Pub Date : 2021-08-07DOI: 10.48317/IMIST.PRSM/MORJCHEM-V9I3.21865
El Mostafa Erradi, A. Cherrat, K. Jaafari
This study aim to the preparation of three adsorbent natural materials: crude chitin, chitin and chitosan extracted from shellfish, to study the elimination of Chlorides from a synthetic effluent. The process of adsorption of chlorides on these supports is described following the linearized method of the model described by Freundlich and Langmuir. The study of the influence of some physico-chemical parameters on the dechlorination process has been undertaken.And in order to approach the conditions of water dechlorination, we were also interested in the study of the influence of the presence of the counter-ions on the ability to remove chloride ions on chitosan. Moreover, we looked for the optimal conditions of desorption using a basic solution.
{"title":"Study of dechlorination by natural adsorbents (chitin and chitosan)","authors":"El Mostafa Erradi, A. Cherrat, K. Jaafari","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.21865","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.21865","url":null,"abstract":"This study aim to the preparation of three adsorbent natural materials: crude chitin, chitin and chitosan extracted from shellfish, to study the elimination of Chlorides from a synthetic effluent. The process of adsorption of chlorides on these supports is described following the linearized method of the model described by Freundlich and Langmuir. The study of the influence of some physico-chemical parameters on the dechlorination process has been undertaken.And in order to approach the conditions of water dechlorination, we were also interested in the study of the influence of the presence of the counter-ions on the ability to remove chloride ions on chitosan. Moreover, we looked for the optimal conditions of desorption using a basic solution.","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":"45043045","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-V9I3.21663
K. Nwosu‐Obieogu, G. Dzarma, B. Okolo, K. N. Akatobi
Abstract This research investigated the efficiency of luffa cylindrica activated carbon as adsorbent material in the removal of iron (II) from the textile industry effluent in a batch adsorption experiment. The adsorption process was studied as a function of contact time, pH of the solution and adsorbent dosage. At room temperature, the batch adsorption experiment showed maximum adsorption of iron (II) at a pH of 6, a contact time of 60 minutes and an adsorbent dosage of 1g/L. The effluent was characterized using the standard method (atomic absorption spectrometry) while the adsorbent was prepared, carbonated and characterized using SEM and FTIR. The SEM findings revealed a highly porous morphology. The FTIR revealed the presence of various functional groups (OH, CH, C=C and C-C). The findings of the batch adsorption experiment were fitted using Langmuir and Freundlich isotherm models and Langmuir model gave a better fit. The kinetic data of iron (II) was evaluated using pseudo-first-order and pseudo-second-order kinetic models. The batch adsorption experimental data conforms more to the pseudo-first-order kinetic model.
{"title":"Adsorption of Iron (II) from Textile Industry Effluent uing Luffa Cylindrica","authors":"K. Nwosu‐Obieogu, G. Dzarma, B. Okolo, K. N. Akatobi","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.21663","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.21663","url":null,"abstract":"Abstract This research investigated the efficiency of luffa cylindrica activated carbon as adsorbent material in the removal of iron (II) from the textile industry effluent in a batch adsorption experiment. The adsorption process was studied as a function of contact time, pH of the solution and adsorbent dosage. At room temperature, the batch adsorption experiment showed maximum adsorption of iron (II) at a pH of 6, a contact time of 60 minutes and an adsorbent dosage of 1g/L. The effluent was characterized using the standard method (atomic absorption spectrometry) while the adsorbent was prepared, carbonated and characterized using SEM and FTIR. The SEM findings revealed a highly porous morphology. The FTIR revealed the presence of various functional groups (OH, CH, C=C and C-C). The findings of the batch adsorption experiment were fitted using Langmuir and Freundlich isotherm models and Langmuir model gave a better fit. The kinetic data of iron (II) was evaluated using pseudo-first-order and pseudo-second-order kinetic models. The batch adsorption experimental data conforms more to the pseudo-first-order kinetic model.","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":"42322965","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-V9I3.23058
M. A. Taleb
The preparation of Marine Fish Scales (MFS) and its analog doped with NaNO 3 (NaNO 3 /MFS) as new catalysts was discussed in this work. Then, these materials were characterized by ATG/ATD, X-ray diffraction, SEM, EDX, and IR spectrophotometer. The MFSand NaNO 3 /MFS can be used as eco-friendly catalysts for the Knoevenagel condensation and led to the functionalized alkenes in high yields with short reaction time. The tests show that 100 mg is the optimum mass, as well as the suitable solvent, is ethanol for the condensation of Knoevenagel. These parameters led to excellent yields (between 87 % and 99 % using NaNO 3 /MFS). These catalysts can be also reused for several times.
