Pub Date : 2019-10-25DOI: 10.33945/SAMI/AJCA.2020.4.4
K. M. A. Haque, M. Siddique, A. Jamal, A. Islam
Geochemical study of toxic metal arsenic along with heavy metals (Fe. Mn and Cu), of borehole sediments of the Kushiara and Meghna, rivers in Bangladesh was conducted to investigate the mobilization, distribution and correlation of arsenic with depth, nature of sediment and locations of sampling site, had been included to the study. The Kushiara is the upstream part of Meghna river. Sampling locations were carried out at Sherpur (Moulvibazar) and Beanibazar (Sylhet) for Kushiara river, which is one of the upper stream part of Meghna river. Samplings of borehole sediments collection have been done from Mohonpur (Chandpur) and Chandpur town (Chandpur) for the Meghna river. The borehole sediments were dried in the oven till constant weight and digested it nitric and perchloric acid (3:2) in fume cup hood in the laboratory. The digested sample were analyzed by Ag-DDTC UV visible Spectrophotmeter for arsenic also analysis of Fe. Mn and Cu in borehole sediment by Flame AAS. The average concentration of arsenic was found 6.39 mg/Kg in Borehole sediment for Kushiara river (Beanibazar and Sherpur), 5.00 mg/Kg for Meghna river (Mohonpur and Chandpur). The highest amount of arsenic (12.30 mg/Kg) was found in grayish clay type sediment at upstream of Kushiara river at Beanibazar. It is evident from the study, that arsenic is mobilized from upper stream to lower stream. In addition, it also reveals that high amount of Fe and Mn was in sediment sample. Statistical analysis shows that arsenic is strongly correlated with Mn and Fe but weakly correlated with Cu. In nature FeOOH occurs is yellowish in color and MnOOH is gray in color, these two of oxy-hydroxides may be scavengers of arsenic. It was indicated that the occurrence of FeSO4, MnSO4 and CuSO4 is predominant in all of the borehole sediment of Kushiara and Meghna rivers.
{"title":"Mobilization and Distribution of Arsenic with Other Metal Ions at Upstream and Downstream of River Meghna","authors":"K. M. A. Haque, M. Siddique, A. Jamal, A. Islam","doi":"10.33945/SAMI/AJCA.2020.4.4","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2020.4.4","url":null,"abstract":"Geochemical study of toxic metal arsenic along with heavy metals (Fe. Mn and Cu), of borehole sediments of the Kushiara and Meghna, rivers in Bangladesh was conducted to investigate the mobilization, distribution and correlation of arsenic with depth, nature of sediment and locations of sampling site, had been included to the study. The Kushiara is the upstream part of Meghna river. Sampling locations were carried out at Sherpur (Moulvibazar) and Beanibazar (Sylhet) for Kushiara river, which is one of the upper stream part of Meghna river. Samplings of borehole sediments collection have been done from Mohonpur (Chandpur) and Chandpur town (Chandpur) for the Meghna river. The borehole sediments were dried in the oven till constant weight and digested it nitric and perchloric acid (3:2) in fume cup hood in the laboratory. The digested sample were analyzed by Ag-DDTC UV visible Spectrophotmeter for arsenic also analysis of Fe. Mn and Cu in borehole sediment by Flame AAS. The average concentration of arsenic was found 6.39 mg/Kg in Borehole sediment for Kushiara river (Beanibazar and Sherpur), 5.00 mg/Kg for Meghna river (Mohonpur and Chandpur). The highest amount of arsenic (12.30 mg/Kg) was found in grayish clay type sediment at upstream of Kushiara river at Beanibazar. It is evident from the study, that arsenic is mobilized from upper stream to lower stream. In addition, it also reveals that high amount of Fe and Mn was in sediment sample. Statistical analysis shows that arsenic is strongly correlated with Mn and Fe but weakly correlated with Cu. In nature FeOOH occurs is yellowish in color and MnOOH is gray in color, these two of oxy-hydroxides may be scavengers of arsenic. It was indicated that the occurrence of FeSO4, MnSO4 and CuSO4 is predominant in all of the borehole sediment of Kushiara and Meghna rivers.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74894330","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.1
F. Mohammadi, M. Yousefi, R. Ghahremanzadeh
Green synthesis of silver nanoparticles using the aqueous extract of Ferula gumosa, Ferula latisecta, Teucrium polium and Trachomitum venetum leaves and stems extract as the reducing and stabilizing agents. This synthesis shows attractive characteristics such as; the use of inexpensive and available plant extracts, non-toxicity, eco-friendly biological materials, and operational simplicity. The extracts incubated with AgNO3 solution showed gradual change in color of the extracts to yellowish brown, with intensity increasing during the period of incubation. The nanoparticles were characterized by UV–visible absorption spectroscopy, X-ray diffraction (XRD) spectroscopy, Dynamic Light Scattering (DLS), and Transmission Electron Microscope (TEM). The silver nanoparticles synthesized were generally found to be spherical in shape with variable size ranging from 5 to 30 nm, as evident by TEM. The biosynthesized silver nanoparticles (AgNPs) showed good antibacterial activity against clinical strains of two bacteria Staphylococcus aureus and Escherichia coli.
