Pub Date : 2020-08-22DOI: 10.13171/mjc10802008221476ah
Abdelghani Hajji, Yassir Lairgi, A. Lachhab, A. Abbou
There are several techniques proposed to fight against the COVID-19 pandemic, such as contact limitation, hygiene, high-frequency tests, use of mask, home delivery, and quarantine. Morocco is one of the rare countries which decided an early lockdown against the new Coronavirus. During this period, we offer techniques that allow efficient processing of household waste to avoid or minimize to take out the trash. We are presenting different techniques that make it possible to treat waste. Then, we have modeled the spread of this pandemic in Morocco using the SIR model. Finally, we have shown the effects of waste management on the proliferation of Coronavirus. The results show that it is better to sort the waste, install a composter or a domestic digester in buildings and hospitals (more precisely in the room of the contaminated person) to produce the compost or methane (renewable energy), which may finally contribute in limiting the spread of the COVID-19 pandemic.
{"title":"Impact of Waste Recovery on the COVID-19 Propagation","authors":"Abdelghani Hajji, Yassir Lairgi, A. Lachhab, A. Abbou","doi":"10.13171/mjc10802008221476ah","DOIUrl":"https://doi.org/10.13171/mjc10802008221476ah","url":null,"abstract":"There are several techniques proposed to fight against the COVID-19 pandemic, such as contact limitation, hygiene, high-frequency tests, use of mask, home delivery, and quarantine. Morocco is one of the rare countries which decided an early lockdown against the new Coronavirus. During this period, we offer techniques that allow efficient processing of household waste to avoid or minimize to take out the trash. We are presenting different techniques that make it possible to treat waste. Then, we have modeled the spread of this pandemic in Morocco using the SIR model. Finally, we have shown the effects of waste management on the proliferation of Coronavirus. The results show that it is better to sort the waste, install a composter or a domestic digester in buildings and hospitals (more precisely in the room of the contaminated person) to produce the compost or methane (renewable energy), which may finally contribute in limiting the spread of the COVID-19 pandemic.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"21 1","pages":"744-751"},"PeriodicalIF":0.0,"publicationDate":"2020-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84018653","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 : 2020-08-21DOI: 10.13171/mjc10802108201448hb
H. Bellefqih, R. Fakhreddine, R. Tigha, A. Aatiq
Three new A II (Sb 0.5 Cr 0.5 )(PO 4 ) 2 (A II = Ba, Sr, Pb) yavapaiite phases, abbreviated as [ASbCr], have been successfully synthesized by a conventional solid-state reaction in air atmosphere. Their crystal structures have been investigated by Rietveld analysis from the X-ray powder diffraction method. Results show that Ba(Sb 0.5 Cr 0.5 )(PO 4 ) 2 crystallizes in monoclinic C 2 /m space group (Z = 2) with cell parameters a = 8.140(1) A; b = 5.175(1) A; c = 7.802(1) A and β = 94.387(1)°. Structures of A II (Sb 0.5 Cr 0.5 )(PO 4 ) 2 (A II = Sr, Pb) compounds are comparable, and both crystallize in a distorted yavapaiite structure with C 2 /c space group (Z = 4). Obtained monoclinic cell parameters are: a = 16.5038(2) A; b = 5.1632(1) A; c = 8.0410(1) A; β = 115.85(1) for [SrSbCr] and a = 16.684(2) A; b = 5.156(1) A c = 8.115(1) A; β = 115.35(1)° for [PbSbCr]. Infrared and Raman spectroscopic study was undertaken to provide information about vibrations bonds within the studied yavapaiite materials.