{"title":"Synthesis of functionalized alkenes via Knoevenagel condensation using Marine Fish Scales as a new efficient and eco-friendly catalyst","authors":"M. A. Taleb","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.23058","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.23058","url":null,"abstract":"The preparation of Marine Fish Scales (MFS) and its analog doped with NaNO 3 (NaNO 3 /MFS) as new catalysts was discussed in this work. Then, these materials were characterized by ATG/ATD, X-ray diffraction, SEM, EDX, and IR spectrophotometer. The MFSand NaNO 3 /MFS can be used as eco-friendly catalysts for the Knoevenagel condensation and led to the functionalized alkenes in high yields with short reaction time. The tests show that 100 mg is the optimum mass, as well as the suitable solvent, is ethanol for the condensation of Knoevenagel. These parameters led to excellent yields (between 87 % and 99 % using NaNO 3 /MFS). These catalysts can be also reused for several times.","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":"48228398","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-V9I3.22928
I. Ghazi, S. Jorio, M. Siniti, R. Fdil, H. Elattari
The objective of this study is to test the inhibitory efficiency of the methanol extract of P. harmala against the corrosion of carbon steel C38 in 1M hydrochloric acid by gravimetric method and electrochemical measurements. The results indicated that the methanol extract of P. harmala is a good inhibitor of carbon steel. The inhibition efficiency increases with the increase of the concentration of the inhibitor. The nature of adsorption of the extract on carbon steel surface was in conformity with Langmuir isotherm. Both kinetic and thermodynamic parameter of adsorption allows us to suggest chemical adsorption of this inhibitor on the metal. Potentiodynamic polarization measurements show that P. harmala acts as mixed type inhibitor. The result of EIS was correlating with the result of polarization measurement. A theoretical study was done in solution for major alkaloids isolated from P. harmala seeds, and was investigated using density functional theory (DFT) at the B3LYP/6-31G(d,p) basis set level through the relationship between their molecular and electronic structure. The quantum chemical parameters such as E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), energy gap (ΔE), dipole moment (μ), absolute hardness (η), absolute softness (S), the absolute electronegativity (χ), the fractions of electrons transferred from the inhibitor molecule to the metallic atom (ΔN) and the electrophilicity index (ω) were calculated. The local selectivity and reactivity has been analyzed through the Fukui function indices in order to compare the possible sites for nucleophilic and electrophilic attacks.