{"title":"Green synthesis, characterization and antimicrobial activity of silver nanoparticles (AgNPs) using leaves and stems extract of some plants","authors":"F. Mohammadi, M. Yousefi, R. Ghahremanzadeh","doi":"10.33945/SAMI/AJCA.2019.4.1","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.1","url":null,"abstract":"Green synthesis of silver nanoparticles using the aqueous extract of Ferula gumosa, Ferula latisecta, Teucrium polium and Trachomitum venetum leaves and stems extract as the reducing and stabilizing agents. This synthesis shows attractive characteristics such as; the use of inexpensive and available plant extracts, non-toxicity, eco-friendly biological materials, and operational simplicity. The extracts incubated with AgNO3 solution showed gradual change in color of the extracts to yellowish brown, with intensity increasing during the period of incubation. The nanoparticles were characterized by UV–visible absorption spectroscopy, X-ray diffraction (XRD) spectroscopy, Dynamic Light Scattering (DLS), and Transmission Electron Microscope (TEM). The silver nanoparticles synthesized were generally found to be spherical in shape with variable size ranging from 5 to 30 nm, as evident by TEM. The biosynthesized silver nanoparticles (AgNPs) showed good antibacterial activity against clinical strains of two bacteria Staphylococcus aureus and Escherichia coli.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"97 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88521347","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.2
H. Alemam, A. Omar, Magdi M. Gibali, Abdurrhman. A. Abdullaakarem, Farouq. A. Alastay, Ehabeddin Elftisi, A. Abushita
Tobacco products are known to contain some heavy metals that pose threats to smokers. In order to assess the role of smoking habits in increasing the plasma concentration of cadmium (Cd), chromium (Cr) and lead (Pb), a comparative study between male smokers and nonsmokers was carried out in Tripoli, Libya. Graphite furnace atomic absorption spectrometry (GFAAS) was used to determine the concentration of Cd, Cr and Pb in plasma blood of 25 male nonsmokers representing control group, and of 75 male smokers divided equally into three subgroups, which were: cigarette smokers group, waterpipe group and snuff inhalers group. According to 2-sample test, the means (or the medinas) of Cd, Cr and Pb plasma concentrations were significantly higher in smokers group compared to the nonsmokers group, and as the one-way analysis of Variance (ANOVA) test revealed, the means of Cd, Cr and Pb plasma concentrations were significantly higher in waterpipe group compared to the other two smokers’ groups. In conclusion, smoking increased the plasma concentration of Cd, Cr and Pb, and smoking waterpipe is considered to elevate the plasma concentration of those three metals more than the other two smoking habits, thus it is more dangerous on smokers’ lives.
