Papers by Messaoud Hachemi
DESALINATION AND WATER TREATMENT, 2019
Municipal sewage sludge and FeSO 4 •7H 2 O were mixed and calcined at 350°C to prepare a catalyst... more Municipal sewage sludge and FeSO 4 •7H 2 O were mixed and calcined at 350°C to prepare a catalyst (SS-Fe-350) via a one-step synthesis. The catalyst was used to degrade methylene blue (MB) in an aqueous solution. The influence of initial solution pH, catalyst dosage, H 2 O 2 dosage and temperature on MB degradation was investigated. The MB removal mechanism was explored and the stability of the SS-Fe-350 was assessed. The results showed that MB removal could reach 98% under optimal conditions, that is, initial solution pH 4.0, catalyst dosage 1 g L-1 , H 2 O 2 dosage 1 mL L-1 , and temperature 25°C. A multi-cycle experiment showed that the SS-Fe-350 had a good removal effect over several usage cycles. The MB removal efficiency remained >60% after three cycles. The main MB removal mechanism was free-radical reaction, in which hydroxyl radicals were generated between H 2 O 2 and SS-Fe-350 through the heterogeneous Fenton reaction. Meanwhile, some Fe ions were dissolved during the MB degradation process and induced the homogeneous Fenton reaction. However, the heterogeneous Fenton reaction was the main mechanism for MB degradation. Therefore, municipal sludge can be used to synthesize an effective catalyst for the removal of dyes from wastewater through the heterogeneous Fenton reaction.
Journal of Hazardous Materials, Aug 1, 2008
ChemInform, Aug 17, 2010
indole derivatives, isoindole derivatives indole derivatives, isoindole derivatives R 0140 48-112... more indole derivatives, isoindole derivatives indole derivatives, isoindole derivatives R 0140 48-112 Potassium Fluoride on Alumina: Dry Synthesis of 3-Arylidene-1,3-dihydro-indol-2-one under Microwave Irradiation.-Dry condensation of aldehydes or ketones (IV) with 1,3-dihydroindolone (I) in the presence of KF on alumina under focused microwave irradiation provides a fast and convenient method for the preparation of the title 3-arylideneindolones in generally good yields.
ChemInform, Aug 4, 2010
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Synthetic Communications, May 1, 1994
... Didier Villemin,* Frederic Thibault-Starzyka and Messaoud Hachemi, Ecole Nationale Supkrieure... more ... Didier Villemin,* Frederic Thibault-Starzyka and Messaoud Hachemi, Ecole Nationale Supkrieure d'lngknieurs de Caen, ISMRA, URA480 CNRS, F-14050 Caen Cedex, France. ... 18 Hz) ; MS m/z (%) : 339 (M+, 36), 311 (24), 210 (49), 202 (53, 174 (14), 147 (47), 66 (100). ...
Algerian Journal of Environmental Science and Technology, 2020
Methane concentration in the atmosphere has critically increased recently, its account for about ... more Methane concentration in the atmosphere has critically increased recently, its account for about 50% of the greenhouse gases (GHG) emissions. Increasing environmental concern and global warming have made it become an imminent consideration. The energy sector is the second largest contributor to methane emissions. The emissions of natural gas from gas transportation pipeline are an important factor for global warming. For this article we try find a way for preventing of waste this source because of economical aspect and environmental problems. First we calculate the volume of gas venting from pipeline and then get quantity of money value of this gas then we suggest a mobile compressor for saving this gas. Pipeline pump-down technique with portable compressor solution instead of venting will mainly allow 54.873 million m3 gases saving, which costs about 11.628 million USD and benefits justified purchase of 4 portable compressors.
Asian Journal of Chemistry, 2016
Metallic trace elements (MTE) are chemical elements having a density more than 5 g/cm 3 and, atom... more Metallic trace elements (MTE) are chemical elements having a density more than 5 g/cm 3 and, atomic weights between 63.5 and 200.6 [1]. The discharge of waste water loaded with heavy metals in the environment increases with the fast development of various industries such as metal plating facilities, mining operations, fertilizer industries, tanneries, batteries, paper industries and pesticides, etc. Because of their non-biodegradability, heavy metals have a tendency to be accumulating in living organisms. The heavy metals most often considered toxic to humans are lead, mercury, arsenic and cadmium. Others, such as copper, zinc, chromium, yet needed by the body in small amounts, can be toxic in larger doses. Zinc is a trace element necessary for the metabolism of living beings, essential for many metallo enzymes and transcription factors that are involved in various cellular processes such as gene expression, signal transduction, transcription and replication. On the other hand, an excess of zinc can cause significant health problems, such as stomach cramps, skin irritations, vomiting, nausea and anemia [2]. Copper is an essential element in humans and animals (trace element), involved in many metabolic pathways, particularly for hemoglobin formation and maturation of neutrophils. However, the excess copper can cause severe toxicological preoccupations such as vomiting, cramps, convulsions, or even death [3].
