Pub Date : 2021-11-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.26577
Jihane Kouar, Touria Ould Bellahcen, A. Elamrani, A. Chérif, N. Kamil
Calcium phosphate tricalcic apatitic (CaPT-Ap) was synthesized by co-precipitation at low temperature and basic medium. The potential of CaPT-Ap as an adsorbent was investigated in a batch reactor under different experimental conditions for removing dye Eriochrome Black T (EBT) from aqueous solutions. The used adsorbent was characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR) and chemical analysis indicate that this calcium phosphate is a CaPT-Ap. The effect of particle sizes , mass of the adsorbent, contact time ,temperature and the concentration of the dye on the adsorption were determined. The kinetic study showed that the pseudo-second-order model gives a better description of the kinetics of the adsorption reaction than the pseudo-first-order model. Analysis of adsorption isotherms showed that adsorption governed by the isotherms of Freundlich. Thermodynamic parameters such as ΔG°, ΔS° and ΔH° were calculated. It was found that EBT dye adsorption was spontaneous and endothermic.
{"title":"Removal of Eriochrome Black T dye from aqueous solutions by using nano-crystalline calcium phosphate tricalcic apatitic","authors":"Jihane Kouar, Touria Ould Bellahcen, A. Elamrani, A. Chérif, N. Kamil","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.26577","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.26577","url":null,"abstract":"Calcium phosphate tricalcic apatitic (CaPT-Ap) was synthesized by co-precipitation at low temperature and basic medium. The potential of CaPT-Ap as an adsorbent was investigated in a batch reactor under different experimental conditions for removing dye Eriochrome Black T (EBT) from aqueous solutions. The used adsorbent was characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR) and chemical analysis indicate that this calcium phosphate is a CaPT-Ap. The effect of particle sizes , mass of the adsorbent, contact time ,temperature and the concentration of the dye on the adsorption were determined. The kinetic study showed that the pseudo-second-order model gives a better description of the kinetics of the adsorption reaction than the pseudo-first-order model. Analysis of adsorption isotherms showed that adsorption governed by the isotherms of Freundlich. Thermodynamic parameters such as ΔG°, ΔS° and ΔH° were calculated. It was found that EBT dye adsorption was spontaneous and endothermic.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42787538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.25910
N. Bahammou, R. Raja, I. Carvalho, K. Cherifi, H. Bouamama, O. Cherifi
Totally seventeen seaweeds (nine Phaeophyceae, six Rhodophyceae and two Ulvophyceae members) were collected from the Atlantic coast of Morocco in order to assess their antifungal and antioxidant activities. The crude methanolic extracts of 30 samples were screened for in vitro antifungal activities against phytopathogenic fungi Botrytis cinerea and Penicillium digitatum that infect fruits and vegetables. The methanolic extracts of Carpodesmia tamariscifolia , Cystoseira humilis , Carpodesmia mediterranea, Sacchoriza polyschides , Bifurcaria bifurcata , Hypnea musciformis and Caulacanthus ustulatus were considerably active against all fungi depending on seasonal variations in the levels of inhibitory activity. B. cinerea was highly sensitive to most algal extracts than P. digitatum . Phytochemical screening revealed that the most active extracts contain alkaloids, polyphenols and tannins. The antioxidant activity of the algae that possessed high antifungal activity was studied. Methanolic extract of C. tamariscifolia contains high phenolic content while the highest content of flavonoids was found in the C. humilis extract. The organic farming in the context of sustainable agriculture may use such natural products for the management of fungal diseases. With respect to such alternative in an integrated crop disease management program, further studies on these seaweeds are needed.