{"title":"Plasma concentration of cadmium, lead and chromium in smokers and nonsmokers in Tripoli, Libya: A comparative study","authors":"H. Alemam, A. Omar, Magdi M. Gibali, Abdurrhman. A. Abdullaakarem, Farouq. A. Alastay, Ehabeddin Elftisi, A. Abushita","doi":"10.33945/SAMI/AJCA.2019.4.2","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.2","url":null,"abstract":"Tobacco products are known to contain some heavy metals that pose threats to smokers. In order to assess the role of smoking habits in increasing the plasma concentration of cadmium (Cd), chromium (Cr) and lead (Pb), a comparative study between male smokers and nonsmokers was carried out in Tripoli, Libya. Graphite furnace atomic absorption spectrometry (GFAAS) was used to determine the concentration of Cd, Cr and Pb in plasma blood of 25 male nonsmokers representing control group, and of 75 male smokers divided equally into three subgroups, which were: cigarette smokers group, waterpipe group and snuff inhalers group. According to 2-sample test, the means (or the medinas) of Cd, Cr and Pb plasma concentrations were significantly higher in smokers group compared to the nonsmokers group, and as the one-way analysis of Variance (ANOVA) test revealed, the means of Cd, Cr and Pb plasma concentrations were significantly higher in waterpipe group compared to the other two smokers’ groups. In conclusion, smoking increased the plasma concentration of Cd, Cr and Pb, and smoking waterpipe is considered to elevate the plasma concentration of those three metals more than the other two smoking habits, thus it is more dangerous on smokers’ lives.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90080223","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.9
Ibrahim Ali Ahmed Amar, Zohour Mohamed Alshibani, M. Abdulqadir, I. Abdalsamed, F. Altohami
In the present study, Zn-doped cobalt ferrite (CoFe1.9Zn0.1O4) magnetic nanoparticles were successfully synthesized via sol-gel method. The prepared materials were characterized using X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The apparent density and magnetic force of CoFe1.9Zn0.1O4 nanoparticles were determined. The results revealed that the prepared materials display an adequate density and considerable magnetic force. The gravimetric oil removal capability tests were also performed to investigate the oil absorption properties of CoFe1.9Zn0.1O4 nanoparticles using four types of oil samples (crude, diesel, gasoline and hydraulic oil) as water pollutant’s model. The oil removal capabilities of the prepared absorbent were found to be 13.72 ± 0.42-5.50 ± 0.53 g/g, 14.99 ± 0.95-8.86 ± 0.42 g/g, 18.23 ± 1.01-8.06 ± 1.26 g/g and 10.58 ± 0.49-5.24 ± 0.31 g/g for crude, diesel engine, gasoline engine and hydraulic oil, respectively. The results suggest that the prepared magnetic nanoparticles can be used as absorbent materials for removing oil spills from water surface.
{"title":"Oil Spill Removal from Water by Absorption on Zinc-Doped Cobalt Ferrite Magnetic Nanoparticles","authors":"Ibrahim Ali Ahmed Amar, Zohour Mohamed Alshibani, M. Abdulqadir, I. Abdalsamed, F. Altohami","doi":"10.33945/SAMI/AJCA.2019.4.9","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.9","url":null,"abstract":"In the present study, Zn-doped cobalt ferrite (CoFe1.9Zn0.1O4) magnetic nanoparticles were successfully synthesized via sol-gel method. The prepared materials were characterized using X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The apparent density and magnetic force of CoFe1.9Zn0.1O4 nanoparticles were determined. The results revealed that the prepared materials display an adequate density and considerable magnetic force. The gravimetric oil removal capability tests were also performed to investigate the oil absorption properties of CoFe1.9Zn0.1O4 nanoparticles using four types of oil samples (crude, diesel, gasoline and hydraulic oil) as water pollutant’s model. The oil removal capabilities of the prepared absorbent were found to be 13.72 ± 0.42-5.50 ± 0.53 g/g, 14.99 ± 0.95-8.86 ± 0.42 g/g, 18.23 ± 1.01-8.06 ± 1.26 g/g and 10.58 ± 0.49-5.24 ± 0.31 g/g for crude, diesel engine, gasoline engine and hydraulic oil, respectively. The results suggest that the prepared magnetic nanoparticles can be used as absorbent materials for removing oil spills from water surface.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83960394","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.3
M. Rabah