{"title":"Experimental and theoretical studies on corrosion inhibitory action of Peganum harmala (L.) seeds extract on carbon steel in 1M HCl","authors":"I. Ghazi, S. Jorio, M. Siniti, R. Fdil, H. Elattari","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.22928","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.22928","url":null,"abstract":"The objective of this study is to test the inhibitory efficiency of the methanol extract of P. harmala against the corrosion of carbon steel C38 in 1M hydrochloric acid by gravimetric method and electrochemical measurements. The results indicated that the methanol extract of P. harmala is a good inhibitor of carbon steel. The inhibition efficiency increases with the increase of the concentration of the inhibitor. The nature of adsorption of the extract on carbon steel surface was in conformity with Langmuir isotherm. Both kinetic and thermodynamic parameter of adsorption allows us to suggest chemical adsorption of this inhibitor on the metal. Potentiodynamic polarization measurements show that P. harmala acts as mixed type inhibitor. The result of EIS was correlating with the result of polarization measurement. A theoretical study was done in solution for major alkaloids isolated from P. harmala seeds, and was investigated using density functional theory (DFT) at the B3LYP/6-31G(d,p) basis set level through the relationship between their molecular and electronic structure. The quantum chemical parameters such as E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), energy gap (ΔE), dipole moment (μ), absolute hardness (η), absolute softness (S), the absolute electronegativity (χ), the fractions of electrons transferred from the inhibitor molecule to the metallic atom (ΔN) and the electrophilicity index (ω) were calculated. The local selectivity and reactivity has been analyzed through the Fukui function indices in order to compare the possible sites for nucleophilic and electrophilic attacks.","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":"45089825","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-V9I3.23191
S. Suherman, Yoga Nurwijaya, E. Wahyuni, D. Siswanta, K. Morita, Y. Oki
World Health Organization (WHO) mentioned that diarrhea is one of the main causes of under-five mortality in developing countries due to Escherichia coli ( E. coli ) bacteria. Synthesis of colistin-conjugated-carbon dots using ammonium citrate as a precursor for E. coli detection has been carried out to study its application for detection in water samples from urban population wells. Synthesis of carbon dots (CDs) was carrried out using conventional pyrolisis method. Ammonium citrate with mass variation of 10; 15; 20; and 25 mg were added to 2.5 g colistin and heated at 180 C for 1 h. Brown residue was yielded; more over the functional groups and morphology were characterized by FT-IR and TEM. The brown residue is further diluted by distilled water, centrifuged at 8000 rpm for 10 min. The absorbances were analyzed using spectrophotometer UV-Vis. Carbon dots colistin with different concentration of ammonium citrate variations were analyzed using spectrophotometer fluorescence at 310-450 nm and the highest intensity would be used for E. coli detection. From the experimental part, it was found that CDs colistin has spherical morphology with diameter around 3-10 nm. The highest intensity was achieved at excitation wavelength of 360 nm from CDs colistin with 20 mg ammonium citrate. In the detection process of three household urban wells water in Yogyakarta-Indonesia, it was concluded that one sample was found to contain E. coli whose concentration was higher than the permitted limit of 235 cfu per 100 mL set by Ministry of Health-Republic of Indonesia.
{"title":"Effect of ammonium citrate concentration variation on the carbon dots colistin modification for Escherichia coli detection","authors":"S. Suherman, Yoga Nurwijaya, E. Wahyuni, D. Siswanta, K. Morita, Y. Oki","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.23191","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.23191","url":null,"abstract":"World Health Organization (WHO) mentioned that diarrhea is one of the main causes of under-five mortality in developing countries due to Escherichia coli ( E. coli ) bacteria. Synthesis of colistin-conjugated-carbon dots using ammonium citrate as a precursor for E. coli detection has been carried out to study its application for detection in water samples from urban population wells. Synthesis of carbon dots (CDs) was carrried out using conventional pyrolisis method. Ammonium citrate with mass variation of 10; 15; 20; and 25 mg were added to 2.5 g colistin and heated at 180 C for 1 h. Brown residue was yielded; more over the functional groups and morphology were characterized by FT-IR and TEM. The brown residue is further diluted by distilled water, centrifuged at 8000 rpm for 10 min. The absorbances were analyzed using spectrophotometer UV-Vis. Carbon dots colistin with different concentration of ammonium citrate variations were analyzed using spectrophotometer fluorescence at 310-450 nm and the highest intensity would be used for E. coli detection. From the experimental part, it was found that CDs colistin has spherical morphology with diameter around 3-10 nm. The highest intensity was achieved at excitation wavelength of 360 nm from CDs colistin with 20 mg ammonium citrate. In the detection process of three household urban wells water in Yogyakarta-Indonesia, it was concluded that one sample was found to contain E. coli whose concentration was higher than the permitted limit of 235 cfu per 100 mL set by Ministry of Health-Republic of Indonesia.","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":"46712458","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-V9I3.22253
Z. Kadri
Epoxies have been used in the internal coating of cans to endure a long shelf life for canned goods; several types of interactions exist between this kind of packaging (container) and the packed product (contained). This container/contained contact can influence the properties of the packed product, we are interested in this study to contribute to the development of a new formulation in order to prepare an Epoxy coating able to come in contact with foodstuffs, thus our studies based on a selective choice of raw materials that respect the international regulation of food contact, while taking into account the stoichiometric parameters to have a well-cross-linked and resistant polymer. However, the aim of this work is to study the behavior of this developed epoxy coating in contact with different simulant, which represent three categories of food. Within this study, we have characterized the epoxy paint by infra-red, and we have follow the mass variation and the sorption’s kinetics of water, acid acetic, and ethanol in contact with epoxy film by the gravimetric technique, the results allowed us to calculate the diffusion coefficient of each simulant, and then compute the activation energy and thermodynamic parameters. Moreover, the results of the gravimetric method show that the temperature impact the kinetics of diffusion more than the contact time do, the mass transfer depends on the nature of the simulant in contact and on its physic-chemical properties, it concluded also the mass stability of the epoxy coating from 25°C to 40°C.
