Green and Sustainable Chemistry最新文献_第4页

Emulsion Graft Polymerization of Methyl Methacrylate onto Cellulose Nanofibers 甲基丙烯酸甲酯在纤维素纳米纤维上的乳液接枝聚合

Green and Sustainable Chemistry Pub Date : 2021-02-02 DOI: 10.4236/GSC.2021.111002

H. Okada, Chao Zhao, Y. Mizuta, K. Yoshino, R. Sugimoto

引用次数: 1

Green Synthesis of Silver Nanoparticles Using Cannabis sativa Extracts and Their Anti-Bacterial Activity 大麻提取物绿色合成纳米银及其抗菌活性研究

Green and Sustainable Chemistry Pub Date : 2021-02-02 DOI: 10.4236/GSC.2021.111004

S. Mandal, S. Marpu, R. Hughes, M. Omary, S. Shi

{"title":"Green Synthesis of Silver Nanoparticles Using Cannabis sativa Extracts and Their Anti-Bacterial Activity","authors":"S. Mandal, S. Marpu, R. Hughes, M. Omary, S. Shi","doi":"10.4236/GSC.2021.111004","DOIUrl":"https://doi.org/10.4236/GSC.2021.111004","url":null,"abstract":"A procedure for the green synthesis of silver nanoparticles (AgNPs) using Cannabis sativa (hemp plant) as a stabilizing \u0000media was developed and antibacterial activity was tested. Within 30 minutes of \u0000heating the mixture \u0000of silver nitrate and hemp extract, the formation of silver nanoparticles took place \u0000under the complete absence of a chemical reducing or an additional stabilizing agent. \u0000The so-formed AgNPs were characterized using different optical spectroscopy and \u0000electron microscopy techniques. The initial formation of AgNPs was established from \u0000UV-Vis data based on surface plasmon resonance (SPR) of AgNPs at ~417 nm. The exact size, shape, and elemental composition of \u0000AgNPs were established from ESEM images and EDS data. The antibacterial activity of these nanoparticles was \u0000studied on Gram-positive Staphylococcus aureus, \u0000and Gram-negative Escherichia coli following Disk diffusion and Minimum Inhibitory Concentration (MIC) tests. \u0000Results showed that the biosynthesis of silver nanoparticles using hemp extract could be a simple,inexpensive, \u0000and biocompatible method.","PeriodicalId":12770,"journal":{"name":"Green and Sustainable Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81620969","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: 13

Effect of Microwave Irradiation on Oximation of Acetylferrocene 微波辐照对乙酰二茂铁氧化的影响

Green and Sustainable Chemistry Pub Date : 2021-02-02 DOI: 10.4236/GSC.2021.111001

Y. Okada, Ryuichi Maeda

引用次数: 1

Optimization of Jatropha Biodiesel Production by Response Surface Methodology 响应面法优化麻疯树生物柴油生产工艺

Green and Sustainable Chemistry Pub Date : 2021-02-02 DOI: 10.4236/GSC.2021.111003

Nurudeen Ishola Mohammed, N. Kabbashi, Z. Alam, M. Mirghani

{"title":"Optimization of Jatropha Biodiesel Production by Response Surface Methodology","authors":"Nurudeen Ishola Mohammed, N. Kabbashi, Z. Alam, M. Mirghani","doi":"10.4236/GSC.2021.111003","DOIUrl":"https://doi.org/10.4236/GSC.2021.111003","url":null,"abstract":"Cost of biodiesel is primarily because of factors such \u0000as the feedstock, production process and materials. Apparently, the final biodiesel \u0000product is a bit expensive compared to fossil diesel fuel. While non-food feedstock \u0000of high oil content such as Jatropha curcas has been proposed to reduce \u0000the cost due to the feedstock, a promising two-step approach of hydro-esterification \u0000can possibly offset the production cost for oil resource with high free fatty acids. \u0000Most importantly, optimization of the materials and process is expected to reduce \u0000wastage, enhance product purity and generate less wastewater. However, optimizing \u0000product generation has been dauntingly elusive because several parameters are needed \u0000to be considered holistically. In this study, Response Surface Methodology (RSM) \u0000was employed to optimize the yield and conversion of Jatropha biodiesel from J. curcas hydrolysate. \u0000An optimum Yield and conversion of 96% was achieved for both responses with an optimum \u0000temperature value of 60°C, 4 wt% for catalyst loading for 6 hrs reaction \u0000time. Findings imply that optimization study of Jatropha curcas hydrolysate \u0000for yield and conversion of fatty acid methyl esters using face centered central \u0000composite design of Design Expert 6.0.8 can ensure purity of product, conserve energy \u0000and reduce waste generation providing a significant frontier in biodiesel pricing.","PeriodicalId":12770,"journal":{"name":"Green and Sustainable Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86801990","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: 7