{"title":"Structure, Infrared and Raman spectroscopic studies of new AII(SbV0.50CrIII0.50)(PO4)2 (A = Ba, Sr, Pb) yavapaiite phases","authors":"H. Bellefqih, R. Fakhreddine, R. Tigha, A. Aatiq","doi":"10.13171/mjc10802108201448hb","DOIUrl":"https://doi.org/10.13171/mjc10802108201448hb","url":null,"abstract":"Three new A II (Sb 0.5 Cr 0.5 )(PO 4 ) 2 (A II = Ba, Sr, Pb) yavapaiite phases, abbreviated as [ASbCr], have been successfully synthesized by a conventional solid-state reaction in air atmosphere. Their crystal structures have been investigated by Rietveld analysis from the X-ray powder diffraction method. Results show that Ba(Sb 0.5 Cr 0.5 )(PO 4 ) 2 crystallizes in monoclinic C 2 /m space group (Z = 2) with cell parameters a = 8.140(1) A; b = 5.175(1) A; c = 7.802(1) A and β = 94.387(1)°. Structures of A II (Sb 0.5 Cr 0.5 )(PO 4 ) 2 (A II = Sr, Pb) compounds are comparable, and both crystallize in a distorted yavapaiite structure with C 2 /c space group (Z = 4). Obtained monoclinic cell parameters are: a = 16.5038(2) A; b = 5.1632(1) A; c = 8.0410(1) A; β = 115.85(1) for [SrSbCr] and a = 16.684(2) A; b = 5.156(1) A c = 8.115(1) A; β = 115.35(1)° for [PbSbCr]. Infrared and Raman spectroscopic study was undertaken to provide information about vibrations bonds within the studied yavapaiite materials.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"35 1","pages":"734-743"},"PeriodicalIF":0.0,"publicationDate":"2020-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83453994","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 : 2020-08-07DOI: 10.13171/mjc10702008071447nb
D. Lakhal, Bouchaib Bahlaouan, N. Boutaleb, M. Bennani, S. Antri
Since the advent of agriculture, organic wastes have been used to fertilize agricultural soils. The sustainability of the recovery of these wastes depends on the quality of the products developed in order to meet the expectations of the agricultural profession. The objective of our study was to evaluate the quality of the biotransformation of a ternary mixture of industrial waste: fish waste, molasses, and grape marc. Several balanced mixtures were developed and underwent natural biotransformation for two weeks to produce a fertilizer of good nutritional and microbiological quality. Quality control parameters (pH, conductivity, dry matter, phosphorus, nitrogen, potassium, carbon, etc.) were monitored during the time stipulated for biotransformation. The results showed that the bio-fertilizer generated from the mentioned wastes is characterized by good agronomic quality (rich in phosphorus, nitrogen, and potassium), mature, with a stable pH and had an excellent hygienic condition, due to the absence of spoilage microorganisms, which would constitute a major obstacle to the adoption of this practice. The fertilization test showed that our product is more interesting than commercial fertilizer. Triangular surfaces of iso-responses are established to identify the relevant formulations leading to a product of specific interest to build in practice a predictive operational model for industrial waste management. The biotransformation of a mixture consisting of approximately 50% of fish waste, 12.5% molasses, and 37.50% grape marc is an optimal formulation to generate a product rich in the nutrients essential for optimal growth plants (nitrogen, phosphorus, and potassium). The formulas do not integrate the grape marc was the most unfavorable mixtures from their efficacy and/or health safety criteria.
{"title":"Agricultural valorization by biotransformation of fish wastes combined with grape marc and molasses","authors":"D. Lakhal, Bouchaib Bahlaouan, N. Boutaleb, M. Bennani, S. Antri","doi":"10.13171/mjc10702008071447nb","DOIUrl":"https://doi.org/10.13171/mjc10702008071447nb","url":null,"abstract":"Since the advent of agriculture, organic wastes have been used to fertilize agricultural soils. The sustainability of the recovery of these wastes depends on the quality of the products developed in order to meet the expectations of the agricultural profession. The objective of our study was to evaluate the quality of the biotransformation of a ternary mixture of industrial waste: fish waste, molasses, and grape marc. Several balanced mixtures were developed and underwent natural biotransformation for two weeks to produce a fertilizer of good nutritional and microbiological quality. Quality control parameters (pH, conductivity, dry matter, phosphorus, nitrogen, potassium, carbon, etc.) were monitored during the time stipulated for biotransformation. The results showed that the bio-fertilizer generated from the mentioned wastes is characterized by good agronomic quality (rich in phosphorus, nitrogen, and potassium), mature, with a stable pH and had an excellent hygienic condition, due to the absence of spoilage microorganisms, which would constitute a major obstacle to the adoption of this practice. The fertilization test showed that our product is more interesting than commercial fertilizer. Triangular surfaces of iso-responses are established to identify the relevant formulations leading to a product of specific interest to build in practice a predictive operational model for industrial waste management. The biotransformation of a mixture consisting of approximately 50% of fish waste, 12.5% molasses, and 37.50% grape marc is an optimal formulation to generate a product rich in the nutrients essential for optimal growth plants (nitrogen, phosphorus, and potassium). The formulas do not integrate the grape marc was the most unfavorable mixtures from their efficacy and/or health safety criteria.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"15 1","pages":"723-733"},"PeriodicalIF":0.0,"publicationDate":"2020-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87114225","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 : 2020-08-06DOI: 10.13171/mjc10702008061491am