This study reports on the thermal dislocation and crystal growth changes during preparation of active metasilicate of group 2 periods 3.4 and 5 elements from waste fines of finishing process of crystal glass (CG) industry. Sodium carbonate fused the fines at ≈1273 K for 120-180 minutes followed by water leaching. Alkali silicate goes into solution. Primary chloride and sulphate salts of elements of group 2 periods 2, 4 and 5 added to the alkali silicate solution at temperatures 300 K to 353 K for 60 minutes to give metasilicate as a white precipitate followed by heating at 473 K to 1073 K for 30 minutes. The study discussed the physical changes taking place after heating. Results revealed that surface area and adsorption capacity of Mn ions from underground water increased with the surface area of the silicate associating the decrease in atomic radius of the element. The effect of pH, concentration of the reactants and temperature on the synthesis and physical changes of the silicate salts has been investigated. Formation of the silicate salt proceeded in a reaction sequence involving atom rearrangement to form a honeycomb structure with very narrow pore diameter amounting to 1.538 Ằ. Heating silicate at 773 K dislocate the oxygen atoms around metal atoms to form unit crystals with mild pore diameter of 15.29 Ằ. With further increase in temperature, narrow pore system collapses to form sponge structure with wider pore diameter and lower surface area. The manuscript tabulated the physical changes in digital presentation derived mathematically.
{"title":"Thermal dislocation and physical changes during preparation of active silicate of group 2 Periods 3, 4 and 5 elements from spent fines of finishing crystal glass","authors":"M. Rabah","doi":"10.33945/SAMI/AJCA.2019.4.3","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.3","url":null,"abstract":"This study reports on the thermal dislocation and crystal growth changes during preparation of active metasilicate of group 2 periods 3.4 and 5 elements from waste fines of finishing process of crystal glass (CG) industry. Sodium carbonate fused the fines at ≈1273 K for 120-180 minutes followed by water leaching. Alkali silicate goes into solution. Primary chloride and sulphate salts of elements of group 2 periods 2, 4 and 5 added to the alkali silicate solution at temperatures 300 K to 353 K for 60 minutes to give metasilicate as a white precipitate followed by heating at 473 K to 1073 K for 30 minutes. The study discussed the physical changes taking place after heating. Results revealed that surface area and adsorption capacity of Mn ions from underground water increased with the surface area of the silicate associating the decrease in atomic radius of the element. The effect of pH, concentration of the reactants and temperature on the synthesis and physical changes of the silicate salts has been investigated. Formation of the silicate salt proceeded in a reaction sequence involving atom rearrangement to form a honeycomb structure with very narrow pore diameter amounting to 1.538 Ằ. Heating silicate at 773 K dislocate the oxygen atoms around metal atoms to form unit crystals with mild pore diameter of 15.29 Ằ. With further increase in temperature, narrow pore system collapses to form sponge structure with wider pore diameter and lower surface area. The manuscript tabulated the physical changes in digital presentation derived mathematically.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73589873","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.7
M. Mohamed
The current study aimed to develop and new, simple, accurate, economical and stability-indicating RP-HPLC for simultaneous estimation of Amlodipine Besylate, Valsartan and its related substances in their film-coated tablets dosage form. Chromatographic system was performed on the YMC ODS-A C18 (150 mm × 4.6 mm, 5μm particle size) using a binary gradient elution consist of two solvent systems, solution (A) 0.02 monobasic sodium phosphate Adjust with phosphoric acid to a pH of 2.5. and solution (B) consisting of Solution A: Acetonitrile (45:55). at a flow rate of 1.0 mL/min, injection volume 10 µL, UV detection at 235 nm, column oven temperature 30 oC and autosampler temperature 10 oC. This method was validated according to ICH requirements for new methods, which include accuracy, precision, selectivity, robustness, ruggedness, LOD, LOQ, linearity and range. Linear relationships were obtained in the ranges of 10-300 µg/mL and 5-200 µg/mL with correlation coefficients of 0.9997 and 0.9998 for Amlodipine Besylate and Valsartan respectively. The forced degradation studies as acidity, alkalinity, oxidation, heat, thermal, humidity and photodegradation were performed according to ICH guidelines.