{"title":"Assessment of the Antifungal and Antioxidant Activities of the Seaweeds Collected from the Coast of Atlantic Ocean, Morocco","authors":"N. Bahammou, R. Raja, I. Carvalho, K. Cherifi, H. Bouamama, O. Cherifi","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.25910","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.25910","url":null,"abstract":"Totally seventeen seaweeds (nine Phaeophyceae, six Rhodophyceae and two Ulvophyceae members) were collected from the Atlantic coast of Morocco in order to assess their antifungal and antioxidant activities. The crude methanolic extracts of 30 samples were screened for in vitro antifungal activities against phytopathogenic fungi Botrytis cinerea and Penicillium digitatum that infect fruits and vegetables. The methanolic extracts of Carpodesmia tamariscifolia , Cystoseira humilis , Carpodesmia mediterranea, Sacchoriza polyschides , Bifurcaria bifurcata , Hypnea musciformis and Caulacanthus ustulatus were considerably active against all fungi depending on seasonal variations in the levels of inhibitory activity. B. cinerea was highly sensitive to most algal extracts than P. digitatum . Phytochemical screening revealed that the most active extracts contain alkaloids, polyphenols and tannins. The antioxidant activity of the algae that possessed high antifungal activity was studied. Methanolic extract of C. tamariscifolia contains high phenolic content while the highest content of flavonoids was found in the C. humilis extract. The organic farming in the context of sustainable agriculture may use such natural products for the management of fungal diseases. With respect to such alternative in an integrated crop disease management program, further studies on these seaweeds are needed.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44980010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.28018
K. Abbi, L. Hermouch, Y. Elhamdouni, N. Labjar, A. Skalli, I. Merimi, F. Jeffali, M. E. Mahi, El M. Lotfia, S. Hajjaji
The detection of Cd 2+ ions was studied by cyclic voltammetry (CV) and Square Wave Voltammetry (SWV). This method is mainly based on the accumulation of Cd 2+ ions on the surface of a carbon paste electrode modified by coal extract from argan oilcake waste (AC-CPE). To evaluate the detection performance of AC-CPE against Cd 2+ ions, an optimization study was carried out to determine the following optimal conditions, pH=5, preconcentration time of 120s, and deposition potential of 1.2V. Under these optimal conditions, a linear relationship between current peak intensity and concentration has been defined over a concentration range from 5.10 -4 to 5.10 -7 M; with detection limit (DL, 3 б) of 3.04x10 -6 M. An analytical application of the electrode in a real matrix, tap water, was performed and revealed good detection performance of AC-CPE. These results show that the AC-CPE can be used as an excellent detector of Cd 2+ ions in aqueous solution
{"title":"Detecting cadmium(II) by using coal extracted from argan oilcake waste (Argania spinosa) as modifier of carbon paste electrode.","authors":"K. Abbi, L. Hermouch, Y. Elhamdouni, N. Labjar, A. Skalli, I. Merimi, F. Jeffali, M. E. Mahi, El M. Lotfia, S. Hajjaji","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.28018","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.28018","url":null,"abstract":"The detection of Cd 2+ ions was studied by cyclic voltammetry (CV) and Square Wave Voltammetry (SWV). This method is mainly based on the accumulation of Cd 2+ ions on the surface of a carbon paste electrode modified by coal extract from argan oilcake waste (AC-CPE). To evaluate the detection performance of AC-CPE against Cd 2+ ions, an optimization study was carried out to determine the following optimal conditions, pH=5, preconcentration time of 120s, and deposition potential of 1.2V. Under these optimal conditions, a linear relationship between current peak intensity and concentration has been defined over a concentration range from 5.10 -4 to 5.10 -7 M; with detection limit (DL, 3 б) of 3.04x10 -6 M. An analytical application of the electrode in a real matrix, tap water, was performed and revealed good detection performance of AC-CPE. These results show that the AC-CPE can be used as an excellent detector of Cd 2+ ions in aqueous solution","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44926213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-31DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.28836
F. Mejbar, Y. Miyah, A. Lahrichi, S. Ssouni, A. Khalil, L. Nahali, M. Benjelloun, G. E. Mouhri, F. Zerrouq
This work aimed to study the remarkable catalytic performance of fishbone (FB) doped copper (Cu) synthesized by the impregnation method for crystal violet (CV) dye’s catalytic wet hydrogen peroxide oxidation (CWPO). The catalysts (x%Cu-FB) prepared were characterized by several techniques such as the X-ray diffraction (XRD), the Fourier transformed infrared spectroscopy (FTIR), the zero point charge measurement (pH zpc ), and the scanning electron microscopy (SEM) coupled by the energy-dispersive X-ray spectroscopy (EDX). In addition, this catalysis (x%Cu-FB) was employed as heterogeneous catalysts for CWPO of crystal violet dye removal using different parameters effects in particular the percentage of metallic precursor Cu, the catalyst amount, the concentration of CV dye, the hydrogen peroxide H 2 O 2 concentration, the temperature, the pH solution. The discolorization rate efficiency was boosted from 98% for 1% Cu-FB after only 35 min of reaction with the optimum conditions namely pH=10, [CV] = 20 mg L -1 , [H 2 O 2 ] =0.048 mol L -1 , W Cu-FB = 2 g L -1 and T=50°C. Finally, it can be seen from this study that the oxidation process by a fishbone catalyst could be economical and effective in removing a large part of the textile pollutants (CV dye) existing in industrial wastewater. The scope of the study makes this method a clean alternative that fits into a perspective of sustainable development.