A. Moukhles, A. Mansour
The present research aimed to study the effect of drying time on the yield and chemical composition of essential oil (EO) and dissolved oil in hydrolat (HY) from aerial parts of Moroccan Thymbra capitata (L.) Cav. Drying of plant material was carried out naturally in the shade of a draughty place at room temperature (25–27°C). A series of 10 plant samples were subjected to hydrodistillation using a Clevenger-type apparatus. The results indicated that the yield of EO increased with drying time to reach the highest value on the 8 th drying day (2.7%), while the yield of HY has not undergone an apparent variation (0.2% – 0.6%). Based on the GC-MS analyses, EO was composed mainly of the phenolic monoterpene carvacrol (80.10%–92.27%) along with its biogenetic precursors' monoterpene hydrocarbons in a 1.02%–4.81% range p -cymene and 0.24% -1.86 % γ -terpinene. Other essential components occurring in minor quantity were sesquiterpene hydrocarbon a -humulene (2.58% – 4.67%) and oxygenated monoterpene linalool (0.80% –2.06%). At the same time, HY was constituted mainly of carvacrol (94.67–98.42%) along with a -humulene at much lower concentrations (0.31%–0.86%) and the oxygenated derivative acetovanillone acetate (0.2%–1.80%). On the other hand, the highest concentration of carvacrol in EO was reached on the 5 th day of the drying plant process (92.27%), while the HY recovered on the 7 th day has shown carvacrol in its highest concentration (98.42%).
{"title":"The effect of drying time on the yield and the chemical composition of essential oil and dissolved oil in hydrolat from aerial parts of Moroccan Thymbra capitata (L.) Cav","authors":"A. Moukhles, A. Mansour","doi":"10.13171/mjc10702008061491am","DOIUrl":"https://doi.org/10.13171/mjc10702008061491am","url":null,"abstract":"The present research aimed to study the effect of drying time on the yield and chemical composition of essential oil (EO) and dissolved oil in hydrolat (HY) from aerial parts of Moroccan Thymbra capitata (L.) Cav. Drying of plant material was carried out naturally in the shade of a draughty place at room temperature (25–27°C). A series of 10 plant samples were subjected to hydrodistillation using a Clevenger-type apparatus. The results indicated that the yield of EO increased with drying time to reach the highest value on the 8 th drying day (2.7%), while the yield of HY has not undergone an apparent variation (0.2% – 0.6%). Based on the GC-MS analyses, EO was composed mainly of the phenolic monoterpene carvacrol (80.10%–92.27%) along with its biogenetic precursors' monoterpene hydrocarbons in a 1.02%–4.81% range p -cymene and 0.24% -1.86 % γ -terpinene. Other essential components occurring in minor quantity were sesquiterpene hydrocarbon a -humulene (2.58% – 4.67%) and oxygenated monoterpene linalool (0.80% –2.06%). At the same time, HY was constituted mainly of carvacrol (94.67–98.42%) along with a -humulene at much lower concentrations (0.31%–0.86%) and the oxygenated derivative acetovanillone acetate (0.2%–1.80%). On the other hand, the highest concentration of carvacrol in EO was reached on the 5 th day of the drying plant process (92.27%), while the HY recovered on the 7 th day has shown carvacrol in its highest concentration (98.42%).","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"14 1","pages":"716-722"},"PeriodicalIF":0.0,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90460884","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 : 2020-08-04DOI: 10.13171/mjc107020081505la
Loubna Azariz, M. Fekhaoui, S. Elblidi, A. Yahyaoui
the increasing number of cases of soil contamination by trace elements have affected crop production, and represents a risk threatening the quality of our food products. Some of these contaminants, such as trivalent chromium Cr (NO 3 ) 3, which is similar to micronutrients, can, therefore, be absorbed by plants and whose phytotoxicity has long been considered negligible, and largely underestimated. The purpose of this work was to study the transfer of trivalent chromium from nutrient solution to green beans Phaseolus vulgaris L grown on bioponics; the contamination responses were determined in terms of growth parameters, yield, and dry matter production; at various concentrations (5, 10 and 20 ppm). Chromium trivalent effects have also been studied in tissues plant. Results showed that the absorption of trivalent chromium from the nutrient solution and its translocation to the aerial tissues plants had no adverse effects on growth parameters, and also on beans yield. Results also showed that chromium accumulates in roots rather than in the other tissues, and did not reduce the dry matter production, in terms of translocation and bioconcentration. The transfer factor is low and green beans cannot be defined as a hyperaccumulator of chromium.
