Undergraduate Research Symposium Chemical and Process Engineering

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Browsing Undergraduate Research Symposium Chemical and Process Engineering by Author "Amarasinghe, BMWPK"

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    item: Conference-Extended-Abstract
    Adsorption and desorption studies of heavy metals on to coconut shell char
    (Department of Chemical and Process Engineering, University of Moratuwa, 2019) Abesekara, MS; Kosvinna, KNR; Amarasinghe, BMWPK; Rathnasiri, PG
    Heavy metals in wastewater can be removed by several methods including adsorption. Activated carbon (AC) is widely used, but expensive adsorbent. Since AC derived from coconut shell (CS) is a good adsorbent, coconut shell char (CSC) as well might be an effective low-cost adsorbent. It was studied the possibilities of using CSC as an adsorbent. Results showed that, CSC has 13% and 12% removal efficiencies for Zn2+ and Ni2+ from solutions of 50 mg/l. Furthermore, desorption abilities of H2SO4, NaOH, Distilled water and NaCl as desorbing agents were analysed and found H2SO4 to be the most effective desorbing agent.
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    item: Conference-Extended-Abstract
    Multicomponent adsorption of heavy metals onto coconut shell char: kinetic and equilibrium study
    (Department of Chemical and Process Engineering, University of Moratuwa, 2019) Perera, RACD; Madushika, MHG; Anupama, KADU; Amarasinghe, BMWPK; Rathnasiri, PG
    Coconut shell (CS) charcoal is a potential low-cost adsorbent. Ni(II) and Zn(II) ions in wastewater removal by adsorption is studied in the research using CS char. Results showed that, the maximum adsorption capacity for the Ni(II) ions system was 14.81% in solution of 50 mg/l. The adsorption data for single component systems fitted with Langmuir isotherm and followed pseudo-second order kinetic model. Increase in initial ion concentration reduces the percentage removal in both single component systems. In the multi-component system, the ion removal increases and then decreases. CS char is a somewhat good adsorbent as the removal efficiencies are close to 20%. Higher dosage should be used for better results. Key words: Adsorption, Coconut shell char, Multicomponent system.
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    item: Conference-Extended-Abstract
    Purification of automobile wastewater using fly ash-clay composite
    (Department of Chemical & Process Engineering University of Moratuwa, 2020-03) Anushan, RGS; Dasanayake, PMK; Karunarathna, CNW; Amarasinghe, BMWPK; Rathnasiri, PG
    The adsorbent fly ash-clay composite was tested for the treatment of automobile service station wastewater. Batch experiments were conducted to establish the adsorption column parameters which were optimum fly ash to clay ratio, kinetic data and adsorption isotherms. 2:1 fly ash to clay ratio was obtained with the highest adsorption capacity. Adsorption kinetics were best fitted into Pseudo second-order kinetic model giving a theoretical adsorption capacity of 156.25mg/g. Equilibrium kinetics data were fitted into Langmuir, Freundlich, Temkin and Dubinin-Radushkevich adsorption isotherms. Experimental data were best fitted to Langmuir adsorption isotherm showing a favorable adsorption.
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    item: Conference-Extended-Abstract
    Tea waste impregnated with iron oxide nano-particles for dye removal from aqueous solutions
    (Department of Chemical & Process Engineering University of Moratuwa, 2020-03) Madhubashani, AMP; Sewwandi, KMNS; Amarasinghe, BMWPK; Rathnasiri, PG
    Textile dyes in wastewater can be removed by several methods including adsorption. In this study, batch experiments were conducted to determine the possibility of the removal of Basic Red 18 (BR18) textile dye from aqueous solutions using Magnetic Nanoparticles loaded Tea Waste (MNLTW). The effects of various parameters such as adsorbent dosage, solution pH, initial dye concentration and contact time were studied under room temperature and kinetic data were fitted to a pseudo second-order model. Experimental results indicated MNLTW is a potential substance that can be used for the removal of BR18 dye from wastewater.
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    item: Conference-Abstract
    Ultrasonic modification of adsorbents for enhancement of the performance in dye removal from aqueous solution
    (Department of Chemical & Process Engineering University of Moratuwa., 2023-08-17) Kuruwita, KHM; Perera, LKKN; Amarasinghe, BMWPK; Walpalage, S; Gunawardena, S; Narayana, M
    The effect of the ultrasonic modification of the adsorbent towards adsorbent capacity for dye removal from aqueous solutions was tested. A cationic dye, Crystal Violet was chosen as the textile dye. The adsorbents for the experiment included commercially available activated carbon, Albizia sawdust, and dried-areca nut husk (puwak). For each adsorbent, two sets of batch adsorption experiments were carried out, one with and one without ultrasonic treatment, while keeping all the other parameters constant. The experimental results showed an increase in adsorption capacity due to sonication. Sonicated activated carbon, saw dust and areca nut husk showed 93%, 92% and 90% dye removal respectively. Activated carbon showed 33% increase in adsorption capacity compared to non-sonicated material, which was the highest enhancement due to sonication, whereas saw dust and areca nut husk showed only 1% and 5.8% increase. Kinetic analysis showed that 86% of the dye removal from the sonicated activated carbon had taken place within the first 16 minutes of the experiment. Kinetic data was fit to the pseudo-second order model. The intra-particle diffusion model proved that film diffusion was significant in controlling the adsorption of dyes onto the adsorbent in addition to intra-particle diffusion. FTIR analysis showed that the existence of hydrogen bonds, C=C bonds, aromatic rings, aliphatic-iodo compounds, and other molecules contributed to the dye adsorption. SEM analysis showed that adsorption had happened into the resultant enlarged pores due to ultrasonic vibrations. The overall summary of the experiment through the results and analysis revealed that the vibration occurred during the ultrasonic treatment was the biggest contributor to enhancement of adsorption capacity of activated carbon.