Pub Date : 2020-08-05DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.21727
L. Mahardiani, S. Saputro, N. M. Zinki
Modification of a carboxylated activated carbon was obtained by simple one pot heat treatment method. This carboxylated activated carbon was confirmed by its physical and chemical structure. The efficiency of this carboxylated activated carbon was evaluated for adsorption of Cu(II) and Pb(II) based on their kinetic parameters to understand their adsorption mechanism. The pseudo-second-order model was the best fitted to describe the adsorption behavior of Cu(II) and Pb(II) indicating that chemisorption process took place during the adsorption. The adsorption capacity of Cu(II) and Pb(II) of carboxylated activated carbon was higher, which was 0.726 and 1.312 mg g -1 , respectively for CAC and 1.093 and 1.160 mg g -1 , respectively for PAC, compared to pristine AC, which was 0.314 and 0.365 mg g -1 , respectively.
{"title":"One Pot Synthesis of Carboxylated Activated Carbon for Water Purification: A Kinetic Study","authors":"L. Mahardiani, S. Saputro, N. M. Zinki","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.21727","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.21727","url":null,"abstract":"Modification of a carboxylated activated carbon was obtained by simple one pot heat treatment method. This carboxylated activated carbon was confirmed by its physical and chemical structure. The efficiency of this carboxylated activated carbon was evaluated for adsorption of Cu(II) and Pb(II) based on their kinetic parameters to understand their adsorption mechanism. The pseudo-second-order model was the best fitted to describe the adsorption behavior of Cu(II) and Pb(II) indicating that chemisorption process took place during the adsorption. The adsorption capacity of Cu(II) and Pb(II) of carboxylated activated carbon was higher, which was 0.726 and 1.312 mg g -1 , respectively for CAC and 1.093 and 1.160 mg g -1 , respectively for PAC, compared to pristine AC, which was 0.314 and 0.365 mg g -1 , respectively.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44331320","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 : 2020-08-05DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.17149
N. Aziane, M. Larif, Achraf Khaddari, M. Touhami, M. E. T. H. N. M. E. A. Khaddari
Summary Nitrates are highly soluble and highly mobile chemical elements in water. Their presence in groundwater with high concentrations frequently indicates anthropogenic contamination. They come mainly from the massive use of nitrogen fertilizers or unpurified urban waste. A physicochemical characterization of the nitrate and ammonium contents of the waters of the Mnasra aquifer was carried out following the sampling of 70 wells and boreholes during the months of June and July 2017. The results show high concentrations of nitrates, 82.85% of the wells taken will exceed the potability standard (50 mg / l). This is confirmed by the coarse nature and sandy soil texture that can promote nitrate leaching, the low water table in this region (70% of wells with depths less than 20 m), and the massive use of soil. fertilizers and fertilizers. The analysis of temporal trends in nitrate concentrations observed over 23 years showed a significant degradation of the water quality of wells between 1993 and 2017 with excessive levels reaching five to six times the potability limit.
