A5064125029- Environmental remediation with nanomaterials
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- Advanced oxidation water treatment
- Water Treatment and Disinfection
- Analytical Chemistry and Sensors
- Arsenic contamination and mitigation
- Liquid Crystal Research Advancements
- Bioactive Compounds and Antitumor Agents
- Adsorption and biosorption for pollutant removal
- Conducting polymers and applications
- Wastewater Treatment and Reuse
- Protein Interaction Studies and Fluorescence Analysis
- Natural Compound Pharmacology Studies
- Parkinson's Disease Mechanisms and Treatments
- Proteins in Food Systems
- Advanced battery technologies research
- Advanced biosensing and bioanalysis techniques
- Ammonia Synthesis and Nitrogen Reduction
- Radioactive element chemistry and processing
- Surfactants and Colloidal Systems
- Lanthanide and Transition Metal Complexes
- Urban Stormwater Management Solutions
- Folate and B Vitamins Research
- Metal-Catalyzed Oxygenation Mechanisms
Laboratoire de Chimie
2003-2022
Université de Yaoundé I
1995-2022
University of Douala
2010-2021
Université de Sherbrooke
2017
Chimie ParisTech
2012
Researchers on metallic iron (Fe0) for environmental remediation and water treatment are walking in a valley of confusion 25 years. This is characterized by the propagation different beliefs that have resulted from partial analysis Fe0/H2O system as (1) reductive chemical reaction was considered an electrochemical one (2) mass balance has not been really addressed. The turn undermining scientific method while discouraging any real critical argumentation. communication re-establishes complex...
This study characterizes the decrease of hydraulic conductivity (permeability loss) a metallic iron-based household water filter (Fe0 filter) for duration 12 months. A commercial steel wool (SW) is used as Fe0 source. The unit containing 300 g SW was sandwiched between two conventional biological sand filters (BSFs). working solution slightly turbid natural well polluted with pathogens (total coliform = 1950 UFC mL−1) and contaminated nitrate ([NO3−] 24.0 mg L−1). system monitored twice per...
Continuous gravity-fed column experiments using the methylene blue (MB) discoloration method were performed to characterize suitability of a pozzolan (PZ) specimen as alternative admixing aggregate for metallic iron filters (Fe0-filters). Investigated systems were: (i) pure sand, (ii) PZ, (iii) Fe0, (iv) Fe0/sand, (v) Fe0/PZ, and (vi) Fe0/sand/PZ. The volumetric proportion Fe0 was 25%. proportions Fe0/sand/PZ system 25/45/30. initial MB concentration 2.0 mg·L−1, 6.0 g used, lasted 46 days....
There are many factors to consider for the design of appropriate water treatment systems including: cost, concentration and type biological and/or chemical contamination, limits at which contaminant(s) required be removed, flow rate, level local expertise on-going maintenance, social acceptance. An ideal technology should effective producing clean, potable water; however it must also low-cost, low-energy (ideally energy-free) require low-maintenance. The use packed beds containing metallic...
Studies were undertaken to determine the reasons why published information regarding efficiency of metallic iron (Fe0) for water treatment is conflicting and even confusing. The reactivity eight Fe0 materials was characterized by Fe dissolution in a dilute solution ethylenediaminetetraacetate (Na2–EDTA; 2 mM). Both batch (4 days) column (100 experiments used. A total 30 different systems extent release EDTA. effects type (granular iron, nails steel wool) pretreatment procedure (socking...
Metallic iron (Fe0) has been demonstrated as an excellent material for decentralized safe drinking water provision, wastewater treatment and environmental remediation. An open issue all these applications is the rational selection or quality assurance. Several methods assessing Fe0 have presented, but of them are limited to characterizing its initial reactivity. The present study investigates H2 evolution in acidic solution (pH 2.0) alternative method, while comparing achieved results those...
Abstract At room temperature, tetraoctylphosphonium bromide is a viscous ionic liquid, this gel‐like organic phase can be cast over basal‐plane graphite electrode (BPGE). Cyclic voltammetry at such modified electrode, in contact with an aqueous solution have revealed one reversible oxidation and five reduction steps for Lu III bisphthalocyanine dissolved the liquid film, proof that highly reactive reduced species were protected from interaction water lipophilic phase. It has also been shown...
Cyclic and square wave voltammetries have been used to study electrochemical behaviour of an anti-HIV agent (Guttiferone A) at the liquid-liquid interface. The thin organic membrane is formed by solvent containing redox probe. Guttiferone A, a benzophenone (BP) with appropriate electrolyte. It demonstrated that BP possesses three reduction systems due transformation tautomeric forms lead migration proton between hydroxyl group in position 4 carbonyl positions 2 10. transfer from aqueous...
The electrochemical behavior of the substituted nitrocyclopropanes 3 (n = 1) as well nitrophenylcyclopropanes 7 have been studied at a Pt electrode by cyclic voltammetry, microcoulometry, and preparative electrolysis in DMF-(n-Bu)4PF6. Electroreduction 8 consumes one electron to give radical anion 8•−, which undergoes homolytic C-N bond cleavage leading formation corresponding cyclopropyl nitrite ion. 11 2 electrons. 11•− is formed first followed C-C (homolytic and/or heterolytic)...