{"title":"STUDY OF THE BEHAVIOR OF AN EPOXY COATING FOOD CONTACT","authors":"Z. Kadri","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.22253","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.22253","url":null,"abstract":"Epoxies have been used in the internal coating of cans to endure a long shelf life for canned goods; several types of interactions exist between this kind of packaging (container) and the packed product (contained). This container/contained contact can influence the properties of the packed product, we are interested in this study to contribute to the development of a new formulation in order to prepare an Epoxy coating able to come in contact with foodstuffs, thus our studies based on a selective choice of raw materials that respect the international regulation of food contact, while taking into account the stoichiometric parameters to have a well-cross-linked and resistant polymer. However, the aim of this work is to study the behavior of this developed epoxy coating in contact with different simulant, which represent three categories of food. Within this study, we have characterized the epoxy paint by infra-red, and we have follow the mass variation and the sorption’s kinetics of water, acid acetic, and ethanol in contact with epoxy film by the gravimetric technique, the results allowed us to calculate the diffusion coefficient of each simulant, and then compute the activation energy and thermodynamic parameters. Moreover, the results of the gravimetric method show that the temperature impact the kinetics of diffusion more than the contact time do, the mass transfer depends on the nature of the simulant in contact and on its physic-chemical properties, it concluded also the mass stability of the epoxy coating from 25°C to 40°C.","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":"48174256","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-V9I3.21872
Kaoutar El Oumlouki
Ceratonia siliqua L. ou la caroube est une espece agro-forestiere-pastorale avec d'enormes interets socio-economiques et ecologiques. Il a longtemps ete cultive pour l'alimentation humaine et animale. Actuellement, il est de plus en plus utilise par les secteurs alimentaires, pharmaceutiques et dietetiques. C'est une espece typiquement mediterraneenne et elargie distribuee au Maroc. Afin de caracteriser et valoriser la caroube du Maroc, une etude comparative de la composition minerale de la pulpe de caroube de quatre regions du Maroc (Beni-Mellal, Chaoun, Tafraoute et Taounate) pour l’elite de la region pour la region chaque element mineral, les resultats de ces travaux comportent une difference significative pour tous les parametres chimiques et physico-chimiques entre les regions etudiees. La caracterisation a montre une gamme de variation en termes de teneur en eau, + = 1121,1-1300,2 mg / 100g, P = 41,9-57., 2 mg / 100g, Ca 2+ = 270,4- 305,3 mg / 100g, Mg 2+ = 40,4- 144, 8 mg / 100g et Na + = 31,6-81,7 mg / 100g Fe 2+ = 5,26-6,66 mg / 100g, Zn 2+ = 1,80-2,61 mg / 100g, Mn 2+ = 0., 60-0,75 mg / 100g, Cu 2+ = 0,42-0,56 mg / 100g).
