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- 저자 : W. M. A. W. Daud (검색결과 2 건)
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I. K. Erabee,A. Ahsan,Bipin Jose,M. Manniruzzaman A. Aziz,A. W. M. Ng,S. Idrus,N. N. N. Daud 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
Activated Carbon (AC) is an adsorbent having high surface area which makes the process of removing heavy metals fromwastewater (such as landfill leachate) very effective. This study explored the utilization of three methods of modification of ACproduced from coconut shell by treating it with nitric acid (HNO3), potassium permanganate (KMnO4) and heating at 600oC toimprove the adsorption capacity. The AC can remove multi-pollutants in the filtration process which was used to treat landfillleachate. The water quality parameters such as pH, TSS, Ammonia-Nitrogen and a few heavy metals were considered in the presentstudy. Results showed that the removal of these parameters was proportional with the increase of contact time and the bed depth ofAC. The isotherm analysis of the adsorption of modified AC showed the best Removal Efficiency (RE) can be achieved when ACtreated with KMnO4 for NH3-N, zinc, TSS and sulphide. The morphology of the AC was studied through Scanning ElectronMicroscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX) pattern analysis and Fourier Transform Infrared (FTIR) analysis. It was found that various types of oxygen functional groups were introduced onto the surface of coconut shell derived AC throughoxidation using HNO3. FTIR was used to characterize the surface oxygen functional groups. The surface functional groups such asN-H and C-H stretching played a significant role in heavy metals adsorption. Hence, it can be concluded that the hybrid technique byusing electrolysis process with AC adsorption be an effective way to remove the suspended solids and heavy metals from landfillleachate and thus able to reduce environmental pollution.
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Duduku Krishnaiah,Collin G. Joseph,S. M. Anisuzzaman,W. M. A. W. Daud,M. Sundang,Y. C. Leow 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
Activated carbons (ACs) were prepared from papaya seeds with different dry weight impregnation ratios of zinc chloride (ZnCl2) to papaya seeds by using a two-stage self-generated atmosphere method. The papaya seeds were first semi-carbonized in a muffle furnace at 300 oC for 1 h and then impregnated with ZnCl2 before activation at 500 oC for 2 h. Several physical and chemical characteristics such as moisture, ash, pH, functional groups, morphological structure and porosity of prepared ACs were studied and presented here. AC2, with the impregnation ration of 1 : 2 (papaya seeds: ZnCl2), yielded a product that had the highest adsorption capacity, 91.75%, achieved after 180min contact time. The maximum Brunauer, Emmett and Teller (BET) surface area of AC2 was 546m2/g. Adsorption studies indicated that AC2 complied well with the Langmuir isotherm (qm=39.683mg g−1) and the pseudo-second-order (qe=29.36mg g−1). This indicated that chemisorption was the primary adsorption method for AC2. The intraparticle diffusion model proved that the mechanism of adsorption was separated into two stages: the instantaneous stage and the gradual adsorption stage. Overall, this work demonstrated the suitability of using papaya seeds as a precursor to manufacture activated carbon.
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