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RISS 인기검색어
- 검색키워드
- 저자 : Mohd Asri Nawi (검색결과 3 건)
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Noor Nazihah Bahrudin,Mohd Asri Nawi,Wan Izhan Nawawi Wan Ismail 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.7
Synthesized polyaniline (PANI) powder mixed with ENR-PVC polymer blend adhesive was immobilized on glass plates for the adsorption of methyl orange (MO) dye. The immobilized PANI composite was made up of plasticized PANI aggregates and was in a doped state. The incorporation of ENR-PVC blend in PANI slightly reduced the surface area from 9.2 to 8.5m2 g1, and its presence was confirmed through FTIR. The adsorption process was highly dependent on the aeration rate, and the pH of MO solution in which 40mL min1 and ambient pH (6.5) was selected as the working conditions. The process of MO uptake onto the immobilized PANI obeyed the pseudo-second-order kinetic model, while intra-particle diffusion was found to dominate the adsorption process. The qm of the immobilized PANI was 77.3mg g1 for MO uptake and obeyed the Freundlich isotherm model. The thermodynamic study revealed that the adsorption process of immobilized PANI was spontaneous and unfavorable at high temperature. The immobilized PANI was found to be comparable with other PANI based adsorbents in term of cost, recyclability and adsorption efficiency.
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Noor Nazihah Bahrudin,Mohd Asri Nawi 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.7
Titanium dioxide (TiO2) and powdered activated carbon (PAC) were fabricated via a layer by layer arrangement on a glass plate using a dip-coating technique for the photocatalytic-adsorptive removal of phenol. Thinner TiO2 layer coated on PAC sub-layer has larger surface area and better phenol removal than the thicker TiO2 layer. The system obeyed the Langmuir isotherm model, which exhibited a homogeneous and monolayer adsorption with a maximum capacity of 27.8mg g1. The intra-particle diffusion was the rate-limiting step as the linear plot crossed the origin, while the adsorption was unfavorable at elevated temperature. Under light irradiation, the TiO2/PAC system removed phenol two-times more effectively than the TiO2 monolayer due to the synergistic effect of photocatalysis by TiO2 top layer and adsorption by PAC sub-layer. The COD removal of phenol was rapid for 10mg L1 of concentration and under solar light irradiation. It was shown that the PAC sub-layer plays a significant role in the total removal of phenol by providing the adsorption sites and slowing down the recombination rate of charge carriers to improve the TiO2 photocatalytic oxidation performance.
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Noor Nazihah Bahrudin,Mohd Asri Nawi 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.3
Chitosan-montmorillonite (CS-MT) composites of different MT composition were prepared in 5% of acetic acid solution and fabricated on glass plates. The composite film was then combined with TiO2 in an immobilized layer-layer manner for removing methyl orange dye via synergistic photocatalytic-adsorption processes. The effects of MT addition to the CS matrix were investigated with respect to the physicochemical and optical properties. The presence of MT within the composite reduced the swelling and improved the adhesiveness as well as the thermal stability of CS. The MT clay assisted in producing higher hydroxyl radicals and improving the solid-state oxidation of CS within the adsorbent sub-layer for the photocatalytic enhancement of TiO2/CS-MT than its counterpart TiO2/CS. Subsequently, the photocatalytic activity of the TiO2/CS-MT was 1.3 and 4.2-times better than the TiO2/CS and TiO2 photocatalysts, respectively. This TiO2/CS-MT photocatalyst was also reusable for at least ten cycles of application.
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