness of EO, EF, and PA-EF processes varies for different organic contaminants, with EO being more efficient for simpler molecules and EF/PA-EF being more suitable for complex molecules.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
J. C. Cruz, S. M. Hernandez, D. L. Trejo-Arroyo, Z. Zarhri, J. Zarate-Medina, Luis F. Jimenez, M. P. Gurrola
Summary: The study explored the self-healing process in concrete using limestone coarse aggregate impregnated with sodium silicate solution encapsulated with PVA. It enhanced compressive strength by up to 50% and reduced absorption ranges by 4%. XRD analysis identified crystalline phases and SEM visualized hydration products in the healing process.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Chemistry, Applied
M. C. Cortez-Trejo, J. D. Figueroa-Cardenas, D. Quintanar-Guerrero, D. K. Baigts-Allende, J. Manriquez, S. Mendoza
Summary: This study discusses the development of new acid-induced mixed hydrogels based on amaranth proteins and xanthan gum, and investigates the influence of pH and protein-polysaccharide ratio on gel properties. The results show that proteins form electrostatic hydrogels with xanthan gum at pH < pI (4.0), and cross-linked soft hydrogels at pH > pI (5.5) due to incompatibility between charged biopolymers. The gel properties differ between pH conditions, with the electrostatic hydrogels at pH 4.0 showing more aggregated and stronger structures.
FOOD HYDROCOLLOIDS
(2022)
Article
Chemistry, Applied
M. C. Cortez-Trejo, G. Loarca-Pina, J. D. Figueroa-Cardenas, J. Manriquez, S. Mendoza
Summary: This study investigates the effect of pH and protein-polysaccharide ratio on the interactions and properties of food hydrogels based on BPI and XG. The results show that hydrogels with ratios of 1:1-3:1 at pH 4.0 have more compact and stronger gel structures, while hydrogels at pH 4.5 have higher water holding capacity.
FOOD HYDROCOLLOIDS
(2022)
Article
Construction & Building Technology
D. Castillo, J. C. Cruz, D. L. Trejo-Arroyo, E. M. Muzquiz, Z. Zarhri, M. P. Gurrola, R. E. Vega-Azamar
Summary: This study investigates the possibility of using poultry litter ash as a supplementary cementing material, and examines its physicochemical and microstructural properties. The results show that poultry litter ash calcined at 800°C exhibits high activity and compressive strength.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Electrochemistry
Jorge A. Banda-Aleman, Michelle Camacho-Callejas, Maria L. Salazar-Lopez, Irma Robles, Gustavo Acosta-Santoyo, Josue D. Garcia-Espinoza, Francisco J. Rodriguez-Valadez, Juan Manriquez, Luis A. Godinez
Summary: Carbon felt electrodes (CF) were modified with different amounts of Fe0 (C|Fe) using a potentiostatic electrodeposition technique. The materials were characterized and analyzed using SEM, CV and chemical titration experiments. By polarizing the Fe modified CF substrates at different potential values, the electro-Fenton production of center dot OH radicals can be promoted, making them potentially suitable for single electrode EF batch reactors.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Ana Daniela Azua-Humara, Carolina Martinez-Sanchez, Irma Robles, Josue Daniel Garcia-Espinoza, Maria L. Salazar-Lopez, Karen Esquivel, Luis A. Godinez
Summary: By using the dip-coating technique, a plastic optical fiber (POF) photo-anode was coated with a mixture of titanium oxide nanoparticles (TiO2:Ti4O7). The coated material allowed UV radiation to escape along the fiber, exciting the semiconductor film and degrading pollutant chemicals in water. The TiO2:Ti4O7-coated POF showed a synergistic effect under UV light and electrical polarization, making it a potential candidate for novel photo-electrochemical arrangements in water treatment.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
M. P. Gurrola, J. C. Cruz, F. I. Espinosa-Lagunes, A. Martinez-Lazaro, J. Ledesma-Garcia, L. G. Arriaga, R. A. Escalona-Villalpando
Summary: This study presents a promising method for power generation in direct urea microfluidic fuel cells (DU mu FC) by using urine/urea oxidation reaction through catalysts with a higher performance. The evaluation of urine samples as fuel in an air-breathing microfluidic fuel cell is carried out by optimizing parameters such as urea, KOH and H2SO4 concentration, and flux rate. The electrochemical results demonstrate the successful generation of energy from urine by dispersing and attaching the Pd/rGo catalyst mixed with Nafion (R) in the anodic compartment.
Article
Materials Science, Multidisciplinary
R. Garcia-Estrada, A. Hernandez-Palomares, Yadira G. Maldonado, J. Manriquez, F. Espejel Ayala
Summary: This work studied the thermal stability of SAPO-34 and proposed a new experimental method for preparing a metal-loaded catalyst. The preparation and characterization of the Ag/SAPO-34 catalyst were carried out by incorporating Ag during the hydrothermal synthesis of the zeolite, followed by thermal treatment. Various analysis techniques were employed to demonstrate the characteristics of the Ag/SAPO-34 structure and showed that the sample reduced with hydrogen exhibited activity in the visible region. This work provides a procedure to obtain a photocatalyst useful in the visible region, potentially replacing TiO2 photocatalyst in wastewater treatment.
FUNCTIONAL MATERIALS LETTERS
(2023)
Review
Environmental Sciences
Josue D. Garcia-Espinoza, Jose Trevino-Resendez, Irma Robles, Gustavo Acosta-Santoyo, Luis A. Godinez
Summary: This review provides a comprehensive perspective of sono-electro-Fenton-related processes applied for real wastewater treatment. It discusses the effectiveness of homogeneous and heterogeneous electro-Fenton approaches, the fundamentals of ultrasound-based processes, and the coupling of the two methods for real wastewater treatment and the effect of process parameters. Sono-electro-Fenton processes substantially increase the treatment efficiency and biodegradability of the wastewater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)