{"title":"State of nitric pollution of the Mnasra aquifer, coastal zone of the Gharb plain (Morocco)","authors":"N. Aziane, M. Larif, Achraf Khaddari, M. Touhami, M. E. T. H. N. M. E. A. Khaddari","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.17149","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.17149","url":null,"abstract":"Summary Nitrates are highly soluble and highly mobile chemical elements in water. Their presence in groundwater with high concentrations frequently indicates anthropogenic contamination. They come mainly from the massive use of nitrogen fertilizers or unpurified urban waste. A physicochemical characterization of the nitrate and ammonium contents of the waters of the Mnasra aquifer was carried out following the sampling of 70 wells and boreholes during the months of June and July 2017. The results show high concentrations of nitrates, 82.85% of the wells taken will exceed the potability standard (50 mg / l). This is confirmed by the coarse nature and sandy soil texture that can promote nitrate leaching, the low water table in this region (70% of wells with depths less than 20 m), and the massive use of soil. fertilizers and fertilizers. The analysis of temporal trends in nitrate concentrations observed over 23 years showed a significant degradation of the water quality of wells between 1993 and 2017 with excessive levels reaching five to six times the potability limit.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49248388","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 : 2020-07-08DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.21073
T. Kamel, Abdennasser Baali, A. Couscous, O. Hakam, H. Mesrar, C. A. Babbou
In order to the conservation of soil resources and the preservation of water and biodiversity, the study of the variation of soil erodibility according to physico-chemical and biogeographical parameters in Allal Al Fassi watershed is of great importance. The measurement of soil erodibility according to the Wischmeier and Smith model requiring a series of physico-chemical analyses of several intrinsic soil parameters (texture, structure, permeability, organic matter content, etc.) is performed on 9 transects with 150 samples. The first, the results are combined with the biogeographical parameters of the soils (slope, pedology, lithology and land use) and then are submitted to a multivariate statistical analysis, were able to highlight both the qualitative and quantitative characteristics of the watershed. Soil erodibility in Allal Al Fassi watershed is moderately strong, ranging from 0.05 to 0.38 t. ha. h. ha -1 MJ -1 .m -1 . Statistical analysis shows that soil erodibility (K) is closely related to texture, organic matter content and especially land use. It is more important in farmland, unlike soils occupied by matorral. Soils become more erodible when the silty fraction dominates and clay and organic matter levels decrease.
为了保护土壤资源，保护水资源和生物多样性，根据理化和生物地理参数研究阿勒法西流域土壤可蚀性的变化具有重要意义。根据Wischmeier和Smith模型测量土壤可蚀性，需要对若干内在土壤参数(质地、结构、渗透性、有机质含量等)进行一系列物理化学分析，在9个样带上进行150个样品。首先，将结果与土壤的生物地理参数(坡度、土壤学、岩性和土地利用)相结合，然后进行多元统计分析，能够突出流域的定性和定量特征。Allal Al Fassi流域土壤可蚀性中等，在0.05 ~ 0.38 t / ha之间。h. ha -1 MJ -1。统计分析表明，土壤可蚀性(K)与土壤质地、有机质含量、尤其是土地利用方式密切相关。它在农田中更重要，不像土壤被物质所占据。当粉质部分占主导地位，粘土和有机质水平下降时，土壤变得更容易被侵蚀。
{"title":"Variation of soils erodibility according to physico-chemical and biogeographic parameters in Allal Al Fassi watershed, Middle Atlas, Morocco.","authors":"T. Kamel, Abdennasser Baali, A. Couscous, O. Hakam, H. Mesrar, C. A. Babbou","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.21073","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.21073","url":null,"abstract":"In order to the conservation of soil resources and the preservation of water and biodiversity, the study of the variation of soil erodibility according to physico-chemical and biogeographical parameters in Allal Al Fassi watershed is of great importance. The measurement of soil erodibility according to the Wischmeier and Smith model requiring a series of physico-chemical analyses of several intrinsic soil parameters (texture, structure, permeability, organic matter content, etc.) is performed on 9 transects with 150 samples. The first, the results are combined with the biogeographical parameters of the soils (slope, pedology, lithology and land use) and then are submitted to a multivariate statistical analysis, were able to highlight both the qualitative and quantitative characteristics of the watershed. Soil erodibility in Allal Al Fassi watershed is moderately strong, ranging from 0.05 to 0.38 t. ha. h. ha -1 MJ -1 .m -1 . Statistical analysis shows that soil erodibility (K) is closely related to texture, organic matter content and especially land use. It is more important in farmland, unlike soils occupied by matorral. Soils become more erodible when the silty fraction dominates and clay and organic matter levels decrease.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46606034","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 : 2020-07-06DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.21743
A. Koulou, M. Rbaa, N. Errahmany, F. Benhiba, Y. Lakhrissi, R. Touir, B. Lakhrissi, A. Zarrouk, M. Elyoubi
A two non-toxic biodegradable epoxy glucose derivatives, namely 5,6-anhydro-3-O-octa-1,2-O-isopropyli-dene-α-D-glucofuranose (EGC8) and 5,6-anhydro-3-O-butadecyl-1,2-O-isopropylidene-α-D-glucofuranose (EGC14), were prepared and characterized by using spectroscopic measurements. These products were tested for mild steel corrosion inhibition in 1.0 M HCl using electrochemical measurements. It is shown that these epoxy glucose derivatives affect the cathodic branches with a shift in the cathodic direction (cathodic - type). So, it found that their inhibition efficiency arise with concentrations to achieve a maximum of 93.2 % and 93.48 % at 10-3 M of EGC8 and EGC14, respectively, and they depends to the carbon number chain following the order : EGC14 > EGC8. Indeed, it is found that these compounds adsorb according the Langmuir’s adsorption isotherm. On the other hand, the temperature effect on the inhibition efficiency of the epoxy glucose derivatives indicated that they take them at high-rise temperature. In addition, the calculated kinetic and thermodynamic parameters have shown that EGC8 act via physical adsorption while EGC14 act via chemical adsorptions, and their process are endothermic and spontaneous.