Journal of Hazardous Materials, 2008
The Journal of Engineering Research, 2018
This paper investigates the combustion of the urban sewage sludge from 550 to 1000˚C with the aim... more This paper investigates the combustion of the urban sewage sludge from 550 to 1000˚C with the aim of studying the evolution that occurs on the composition of the sewage sludge during the heat treatment process. Several analyses have been carried out: pH, X-ray fluorescence, and atomic absorption spectrometry. The results of the experiments indicate that increasing the temperature increases the basic character, the amount of major and minor elements in the obtained sewage sludge ash. These phenomena are due to the richness of the sludge in the organic matter, which led to a considerable volume reduction when the sludge was combusted. The X-ray fluorescence analysis of the sewage sludge ash showed an increase in the amount of aluminosilicates, which constitute the reactive part in a pozzolanic material. The atomic absorption spectrometer analysis of the heavy metals in the ash showed that their respective concentrations depend on their melting and boiling points. The calcium carbonate...
Received : 11/05/2015 Accepted : 15/06/2015 The increasing quantities of sewage sludge from waste... more Received : 11/05/2015 Accepted : 15/06/2015 The increasing quantities of sewage sludge from wastewater treatment plants are a great source of worry especially concerning their impact on the environment. Managing such sludge is the basis for a successful general sanitation scheme. The present work subject matter is the evaluation of pollutants present in the sewage sludge recovered from urban wastewater treatment plant of the town of Boumerdès, Algeria, which is treated wastewater from three (03) towns: Boumerdes – Corso – Tidjelabine. For this study, we followed the evolution of some physical and chemical parameters such as the concentration of trace metals which we have analysed mineralogically through the use of X-ray fluorescence and then compared to the French standard NF U 44-041. The NF U 44-041 standard concerns the reuse of sewage sludge as fertilizer in land application. Several sewage sludge samples have been analysed in the present work. The analysis of the sewage sludge ...
: Metal elements in ash and flue gas emission samples, generated by an incineration plant of clin... more : Metal elements in ash and flue gas emission samples, generated by an incineration plant of clinical and industrial waste, were investigated at the sole incineration waste plant currently operating in Northern Algeria. We studied the incineration of several types of waste like wastewater treatment plant sludge, expired pharmaceuticals and clinical waste. For each of them, we collected samples of flue gas particulates and ashes after incineration. The characterization of the metal elements associated with the ash and flue gas particulates was carried out by X-Ray Fluorescence analysis (XRF). Flue gas results indicated that the emission concentrations of the regulated metal elements, expressed in mg Nm-3, were in the range of 0.0004 – 0.4090 for Sb+As+Pb+Cr+Co+Cu+Mn+Ni+V+Sn and 0.0005 to 0.1540 for the total of Cd+Ti, while for the regulated toxic metal elements in ash related to the recovery, maturation or storage of solid incineration residues; expressed in percentage, average lev...
Hexavalent chromium Cr(VI) is well known to be a toxic and non-biodegradable contaminant and can ... more Hexavalent chromium Cr(VI) is well known to be a toxic and non-biodegradable contaminant and can cause significant environmental damage if it is not eliminate from wastewater. However, it can be reduced to Cr(III), which is less toxic by photocatalysis process using the heterosystem NiAl2O4/ZnO. NiAl2O4 prepared by nitrate method crystalize in a spinel structure and was characterized, by XRD, FTIR, and SEM techniques. NiAl2O4 acts as electrons pump and the electron transfer to chromate is mediated via ZnO. Under the optimized conditions, the percentage of Cr(VI) reduction was 62 % for 20 mg/L, NiAl2O4/ZnO ratio (1/1) at pH~3.7 and under visible light. An improvement up to 72% was obtained when the reaction occurs in a Rishton reactor with six bleds after 6 h illumination. It is therefore concluded that the Cr(VI) photocatalytic reduction followed a pseudo first order kinetic model, in agreement with the Langmuir– Hinshelwood mechanism. This work revealed that the NiAl2O4/ZnO heteros...
