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The Uptake of Copper(II) Ions by Chelating Schiff Base Derived from 4-Aminoantipyrine and 2-Methoxybenzaldehyde

International Journal of Nonferrous Metallurgy 2013年第1期2卷 1-9页

作者： Chuan-Wei Oo Hasnah Osman Sharon Fatinathan maizatul akmar md. zin School of Chemical Sciences Universiti Sains Malaysia Penang Malaysia

The Schiff base, 4-[(2-methoxybenzylidene)amino]-1,5-dimethyl-2-phenyl-1H-pyrizol-3(2H)-one (SB), was used for the first time to adsorb copper(II) ions in aqueous solution. Various parameters such as initial pH, agitation period and different initial concentration of copper(II) ions which influenced the adsorption capacity were investigated. The equilibrium adsorption data for copper(II) ions were fitted to Langmuir, Freundlich and Dubinin-Radushkevish isotherm models. The maximum monolayer adsorption capacity of SB as obtained from Langmuir isotherm was 5.64 mg/g. Kinetic data correlated well with the pseudo second-order kinetic model indicating that chemical adsorption was the rate limiting step.

关键词： Schiff Base Adsorption Copper(II) Ions Isotherm Kinetics

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Rheological and physicochemical characteristics of asphalt mastics incorporating lime kiln dust and dolomite powder as sustainable fillers

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Journal of Road Engineering 2023年第1期3卷 98-112页

作者： Najib Mukhtar Mohd Rosli Mohd Hasan Hanizah Osman Zainiah Mohd zin Khairul Anuar Shariff Nur Izzi md.Yusoff Ashiru Sani School of Civil Engineering Universiti Sains Malaysia(Engineering Campus)Nibong Tebal 14300PenangMalaysia Department of Civil Engineering Bayero University KanoKabuga 700241 KanoNigeria School of Materials and Mineral Resources Engineering Universiti Sains Malaysia(Engineering Campus)Nibong Tebal 14300PenangMalaysia Department of Civil Engineering Faculty of Engineering&Built EnvironmentUniversiti Kebangsaan MalaysiaSelangor Darul Ehsan 43600Malaysia Department of Civil Engineering Kano University of Science and TechnologyKano 3244Nigeria

The filler-bitumen interaction mechanism is one of the most essential phases for comprehending the asphalt mixture's ***,despite numerous studies,in-depth knowledge of filler-bitumen reciprocity at a microscale level is yet to be *** goal of this research is to gain a better understanding of the fillerbitumen microscale interaction in terms of the synergy and coaction between the physicochemical and rheological performance of mastics due to filler *** rheological properties of two sustainable mastics,dolomite powder(DP)and lime kiln dust(LKD),together with a neat PEN 60/70 binder,were analysed based on a temperature sweep at elevated temperature ***,frequency sweep and multiple stress creep recovery(MSCR)tests were also conducted at pavement serviceability temperature using the dynamic shear rheometer(DSR).Physicochemical tests using a scanning electron microscope(SEM)and energy dispersive X-rays(EDX)were conducted to analyse the impact of parameters such as particle shape,grain size,texture,and chemical *** DSR test results showcased how the incorporation of fillers in asphalt binder considerably improved the performance of the binder in terms of rutting and ***,its strain and nonrecoverable compliance parameters were substantially reduced at higher filler and binder *** filler attributes of low rigden voids(R.V),high fineness modulus(FM),and high specific surface area(SSA)led to greater interfacial stiffness and elasticity in LKD mastics compared to DP mastics at different loading frequencies and temperature *** SEM/EDX results also indicated that the elemental calcium and carbon composition of each filler component,together with its grain morphology,strongly influenced its rheological performance.

关键词： Asphalt mastics Industrial by-product Waste recycling Sustainable material consumption Rheological behaviour Chemical characterisation

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Comparison of microscopy and PCR for the detection of human Plasmodium species and Plasmodium knowlesi in southern Myanmar

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Asian Pacific Journal of Tropical Biomedicine 2017年第8期7卷 680-685页

作者： Thu Zar Han Kay Thwe Han Kyin Hla Aye Thaung Hlaing Kyaw zin Thant Indra Vythilingam md.Programme Faculty of Medicine&Health SciencesUCSI University Department of Medical Research Lower Myanmar Vector Borne Diseases Control Unit Department of Health Department of Parasitology University Malaya

To determine the distribution of Plasmodium (P) species including Plasmodium knowlesi and to compare the specificity and sensitivity of microscopy with nested PCR in malaria *** study was conducted in Kawthaung, southern Myanmar. Ninety clinically suspected malaria patients were screened for malaria by Giemsa stained microscopy and confirmed by nested *** the participants, 57 (63.3%) were positive and 33 (36.7%) were negative by microscopy. Of positive samples, 39 (68.4%) were Plasmodium falciparum, 17 (29.8%) Plasmodium vivax and 1 (1.8%) Plasmodium malariae, whereas 59-amplified by PCR were 40 (67.8%), 18 (30.5%) and 1 (1.7%) respectively. PCR amplified 2 microscopy negative samples. Two samples of P. falciparum detected by microscopy were amplified as P. vivax and vice versa. All samples were negative for Plasmodium ovale, P. knowlesi and mixed infections. Microscopy had a very good measure of agreement (κ = 0.95) compared to nested PCR. Sensitivity and specificity of microscopy for diagnosis of P. falciparum were 92.5% (95% CI: 79.6-98.4) and 96.0% (95% CI: 86.3-99.5) respectively, whereas for P. vivax were 83.3% (95% CI: 58.6-96.4) and 97.2% (95% CI: 90.3-99.7).ConclusionsP. knowlesi was not detected by both microscopy and PCR. Giemsa stained microscopy can still be applied as primary method for malaria diagnosis and is considered as gold standard. As to the lower sensitivity of microscopy for vivax malaria, those with previous history of malaria and relapse cases should be diagnosed by RDT or PCR combined with microscopy. Inaccuracy of species diagnosis highlighted the requirement of training and refresher courses for microscopists.

关键词： Malaria Plasmodium Plasmodium knowlesi Microscopy

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