Modern Chemistry & Applications最新文献_第7页

Using Green's Functions to Understand the Stresses on a Li-air Battery Electrode 用格林函数来理解锂空气电池电极上的应力

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000243

J. Summerfield

引用次数: 0

The Use of Organophilic Bentonite in the Removal Phenol from Aqueous Solution: Effect of Preparation Techniques 亲有机膨润土在去除水溶液中苯酚中的应用:制备工艺的影响

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000258

O. Chidi, Okike U Nnanna, O. Ifedi

{"title":"The Use of Organophilic Bentonite in the Removal Phenol from Aqueous Solution: Effect of Preparation Techniques","authors":"O. Chidi, Okike U Nnanna, O. Ifedi","doi":"10.4172/2329-6798.1000258","DOIUrl":"https://doi.org/10.4172/2329-6798.1000258","url":null,"abstract":"This study focuses on the investigation of the capability of surfactant-modified bentonite for removal of phenol from aqueous solution. Calcium bentonite was beneficiated by means of ion exchange method using sodium trioxocarbonate (IV) resulting into sodium exchanged bentonite (SEB) and modified using ion exchange method, impregnation method, mechanical mixing methods using quaternary hexadecyltrimethylammonium bromide (HDTMABr). Fourier Transform Infra-Red Spectroscopy (FTIR) technique was used to study the vibrational bands of the sodium exchanged bentonite and modified SEB respectively. The effects of contact time, pH and initial concentration were studied on SEB and surfactant-modified SEB. The result reveals that the removal of phenol using SEB and surfactant-modified bentonite has optimum pH, contact time and equilibrium adsorption capacity of 6.0, 60 mins and 22.4 mgg-1 respectively. The result further shows that the surfactant-modified bentonite produced by impregnation method gave better experimental and calculated adsorption capacities of 6.4 mgg-1 and 10.5 mgg-1 respectively. The kinetic data obtained fitted well with pseudo second-order equation with correlation coefficient (R2) value of 0.999. This study therefore recommends that surfactant-modified bentonite obtained by means of impregnation is a potential adsorbent for the removal of phenol from aqueous solution and subsequently waste water.","PeriodicalId":18605,"journal":{"name":"Modern Chemistry & Applications","volume":"51 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81776946","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: 8

UV Spectrophotometric Analysis of Drugs Terbinafine Hydrochloride and Clarithromycin 盐酸特比萘芬和克拉霉素的紫外分光光度分析

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000256

Rao Rm, Sastry Csp

引用次数: 3

Determination of Critical Micelle Concentration and Thermodynamic Evaluations of Micellization of GMS 临界胶束浓度的测定及GMS胶束化的热力学评价

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000251

O. Chidi, I. Adebayo

{"title":"Determination of Critical Micelle Concentration and Thermodynamic Evaluations of Micellization of GMS","authors":"O. Chidi, I. Adebayo","doi":"10.4172/2329-6798.1000251","DOIUrl":"https://doi.org/10.4172/2329-6798.1000251","url":null,"abstract":"The uncontrolled distribution of surfactants which are commonly used as household and industrial products like soaps, lubricants and detergents in the global market have provoked this study. The determination of critical micelle concentration (CMC) of glycerol monostearate surfactant (GMS) was evaluated using Conductivity and UV-Visible Spectroscopic techniques respectively. The effect of solubility was quantified and the Krafft temperature was obtained. The thermodynamic feasibility parameters were evaluated using Erying and Vant Hoff’s equations. The CMC values were taken from the sharp breaks in the plots of absorbance versus surfactant concentrations and conductivity versus surfactant concentration respectively. The result showed that as the temperature increases, the CMC initially decreases and then followed by slight increase owing to the smaller probability of hydrogen bond formation at higher temperatures. The result showed that the critical micelle concentration of GMS obtained using Conductivity and UV-Visible techniques were 4.50 × 10-2 and 2.40 × 10-2 moldm-3 respectively and the Krafft temperature (KT) was obtained at 50°C. The Gibbs free energy change of micellization (ΔG° CMC) was found to decrease as temperature increases over the whole temperature range. The entropy change of micellization (ΔS° (CMC)) showed positive values throughout the temperature range tested while the large enthalpy change, ΔH° (CMC) means that in the micellization process, the attractive interaction among hydrophobic chains was opposed by the strong interaction of the oxyethylene chains of glycerol monostearate with water molecules. The study revealed that the use of UV-Visible Spectroscopy technique was a very good and easy way of determining the critical micelle concentration of GMS. This study is also a valuable industrial tool for the production of soap related products and its applications in domestic and industrial processes.","PeriodicalId":18605,"journal":{"name":"Modern Chemistry & Applications","volume":"1 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89485889","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: 12

Studies on Natural Products: A Facile Epoxidation of Eugenol 天然产物丁香酚易环氧化反应的研究

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000255

R. N. Yadav, B. Banik

引用次数: 3

Isolation, Characterization and Analgesic Activity of Natural Allantoin from Portulaca oleracea Seed 马齿苋种子天然尿囊素的分离、表征及镇痛活性研究