制备了两种无毒可生物降解的环氧葡萄糖衍生物，即5,6-无水-3- o-辛-1,2- o-异丙烯-α- d -葡萄糖葡萄糖(EGC8)和5,6-无水-3- o-丁烷基-1,2- o-异丙烯-α- d -葡萄糖葡萄糖(EGC14)，并通过光谱测量对其进行了表征。用电化学测量方法对这些产品在1.0 M HCl中对低碳钢的缓蚀作用进行了测试。结果表明，这些环氧葡萄糖衍生物对阴极分支的影响是在阴极方向上发生偏移(阴极型)。因此，研究发现，它们的抑制效率随浓度的增加而增加，在EGC8和EGC14的浓度为10-3 M时，其抑制效率最高，分别为93.2%和93.48%，并且与碳数链的顺序有关:EGC14 bb0 EGC8。事实上，我们发现这些化合物的吸附符合Langmuir吸附等温线。另一方面，温度对环氧葡萄糖衍生物缓蚀效率的影响表明它们在高温下进行缓蚀。此外，计算的动力学和热力学参数表明，EGC8通过物理吸附作用，而EGC14通过化学吸附作用，其过程是吸热自发的。
{"title":"Synthesis of new epoxy glucose derivatives as inhibitor for mild steel corrosion in 1.0 M HCl, Experimental study: Part -1","authors":"A. Koulou, M. Rbaa, N. Errahmany, F. Benhiba, Y. Lakhrissi, R. Touir, B. Lakhrissi, A. Zarrouk, M. Elyoubi","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.21743","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.21743","url":null,"abstract":"A two non-toxic biodegradable epoxy glucose derivatives, namely 5,6-anhydro-3-O-octa-1,2-O-isopropyli-dene-α-D-glucofuranose (EGC8) and 5,6-anhydro-3-O-butadecyl-1,2-O-isopropylidene-α-D-glucofuranose (EGC14), were prepared and characterized by using spectroscopic measurements. These products were tested for mild steel corrosion inhibition in 1.0 M HCl using electrochemical measurements. It is shown that these epoxy glucose derivatives affect the cathodic branches with a shift in the cathodic direction (cathodic - type). So, it found that their inhibition efficiency arise with concentrations to achieve a maximum of 93.2 % and 93.48 % at 10-3 M of EGC8 and EGC14, respectively, and they depends to the carbon number chain following the order : EGC14 > EGC8. Indeed, it is found that these compounds adsorb according the Langmuir’s adsorption isotherm. On the other hand, the temperature effect on the inhibition efficiency of the epoxy glucose derivatives indicated that they take them at high-rise temperature. In addition, the calculated kinetic and thermodynamic parameters have shown that EGC8 act via physical adsorption while EGC14 act via chemical adsorptions, and their process are endothermic and spontaneous.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46197767","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 : 2020-07-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.20579
H. Lafridi, A. Oussa, H. Zgou, M. Bouachrine
This paper describes a quantitative structure – activity relationship study of the antiradical properties of 31 flavonoids belonging to different groups such as: flavonols, flavonones, dihydroflavonols and biflavonones. Using density functional theory (DFT) calculations, some structural characteristics such as frontier molecular orbitals, molecular descriptors, have been studied. To gain insights into the chemical structure and property of the studied compounds, many types of descriptors are generated by using DFT/B3LYP 6-31G(d,p) and other software. Also, The Principle Component Analysis (PCA), Multiple Linear and Nonlinear Regression (MLR and MNLR), and Artificial Neural Network (ANN) have been investigated to select the descriptors, and to generate the correlation models that relate the structural feature to the biological activity. The statistical results of the MLR, MNLR, and ANN indicate that the determination coefficient R 2 were 0.811, 0.646, 0.982, respectively. A good correlation coefficient is obtained, and the antiradical activities of these compounds are well predicted. These models are expected to be useful for screening of polyphenolic antioxidants.
