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- 저자 : N. N. N. Daud (검색결과 3 건)
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Roozbeh Hoseinzadeh Hesas,Arash Arami-Niya,Wan Mohd Ashri Wan Daud,J.N. Sahu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Activated carbon (AC) was prepared from oil palm shell using different ratios of KOH as an activation agent and various microwave irradiation powers. To study the effects of physical agents, the impregnated precursors were activated under a flow of CO2 or N2. Maximum BET surface areas of 1196 and 1630 m2/g were achieved in the presence of CO2 and N2, respectively. The textural properties of the samples with the highest surface areas were investigated using ultimate and proximate analyses, SEM and FTIR. The CO2 adsorption results suggest that the ACs are promising adsorbents for gas separation or storage applications.
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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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Behavior of reinforced concrete segmental hollow core slabs under monotonic and repeated loadings
Najm, Ibrahim N.,Daud, Raid A.,Al-Azzawi, Adel A. Techno-Press 2019 Structural monitoring and maintenance Vol.6 No.4
This study investigated experimentally the response of thick reinforced concrete specimens having hollow cores with critical parameters. The investigation includes testing of twelve specimens that are solid and hollow-core slab models. Each specimen consists of two pieces, the piece dimensions are (1.2 m) length, (0.3 m) width and (20 cm) thickness tested under both monotonic and repeated loading. The test program is carried out to study the effects of load type, core diameters, core shape, number of cores, and steel fiber existence. Load versus deflection at mid span, failure modes, and crack patterns were obtained during the test. The test results showed that core shape and core number has remarkable influenced on cracking pattern, ultimate load, and failure mode. Also, when considering repeated loading protocol, the ultimate load capacity, load at yielding, and ductility is reduced.
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