Cogent Chemistry最新文献_第8页

An investigation on the synthesis and catalytic activities of pure and Cu-doped zinc oxide nanoparticles 纯氧化锌纳米粒子和掺杂氧化锌纳米粒子的合成及其催化活性研究

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1301241

Amen Shahpal, Muhammad Aziz Choudhary, Z. Ahmad

{"title":"An investigation on the synthesis and catalytic activities of pure and Cu-doped zinc oxide nanoparticles","authors":"Amen Shahpal, Muhammad Aziz Choudhary, Z. Ahmad","doi":"10.1080/23312009.2017.1301241","DOIUrl":"https://doi.org/10.1080/23312009.2017.1301241","url":null,"abstract":"Abstract The typical polyol reduction method, where PVP was used as capping agent is aimed to synthesize pure and Cu-doped ZnO nanoparticles (NPs). The spherical morphology of as-synthesized NPs was observed under SEM. The NPs having Zn, O, and Cu as major constituents were observed by SEM coupled with EDX. The EDX confirmed the Zn, O, and Cu as major elements of as-synthesized NPs. The X-ray diffraction (XRD) studies demonstrated crystalline hexagonal structure in all the samples. The band gap of the NPs was determined using UV–vis spectroscopy. The catalytic activities of as-prepared material were investigated for the degradation of dyes like; Methyl Blue (MB), Methyl Red (MR), Thymol Blue (TB), and Alizarine Red.S (ARS), in the presence of H2O2. A drastic increase in catalytic activity was observed with the increased concentration of Cu; particularly for MB. All experiments were carried out under mild and environment friendly conditions i.e. without irradiating by sun or UV light. The material was found promising and feasible catalyst for non-photo degradation of dyes, which are present in the wastewaters produced from textile and printing industries.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2017.1301241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46429304","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}

引用次数: 19

Evaluation of in vitro antibacterial activity of Caralluma lasiantha for scientific validation of Indian traditional medicine 体外抗菌活性评价对印度传统药物的科学验证

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1374821

S. Malladi, V. N. Ratnakaram, K. Suresh Babu, T. Pullaiah, Bhambra Avninder

引用次数: 8

Mechanism sorption of carbon dioxide onto dam silt 大坝淤泥对二氧化碳的吸附机理

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1300974

Fatima Ouadjenia, R. Marouf, J. Schott

{"title":"Mechanism sorption of carbon dioxide onto dam silt","authors":"Fatima Ouadjenia, R. Marouf, J. Schott","doi":"10.1080/23312009.2017.1300974","DOIUrl":"https://doi.org/10.1080/23312009.2017.1300974","url":null,"abstract":"Abstract In this paper, a study of the adsorption of carbon dioxide onto raw Chorfa silt material (Mascara, Algeria) was experimentally investigated using volumetric technique at 295 K and at a pressure range from 15.59 to 750 mm Hg. XRD, MEB, and BET analysis were used to characterize the adsorbent. This material consisted of calcite and illite as main components. Several models were used to describe the experimental isotherm such as Langmuir, Freundlich, Hill De Boer, and Sips. The best fit of adsorption isotherm data is obtained with the Sips model. The proposed methodology for the analysis of the experimental adsorption data allows the determination of the micropore volume (V0) and the characteristic energy (E) using Dubinin–Raduskevich equation. An experimental value of V0 equal to 0.875 cm3/g is obtained in very good agreement with those found using the “t-plot” method, it is equal to 0.920 cm3/g. The characteristic energy E is equal to 20.9 kJ/mol, this value indicates that the adsorption is of physical type. The unipore diffusion model was selected for sorption kinetic modeling. The diffusion process of CO2 in the silt is slow. A thermodynamic study showed spontaneous nature and feasibility of the adsorption process.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2017.1300974","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48051500","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}

引用次数: 4

Synthesis of new anti-bacterial agents: Hydrazide Schiff bases of vanadium acetylacetonate complexes 新型抗菌药物的合成:乙酰丙酮钒配合物的肼希夫碱

