Malaysian Journal of Analytical Sciences最新文献_第6页

REMOVAL OF Pb(II) FROM AQUEOUS SOLUTION BY PINEAPPLE PLANT STEM 菠萝茎去除水中铅(II)的研究

Malaysian Journal of Analytical Sciences Pub Date : 2019-01-01 DOI: 10.17576/mjas-2019-2302-06

Vivien Ting, T. Ping, A. Abdullah

{"title":"REMOVAL OF Pb(II) FROM AQUEOUS SOLUTION BY PINEAPPLE PLANT STEM","authors":"Vivien Ting, T. Ping, A. Abdullah","doi":"10.17576/mjas-2019-2302-06","DOIUrl":"https://doi.org/10.17576/mjas-2019-2302-06","url":null,"abstract":"The excessive release of lead (Pb) ions into water stream and large production of agricultural wastes cause water and land pollution. Adsorption is useful in eliminating Pb(II) from water environment. The potential use of agricultural waste, pineapple plant stem as adsorbent to reduce the amount of Pb(II) in aqueous solutions was investigated. The material was modified with oxalic acid (OA) to improve the adsorption efficiency of Pb(II). Adsorption isotherms and kinetics were determined for the adsorption of Pb(II) on natural pineapple plant stem (NPPS) and OA modified pineapple plant stem (OAPPS) from aqueous solution in batch studies. The adsorption capacity of Pb(II) on pineapple plant stem depends considerably on the solution pH, in which the amount of Pb(II) adsorbed increased with increasing solution pH, reached its maximal with 14.25 mg/g at pH 5 and 30.47 mg/g at pH 4 for NPPS and OAPPS, respectively. The adsorption performance of the adsorbents was also studied at different initial Pb(II) concentrations (50 – 150 mg/L), it was observed to be less affected at higher initial Pb(II) concentration. The adsorption isotherm was then investigated and the equilibrium data were well fitted with the Langmuir isotherm model with 13.30 and 27.70 mg/g as the calculated maximum capacities for NPPS and OAPPS, respectively. The adsorption of Pb(II) onto NPPS and OAPPS reached equilibrium after 60 minutes at all concentrations studied. The kinetics data were found to follow the pseudo-second order model.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67647483","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

MITIGATION OF TOXIC Alexandrium tamiyavanichii USING CHITOSAN-SILICA COMPOSITE 壳聚糖-二氧化硅复合材料对有毒tamiavanichialexandrium的抑制作用

Malaysian Journal of Analytical Sciences Pub Date : 2019-01-01 DOI: 10.17576/mjas-2019-2301-04

M. Miskam, A. Rahman, Fiona How Ni Foong, Y. Chua, Ping Chen, Zhitao Xiong, Hui-yue Wu

引用次数: 2

PRODUCTION OF ETHYL LEVULINATE VIA ESTERIFICATION REACTION OF LEVULINIC ACID IN THE PRESENCE OF ZrO2 BASED CATALYST 在ZrO2基催化剂存在下，乙酰丙酸酯化反应制备乙酰丙酸乙酯

Malaysian Journal of Analytical Sciences Pub Date : 2019-01-01 DOI: 10.17576/mjas-2019-2301-06

Dorairaaj Sivasubramaniam, N. Amin, K. Ahmad, Nur Aainaa Syahirah Ramli

引用次数: 0

SALICYLATE-BASED PROTIC IONIC LIQUIDS AS A POTENTIAL ANTIOXIDANT 水杨酸基质子离子液体作为潜在的抗氧化剂

Malaysian Journal of Analytical Sciences Pub Date : 2019-01-01 DOI: 10.17576/mjas-2019-2303-02

N. Ahmad, K. Jumbri, A. Ramli, N. Ghani, H. Ahmad

引用次数: 1

THE EFFECTS OF ZEOLITE ON MECHANICAL AND MORPHOLOGICAL PROPERTIES OF NR/ENR MEMBRANES 沸石对nr / enr膜力学性能和形态性能的影响