{"title":"Translocation and bioconcentration of trivalent chromium in green beans grown on bioponics","authors":"Loubna Azariz, M. Fekhaoui, S. Elblidi, A. Yahyaoui","doi":"10.13171/mjc107020081505la","DOIUrl":"https://doi.org/10.13171/mjc107020081505la","url":null,"abstract":"the increasing number of cases of soil contamination by trace elements have affected crop production, and represents a risk threatening the quality of our food products. Some of these contaminants, such as trivalent chromium Cr (NO 3 ) 3, which is similar to micronutrients, can, therefore, be absorbed by plants and whose phytotoxicity has long been considered negligible, and largely underestimated. The purpose of this work was to study the transfer of trivalent chromium from nutrient solution to green beans Phaseolus vulgaris L grown on bioponics; the contamination responses were determined in terms of growth parameters, yield, and dry matter production; at various concentrations (5, 10 and 20 ppm). Chromium trivalent effects have also been studied in tissues plant. Results showed that the absorption of trivalent chromium from the nutrient solution and its translocation to the aerial tissues plants had no adverse effects on growth parameters, and also on beans yield. Results also showed that chromium accumulates in roots rather than in the other tissues, and did not reduce the dry matter production, in terms of translocation and bioconcentration. The transfer factor is low and green beans cannot be defined as a hyperaccumulator of chromium.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"34 1","pages":"708-715"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78520126","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 : 2020-08-03DOI: 10.13171/mjc107020081481bj
Montri Thapplee, Chadaporn Krutpijit, P. Praserthdam, B. Jongsomjit
The catalytic ethanol dehydration to diethyl ether (DEE) over the synthesized beta zeolite (BEA) with different acidity on catalysts having Na and mixed Na-H forms was studied. The Na form of BEA catalyst was synthesized via the hydrothermal process, including non-calcined (Na-BEA_N) and calcined (Na-BEA_C) catalysts. The Na-BEA_C catalyst was successively used in the synthesis of different mixed Na-H forms under the ion-exchange method using the ammonium nitrate solution at 70°C for 2 h/cycle. In the present study, two different cycles were chosen, including one cycle (M-BEA_1) and four cycles (M-BEA_4) to compare the amount of acidity on catalysts. The results indicated that the M-BEA_1 catalyst exhibited a large surface area and contained the highest moderate acid site, which strongly affected the optimal catalytic activity at low temperature (<250°C) with ethanol conversion of 74.6% and DEE yield of 27.3%. However, the increased number of ion-exchange cycles had not shown remarkable effects on catalytic activity due to low surface area and moderate acidity.