{"title":"QSAR modeling of antiradical properties of phenolic compounds using DFT calculations","authors":"H. Lafridi, A. Oussa, H. Zgou, M. Bouachrine","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.20579","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.20579","url":null,"abstract":"This paper describes a quantitative structure – activity relationship study of the antiradical properties of 31 flavonoids belonging to different groups such as: flavonols, flavonones, dihydroflavonols and biflavonones. Using density functional theory (DFT) calculations, some structural characteristics such as frontier molecular orbitals, molecular descriptors, have been studied. To gain insights into the chemical structure and property of the studied compounds, many types of descriptors are generated by using DFT/B3LYP 6-31G(d,p) and other software. Also, The Principle Component Analysis (PCA), Multiple Linear and Nonlinear Regression (MLR and MNLR), and Artificial Neural Network (ANN) have been investigated to select the descriptors, and to generate the correlation models that relate the structural feature to the biological activity. The statistical results of the MLR, MNLR, and ANN indicate that the determination coefficient R 2 were 0.811, 0.646, 0.982, respectively. A good correlation coefficient is obtained, and the antiradical activities of these compounds are well predicted. These models are expected to be useful for screening of polyphenolic antioxidants.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46812411","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 : 2020-07-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.18311
M. Sabbahi, A. El-Hassouni, A. Tahani, A. EL-BACHIRI
The Rosmarinus officinalis (rosemary) is an evergreen shrub used worldwide for its aromatic and medicinal virtues. It plays an important role in the local economy of Talsint (Eastern Morocco). Even though, forest managers and decision makers are short of information and scientific indicators to accurately understand how the chemical composition of rosemary varies in the region. Hence, the aim of this work is to study the effect of altitude gradient over the chemical composition of the rosemary essential oil and its antioxidant activity. In this study, eight samples of wild population of rosemary were collected from different altitudes in the High Atlas Mountains in the region of Talsint in order to determine the chemical composition and antioxidant activity of their essential oils. The volatile profiles were determined by Gas chromatography–mass spectrometry (GC-MS), meanwhile, the antioxidant activity to scavenge the free radicals was pointed out by 1,1- diphenyl-1-picrylhydrazyl (DPPH) assay. Based upon our analysis, the major constituents are 1,8-Cineole (50.60-64.27%), Camphor (1.77-14.12%), α-Pinene (6.61-9.02%), and Borneol (1.98-6.20%). Except the 1,8-Cineole, the altitude effect remains unclear for the other constituents. On the other hand, the essential oils of Talsint rosemary showed considerable antioxidant activity.