本研究旨在建立一种简便、准确、经济、稳定的反相高效液相色谱法，用于同时测定苯磺酸氨氯地平、缬沙坦及其相关物质薄膜包衣片剂型。色谱系统在YMC ODS-A C18 (150 mm × 4.6 mm, 5μm粒径)上进行，采用二元梯度洗脱，两种溶剂体系组成，溶液(a) 0.02磷酸一碱钠，用磷酸调节至pH为2.5。溶液(B)由溶液A:乙腈(45:55)组成。流速1.0 mL/min，进样量10µL，紫外检测波长235 nm，柱箱温度30℃，自动进样器温度10℃。根据ICH对新方法的要求对该方法进行了验证，包括准确度、精密度、选择性、鲁棒性、坚固性、LOD、LOQ、线性和范围。苯磺酸氨氯地平和缬沙坦在10 ~ 300µg/mL和5 ~ 200µg/mL范围内呈线性关系，相关系数分别为0.9997和0.9998。强制降解研究如酸度、碱度、氧化、热、热、湿度和光降解根据ICH指南进行。
{"title":"Simultaneous Determination of Amlodipine Besylate, Valsartan, and Its Related Substances in Their Film-Coated Tablets Dosage form by RP-HPLC Method","authors":"M. Mohamed","doi":"10.33945/SAMI/AJCA.2019.4.7","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.7","url":null,"abstract":"The current study aimed to develop and new, simple, accurate, economical and stability-indicating RP-HPLC for simultaneous estimation of Amlodipine Besylate, Valsartan and its related substances in their film-coated tablets dosage form. Chromatographic system was performed on the YMC ODS-A C18 (150 mm × 4.6 mm, 5μm particle size) using a binary gradient elution consist of two solvent systems, solution (A) 0.02 monobasic sodium phosphate Adjust with phosphoric acid to a pH of 2.5. and solution (B) consisting of Solution A: Acetonitrile (45:55). at a flow rate of 1.0 mL/min, injection volume 10 µL, UV detection at 235 nm, column oven temperature 30 oC and autosampler temperature 10 oC. This method was validated according to ICH requirements for new methods, which include accuracy, precision, selectivity, robustness, ruggedness, LOD, LOQ, linearity and range. Linear relationships were obtained in the ranges of 10-300 µg/mL and 5-200 µg/mL with correlation coefficients of 0.9997 and 0.9998 for Amlodipine Besylate and Valsartan respectively. The forced degradation studies as acidity, alkalinity, oxidation, heat, thermal, humidity and photodegradation were performed according to ICH guidelines.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83247427","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.4
M. Taher, Adele Amine, Bassam Khalaf Damarany
For many years of production of phosphate fertilizer very large amounts of phosphogypsum (PG) occupied large area, causing chemical and radiological environmental. Using of PG in building materials represents a good method for lowering the cost of cement production and dispose of phosphogypsum as chemical and radioactive waste. Fresh wet hemihydrate phosphogypsum, cement and pozzolana additive were mechanically activated together and from mixing Portland pozzolanic cement (PPC) with PG, these mixes were prepared at different replacements (by weight) of raw gypsum (RG)with purified PG ranging from 1–5% . The purified PG was obtained by calcining PG at temperatures of 200, 400, 600, 800 and 1000 ᵒC. The compressive strength, bulk density, total porosity, combined water and free lime of different hardened mortars were obtained following 3, 7, 28 and 90 days of curing. In addition, the setting time of cement pastes. The highest percentage increase in strength was found to be for PG calcined at temperatures of 800 and 1000 ᵒC. The incorporation of PG in the cement paste has dramatically increased its initial and final setting times. FTIR spectroscopic analysis and scanning electron microscopy (SEM) were used for investigate the change in structure of mortars after curing and change in morphology and microstructure of some hardened pastes.