{"title":"Modification of acid on beta zeolite catalysts by ion-exchange method for ethanol dehydration to diethyl ether","authors":"Montri Thapplee, Chadaporn Krutpijit, P. Praserthdam, B. Jongsomjit","doi":"10.13171/mjc107020081481bj","DOIUrl":"https://doi.org/10.13171/mjc107020081481bj","url":null,"abstract":"The catalytic ethanol dehydration to diethyl ether (DEE) over the synthesized beta zeolite (BEA) with different acidity on catalysts having Na and mixed Na-H forms was studied. The Na form of BEA catalyst was synthesized via the hydrothermal process, including non-calcined (Na-BEA_N) and calcined (Na-BEA_C) catalysts. The Na-BEA_C catalyst was successively used in the synthesis of different mixed Na-H forms under the ion-exchange method using the ammonium nitrate solution at 70°C for 2 h/cycle. In the present study, two different cycles were chosen, including one cycle (M-BEA_1) and four cycles (M-BEA_4) to compare the amount of acidity on catalysts. The results indicated that the M-BEA_1 catalyst exhibited a large surface area and contained the highest moderate acid site, which strongly affected the optimal catalytic activity at low temperature (<250°C) with ethanol conversion of 74.6% and DEE yield of 27.3%. However, the increased number of ion-exchange cycles had not shown remarkable effects on catalytic activity due to low surface area and moderate acidity.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"1 1","pages":"697-707"},"PeriodicalIF":0.0,"publicationDate":"2020-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90315567","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 : 2020-07-28DOI: 10.13171/mjc10702007281485hd
Badia Douhri, I. Raissouni, N. Amajoud, A. Farah, Nadia Skali Senhaji, J. Abrini, Hikmat Douhri
This study describes the chemical composition and biological activities of essential oils of the Moroccan plants Thymbra capitata (L.) Cav. and Origanum elongatum (Bonnet) Emb. & Maire on biofilms of Staphylococcus aureus strains. The qualitative and quantitative composition of the two essential oils was analyzed by gas chromatography and gas chromatography-mass spectrometry. The Minimum Inhibitory Concentration was determined by the broth microdilution method. The results showed that essential oils of Thymbra capitata and Origanum elongatum inhibit biofilm formation in biofilm inhibitory concentrations (0.5 and 2% v/v) and eradicate biofilm at biofilm eradication concentrations (1 and> 4% v/v), specific to each essential oil. Values were twofold or fourfold higher than the concentration required to inhibit or eradicate planktonic bacteria growth. The use of essential oils of Thymbra capitata and Origanum elongatum as natural antimicrobial agents may effectively inhibit the growth of biofilms of medical relevance. Results indicated that essential oils of Thymbra capitata and Origanum elongatum might be a potential alternative against Staphylococcus resistant strains.
{"title":"Chemical composition and biological evaluation of essential oils from some Moroccan plants","authors":"Badia Douhri, I. Raissouni, N. Amajoud, A. Farah, Nadia Skali Senhaji, J. Abrini, Hikmat Douhri","doi":"10.13171/mjc10702007281485hd","DOIUrl":"https://doi.org/10.13171/mjc10702007281485hd","url":null,"abstract":"This study describes the chemical composition and biological activities of essential oils of the Moroccan plants Thymbra capitata (L.) Cav. and Origanum elongatum (Bonnet) Emb. & Maire on biofilms of Staphylococcus aureus strains. The qualitative and quantitative composition of the two essential oils was analyzed by gas chromatography and gas chromatography-mass spectrometry. The Minimum Inhibitory Concentration was determined by the broth microdilution method. The results showed that essential oils of Thymbra capitata and Origanum elongatum inhibit biofilm formation in biofilm inhibitory concentrations (0.5 and 2% v/v) and eradicate biofilm at biofilm eradication concentrations (1 and> 4% v/v), specific to each essential oil. Values were twofold or fourfold higher than the concentration required to inhibit or eradicate planktonic bacteria growth. The use of essential oils of Thymbra capitata and Origanum elongatum as natural antimicrobial agents may effectively inhibit the growth of biofilms of medical relevance. Results indicated that essential oils of Thymbra capitata and Origanum elongatum might be a potential alternative against Staphylococcus resistant strains.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"1 1","pages":"687-696"},"PeriodicalIF":0.0,"publicationDate":"2020-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89855570","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 : 2020-07-27DOI: 10.13171/mjc10702007271480klv
Huu Son Ta, K. Van, Thu Thuy Luong Thi, Thanh Hoa Ha
The kinetics of phenol adsorption from aqueous solution on activated carbons (ACs) obtained from coffee husk by potassium Hydroxide (KOH) activation at 650 and 750 o C have been studied in the range of 100-250 mg L -1 initial phenol concentrations and at the temperatures range of 10 – 40 o C. Kinetic models for phenol adsorption were evaluated using pseudo-first-order, pseudo-second-order, and Elovich models. The adsorption mechanism was investigated using Reichenberg, Boyd, and Weber and Morris models. The adsorption on coffee husk activated carbon was found to be a fast or speedy process with the adsorption rate, k 2 q e , in the range of 0.130 to 0.977 min -1 . The adsorption process was mainly physical and promoted by chemical sorption and controlled not only by intra-particle diffusion but also by pore diffusion throughout the entire adsorption period.