本工作旨在研究浸渍法合成的鱼骨（FB）掺杂铜（Cu）对结晶紫（CV）染料催化湿式过氧化氢氧化（CWPO）的显著催化性能。通过x射线衍射（XRD）、傅立叶变换红外光谱（FTIR）、零点电荷测量（pH zpc）和能量色散x射线光谱（EDX）耦合的扫描电子显微镜（SEM）等技术对制备的催化剂（x%Cu-FB）进行了表征。此外，采用该催化剂（x%Cu-FB）作为CWPO去除结晶紫染料的多相催化剂，使用不同的参数影响，特别是金属前体Cu的百分比、催化剂用量、CV染料的浓度、过氧化氢H2 O2浓度、温度、pH溶液。在pH=10，[CV]=20mg L-1，[H2O2]=0.048 mol L-1，W Cu FB=2g L-1和T=50°C的最佳条件下，1%Cu FB的脱色率从98%提高到98%。最后，从本研究中可以看出，鱼骨催化剂的氧化过程可以经济有效地去除工业废水中存在的大部分纺织污染物（CV染料）。研究的范围使这种方法成为一种干净的替代方法，符合可持续发展的观点。
{"title":"Remarkable CWPO of crystal violet dye removal using the fishbone doped of copper synthesized by impregnation method","authors":"F. Mejbar, Y. Miyah, A. Lahrichi, S. Ssouni, A. Khalil, L. Nahali, M. Benjelloun, G. E. Mouhri, F. Zerrouq","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.28836","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.28836","url":null,"abstract":"This work aimed to study the remarkable catalytic performance of fishbone (FB) doped copper (Cu) synthesized by the impregnation method for crystal violet (CV) dye’s catalytic wet hydrogen peroxide oxidation (CWPO). The catalysts (x%Cu-FB) prepared were characterized by several techniques such as the X-ray diffraction (XRD), the Fourier transformed infrared spectroscopy (FTIR), the zero point charge measurement (pH zpc ), and the scanning electron microscopy (SEM) coupled by the energy-dispersive X-ray spectroscopy (EDX). In addition, this catalysis (x%Cu-FB) was employed as heterogeneous catalysts for CWPO of crystal violet dye removal using different parameters effects in particular the percentage of metallic precursor Cu, the catalyst amount, the concentration of CV dye, the hydrogen peroxide H 2 O 2 concentration, the temperature, the pH solution. The discolorization rate efficiency was boosted from 98% for 1% Cu-FB after only 35 min of reaction with the optimum conditions namely pH=10, [CV] = 20 mg L -1 , [H 2 O 2 ] =0.048 mol L -1 , W Cu-FB = 2 g L -1 and T=50°C. Finally, it can be seen from this study that the oxidation process by a fishbone catalyst could be economical and effective in removing a large part of the textile pollutants (CV dye) existing in industrial wastewater. The scope of the study makes this method a clean alternative that fits into a perspective of sustainable development.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47180827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-18DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.28145
Mohammed Elhoudi
The experimental study of the complexation of the two amino acids, L-canavanine, and L-arginine, with the mercuric ion Hg(II), was completed by the characterization by a quantum calculation based on the DFT method. This study covers electronic, energetic, and structural aspects in the neutral, deprotonated, and complexed states. The atomic net charges show that the active sites of the carboxyl, guanidyl, and amino groups are the oxygen and nitrogen atoms. In fact, the L-canavanine (Can) gave stable mercuric bidentate chelates via the amino and guanidyl groups. Hg(Can)(H 2 O) 2 , Hg(Can) 2 and Hg(OH)(H 2 O)(Can), while the L-arginine (Arg) resulted in engagement of carboxyl and amino groups to bidentate complexes: Hg(Arg)(H 2 O) 2 , Hg(Arg) 2 , Hg(Arg)(OH)(H 2 O). The metal-ligand coordination bond is more rigid with the guanidyl and carboxyl groups than with the amino group; and the bond formed with the amino group is more rigid in the L-canavanine than L-arginine.
