chemistry and materials research最新文献_第2页

Mechanical Properties and Application of Graphite and Graphite-based Nanocomposite : A Review 石墨及石墨基纳米复合材料的力学性能及应用综述

chemistry and materials research Pub Date : 2023-04-01 DOI: 10.7176/cmr/15-1-02

引用次数: 0

Extraction of Cobalt and Cadmium in Municipal Dump Sites around Zaria, Kaduna State Using EDTA and Citrate as Complexing Agents 用EDTA和柠檬酸盐络合萃取卡杜纳州扎里亚市垃圾场中的钴和镉

chemistry and materials research Pub Date : 2023-04-01 DOI: 10.7176/cmr/15-1-01

引用次数: 0

A Quantitative Estimation of Phytochemical, Anti-Diabetic and Anti-Oxidant Activity of Crude Extract of Root of Jurinea Dolomiaea Boiss 朱麻根粗提物的植物化学、抗糖尿病和抗氧化活性的定量评价

chemistry and materials research Pub Date : 2023-04-01 DOI: 10.7176/cmr/15-1-04

引用次数: 0

Determination of Essential Minerals in Manures of Selected Domestic Animals in Karatina and Their Effects on Soil and Plants 卡拉蒂纳部分家畜粪便中必需矿物质的测定及其对土壤和植物的影响

chemistry and materials research Pub Date : 2023-04-01 DOI: 10.7176/cmr/15-1-03

引用次数: 0

Analysis of Nickel(II) in Water Medium using Electrochemical Techniques 电化学技术分析水介质中镍(II)

chemistry and materials research Pub Date : 2023-02-28 DOI: 10.56425/cma.v2i1.49

Gayatri Citra Dewi, Odetta Levin

引用次数: 0

Synthesis of Nanoscale Zero-Valent Iron with Polyphenol Extract from Cloves (Syzygium aromaticum) Through a Stepwise Reaction and Adsorption Test on Pb(II) 丁香多酚萃取物分步反应合成纳米级零价铁及其对Pb(II)的吸附试验

chemistry and materials research Pub Date : 2023-02-27 DOI: 10.56425/cma.v2i1.48

Yuliana Dewi Anugrah, Annissa Amalia, Salma Fitri Annisa

引用次数: 0

Phyllantin Extraction Using Imidazolium Ionic Liquids with Chloride and Bromide Anion by Microwaved Assisted Extraction Method 氯、溴离子咪唑类离子液体微波辅助萃取法提取甘油三丁

chemistry and materials research Pub Date : 2023-02-27 DOI: 10.56425/cma.v2i1.47

B. A. Suliasih, Surya Geraldi, Hana Yunita Hidayat, Eko Abdul Mun’im, Aditya Rifai

{"title":"Phyllantin Extraction Using Imidazolium Ionic Liquids with Chloride and Bromide Anion by Microwaved Assisted Extraction Method","authors":"B. A. Suliasih, Surya Geraldi, Hana Yunita Hidayat, Eko Abdul Mun’im, Aditya Rifai","doi":"10.56425/cma.v2i1.47","DOIUrl":"https://doi.org/10.56425/cma.v2i1.47","url":null,"abstract":"Phyllanthin is known to have therapeutic properties such as immunomodulator, nephroprotective, and anticancer. Phyllanthin is a lignan compound that is commonly found in plants of the Phyllanthus genus, one of which is green meniran (Phyllanthus niruri). Solvent Ionic Liquid (IL) is one of the alternative solvents that are widely used for the extraction of compounds from a plant. The purpose of this study were to compare the extraction yield of philanthine compounds from meniran herbs using IL solvent by Microwave Assisted Extraction (MAE) with methanol by maceration method, and to determine the IL solvent that could produce the highest phyllanthin content. Optimization were carried out using the independent variables IL solvent concentration (0.25 M, 0.75 M, and 1.25 M) and sample-solvent mixture (1:10, 1:12, and 1:14). The variable modeling is designed using Response Surface Methodology that produced 9 runs of combination of solvent concentration and sample-solvent mixture ratio. The phyllanthin assay was using High Performance Liquid Chromatography (HPLC) with ethanol-water mixture (66:34) as mobile phase and wavelength at 229 nm for detection. The optimum extraction conditions showed the best results for imidazolium chloride IL at 1st run with a concentration of 0.75 M, the sample-solvent mixture of 1:14 and phyllanthin content of 0.1783 mg/g while imidazolium bromide IL at 7th run with a concentration of 0.75 M and the sample-solvent mixture of 1:12 and phyllanthin content of 0.23 mg/g. However, the methanol maceration method could only extract phyllanthin as much as 0.1319 mg/g. Based on these results, the use of IL-MAE was more effective than the methanol maceration method due to higher phyllantin extract.","PeriodicalId":9724,"journal":{"name":"chemistry and materials research","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90876533","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: 0