在100 ~ 250 mg L -1苯酚初始浓度范围和10 ~ 40℃温度范围内，研究了咖啡壳氢氧化钾(KOH)活化活性炭(ACs)在650℃和750℃条件下对苯酚的吸附动力学。采用拟一级、拟二级和Elovich模型评价了苯酚吸附动力学模型。采用Reichenberg、Boyd、Weber和Morris模型研究了吸附机理。结果表明，咖啡壳活性炭的吸附速度为0.130 ~ 0.977 min -1，吸附速率为k2q - e。吸附过程主要是物理吸附和化学吸附，整个吸附过程不仅受颗粒内扩散控制，还受孔隙扩散控制。
{"title":"Kinetic studies on the adsorption of phenol from aqueous solution by coffee husk activated carbon","authors":"Huu Son Ta, K. Van, Thu Thuy Luong Thi, Thanh Hoa Ha","doi":"10.13171/mjc10702007271480klv","DOIUrl":"https://doi.org/10.13171/mjc10702007271480klv","url":null,"abstract":"The kinetics of phenol adsorption from aqueous solution on activated carbons (ACs) obtained from coffee husk by potassium Hydroxide (KOH) activation at 650 and 750 o C have been studied in the range of 100-250 mg L -1 initial phenol concentrations and at the temperatures range of 10 – 40 o C. Kinetic models for phenol adsorption were evaluated using pseudo-first-order, pseudo-second-order, and Elovich models. The adsorption mechanism was investigated using Reichenberg, Boyd, and Weber and Morris models. The adsorption on coffee husk activated carbon was found to be a fast or speedy process with the adsorption rate, k 2 q e , in the range of 0.130 to 0.977 min -1 . The adsorption process was mainly physical and promoted by chemical sorption and controlled not only by intra-particle diffusion but also by pore diffusion throughout the entire adsorption period.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"62 1","pages":"676-686"},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79898559","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}
Extracts of the leaves, stem, roots and seeds of Mitracarpus scaber plant have been fully investigated in an attempt to determine their phytochemical and antioxidant activities. Phytochemical screening carried out by thin layer chromatography (TLC) revealed the presence of several secondary metabolites in all the selective extracts of the plant. The levels of phenolic compounds showed that the leaves of M. Scaber are the richest in polyphenols with an average value of 488.291 μg EAG/g. The total flavonoid assay revealed a high content in the leaves (1.6236 %). In addition, studies of the antioxidant activities by DPPH ● method showed a significant effect compared to vitamin C (96.617 %). The percentages of inhibition are respectively 89.82 % and 82.3 % for ethyl acetate extracts of the leaves and seeds. Furthermore, the inhibitory percentages of n-butanol in the leaves and seeds are 90.57 % and 83.67 % respectively. Calculated IC 50 showed that the n-butanol fraction of the seeds exhibited the highest activity with an IC 50 of 0.293 mg/mL , less than ascorbic acid with an IC 50 of 0.387 mg/mL.