Malaysian Journal of Analytical Sciences Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-12

Malaysian Journal, Kesan Zeolit, pada Sifat Mekanikal, dan Morfologi, Membran Nrenr, K. Phatcharasit

引用次数: 0

CHITOSAN-BASED ADSORBENTS FOR THE REMOVAL OF METAL IONS FROM AQUEOUS SOLUTIONS 壳聚糖基吸附剂用于去除水溶液中的金属离子

Malaysian Journal of Analytical Sciences Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-11

Zetty Azalea Sutirman, M. M. Sanagi, K. J. A. Karim, A. A. Naim, W. Ibrahim

{"title":"CHITOSAN-BASED ADSORBENTS FOR THE REMOVAL OF METAL IONS FROM AQUEOUS SOLUTIONS","authors":"Zetty Azalea Sutirman, M. M. Sanagi, K. J. A. Karim, A. A. Naim, W. Ibrahim","doi":"10.17576/mjas-2018-2205-11","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-11","url":null,"abstract":"Wastewater containing heavy metal ions is one of the most serious environmental concerns. Exposure to elevated levels of heavy metals can adversely affect water resources, endangering the ecosystems and human health. Among the various treatment technologies, adsorption using biopolymer seems a promising alternative method. Chitosan is a natural polymer produced from chitin with excellent properties such as biocompatibility, biodegradability and non-toxicity. Moreover, chitosan is known as an effective sorbent due to the presence of amino and hydroxyl groups in its molecules which can serve as attachment sites towards metal ions. Recently, chitosan derivatives as metal ion sorbents have gained considerable attention. These derivatives are prepared by either physical or chemical modifications or both in order to improve chitosan properties in adsorption. This paper discusses recent developments in the modifications of chitosan and the application of the derived materials in the removal of metal ions from aqueous solutions. The mechanisms of adsorption, metal sorption capacities, effect of pH, isotherm and kinetic models are also described.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45364808","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

ENHANCEMENT AND OPTIMIZATION OF SINENSETIN EXTRACT FROM Orthosiphon stamineus USING SUPERCRTITICAL CARBON DIOXIDE EXTRACTION 超低温二氧化碳萃取法提高和优化正虹吸管stamineus中SINENSETIN的提取

Malaysian Journal of Analytical Sciences Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-14

Malaysian Journal, A. Aziz, M. Azizi, C. Yunus, Ni Yian, Fahim Rithwan, H. M. Hadzri, A. N. Mustapha

{"title":"ENHANCEMENT AND OPTIMIZATION OF SINENSETIN EXTRACT FROM Orthosiphon stamineus USING SUPERCRTITICAL CARBON DIOXIDE EXTRACTION","authors":"Malaysian Journal, A. Aziz, M. Azizi, C. Yunus, Ni Yian, Fahim Rithwan, H. M. Hadzri, A. N. Mustapha","doi":"10.17576/mjas-2018-2205-14","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-14","url":null,"abstract":"Sinensetin is a rare valuable flavonoid compound that contains 5 methoxy groups attached on the flavone backbone. This compound is abundantly established in citrus peel and can also be found in medicinal herb, ‘misai kucing’. Scientifically, ‘misai kucing’ is known as Orthosiphon stamineus; mostly used to treat kidney stones by old folks. Orthosiphon stamineus was listed in National Key Economic Area (NKEA) as contributor towards the Malaysian Economic Growth. Thus, this study was conducted with objectives to determine suitable modifier for supercritical carbon dioxide (SC-CO2) extraction and to optimize the SC-CO2 extraction condition (pressure, temperature and average particle size) on the concentration of sinensetin. Water, methanol and acetone were used on the determination of modifier for SC-CO2 extraction by using water bath extraction at 40 °C in 8 hours. The results showed that acetone gave the highest percentage of sinensetin extract of 0.11%. Therefore, acetone was used as a modifier to enhance the extraction of sinensetin. The concentration of sinensetin was increased and the highest percentage of sinensetin obtained was 6.99%. Response surface methodology (RSM) through Box-Behnken design via Design Expert Software was applied to optimize the SC-CO2 conditions. The first-order polynomial was used to express the percentage of sinensetin with R value of 0.542. The optimum SC-CO2 operating condition was 30 MPa, 40 °C and 308.24 μm with sinensetin percentage of 4.35%. Hence, SC-CO2 with small amount of modifier was the best method to extract sinensetin as compared to water bath extraction method.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41262755","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

SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF MAGNETITE NANOPARTICLES (Fe3O4) AS POTENTIAL SOLID SUPPORT FOR HOMOGENEOUS CATALYSTS 作为均相催化剂潜在固体载体的磁性纳米颗粒（Fe3O4）的合成及其物理化学性质

Malaysian Journal of Analytical Sciences Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-04

Sintesis dan Sifat Fizikokimia, Nanopartikel Magnetit Fe3O, Sebagai Penyokong, Pepejal Bagi, Mangkin Homogen, Wan Fatihah Khairunisa, W. Nor, S. K. C. Soh, Azzura Abd Rahman Azmi, M. Yusof

{"title":"SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF MAGNETITE NANOPARTICLES (Fe3O4) AS POTENTIAL SOLID SUPPORT FOR HOMOGENEOUS CATALYSTS","authors":"Sintesis dan Sifat Fizikokimia, Nanopartikel Magnetit Fe3O, Sebagai Penyokong, Pepejal Bagi, Mangkin Homogen, Wan Fatihah Khairunisa, W. Nor, S. K. C. Soh, Azzura Abd Rahman Azmi, M. Yusof","doi":"10.17576/mjas-2018-2205-04","DOIUrl":"https://doi.org/10.17576/mjas-2018-2205-04","url":null,"abstract":"Black and dark magnetite nanoparticles (MNPs) were successfully synthesised through a co-precipitation method as a crucial material to support palladium(II) complexes as they have the potential to become a stable solid support for homogeneous systems. The two-hour synthesis was done by mixing FeCl3.6H2O and FeCl2.4H2O in an alkaline medium. To improve the properties of iron oxide nanoparticles, the process was done under inert conditions. The physicochemical properties of this support was then characterised using various spectroscopic techniques such as Fourier Transform Infrared (FTIR) spectroscopy that shows the X-ray diffraction analysis (XRD), Thermogravimetric analysis (TGA), Field Emission Scanning Electron Microscope (FESEM), and Vibrating Sample Magnetometer (VSM). The pore size distribution and the specific BET surface area were measured by N2 adsorption-desorption isotherms. The FTIR absorption spectroscopy was used to confirm the formation of Fe-O bond. The most intense peak correspond to the (311) crystallographic orientation of the spinel cubic phase of MNPs shown by XRD pattern result. The particle size of magnetite was successfully controlled in the range of 20-40 nm. All of the MNPs showed the superparamagnetic behaviour with high saturation magnetization.","PeriodicalId":39007,"journal":{"name":"Malaysian Journal of Analytical Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46692936","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: 20

THERMAL, FLAMMABILITY, AND MORPHOLOGICAL PROPERTIES OF SEPIOLITE-FILLED ETHYLENE PROPYLENE DIENE MONOMER COMPOSITES 海泡石填充乙烯-丙烯-二烯单体复合材料的热性能、燃烧性能和形态性能

Malaysian Journal of Analytical Sciences Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-18

Malaysian Journal, Terisi Sepiolit, N. M. Zaini

引用次数: 0

SYNTHESIS OF 2-AMINOBIARYL DERIVATIVES PROMOTED BY WATER EXTRACT OF ONION PEEL ASH 洋葱皮灰水提物促进2-氨基生物基衍生物的合成

Malaysian Journal of Analytical Sciences Pub Date : 2018-10-25 DOI: 10.17576/mjas-2018-2205-01

Malaysian Journal, P. W. Chia, P. Chee, Siti Nur Aqlili, Riana Mohd Asseri, Su-Yin Kan

引用次数: 7