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1336864

C. W. Dikio, B. Okoli, F. Mtunzi

{"title":"Synthesis of new anti-bacterial agents: Hydrazide Schiff bases of vanadium acetylacetonate complexes","authors":"C. W. Dikio, B. Okoli, F. Mtunzi","doi":"10.1080/23312009.2017.1336864","DOIUrl":"https://doi.org/10.1080/23312009.2017.1336864","url":null,"abstract":"Abstract Four Schiff bases, L1, L2, L3 and L4 having –ON– donor system have been synthesised by the condensation of 4-(diethylamino)-2-hydroxybenzaldehyde with 4-nitrobenzohydrazide and 4-methoxybenzohydrazide to form L1 and L2. 4-(dimethylamino) benzaldehyde refluxed in the presence of 4-nitrobenzohydrazide and 4-methoxybenzohydrazide forms L3 and L4, respectively. The four Schiff base complexes (SBC 1A–1D) were synthesised by treatment of the Schiff base ligands with vanadium acetylacetonate and characterised using spectroscopic analysis such as FTIR revealing the presence of azomethine μ (C=N) stretching vibrations around 1612–1623 cm−1, 1H and 13C NMR revealing the presence of azomethine peaks to confirm the formation of the Schiff base ligands. The spectral data of the Schiff base complexes reveal the absence of the azomethine stretching vibrational frequencies and the presence of the V–O stretching vibrational frequency at 993 cm−1. Thermal analysis of the ligands and complexes indicates high thermal stability of 280 and 160°C, respectively. Schiff base complexes 1A and 1B exhibited antimicrobial activities against both species tested with MIC of 305.3 and 378.9 mg/mL, these activities were dependent on the position of the hydroxyl and the length of the alkyl groups on the 4-Methoxy-benzoic acid (4-diethylamino-2-hydroxy-benzylidene)-hydrazide moiety of the Schiff bases complex.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2017.1336864","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46753284","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}

引用次数: 18

Ultra performance liquid chromatographic method for simultaneous quantification of plerixafor and related substances in an injection formulation 超高效液相色谱法同时定量注射制剂中多立沙及相关物质

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2016.1275955

G. Venkata Narasimha Rao, B. Ravi, M. Sunil Kumar, P. Manoj, R. Venkata Nadh

引用次数: 2

Determination of heavy metal concentration in soils used for cultivation of Allium sativum L. (garlic) in East Gojjam Zone, Amhara Region, Ethiopia 埃塞俄比亚阿姆哈拉地区东Gojjam区大蒜种植土壤重金属浓度测定

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1419422

W. Addis, Alemayehu Abebaw

{"title":"Determination of heavy metal concentration in soils used for cultivation of Allium sativum L. (garlic) in East Gojjam Zone, Amhara Region, Ethiopia","authors":"W. Addis, Alemayehu Abebaw","doi":"10.1080/23312009.2017.1419422","DOIUrl":"https://doi.org/10.1080/23312009.2017.1419422","url":null,"abstract":"Abstract Garlic is the most widely used bulb crop next to onion in Ethiopia. It has been used in many local peoples of Ethiopia as a flavoring agent in food and medicinal value for different diseases. The concentrations of eight heavy metals (Fe, Zn, Mn, Cu, Co, Ni, Cd, and Pb) in soil samples used for cultivation of garlic in East Gojjam Zone (Debre Markos, Dejen, Bichena, and Debre Werk) in Ethiopia were determined. The results obtained revealed that the mean heavy metal concentrations for Fe, Zn, Mn, Cu, Co, Ni, Cd, and Pb were 23,866–32,262 mg/kg, 137.1–213.4 mg/kg, 401.8–583.7 mg/kg, 52.1–77.3 mg/kg, 106.6–177.6 mg/kg, 87.5–123.5 mg/kg, 2.3–2.5 mg/kg, and 13.8–23.2 mg/kg, respectively. In general, the levels of metals in soil collected from all the sampling sites was found to decreased in the order of: Fe > Mn > Zn > Co > Ni > Cu > Pb > Cd. In general, the results reveal that the level of contamination of the soils by the heavy metals is not high at present and the soil is not polluted by toxic heavy metals (Cd and Pb). Therefore, the soils studied were not harmful for cultivation of garlic and other agricultural purposes.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2017.1419422","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48944131","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}