{"title":"Comparative Studies of the Phytochemical and Antioxidant activities of the leaves, stems, roots, and seeds extracts of Mitracarpus scaber Zucc (Rubiaceae)","authors":"Béa Gouanda Thibaut, W. Coulibaly, Benie Anoubilé, Kablan Ahmont Landry Claude, J. Titah, N’Guessan Hugues Alain, Kabran Aka Faustin, Konan Dibi Jacques, Attioua Koffi Barthélémy","doi":"10.13171/mjc10702007241441cwk","DOIUrl":"https://doi.org/10.13171/mjc10702007241441cwk","url":null,"abstract":"Extracts of the leaves, stem, roots and seeds of Mitracarpus scaber plant have been fully investigated in an attempt to determine their phytochemical and antioxidant activities. Phytochemical screening carried out by thin layer chromatography (TLC) revealed the presence of several secondary metabolites in all the selective extracts of the plant. The levels of phenolic compounds showed that the leaves of M. Scaber are the richest in polyphenols with an average value of 488.291 μg EAG/g. The total flavonoid assay revealed a high content in the leaves (1.6236 %). In addition, studies of the antioxidant activities by DPPH ● method showed a significant effect compared to vitamin C (96.617 %). The percentages of inhibition are respectively 89.82 % and 82.3 % for ethyl acetate extracts of the leaves and seeds. Furthermore, the inhibitory percentages of n-butanol in the leaves and seeds are 90.57 % and 83.67 % respectively. Calculated IC 50 showed that the n-butanol fraction of the seeds exhibited the highest activity with an IC 50 of 0.293 mg/mL , less than ascorbic acid with an IC 50 of 0.387 mg/mL.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"77 1","pages":"668-675"},"PeriodicalIF":0.0,"publicationDate":"2020-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82626523","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 : 2020-07-23DOI: 10.13171/mjc107020071461wk
W. Kumala
The binary systems of ZnO-Fe 2 O 3 nanocomposites were synthesized by a precipitation method with aqueous solutions of Fe and Zn nitrate, whereas nitrogen-doped ZnO-Fe 2 O 3 , silver-doped ZnO-Fe 2 O 3, and silver-nitrogen co-doped ZnO-Fe 2 O 3 nanocomposite were prepared by solid-state reaction. The structure and bandgap of the composites were studied using X-ray diffraction (XRD) and UV-visible diffuse reflectance spectroscopy (UV–vis). An aqueous model pollutant Methylene blue (MB) dye solution was used to evaluate photocatalytic degradation activities of the nanocomposites under visible light irradiation. Doping photocatalyst significantly increased the effectiveness of the photocatalyst in reducing bandgap energy. So 2.05 eV is the lowest energy, which is for Ag/N co-doped ZnO-Fe 2 O 3 photocatalysts. Results of the experiment that involved the photocatalysts revealed that Methylene blue degradations of 45.11%, 47%, 51%, and 64.5% in 180 min under light radiation using ZnO-Fe 2 O 3 , Ag-doped ZnO-Fe 2 O 3 , N-doped ZnO-Fe 2 O 3, and Ag/N co-doped ZnO-Fe 2 O 3 , respectively. The doped photocatalysts were all superior to the undoped ZnO-Fe 2 O 3 . The efficiency of Ag/N co-doped ZnO-Fe 2 O 3 photocatalysts was higher on the photodegradation of MB at optimum PH, the load of Methylene blue photocatalyst which is 78%.
{"title":"Synthesis and photocatalytic activity studies of Silver-Nitrogen co-doped ZnO-Fe2O3 nanocomposites for the degradation of Methylene blue under UV-Visible region","authors":"W. Kumala","doi":"10.13171/mjc107020071461wk","DOIUrl":"https://doi.org/10.13171/mjc107020071461wk","url":null,"abstract":"The binary systems of ZnO-Fe 2 O 3 nanocomposites were synthesized by a precipitation method with aqueous solutions of Fe and Zn nitrate, whereas nitrogen-doped ZnO-Fe 2 O 3 , silver-doped ZnO-Fe 2 O 3, and silver-nitrogen co-doped ZnO-Fe 2 O 3 nanocomposite were prepared by solid-state reaction. The structure and bandgap of the composites were studied using X-ray diffraction (XRD) and UV-visible diffuse reflectance spectroscopy (UV–vis). An aqueous model pollutant Methylene blue (MB) dye solution was used to evaluate photocatalytic degradation activities of the nanocomposites under visible light irradiation. Doping photocatalyst significantly increased the effectiveness of the photocatalyst in reducing bandgap energy. So 2.05 eV is the lowest energy, which is for Ag/N co-doped ZnO-Fe 2 O 3 photocatalysts. Results of the experiment that involved the photocatalysts revealed that Methylene blue degradations of 45.11%, 47%, 51%, and 64.5% in 180 min under light radiation using ZnO-Fe 2 O 3 , Ag-doped ZnO-Fe 2 O 3 , N-doped ZnO-Fe 2 O 3, and Ag/N co-doped ZnO-Fe 2 O 3 , respectively. The doped photocatalysts were all superior to the undoped ZnO-Fe 2 O 3 . The efficiency of Ag/N co-doped ZnO-Fe 2 O 3 photocatalysts was higher on the photodegradation of MB at optimum PH, the load of Methylene blue photocatalyst which is 78%.","PeriodicalId":18513,"journal":{"name":"Mediterranean Journal of Chemistry","volume":"21 1","pages":"659-667"},"PeriodicalIF":0.0,"publicationDate":"2020-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83206429","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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