Electrodeposition of CoxNiy Thin Film and Its Catalytic Activity for Ethanol Electrooxidation CoxNiy薄膜的电沉积及其对乙醇电氧化的催化活性

chemistry and materials research Pub Date : 2023-02-27 DOI: 10.56425/cma.v2i1.50

Hilman Syafei, Dwi Giwang Kurniawan

{"title":"Electrodeposition of CoxNiy Thin Film and Its Catalytic Activity for Ethanol Electrooxidation","authors":"Hilman Syafei, Dwi Giwang Kurniawan","doi":"10.56425/cma.v2i1.50","DOIUrl":"https://doi.org/10.56425/cma.v2i1.50","url":null,"abstract":"Platinum is often used as a catalyst in ethanol electrooxidation. Still, it has many disadvantages being expensive and its active site can be poisoned by CO. Transition metal of Co and Ni can become a catalyst in alcohol electrooxidation at a lower cost to synthesize. In this work, bimetallic CoNi were successfully prepared by electrodeposition method with different Co/Ni ratios to enhance ethanol electrooxidation. Samples of CoNi are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and electrochemical impedance spectroscopy (EIS). XRD diffractogram confirmed the formation of CoNi. Morphology of CoNi in SEM characterization showed that CoNi with ratio 5:1 has the more dispersed particle and the greatest surface area. EDX characterization indicated that the relative weight of different Co/Ni ratios, the composition wt.% Co is 81.15% and wt.% Ni is 18.85% in CoNi 5:1, wt.% Co is 60.96% and wt.% Ni is 30.94% in CoNi 2:5, while wt.% Co is 50.19%, and wt.% Ni is 49.81% in CoNi 5:5. EIS characterization showed that CoNi with ratio of 5:1 has faster electron kinetics. Electrooxidation of ethanol used cyclic voltammetry (CV) method. The best results from the ethanol electrooxidation reaction were obtained for CoNi with a ratio of 5:1 because of the greatest surface area that showed in scanning electron microscopy and fast electron transfer kinetics compared to others ratio of CoxNiy.","PeriodicalId":9724,"journal":{"name":"chemistry and materials research","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78615402","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

Electrodeposition of CoNi Cocatalyst to Enhance Ethanol Electrooxidation of Zn-doped Cu2O-Cu Photocatalyst 电沉积CoNi助催化剂增强zn掺杂cu20 - cu光催化剂乙醇电氧化性能

chemistry and materials research Pub Date : 2023-02-27 DOI: 10.56425/cma.v2i1.44

Alfian Putra Utama, Afrizal

{"title":"Electrodeposition of CoNi Cocatalyst to Enhance Ethanol Electrooxidation of Zn-doped Cu2O-Cu Photocatalyst","authors":"Alfian Putra Utama, Afrizal","doi":"10.56425/cma.v2i1.44","DOIUrl":"https://doi.org/10.56425/cma.v2i1.44","url":null,"abstract":"In this research, the electrooxidation of ethanol was catalyzed using Zn-doped Cu2O-Cu/CoNi heterostructure syntesized using an electrodeposition method. Potential deposition of CoNi cocatalyst was varied to obtain the highest photoelectrochemical performance and photocatalytic activity of Zn-doped Cu2O-Cu/CoNi. The photoelectrochemical properties and photocatalytic activity investigated by electrochemical impedance spectroscopy, linear sweep voltammetry, and cyclic voltammetry. The increase of deposition potential from -1.3 V to -1.75 V increased the ethanol oxidation reaction. Zn-doped Cu2O-Cu/CoNi -1.75 V electrode showed superior photocatalytic activity for the ethanol electrooxidation compared to other electrodes. This photocatalyst showed a high photocurrent density of 22.47 mA/cm2. Moreover, cyclic voltammetry tests up to 100 cycles indicated that CoNi deposition potential at -2 V increased the long-term stability of the photocatalyst against the poisoning species than other electrodes. The fraction of CoNi enhanced CO tolerance and contributed to the higher specific activity towards ethanol electrooxidation. An excess number of CoNi at -2 V was found to decrease photocatalytic activity but increase the photostability of the material.","PeriodicalId":9724,"journal":{"name":"chemistry and materials research","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82717354","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: 0

The Effect of Deposition Potential on the Electrodeposition of Platinum Nanoparticles for Ethanol Electrooxidation 沉积电位对乙醇电氧化铂纳米颗粒电沉积的影响

chemistry and materials research Pub Date : 2022-11-15 DOI: 10.56425/cma.v1i3.46

Amelia Sabella, Reyhan Syifa, Nandita Annisa Dwiyana

引用次数: 3