{"title":"Altitude effect on the chemical composition and antioxidant activity of rosemary in the region of Talsint (Morocco).","authors":"M. Sabbahi, A. El-Hassouni, A. Tahani, A. EL-BACHIRI","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.18311","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.18311","url":null,"abstract":"The Rosmarinus officinalis (rosemary) is an evergreen shrub used worldwide for its aromatic and medicinal virtues. It plays an important role in the local economy of Talsint (Eastern Morocco). Even though, forest managers and decision makers are short of information and scientific indicators to accurately understand how the chemical composition of rosemary varies in the region. Hence, the aim of this work is to study the effect of altitude gradient over the chemical composition of the rosemary essential oil and its antioxidant activity. In this study, eight samples of wild population of rosemary were collected from different altitudes in the High Atlas Mountains in the region of Talsint in order to determine the chemical composition and antioxidant activity of their essential oils. The volatile profiles were determined by Gas chromatography–mass spectrometry (GC-MS), meanwhile, the antioxidant activity to scavenge the free radicals was pointed out by 1,1- diphenyl-1-picrylhydrazyl (DPPH) assay. Based upon our analysis, the major constituents are 1,8-Cineole (50.60-64.27%), Camphor (1.77-14.12%), α-Pinene (6.61-9.02%), and Borneol (1.98-6.20%). Except the 1,8-Cineole, the altitude effect remains unclear for the other constituents. On the other hand, the essential oils of Talsint rosemary showed considerable antioxidant activity.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47394541","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 : 2020-07-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.20720
A. Barhoumi, M. idrissi, S. Bakkas, A. Zeroual, A. Tounsi, A. Hajbi
The reaction of diethyl trichloro-methyl phosphonate (C1) with diphenyl methyl phosphinite (C2), has been scrutinized within the Density Function Theory at the B3LYP/6-311(d,p) computational level. The regiosomeric reaction paths involving the two center of compound (C1) have been studied. DFT calculations account for the high regioselectivity in the chlorine atom, in complete agreement with the experimental outcomes.
{"title":"A DFT study of the mechanism and regioselectivity of the reaction between diethyl trichloro-methyl phosphonate and diphenyl methyl phosphinite","authors":"A. Barhoumi, M. idrissi, S. Bakkas, A. Zeroual, A. Tounsi, A. Hajbi","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.20720","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.20720","url":null,"abstract":"The reaction of diethyl trichloro-methyl phosphonate (C1) with diphenyl methyl phosphinite (C2), has been scrutinized within the Density Function Theory at the B3LYP/6-311(d,p) computational level. The regiosomeric reaction paths involving the two center of compound (C1) have been studied. DFT calculations account for the high regioselectivity in the chlorine atom, in complete agreement with the experimental outcomes.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43632872","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 : 2020-07-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.21637
A. Nandiyanto, R. Ragadhita, I. Istadi
The purpose of this study was to evaluate the feasibility studies on the production of silica from agricultural wastes ( i.e. rice husk, rice straw, bagasse, and corn cob) from engineering and economic perspectives. The engineering perspective was done by calculating stoichiometry, mass balance, and the preliminary plant design evaluation, whereas the economic perspective analysis was performed by calculating various economic parameters ( i.e., Gross Profit Margin, Internal Rate Return, Break Even Point, Payback Period, and Cumulative Net Present Value) under various conditions. The results from engineering perspective showed that the project is applicable even in the home-scale production. The project is potentially scaled up since it can be executed using commercially available and inexpensive equipment. Economic analysis showed that various agricultural wastes gave positive impacts on profitability, confirmed by the various economic evaluation parameters. Based on the evaluation from various agricultural wastes, rice husk is the best raw materials for gaining the highest interest, whereas corn cob is the worst. To confirm the analysis, various economic conditions under different raw material costs, utility costs, labor, and sales, as well as taxes, were added into the calculation, and they showed positive values for the potential production of silica particles. Although the evaluation confirmed for the excellent economic parameter values, further analysis of this project must be carried out to determine the uncertainty of conditions existing during the realistic project.