Application of nanosized zeolites in methanol conversion processes: A short review 纳米沸石在甲醇转化过程中的应用综述

Green and Sustainable Chemistry Pub Date : 2021-02-01 DOI: 10.1016/j.cogsc.2020.100393

Ana Palčić, E. Catizzone

引用次数: 16

Temporal and Oscillatory Behavior Observed during Methanol Synthesis on a Cu/ZnO/Al₂O₃ (60:30:10) Catalyst Cu/ZnO/Al2O3催化剂合成甲醇的时间和振荡行为观察

Green and Sustainable Chemistry Pub Date : 2021-01-01 DOI: 10.4236/gsc.2021.113007

M. A. Aldosari

引用次数: 0

The Effects of Oxidation States and Spin States of Chromium Interaction with Sargassum Sp.: A Spectroscopic and Density Functional Theoretical Study 铬与马尾藻相互作用的氧化态和自旋态影响:光谱和密度泛函理论研究

Green and Sustainable Chemistry Pub Date : 2021-01-01 DOI: 10.4236/gsc.2021.114011

M. A. Matin, Md. Aftab Ali Shaikh, Md. Anwar Hossain, M. Alauddin, T. Debnath, M. Aziz

{"title":"The Effects of Oxidation States and Spin States of Chromium Interaction with Sargassum Sp.: A Spectroscopic and Density Functional Theoretical Study","authors":"M. A. Matin, Md. Aftab Ali Shaikh, Md. Anwar Hossain, M. Alauddin, T. Debnath, M. Aziz","doi":"10.4236/gsc.2021.114011","DOIUrl":"https://doi.org/10.4236/gsc.2021.114011","url":null,"abstract":"The study of various oxidation states of chromium with Sargassum sp. is of particular interest since hexavalent chromium is reduced to trivalent chromium in an aqueous solution. In this study, a systematic density functional theory (DFT) calculations were performed to study the interactions of transition metal chromium ion with different oxidation states and spin states with the Sargassum sp. decorated with carboxylate (acetate) at the wB97XD/6-311++ G(d,p) level of theory. The structures and binding energies of chromium met-al-carboxylate complexes at various oxidation states and spin states in gas phase were examined. The coordination strength of Cr(VI) with the acetate ligand was predominantly the strongest compared to the other oxidation states. Vibrational frequency analysis, for the homoleptic monomers of tris [Cr III (AC) 3 ] 0 and [Cr VI (AC) 3 ] 3+ complexes, illustrate good harmony with the experimental and theoretical calculated frequencies. Using the time-dependent DFT (TD-DFT) at the level of CAM-B3LYP/6-311++G(d,p), the vertical excitation energies were obtained. The stabilization energies derived using the second order perturbation","PeriodicalId":12770,"journal":{"name":"Green and Sustainable Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74856965","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: 2

Essential Oil from Ether-Containing Plants of Juniper (Juniperus) and Spruce (Picea) Leaves by Distillation 用蒸馏法从含醚植物杜松(Juniperus)和云杉(Picea)叶子中提取精油

Green and Sustainable Chemistry Pub Date : 2020-10-21 DOI: 10.4236/gsc.2020.104008

B. Abylaeva, T. Abdulazizov, Zamira Sandybaeva, Z. Abdullaeva, Ernis Bepiev, Z. Akhmedova

引用次数: 1

Green Synthesis of Magnetite Nanoparticles Using Aqueous Leaves Extracts of Azadirachta indica and Its Application for the Removal of As(V) from Water 印楝叶水提物绿色合成纳米磁铁矿及其去除水中砷(V)的研究