{"title":"Quantum chemical approach (DFT) of the binary complexation of Hg(II) with L-canavanine and L-arginine.","authors":"Mohammed Elhoudi","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.28145","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.28145","url":null,"abstract":"The experimental study of the complexation of the two amino acids, L-canavanine, and L-arginine, with the mercuric ion Hg(II), was completed by the characterization by a quantum calculation based on the DFT method. This study covers electronic, energetic, and structural aspects in the neutral, deprotonated, and complexed states. The atomic net charges show that the active sites of the carboxyl, guanidyl, and amino groups are the oxygen and nitrogen atoms. In fact, the L-canavanine (Can) gave stable mercuric bidentate chelates via the amino and guanidyl groups. Hg(Can)(H 2 O) 2 , Hg(Can) 2 and Hg(OH)(H 2 O)(Can), while the L-arginine (Arg) resulted in engagement of carboxyl and amino groups to bidentate complexes: Hg(Arg)(H 2 O) 2 , Hg(Arg) 2 , Hg(Arg)(OH)(H 2 O). The metal-ligand coordination bond is more rigid with the guanidyl and carboxyl groups than with the amino group; and the bond formed with the amino group is more rigid in the L-canavanine than L-arginine.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48995013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-07DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.26974
Mohammed Moukhliss
The aquifer of the Berrechid plain is the most important of Morocco. He sustains many activities closely linked to regional and national socio-economic development (farming, industrial). High concentrations of chlorides, nitrates, electrical conductivity in the soil, and the risks to the environment and public safety are the subject of increased interest in the Berrechid aquifer. The main objective of this study was to analyze the quality of groundwater in the region of Berrechid. This region is subject to high agricultural and industrial activity.The mapping of physicochemical parameters was realized with ArcGIS Software, Version 10.3. These distribution maps were generated by Distance Weighted Inverse interpolation (DWI). For comparison analyses, the simplified groundwater quality grid was used. The physicochemical and bacteriological characterization of the Berrechid aquifer showed high values for electrical conductivity (EC) (7100 μS/cm), Chlorides (Cl - ) (2409 mg/l), nitrates (NO 3 - ) (190 mg/l), ammoniacal nitrogen (NH 4 + ) (0.02 mg/l), organic matter (OM) (4.55 mg/l), fecal coliforms (FC) (40000 UFC/100ml). Generally, the approaches developed in this work proved to be promising for real-time and low-cost groundwater quality prediction by using physicochemical parameters.
{"title":"Assessment of groundwater quality in Berrechid Aquifer, Morocco","authors":"Mohammed Moukhliss","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.26974","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.26974","url":null,"abstract":"The aquifer of the Berrechid plain is the most important of Morocco. He sustains many activities closely linked to regional and national socio-economic development (farming, industrial). High concentrations of chlorides, nitrates, electrical conductivity in the soil, and the risks to the environment and public safety are the subject of increased interest in the Berrechid aquifer. The main objective of this study was to analyze the quality of groundwater in the region of Berrechid. This region is subject to high agricultural and industrial activity.The mapping of physicochemical parameters was realized with ArcGIS Software, Version 10.3. These distribution maps were generated by Distance Weighted Inverse interpolation (DWI). For comparison analyses, the simplified groundwater quality grid was used. The physicochemical and bacteriological characterization of the Berrechid aquifer showed high values for electrical conductivity (EC) (7100 μS/cm), Chlorides (Cl - ) (2409 mg/l), nitrates (NO 3 - ) (190 mg/l), ammoniacal nitrogen (NH 4 + ) (0.02 mg/l), organic matter (OM) (4.55 mg/l), fecal coliforms (FC) (40000 UFC/100ml). Generally, the approaches developed in this work proved to be promising for real-time and low-cost groundwater quality prediction by using physicochemical parameters.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47738629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-07DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.25595
I. Mehdaoui
Intensive agriculture or phenomena such as pollution, compaction, and/or erosion lead to a decrease in the amounts of organic matter of soils; thus, causing a decrease in their fertility. The use of an organic amendment in agriculture could combat soil degradation. In this sense, two organic amendments with olives waste (OW) and olive mill wastewater (OMW) have been manufactured. The objective of this work is to examine the capacity of these amendments to improve soil quality in comparison with manure (M). Three types of soil were tested: the first has been amended for two years with a compost of similar composition (S 1 ), the second not amended (S 2 ), and the third corresponds to an agricultural soil that is amended with chemical fertilizer (S 3 ). All the trials were carried out on two vegetable gardens: potato and radish. The ANOVA shows that the amendment effect was highly significant on all the physicochemical parameters studied except humidity. In conclusion, this product could be an alternative to chemical fertilizers and considered as a perennial solution adapted to the context of sustainable development to the recovery of olive waste.