{"title":"Comparative study of the mineral composition of carob pulp (Ceratonia siliqua L.) from various regions in Morocco","authors":"Kaoutar El Oumlouki","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.21872","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.21872","url":null,"abstract":"Ceratonia siliqua L. ou la caroube est une espece agro-forestiere-pastorale avec d'enormes interets socio-economiques et ecologiques. Il a longtemps ete cultive pour l'alimentation humaine et animale. Actuellement, il est de plus en plus utilise par les secteurs alimentaires, pharmaceutiques et dietetiques. C'est une espece typiquement mediterraneenne et elargie distribuee au Maroc. Afin de caracteriser et valoriser la caroube du Maroc, une etude comparative de la composition minerale de la pulpe de caroube de quatre regions du Maroc (Beni-Mellal, Chaoun, Tafraoute et Taounate) pour l’elite de la region pour la region chaque element mineral, les resultats de ces travaux comportent une difference significative pour tous les parametres chimiques et physico-chimiques entre les regions etudiees. La caracterisation a montre une gamme de variation en termes de teneur en eau, + = 1121,1-1300,2 mg / 100g, P = 41,9-57., 2 mg / 100g, Ca 2+ = 270,4- 305,3 mg / 100g, Mg 2+ = 40,4- 144, 8 mg / 100g et Na + = 31,6-81,7 mg / 100g Fe 2+ = 5,26-6,66 mg / 100g, Zn 2+ = 1,80-2,61 mg / 100g, Mn 2+ = 0., 60-0,75 mg / 100g, Cu 2+ = 0,42-0,56 mg / 100g).","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":"48740220","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-V9I3.23303
Hanane Ait Hmeid
The dyes are used in many industrial sectors such as textiles, paper and leather dyeing, as well as in the food and cosmetics industry. Dyes are known to be toxic and persistent in the environment and require physico-chemical techniques to degrade them. This work deals with the study of the adsorption of the cationic dye methylene blue on raw bentonite from the region of Nador (Morocco). The physico-chemical properties show that our bentonite indicates a very high alkalinity. The amplitude of swelling shows that this bentonite is very high is sensitive to water. The SEM shows petaloid-shaped aggregates of the grains in spherical form with heterogeneous dimensions. Various experimental parameters were analyzed; initial concentration of the dye, pH, mass of the adsorbent and temperature. Adsorption tests showed that the maximum duration of this cationic dye on bentonite is established after 80 minutes. Experimental results showed that the adsorption of the methylene blue dye on raw bentonite depends on the pH of the solution and the initial concentration of the dye. Although the amount of methylene blue adsorbed decreases with increasing temperature, this indicates that adsorption is an exothermic process. The adsorption capacity was determined using the Langmuir, Freundlich, Elovich and Temkin isotherms. The binding of methylene blue follows Freundlich's law.
{"title":"Adsorption of a basic dye, Methylene Blue, in aqueous solution on bentonite","authors":"Hanane Ait Hmeid","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.23303","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.23303","url":null,"abstract":"The dyes are used in many industrial sectors such as textiles, paper and leather dyeing, as well as in the food and cosmetics industry. Dyes are known to be toxic and persistent in the environment and require physico-chemical techniques to degrade them. This work deals with the study of the adsorption of the cationic dye methylene blue on raw bentonite from the region of Nador (Morocco). The physico-chemical properties show that our bentonite indicates a very high alkalinity. The amplitude of swelling shows that this bentonite is very high is sensitive to water. The SEM shows petaloid-shaped aggregates of the grains in spherical form with heterogeneous dimensions. Various experimental parameters were analyzed; initial concentration of the dye, pH, mass of the adsorbent and temperature. Adsorption tests showed that the maximum duration of this cationic dye on bentonite is established after 80 minutes. Experimental results showed that the adsorption of the methylene blue dye on raw bentonite depends on the pH of the solution and the initial concentration of the dye. Although the amount of methylene blue adsorbed decreases with increasing temperature, this indicates that adsorption is an exothermic process. The adsorption capacity was determined using the Langmuir, Freundlich, Elovich and Temkin isotherms. The binding of methylene blue follows Freundlich's law.","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":"48321745","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-V9I3.23461
E. Olawale
The Structural, electronic, elastic and optical properties of the fluoroperovskite LiBAF 3 are obtained using the plane-wave pseudopotential implementation of the PWscf code method in the framework of density functional theory (DFT), with the local density approximation (LDA) and the generalized gradient approximation (GGA). The result shows LiBAF3 compound has a direct band gap with 6.7eV and 6.5ev using PBE-GGA and PBEsol-GGA respectively. It satisfies the Born’s stability condition and thus implies the compound is stable. Refractive index, coefficient of extinction and dielectric function have all been computed.