Green and Sustainable Chemistry Pub Date : 2020-10-21 DOI: 10.4236/gsc.2020.104009

K. Parajuli, A. K. Sah, H. Paudyal

{"title":"Green Synthesis of Magnetite Nanoparticles Using Aqueous Leaves Extracts of Azadirachta indica and Its Application for the Removal of As(V) from Water","authors":"K. Parajuli, A. K. Sah, H. Paudyal","doi":"10.4236/gsc.2020.104009","DOIUrl":"https://doi.org/10.4236/gsc.2020.104009","url":null,"abstract":"Because of various disadvantages of chemical synthesis processes, these days people are attracting towards green synthesis processes as it is devoid of toxic by-products, cost-effective and eco-friendly. In this study, a simple green synthesis method is applied for the synthesis of magnetite (Fe3O4) nanoparticles (MNPs) by co-precipitation of FeCl3·6H2O and FeSO4·7H2O in the molar ratio of 2:1 using Azadirachta indica leaves extract under nitrogen environment. FTIR, XRD, SEM etc. were used to characterize the synthesized MNPs. Batch adsorption experiments were carried out to determine adsorption equilibrium of As(V) as a function of pH, adsorbent dose, contact time and different initial concentrations. Kinetics results were best described by pseudo-second order model with rate constant value 0.0052 g/(mg·min). The equilibrium adsorption isotherm was best fitted with Langmuir adsorption isotherm model. The maximum adsorption capacity was found to be 62.89 mg/g at pH 2. MNPs showed a high affinity for As(V) and avoids filtration for solid-liquid separation, thus it would be employed as a promising material for the removal of As(V) from water.","PeriodicalId":12770,"journal":{"name":"Green and Sustainable Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83841687","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: 13

Removal of Chromium (VI) from Tannery Effluent Using Bio-Char of Phoenix reclinata Seeds 利用凤尾草种子生物炭去除制革废水中的六价铬

Green and Sustainable Chemistry Pub Date : 2020-08-19 DOI: 10.4236/gsc.2020.103007

Joseph Katenta, C. K. Nakiguli, P. Mukasa, E. Ntambi

{"title":"Removal of Chromium (VI) from Tannery Effluent Using Bio-Char of Phoenix reclinata Seeds","authors":"Joseph Katenta, C. K. Nakiguli, P. Mukasa, E. Ntambi","doi":"10.4236/gsc.2020.103007","DOIUrl":"https://doi.org/10.4236/gsc.2020.103007","url":null,"abstract":"The potential of the Senegal date palm (Phoenix reclinata) seed bio-char to remove chromium (VI) ions from aqueous solutions by \u0000adsorption was investigated. Adsorption experiments were performed on the \u0000tannery effluent and standard aqueous solutions of chromium (VI) for varying \u0000adsorbent doses, contact times, pH, temperatures, and interfering anionic ions \u0000by batch mode. Phoenix reclinata seeds (PRS) bio-char was used in the investigation and the residual \u0000chromium (VI) was determined using the atomic absorption spectrophotometer \u0000(AAS). Results showed that the bio-char removed up to 86% of chromium (VI) ions \u0000in the effluent at pH 2. The highest percentage adsorption registered was 97% \u0000in an aqueous solution of chromium (VI) at pH 1 and this dropped to less than \u000010% at pH greater than 2. A general increase in adsorption with the increase in temperature was \u0000observed but reduced when the temperature was raised beyond 60°C. The presence of interfering anions caused a reduction in the \u0000adsorption of chromium (VI) ions. The adsorption process fitted both Langmuir \u0000and Freundlich adsorption models and the maximum adsorption capacity, Qo, was 0.6593 mg/g. Thus, PRS bio-char can therefore be used by industries and institutions like secondary schools to treat \u0000effluents that contain chromium (VI).","PeriodicalId":12770,"journal":{"name":"Green and Sustainable Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76756487","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: 3