{"title":"What effects does an organic amendment to olive waste have on the soil and crop yield","authors":"I. Mehdaoui","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.25595","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.25595","url":null,"abstract":"Intensive agriculture or phenomena such as pollution, compaction, and/or erosion lead to a decrease in the amounts of organic matter of soils; thus, causing a decrease in their fertility. The use of an organic amendment in agriculture could combat soil degradation. In this sense, two organic amendments with olives waste (OW) and olive mill wastewater (OMW) have been manufactured. The objective of this work is to examine the capacity of these amendments to improve soil quality in comparison with manure (M). Three types of soil were tested: the first has been amended for two years with a compost of similar composition (S 1 ), the second not amended (S 2 ), and the third corresponds to an agricultural soil that is amended with chemical fertilizer (S 3 ). All the trials were carried out on two vegetable gardens: potato and radish. The ANOVA shows that the amendment effect was highly significant on all the physicochemical parameters studied except humidity. In conclusion, this product could be an alternative to chemical fertilizers and considered as a perennial solution adapted to the context of sustainable development to the recovery of olive waste.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43453655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-03DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.27828
A. Ziouche, A. Hammouda, N. Boucherou, M. Mokhtari, B. Hafez, H. Elmsellem, S. Abaidia
Abstract In this paper, Mo-CeO 2 conversion coating was developed to protect Aluminum 2024 alloy and Magnesium AZ31 alloy against corrosion. The cerium oxide was incorporated in Molybdenum conversion coating which is considered as a promising alternative to replace chromate compounds. The corrosion efficacy was improving and has been characterized by polarization curves and EIS measurements. The structural and the microstructural Mo-CeO 2 conversion coating was characterized by AFM, SEM and XRD and the mechanical proprieties was determined by nano indentation. The presence of molybdenum and oxide of cerium was confirmed with good physical and mechanical proprieties. The presence of CeO 2 in the conversion coating had a beneficial effect on the corrosion resistance of the both materials.
{"title":"Corrosion Protection Enhancement on Aluminum Alloy And Magnesium Alloy by Mo-CeO2 conversion coating","authors":"A. Ziouche, A. Hammouda, N. Boucherou, M. Mokhtari, B. Hafez, H. Elmsellem, S. Abaidia","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.27828","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.27828","url":null,"abstract":"Abstract In this paper, Mo-CeO 2 conversion coating was developed to protect Aluminum 2024 alloy and Magnesium AZ31 alloy against corrosion. The cerium oxide was incorporated in Molybdenum conversion coating which is considered as a promising alternative to replace chromate compounds. The corrosion efficacy was improving and has been characterized by polarization curves and EIS measurements. The structural and the microstructural Mo-CeO 2 conversion coating was characterized by AFM, SEM and XRD and the mechanical proprieties was determined by nano indentation. The presence of molybdenum and oxide of cerium was confirmed with good physical and mechanical proprieties. The presence of CeO 2 in the conversion coating had a beneficial effect on the corrosion resistance of the both materials.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46559157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-07DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.21954
E. Ezeh
Abstract This research investigated the Cone calorimetric analysis of the fire retardant properties of cow horn ash particles (CHAp) bio-additives and aluminium trihydrate (AH) in banana peduncle fibre reinforced polyester composites. Cone calorimeter was used to obtain combustion information of CHAp and AH control formulated composites. The analysis presented similar fire properties with CHAp incorporated composites exhibiting delayed ignition time of 25%, increased end of burning time of 14.24 per cent, and reduced total heat release rate of 9.07% for the developed composites. The developed BPF/CHAp/polyester produced composites of justified fire retardancy, which would find relevance in the engineering industries. CHAp incorporated in the developed composites presented valid fire-retardant properties compared with AH fire retardant additive composites used as the control and would suffice as an alternative to the expensive, non-environmental friendly fire retardants.