{"title":"Effect of partial substitution of raw gypsum with thermally treated phosphogypsum on the properties of Portland Pozzolanic Cement","authors":"M. Taher, Adele Amine, Bassam Khalaf Damarany","doi":"10.33945/SAMI/AJCA.2019.4.4","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.4","url":null,"abstract":"For many years of production of phosphate fertilizer very large amounts of phosphogypsum (PG) occupied large area, causing chemical and radiological environmental. Using of PG in building materials represents a good method for lowering the cost of cement production and dispose of phosphogypsum as chemical and radioactive waste. Fresh wet hemihydrate phosphogypsum, cement and pozzolana additive were mechanically activated together and from mixing Portland pozzolanic cement (PPC) with PG, these mixes were prepared at different replacements (by weight) of raw gypsum (RG)with purified PG ranging from 1–5% . The purified PG was obtained by calcining PG at temperatures of 200, 400, 600, 800 and 1000 ᵒC. The compressive strength, bulk density, total porosity, combined water and free lime of different hardened mortars were obtained following 3, 7, 28 and 90 days of curing. In addition, the setting time of cement pastes. The highest percentage increase in strength was found to be for PG calcined at temperatures of 800 and 1000 ᵒC. The incorporation of PG in the cement paste has dramatically increased its initial and final setting times. FTIR spectroscopic analysis and scanning electron microscopy (SEM) were used for investigate the change in structure of mortars after curing and change in morphology and microstructure of some hardened pastes.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76470607","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.6
M. Khan, L. M. Bala, M. Maliki
Phytochemical screening of Terminalia schimperiana (Combretaceae) Root Bark showed presence of flavonoids, tannins, steroid carbohydrates and terpenoides in n-hexane, ethylacetate and methanol as solvents of extraction. Isolated stigmasterol from Terminalia schimperiana was a white-yellow crystal which characterized using 1H-NMR, 13C-NMR, COSY, HSQC and HMBC spectral techniques. Research studies clearly revealed that Terminalia schimperiana root bark extract has potential to be exploited in the pharmaceutical firm in the search for stigmasterol related drug from nature.
{"title":"Phytochemical Analyses of Terminalia Schimperiana (combretaceae) Root Bark Extract to Isolate Stigmasterol","authors":"M. Khan, L. M. Bala, M. Maliki","doi":"10.33945/SAMI/AJCA.2019.4.6","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.6","url":null,"abstract":"Phytochemical screening of Terminalia schimperiana (Combretaceae) Root Bark showed presence of flavonoids, tannins, steroid carbohydrates and terpenoides in n-hexane, ethylacetate and methanol as solvents of extraction. Isolated stigmasterol from Terminalia schimperiana was a white-yellow crystal which characterized using 1H-NMR, 13C-NMR, COSY, HSQC and HMBC spectral techniques. Research studies clearly revealed that Terminalia schimperiana root bark extract has potential to be exploited in the pharmaceutical firm in the search for stigmasterol related drug from nature.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73223518","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 : 2019-09-01DOI: 10.33945/SAMI/AJCA.2019.4.8
M. Rashed, A. A. Gad, Nada Magdy Fathy
In this study low cost biochar adsorbent originated from camel bone was prepared by physically treatment, and examine the developed camel bone biochar for the removal of Cd2+ and Pb2+ from their solutions. The biochar adsorbent was characterized before and after development by XRD,SEM, FT-IR, and BET surface The bone sample was pyrolyzed at temperature 500,600, 800, and 900 °C. Adsorption efficiency of Pb and Cd were optimized at different parameters (pH,pH z, contact time , initial metal concentration , adsorbent dosage and temperature. Adsorption kinetic, isotherms, and thermodynamic models have been performed to confirm the adsorption technique.The results revealed that the effective pyrolysis temperature for camel bone was 800oC that suitable for the high removal of Cd and Pb.The maximum adsorption removal percentage for Cd and Pb were 99.4 and 99.89 % , respectively at constant contact time 1 h, 1 g dose, pH 5, and 10 mg/L intial metal concentration. The kinetic results of cadmium and lead adsorption obeyed a pseudo-second-order model and fitted well with the Langmuir isotherm.