{"title":"Investigation of the Fluoroperovskite LiBaF3, Examining the Optical, Elastic, Electronic and Structural Properties: DFT Study.","authors":"E. Olawale","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.23461","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.23461","url":null,"abstract":"The Structural, electronic, elastic and optical properties of the fluoroperovskite LiBAF 3 are obtained using the plane-wave pseudopotential implementation of the PWscf code method in the framework of density functional theory (DFT), with the local density approximation (LDA) and the generalized gradient approximation (GGA). The result shows LiBAF3 compound has a direct band gap with 6.7eV and 6.5ev using PBE-GGA and PBEsol-GGA respectively. It satisfies the Born’s stability condition and thus implies the compound is stable. Refractive index, coefficient of extinction and dielectric function have all been computed.","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":"42355813","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-V9I3.22091
S. Gaamouche
The study aimed to determine the antimicrobial activity of bacteriocinogenic lactic acid bacteria isolated from olive brine and three essential oils (Thyme, Rosemary and Oregano Eos) alone and in combination against the Gram-positive L. monocytogenes and the Gram-negative E. coli O157: H7. The antimicrobial activity was determined by evaluation of minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of the tested antimicrobial agents. The evaluation demonstrates that the two CFSs of lactic strains and the purified bacteriocins inhibit the growth of both L. monocytogenes and E. coli . The results showed that thyme EO is most effective followed by rosemary and Oregano Eos. Thus, all combination executed against L. monocytogenes using the checkerboard technique showed an additive effect unless the CFSs of LAB in combination with Thyme EO which showed no interactive effect. Whereas the combination against E. coli, only two bacteriocins in combination with Thyme EO and ELBC02 bacteriocin in combination with Rosemary EO that showed an additive effect. The results obtained in these studies coupled with the right knowledge opens the way to the combination as a new field of application whose goal is confined to conservation and the safety of food.
{"title":"Combined antimicrobial effect of bacteriocins of LAB isolated from a traditional brine table olives and essential oils against foodborne pathogens","authors":"S. Gaamouche","doi":"10.48317/IMIST.PRSM/MORJCHEM-V9I3.22091","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V9I3.22091","url":null,"abstract":"The study aimed to determine the antimicrobial activity of bacteriocinogenic lactic acid bacteria isolated from olive brine and three essential oils (Thyme, Rosemary and Oregano Eos) alone and in combination against the Gram-positive L. monocytogenes and the Gram-negative E. coli O157: H7. The antimicrobial activity was determined by evaluation of minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) of the tested antimicrobial agents. The evaluation demonstrates that the two CFSs of lactic strains and the purified bacteriocins inhibit the growth of both L. monocytogenes and E. coli . The results showed that thyme EO is most effective followed by rosemary and Oregano Eos. Thus, all combination executed against L. monocytogenes using the checkerboard technique showed an additive effect unless the CFSs of LAB in combination with Thyme EO which showed no interactive effect. Whereas the combination against E. coli, only two bacteriocins in combination with Thyme EO and ELBC02 bacteriocin in combination with Rosemary EO that showed an additive effect. The results obtained in these studies coupled with the right knowledge opens the way to the combination as a new field of application whose goal is confined to conservation and the safety of food.","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":"42321985","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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