{"title":"Techno-economic Analysis for the Production of Silica Particles from Agricultural Wastes","authors":"A. Nandiyanto, R. Ragadhita, I. Istadi","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.21637","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.21637","url":null,"abstract":"The purpose of this study was to evaluate the feasibility studies on the production of silica from agricultural wastes ( i.e. rice husk, rice straw, bagasse, and corn cob) from engineering and economic perspectives. The engineering perspective was done by calculating stoichiometry, mass balance, and the preliminary plant design evaluation, whereas the economic perspective analysis was performed by calculating various economic parameters ( i.e., Gross Profit Margin, Internal Rate Return, Break Even Point, Payback Period, and Cumulative Net Present Value) under various conditions. The results from engineering perspective showed that the project is applicable even in the home-scale production. The project is potentially scaled up since it can be executed using commercially available and inexpensive equipment. Economic analysis showed that various agricultural wastes gave positive impacts on profitability, confirmed by the various economic evaluation parameters. Based on the evaluation from various agricultural wastes, rice husk is the best raw materials for gaining the highest interest, whereas corn cob is the worst. To confirm the analysis, various economic conditions under different raw material costs, utility costs, labor, and sales, as well as taxes, were added into the calculation, and they showed positive values for the potential production of silica particles. Although the evaluation confirmed for the excellent economic parameter values, further analysis of this project must be carried out to determine the uncertainty of conditions existing during the realistic project.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46529902","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 : 2020-07-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I3.21644
B. Sefati, M. Masrournia, Z. Es’haghi, M. Bozorgmehr
A method for applicability of the solid phase microextraction (SPME) procedure for determination of trace amounts of the organophosphorus pesticide malathion by gas chromatography - mass spectrometry (GC-MS) was developed. Graphene oxide reinforced sol–gel which was placed in hollow fiber (HF-SPME) was used for pre-concentration of malathion. In the present study the Plackett-Burman (PB) factorial design was used as a method for first monitoring of Eight factors that have a significant impact and optimized them in next stage, optimization process of significant factor was carried out using a five-level CCD after screening by PBD. the following conditions were selected for the analytical method of Malathion in real sample: amount of GO (0.01gr), pH of aqueous solution (pH: 3), volume of aqueous solution (10000 µl), volume of organic solvent (250 µl), adsorption time (35 min), desorption time (30 min), stirring rate of solution (1000 rpm) and amount of salt (4%). Calibration curves were plotted using three spiking levels of malathion in the concentration ranges of 0.2–0.4-0.5 ng/mL with correlation coefficients (r 2 ) 0.9914 for analytes. Under the optimized extraction conditions, the method showed good linearity (0.05–0.5 ng/mL), repeatability, low limits of detections (3.9×10 -3 ng/mL) and excellent pre-concentration factors (4000). The optimum conditions which were evaluated then applied for the analysis of malathion in the rice as a real sample
{"title":"Malathion determination in Rice samples with Graphene oxide reinforced hollow fiber-solid phase microextraction by GC-MASS","authors":"B. Sefati, M. Masrournia, Z. Es’haghi, M. Bozorgmehr","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I3.21644","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I3.21644","url":null,"abstract":"A method for applicability of the solid phase microextraction (SPME) procedure for determination of trace amounts of the organophosphorus pesticide malathion by gas chromatography - mass spectrometry (GC-MS) was developed. Graphene oxide reinforced sol–gel which was placed in hollow fiber (HF-SPME) was used for pre-concentration of malathion. In the present study the Plackett-Burman (PB) factorial design was used as a method for first monitoring of Eight factors that have a significant impact and optimized them in next stage, optimization process of significant factor was carried out using a five-level CCD after screening by PBD. the following conditions were selected for the analytical method of Malathion in real sample: amount of GO (0.01gr), pH of aqueous solution (pH: 3), volume of aqueous solution (10000 µl), volume of organic solvent (250 µl), adsorption time (35 min), desorption time (30 min), stirring rate of solution (1000 rpm) and amount of salt (4%). Calibration curves were plotted using three spiking levels of malathion in the concentration ranges of 0.2–0.4-0.5 ng/mL with correlation coefficients (r 2 ) 0.9914 for analytes. Under the optimized extraction conditions, the method showed good linearity (0.05–0.5 ng/mL), repeatability, low limits of detections (3.9×10 -3 ng/mL) and excellent pre-concentration factors (4000). The optimum conditions which were evaluated then applied for the analysis of malathion in the rice as a real sample","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42891245","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 : 2020-07-02DOI: 10.48317/IMIST.PRSM/MORJCHEM-V8I4.21594