{"title":"Adsorption of Cd(II) and Pb(II) Using Physically Pretreated Camel Bone Biochar","authors":"M. Rashed, A. A. Gad, Nada Magdy Fathy","doi":"10.33945/SAMI/AJCA.2019.4.8","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.8","url":null,"abstract":"In this study low cost biochar adsorbent originated from camel bone was prepared by physically treatment, and examine the developed camel bone biochar for the removal of Cd2+ and Pb2+ from their solutions. The biochar adsorbent was characterized before and after development by XRD,SEM, FT-IR, and BET surface The bone sample was pyrolyzed at temperature 500,600, 800, and 900 °C. Adsorption efficiency of Pb and Cd were optimized at different parameters (pH,pH z, contact time , initial metal concentration , adsorbent dosage and temperature. Adsorption kinetic, isotherms, and thermodynamic models have been performed to confirm the adsorption technique.The results revealed that the effective pyrolysis temperature for camel bone was 800oC that suitable for the high removal of Cd and Pb.The maximum adsorption removal percentage for Cd and Pb were 99.4 and 99.89 % , respectively at constant contact time 1 h, 1 g dose, pH 5, and 10 mg/L intial metal concentration. The kinetic results of cadmium and lead adsorption obeyed a pseudo-second-order model and fitted well with the Langmuir isotherm.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"22 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91504250","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 : 2019-07-20DOI: 10.33945/SAMI/AJCA.2019.4.5
Mohammad Jahidul Islam, A. Kumer, Nuruzzaman Sarker, Sunanda Paul, Afroza Zannat
As the morpholine and morphine have been used all over the world as pain killer drugs even used in cancer treatment, so the morpholine is more demanding chemical molecule. In our work, the morpholine has included the addition of inorganic anions like nitrate and nitrite for forming morpholinium based Ionic Liquid. Their chemical properties, biochemical properties, and physio-chemical properties are evaluated using computational chemistry through the Density Functional Theory (DFT). The biological properties have been shown that biological activity in the designed ionic liquid for uses in new drug discovery. From QSAR study, the value of the LogP is 0.713 and 1.7 which indicates hydrophobic nature and PIC50 is -2.14 and -3.96 respectively. The nitrate and nitrite comparison have been highlighted through this work. From QSAR and PIC50, it is seen that due to the nitrate addition with morpholine is more biological activity than nitrite. On the other hand, the toxicity of nitrate is less than nitrite.
{"title":"The prediction and theoretical study for chemical reactivity, thermophysical and biological activity of morpholinium nitrate and nitrite ionic liquid crystals: A DFT study","authors":"Mohammad Jahidul Islam, A. Kumer, Nuruzzaman Sarker, Sunanda Paul, Afroza Zannat","doi":"10.33945/SAMI/AJCA.2019.4.5","DOIUrl":"https://doi.org/10.33945/SAMI/AJCA.2019.4.5","url":null,"abstract":"As the morpholine and morphine have been used all over the world as pain killer drugs even used in cancer treatment, so the morpholine is more demanding chemical molecule. In our work, the morpholine has included the addition of inorganic anions like nitrate and nitrite for forming morpholinium based Ionic Liquid. Their chemical properties, biochemical properties, and physio-chemical properties are evaluated using computational chemistry through the Density Functional Theory (DFT). The biological properties have been shown that biological activity in the designed ionic liquid for uses in new drug discovery. From QSAR study, the value of the LogP is 0.713 and 1.7 which indicates hydrophobic nature and PIC50 is -2.14 and -3.96 respectively. The nitrate and nitrite comparison have been highlighted through this work. From QSAR and PIC50, it is seen that due to the nitrate addition with morpholine is more biological activity than nitrite. On the other hand, the toxicity of nitrate is less than nitrite.","PeriodicalId":7207,"journal":{"name":"Advanced Journal of Chemistry-Section A","volume":"130 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73511045","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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