引用次数: 77

Degradation and mineralization of moxifloxacin antibiotic in aqueous medium by electro-Fenton process: Kinetic assessment and oxidation products 电-芬顿法在水介质中降解和矿化莫西沙星抗生素：动力学评价和氧化产物

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1290021

M. S. Yahya, Nisrine Beqqal, Guessous Aicha, Mohamed Réda Arhoutane, K. Kacemi

引用次数: 11

Another application of newly prepared Brønsted-acidic ionic liquids as highly efficient reusable catalysts for neat synthesis of amidoalkyl naphthols 新制备的Brønsted酸性离子液体作为高效可重复使用的催化剂在酰胺基烷基萘酚纯合成中的另一应用

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1312675

Maryam Dehghan, A. Davoodnia, M. Bozorgmehr, N. Tavakoli-Hoseini

引用次数: 2

Relative bactericidal efficacies of a selection of alcohol-based hand sanitizers (ABHS) available in Ghana 加纳可用的几种酒精基洗手液(ABHS)的相对杀菌效果

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1317317

J. Mensah, Gideon Dela Akorsu, Charles Anamoah

{"title":"Relative bactericidal efficacies of a selection of alcohol-based hand sanitizers (ABHS) available in Ghana","authors":"J. Mensah, Gideon Dela Akorsu, Charles Anamoah","doi":"10.1080/23312009.2017.1317317","DOIUrl":"https://doi.org/10.1080/23312009.2017.1317317","url":null,"abstract":"Abstract The liberal use of alcohol-based hand sanitizers (ABHS) for hand disinfection has raised questions regarding the bactericidal efficacies of brands that are widely available in Ghana. Ten different brands of hand sanitizers bearing different chemical constituents and originating from six different countries were purchased in Kumasi, Ghana. The 10 samples represent the only available brands in the retail market. Purchased brands were examined for their relative bactericidal efficacies with the combined use of agar well diffusion, broth dilution, and viable bacterial count reduction assays. Serially diluted solutions of the ABHS displayed variable brand-specific bactericidal efficacies against a panel of bacteria specimen that comprised three gram-positive bacteria (Staphylococcus aureus, Enterococcus faecalis, Streptococcus pneumonia) and three gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, Salmonella typhi) in the agar well diffusion and in the broth dilution assays. Neither gram-positive nor gram-negative bacteria strains showed a clear pattern of preferential susceptibility to the growth inhibitory activities of any of the examined brands of ABHS. Only HS9 displayed a full spectrum bactericidal activity against all bacteria species in agar diffusion assay. Full strength ABHS formulations demonstrated brand-based rapid bactericidal action on hands of volunteers in a pattern best described as a post-ABHS-treatment reduction in levels of viable bacteria hand counts. HS9 displayed the highest efficacy and this relative estimation held true in all the three assays utilized for the assessment of bactericidal efficacies.","PeriodicalId":10640,"journal":{"name":"Cogent Chemistry","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/23312009.2017.1317317","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43638336","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}

引用次数: 1

Silver rubber-hydrogel nanocomposite as pH-sensitive prepared by gamma radiation: Part I γ辐射制备pH敏感的银-橡胶水凝胶纳米复合材料：第一部分

Cogent Chemistry Pub Date : 2017-01-01 DOI: 10.1080/23312009.2017.1328770

Mohamed Mohamady Ghobashy, A. Awad, M. Elhady, A. Elbarbary

引用次数: 10