Journal of Wood Chemistry and Technology, 2021
Abstract The result of this study is the chemical characterization of sapwood (SW) and heartwood ... more Abstract The result of this study is the chemical characterization of sapwood (SW) and heartwood (HW) of Fraxinus angustifolia native to Algeria. Lipophilic and hydrophilic extractives were isolated by means of an accelerated solvent extractor (ASE) using hexane and the acetone/water mixture respectively. The acid hydrolysis and methanolysis methods were used to determine cellulose and hemicelluloses contents. The Tappi Standards T 222 and UM 250 allowed Klason and acid-soluble lignin quantification respectively. Alkaline hydrolysis of wood samples followed by HPLC analysis was performed to determine the acetyl groups. The method detailed in TAPPI T 211 (2002) for determining the ash content was used. It was found that the SW and HW of Fraxinus A. had almost similar amounts of the main components, averaging 40.00 wt% cellulose, 28.00 wt% hemicelluloses within 18.00 wt% of xylan, 22.00 wt% lignin, 3% extractives and 0.83 wt% ash. However, the HW contained more triglycerides (0.08 wt%) than the SW (0.02 wt%). On the other hand, mannitol was the most predominant hydrophilic extractive in SW (1.60 wt%) than in HW (1.02 wt%). These findings are useful for practitioners in the paper, biofuel, cosmetics, food, pharmaceutical and chemical industries for the assessment of Fraxinus A. wood chemical treatment parameters.
Euro-Mediterranean Journal for Environmental Integration, 2021
In our study, the effectiveness of photocatalytic degradation of methyl orange (MO) in the presen... more In our study, the effectiveness of photocatalytic degradation of methyl orange (MO) in the presence of several catalysts under simulated solar light was studied. A comparative study was conducted between four different catalysts (TiO2, Cu2O, WO3, and Bi2O3) to assess their photocatalytic activities by varying the illumination time. The photodegradation was examined through quantification of the photogenerated reactive oxygen species (ROS). In situ photogenerated hydroxyl radicals (⦁OH) were detected with terephthalic acid (TA) dosimetry based on fluorescence spectroscopy. Therefore, the concentration of ⦁OH was expressed according to the relative fluorescence intensity. Moreover, proof of a nonlinear relationship connecting the kinetics of the photocatalytic degradation of MO and the generation of ⦁OH radicals was demonstrated using coefficients of determination (R2). This brought new insights regarding the mechanism of the photocatalytic activity. Our findings indicate that the generated ⦁OH radicals from heterogeneous photocatalytic systems are not the unique factor involved in organic pollutant elimination; the double metal structure of metal oxides should also be taken into consideration.
Environmental Engineering and Management Journal, 2021
Heterogeneous oxidation system for the removal of azo-food dye from aqueous solution was studied ... more Heterogeneous oxidation system for the removal of azo-food dye from aqueous solution was studied in the presence of CuO/Al2O3 catalyst. This catalyst was prepared by impregnation method using a cupric salt solution at pH=5, followed by calcination at 450 °C. The result catalyst was characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDX), where the results confirmed a high crystallinity, good chemical stability of the catalyst used in four consecutive cycles and the presence of the elements (Cu, O, Al) composing the catalyst. Several parameters affecting dye degradation such as: solution pH, H2O2 concentration, catalyst dose, and reaction temperature were investigated. CuO/Al2O3 catalyst offers higher activation efficiencies than the homogeneous Cu 2+ ions, as well as good operational stability and efficiently generate HO • in neutral aqueous solutions. Complete decolorization (100 %) of Carmoisine (500 mg/L) was achieved in 240 min at neutral pH.
Environment Protection Engineering, 2016
Chemical transformation of leather waste into chromium free biomass has been investigated. The co... more Chemical transformation of leather waste into chromium free biomass has been investigated. The conversion was performed by extracting the toxic metal. The effects of several influential factors on the process have been studied using design of experiments. Optimal conditions of chromium extraction have been determined. The collagen fiber of the biomass obtained has been analyzed by the Fourier transform infrared spectroscopy (FTIR). The chemical mechanism allowing this transformation has been suggested. The infrared analysis showed that the collagen fiber of the obtained biomass presents chemical composition similar to that of native collagen fiber of non-chromed leather. These results demonstrated the almost complete extraction of chromium from leather waste and the conversion of these latter into an environmentally harmless biomass.
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Papers by Messaoud Hachemi