A. El-Shamy, M. El-Hadek, A. Nassef, R. El-Bindary
Recently, the production of green corrosion inhibitors and green inhibition strategies is highly demanded in the field of science and technology due to the growing demand of green chemistry. Usage of plant extracts as metallic corrosion inhibitors has attracted considerable attention in the last few decades. Plant products are perfect green candidates for replacing traditional toxic corrosion inhibitors. Reduced environmental risk, lower cost, widespread availability and high corrosion inhibition efficiency make plant extracts ideal candidates for the substitution of costly and harmful traditional synthetic corrosion inhibitors. An aqueous extract of plant material Henna (Lawsonia Inermis) powder was used as a corrosion inhibitor to control the corrosion of high strength steel immersed in an aqueous solution containing 35000 ppm Cl − , by electrochemical methods in the absence and presence of the inhibitor. Lawsone is the principal constituent of this plant extract. This has excellent efficiency in inhibition and displays excellent IE at neutral pH. Electro-chemical experiments such as potentiodynamic polarization and impedance were used to describe the mechanistic aspects of corrosion inhibitions. Box-Behnken method was used to investigate the effect of key parameters (i.e. concentration of inhibitors, temperature, and speed of rotation) on the efficiency of inhibition and corrosion rate of high strength steel alloy in 3.5 wt.% NaCl solutions. From electrochemical measurements and statistical analysis, it was found that the efficacy of inhibition improves with higher inhibitor concentration, low rotation speed and low temperature. The Lawsonia Inermis extracted demonstrated strong corrosion inhibition in saline media for high strength steel alloy and reached 81.68.
{"title":"Box-Behnken design to enhance the corrosion resistance of high strength steel alloy in 3.5 wt.% NaCl solution","authors":"A. El-Shamy, M. El-Hadek, A. Nassef, R. El-Bindary","doi":"10.48317/IMIST.PRSM/MORJCHEM-V8I4.21594","DOIUrl":"https://doi.org/10.48317/IMIST.PRSM/MORJCHEM-V8I4.21594","url":null,"abstract":"Recently, the production of green corrosion inhibitors and green inhibition strategies is highly demanded in the field of science and technology due to the growing demand of green chemistry. Usage of plant extracts as metallic corrosion inhibitors has attracted considerable attention in the last few decades. Plant products are perfect green candidates for replacing traditional toxic corrosion inhibitors. Reduced environmental risk, lower cost, widespread availability and high corrosion inhibition efficiency make plant extracts ideal candidates for the substitution of costly and harmful traditional synthetic corrosion inhibitors. An aqueous extract of plant material Henna (Lawsonia Inermis) powder was used as a corrosion inhibitor to control the corrosion of high strength steel immersed in an aqueous solution containing 35000 ppm Cl − , by electrochemical methods in the absence and presence of the inhibitor. Lawsone is the principal constituent of this plant extract. This has excellent efficiency in inhibition and displays excellent IE at neutral pH. Electro-chemical experiments such as potentiodynamic polarization and impedance were used to describe the mechanistic aspects of corrosion inhibitions. Box-Behnken method was used to investigate the effect of key parameters (i.e. concentration of inhibitors, temperature, and speed of rotation) on the efficiency of inhibition and corrosion rate of high strength steel alloy in 3.5 wt.% NaCl solutions. From electrochemical measurements and statistical analysis, it was found that the efficacy of inhibition improves with higher inhibitor concentration, low rotation speed and low temperature. The Lawsonia Inermis extracted demonstrated strong corrosion inhibition in saline media for high strength steel alloy and reached 81.68.","PeriodicalId":18768,"journal":{"name":"Moroccan Journal of Chemistry","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42040729","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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