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Abdul Rahman Abdul Rahim,Iswarya,Khairiraihanna Johari,Nasir Shehzad,Norasikin Saman,Hanapi Mat 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.4
Desiccated coconut waste (DCW) is an agricultural waste that originates from the coconut milk processing industry. In this study, it was utilized for the removal of copper (Cu(II)) and nickel (Ni(II)) via adsorption process. The physicochemical characterization of the DCW adsorbent shows that the adsorbent have a surface area of 6.63 ㎡/g, have high elemental carbon content and existences of important functional groups on its surface. The adsorptive capability of DCW adsorbent in removing the heavy metal were conducted in batch studies. DCW adsorbent performed highest Ni(II) and Cu(II) adsorption capacity at pH 6, where equilibrium is achieved at 450 minutes. The kinetic analysis showed the adsorption agreed with pseudo-second order kinetic model, indicating the Cu(II) and Ni(II) adsorption were a chemical adsorption, limited by the film diffusion. The DCW adsorbent still retained its effective adsorption capacity after 2 adsorption-desorption cycles, which is one of the excellent criteria of a good adsorbent for an adsorption process.
Nur Izzatie Hannah Razman,Salasiah Endud,Zainab Ramli,Hendrik Oktendy Lintang,Izan Izwan Misnon,Hanapi Mat 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
Ordered carbon (OC) with large surface area was prepared via replication by using Santa BarbaraAmorphous-15 as a template and sucrose as a carbon precursor. The prepared OC was thennoncovalently functionalized with Basic Red 2 dye precursor (BR2) to obtain OC–BR2, a nitrogen-containing carbon-based nanocomposite with enhanced electrical properties. The functionalization wasexplained through adsorption isotherm, kinetic, and thermodynamic studies performed under variableconditions. The electrochemical performance test results demonstrated that the nanocompositepresents enhanced capacitance (48.4%) compared with the original OC, with maximum specificcapacitance of 227 F g 1 at 0.5 A g 1 in 1 M KOH electrolyte.
Safia Syazana Mohtar,Norasikin Saman,Ahmad Mujahid Md Noor,Tengku Nur Zulaikha Tengku Malim Busu,Nor Aida Yusoff,Hanapi Mat 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.5
Flocculation kinetics and sludge dewatering of kaolin suspension as influenced by various q-EFBC flocculant dosing were studied. In this study, 62.5mg L1 q-EFBC exhibited the highest turbidity removal efficiency of 99.53± 0.08%. The adsorption rate of kaolin towards 12.5mg L1 to 112.5mg L1 q-EFBC dosing increased rapidly for t<60 s and became gradual before completion. The mass transfer coefficient was independent of dosage. The experimental data best-fitted the non-linear pseudo-first order due to the R2>0.99 and the lowest standard deviation. The highest rate constant of particle aggregation and breakage was consistent with the highest rate constant of particle collision, which led to the highest turbidity removal at the optimal dosage. The rate-limiting steps in the flocculation process were particle collision and aggregation since their rate constant was lower than the other kinetic constants. The lower values of SRF and TTF of treated sludge as compared to the untreated one confirmed the improvement in the dewaterability characteristic. The lowest TTF (37.44±1.44 s) and SRF (1.49×1010 m kg1) was observed for 62.5mg L1 q-EFBC. The high turbidity removal and improved sludge dewaterability indicate the potential application of q-EFBC for water treatment.
Norasikin Saman,Helen Kong,Safia Syazana Mohtar,Khairiraihanna Johari,Azmi Fadziyana Mansor,Onn Hassan,Noorhalieza Ali,Hanapi Mat 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.7
The adsorption dynamics of inorganic mercury, Hg(II) and organic methylmercury, MeHg(II) removal by low-cost reactive agrowaste adsorbents namely CP-Pure, CP-MPTES and CP-RR was investigated in a fixed-bed adsorber. The results show that the breakthrough and saturation times were delayed with decreasing flow rate (F) and initial concentration (Co), and increasing bed height (Z). The Hg(II) possessed better adsorption performance than MeHg(II). The isotherm and kinetic model analyses of adsorption data followed the Temkin isotherm and the pseudosecond order kinetic models, respectively. The breakthrough curve was simulated well by the Thomas and Yoon-Nelson models, and then was further used for scale-up studies. The empty bed contact time (EBCT) concept was successfully demonstrated for the adsorber design and scale-up studies. The regeneration studies showed that the regenerated CP-Pure and CP-MPTES have a high regeneration efficiency up to third adsorption cycle
Norasikin Saman,Gamal Abdulaziz Mohammed Alaghbari,Safia Syazana Mohtar,Helen Kong,Khairiraihanna Johari,Noorhalieza Ali,Hanapi Mat 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Pure silica nanocapsules (SiNC-P) and elemental sulfur-encapsulated silica nanocapsules (SiNC-ES) as Ag(I) adsorbents were successfully synthesized by a one-step water-in-oil microemulsion polymerization process. The characterization of the synthesized materials, such as surface morphology, surface area, porosity, functional groups and thermal characteristics, was carried out using various analytical techniques. The SiNC-P and SiNC-ES have nearly similar morphology, but the surface area and pore size of the SiNC-ES are higher than SiNC-P. The Ag(I) adsorption study showed that it increased with increasing elemental sulfur (ES) amount in the SiNC-ES. The SiNC-ES shows high adsorption capacity, independent of pH, and higher adsorption rate as compared to SiNC-P. The maximum Ag(I) adsorption capacity of SiNC-P and SiNC-ES was 50.49mg g1 and 98.51mg g1, respectively. The adsorption isotherm data were best described by the Langmuir model. The diffusion modeling analysis of the kinetic data indicated that film diffusion is the controlling step, while chemical reaction modeling obeys the pseudo-second-order kinetic model. The SiNC-ES was reusable and good adsorption performance up to four adsorption cycles was observed. The practical capability of the SiNC-ES to adsorb Ag(I) was successfully demonstrated using an industrial waste solution in which a high removal efficiency was observed (>90%). This demonstrates that the SiNC-ES can be a potential adsorbent for Ag(I) recovery from industrial wastes.