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000249

Hengli Wang, C. Wang

引用次数: 6

Health Risk Assessment Indices and Diseases Suffered by the Dwellers around Asphalt Quarry Sites in Abia State, Nigeria 尼日利亚阿比亚州沥青采石场周边居民健康风险评估指数及疾病

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000264

Charles Io, Martin Io, I. Gn, Obuzor Gu

{"title":"Health Risk Assessment Indices and Diseases Suffered by the Dwellers around Asphalt Quarry Sites in Abia State, Nigeria","authors":"Charles Io, Martin Io, I. Gn, Obuzor Gu","doi":"10.4172/2329-6798.1000264","DOIUrl":"https://doi.org/10.4172/2329-6798.1000264","url":null,"abstract":"This research work is a novel effort towards studying the effect of quarry activities on: concentration of heavy metals in the soil around two quarry sites and leaves of Telfairia occidentalis and Amaranthus spinosus as well as health risk assessment indices and diseases suffered by the dwellers around the quarry sites in Abia State, Nigeria. Geo-accumulation index (Igeo) rating indicated that all topsoil samples analyzed ranged from practically uncontaminated to moderately contaminate for most heavy metals except for nickel which was extremely polluted within 200 m around the quarry sites and arsenic which were strongly polluted within 100 m around the quarry sites. Contamination factor assessment implicated high level of contamination of the soil sample with lead. Other heavy metals studied showed low degree of contamination at points X and Y for the both quarry sites. The concentrations of the various metals also showed a wide range of variation in leaves with variable patterns in the order: Zn>Cu>Pb>Cr>Ni>Cd>As>Hg; Telfairia occidentalis and Zn>Cu>Pb>Cr>Ni>Cd>As>Hg; Amaranthus spinosus leaves. The bioaccumulation factor (BF) of the eight heavy metals in Amaranthus spinosus and Telfairia occidentalis revealed that these vegetables around both sites were poor accumulators of of the heavy metals studied. The daily intake of heavy metals ascribed to the consumption of the vegetables studied indicated low risk for humans as direct consumers. Comparing the health risk assessment parameters with standards from WHO, total agreement could not be obtained as some values beyond the allowable limit of the WHO standards were portrayed as safe level by the health risk assessment parameters.","PeriodicalId":18605,"journal":{"name":"Modern Chemistry & Applications","volume":"1 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76298015","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

Synthesis, Spectral Characterization, Antimicrobial and Theoretical Calculation of Some 4-(tosylamino)benzohydrazide Derivatives 4-苯并酰肼衍生物的合成、光谱表征、抗菌及理论计算

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000252

R. Thangam, Balaji Gl, P. Ramanathan

引用次数: 0

Utilizing Online Technology to Effectively Teach Chemistry in Secondary Education 利用网络技术有效地进行中学化学教学

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000244

Kristen Brown, M. Gilmore, Monica L. Dillihunt, Kendra Minor

引用次数: 5

Catalytic Studies on Schiff Base Complexes of Co(II) and Ni(II) Using Benzoylation of Phenol 苯酚苯甲酰化催化Co(II)和Ni(II)席夫碱配合物的研究

Modern Chemistry & Applications Pub Date : 2018-01-01 DOI: 10.4172/2329-6798.1000260

Melaku Meshesha Tulu, Ali Yimer

{"title":"Catalytic Studies on Schiff Base Complexes of Co(II) and Ni(II) Using Benzoylation of Phenol","authors":"Melaku Meshesha Tulu, Ali Yimer","doi":"10.4172/2329-6798.1000260","DOIUrl":"https://doi.org/10.4172/2329-6798.1000260","url":null,"abstract":"The title metal complexes were found to be crystalline which have been characterized by elemental analysis, electrical conductivity, magnetic susceptibility measurements, and spectral techniques viz, UV-Visible, FT-IR and NMR (1H-NMR and 13C-NMR). These complexes were air-stable, with high melting points and were soluble in methanol and some other organic solvents such as n-hexane, diethylether and DMSO. The molar conductance of 1 × 10-3 M solutions of the metal complexes in methanol at 27°C indicates that they behave as electrolytes. Both Cobalt(II) and Nickel(II) complexes of N-benzylideneaniline ligand show paramagnetic nature. The electronic studies along with magnetic data suggest a square planer geometry for both Co(II) and Ni(II) complexes. The peak in FT-IR spectra at 1627 cm-1 confirmed the υ(C=N) stretching vibration found in the free ligand. This band was shifted to a lower frequency (1603.5 cm-1) in the spectra of the metal complexes and it confirms the participation of azomethine nitrogen in the coordination of metal ions. Finally, the metal complexes were screened for their catalytic activity in the phenol benzoylation reaction and found to be moderately active.","PeriodicalId":18605,"journal":{"name":"Modern Chemistry & Applications","volume":"18 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90663916","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