{"title":"Comparative Cone calorimetric analysis of the fire retardant properties of natural and synthetic additives in banana peduncle fibre reinforced polyester composites.","authors":"E. Ezeh","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.21954","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.21954","url":null,"abstract":"Abstract This research investigated the Cone calorimetric analysis of the fire retardant properties of cow horn ash particles (CHAp) bio-additives and aluminium trihydrate (AH) in banana peduncle fibre reinforced polyester composites. Cone calorimeter was used to obtain combustion information of CHAp and AH control formulated composites. The analysis presented similar fire properties with CHAp incorporated composites exhibiting delayed ignition time of 25%, increased end of burning time of 14.24 per cent, and reduced total heat release rate of 9.07% for the developed composites. The developed BPF/CHAp/polyester produced composites of justified fire retardancy, which would find relevance in the engineering industries. CHAp incorporated in the developed composites presented valid fire-retardant properties compared with AH fire retardant additive composites used as the control and would suffice as an alternative to the expensive, non-environmental friendly fire retardants.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48567049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-07DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.23587
S. Arhzaf, M. Bennani, S. Abouarnadasse, J. Houssaini, H. Ziyat, O. Qabaqous
Une serie de materiaux de type hydrotalcite Mg X Al-CO 3 , ou X correspond au rapport molaire nominal Mg / Al (X: 2, 2,5, 3 et 3,5), ont ete prepares et caracterises par fluorescence X (XRF ), X - diffraction des rayons (XRD), spectroscopie infrarouge (FT-IR) et analyse thermique (TG-DTA). L'oxyde mixte (Mg X Al-O) avec un rapport Mg / Al de 3,5 derive de l'hydrotalcite calcinee a 450 ° C s'est avere etre le catalyseur optimal qui peut donner la basicite la plus elevee et la plus grande activite catalytique pour la condensation aldolique sans solvant du furfural et de l'acetone. L'activite des hydrotalcites de Mg-Al calcine pour cette reaction etait correlee a leur basicite telle que determinee par l'adsorption de phenol. La meilleure conversion du furfural et la selectivite du furfural-acetone (FA) ont ete obtenues a 90 ° C apres 2 heures sur le Mg 3,5 Al-O avec 98% de conversion et une selectivite de 78% en (FA). L'activation pour la condensation d'aldol entre le furfural et l'acetone s'est averee etre de 24,8 KJ / mol en catalyze heterogene avec des hydrotalcites de Mg-Al calcine par rapport a la valeur augmentee en catalyze homogene avec NaOH qui etait de 55,8 KJ / mol.
制备了一系列水滑石Mg x Al-CO 3型材料，其中x对应于标称摩尔比Mg/Al（x:2、2.5、3和3.5），并通过x射线荧光（xRF）、x射线衍射（xRD）、红外光谱（FT-IR）和热分析（TG-DTA）进行了表征。混合氧化物（Mg x Al-O）的Mg/Al比为3.5，来源于450°C下的钙水滑石，被证明是最佳催化剂，可为糠醛和丙酮的无溶剂醛酸缩合提供最高碱度和最大催化活性。Mg-Al煅烧水滑石对该反应的活性与其通过酚吸附测定的碱度相关。糠醛的最佳转化率和糠醛丙酮（FA）的选择性在90°C下获得。在Mg 3.5 Al-O上2小时后，转化率为98%，对（FA）选择性为78%。糠醛和丙酮之间醛醇缩合的活化在Mg-Al钙水滑石的异质催化中为24.8kJ/mol，而在NaOH的同质催化中为55.8kJ/mol。
{"title":"Solvent-free aldol condensation of furfural and acetone on calcined Mg-Al hydrotalcites","authors":"S. Arhzaf, M. Bennani, S. Abouarnadasse, J. Houssaini, H. Ziyat, O. Qabaqous","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.23587","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.23587","url":null,"abstract":"Une serie de materiaux de type hydrotalcite Mg X Al-CO 3 , ou X correspond au rapport molaire nominal Mg / Al (X: 2, 2,5, 3 et 3,5), ont ete prepares et caracterises par fluorescence X (XRF ), X - diffraction des rayons (XRD), spectroscopie infrarouge (FT-IR) et analyse thermique (TG-DTA). L'oxyde mixte (Mg X Al-O) avec un rapport Mg / Al de 3,5 derive de l'hydrotalcite calcinee a 450 ° C s'est avere etre le catalyseur optimal qui peut donner la basicite la plus elevee et la plus grande activite catalytique pour la condensation aldolique sans solvant du furfural et de l'acetone. L'activite des hydrotalcites de Mg-Al calcine pour cette reaction etait correlee a leur basicite telle que determinee par l'adsorption de phenol. La meilleure conversion du furfural et la selectivite du furfural-acetone (FA) ont ete obtenues a 90 ° C apres 2 heures sur le Mg 3,5 Al-O avec 98% de conversion et une selectivite de 78% en (FA). L'activation pour la condensation d'aldol entre le furfural et l'acetone s'est averee etre de 24,8 KJ / mol en catalyze heterogene avec des hydrotalcites de Mg-Al calcine par rapport a la valeur augmentee en catalyze homogene avec NaOH qui etait de 55,8 KJ / mol.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48659232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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