Sara Yasina Yusuf
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Preferred name
Sara Yasina Yusuf
Official Name
Sara Yasina, Yusuf
Alternative Name
Yusuf, S. Y.A.
Yusof, Sara Yasina
Yusuf, Sara Yasina
Yusuf, Sara Y.
Yusof, S. Y.
Sara, Y. Y.
Yusuf, S. Y.
Main Affiliation
Scopus Author ID
57221740411
Researcher ID
B-9242-2012

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  • Publication
    Optimization of copper adsorption from synthetic wastewater by oil palm-based adsorbent using Central Composite Design
    ( 2020-06-10)
    Wong H.W.
    ;
    Naimah Ibrahim
    ;
    Muhammad Adli Hanif
    ;
    Norazian Mohamed Noor
    ;
    Sara Yasina Yusuf
    ;
    Masitah Hasan
    Oil palm empty fruit bunch (EFB) was chemically activated by phosphoric acid and heat treatment to produce porous activated carbon (AC) for adsorption of copper ions from synthetic wastewater using static batch test. Copper adsorption process was optimized using Response Surface Method (RSM) by varying four operating parameters i.e. pH (A), initial concentration (B), adsorbent dosage (C) and contact time (D) through a quadratic model developed based on Central Composite Design (CCD) approach. Within the tested parameter range, copper adsorption was found to be at optimum condition at pH 5, initial concentration of 200 mg/L, adsorbent dosage of 0.55 g per 200 mL copper solution and contact time of 2.5 hours, yielding 52.5% of copper removal. A good agreement was achieved by comparing the predicted model with experimental data (R2=0.9618). All four operating parameters tested are significant in affecting the adsorption process, with pH being the most significant with an F-value of 171.70. The interaction between pH and initial concentration (AB) has the most significant interacting effects (F-value of 18.30), while quadratic effects of pH (A2) and adsorbent dosage (C2) are most significant with F-values of 62.80 and 42.58 respectively.
      3  23
  • Publication
    Removal of molluscicide compound: A comparison of metaldehyde removal performance between rubber-based aerobic granules and molasses-based aerobic granules
    ( 2023-12-01)
    Saad A.M.
    ;
    Farrah Aini Dahalan
    ;
    Naimah Ibrahim
    ;
    Sara Yasina Yusuf
    Rubber-based aerobic granules (RAGS) were developed in a bioreactor. Outside of the bioreactor, RAGS were supplemented with molasses wastewater to produce molasses-based aerobic granules (MAGS). Rates of RAGS and MAGS elimination and growth were calculated across a range of 180–330 mg/L of metaldehyde. Metaldehyde removal rates for RAGS and MAGS were 84 % and 85 %, correspondingly. Rates of biodegradation (K1) ranged from 0.402 to 0.063 h−1 for RAGS and from 0.404 to 0.065 h−1 for MAGS. There was a negative correlation between metaldehyde concentration and the first-order rate constant. MAGS had somewhat higher metaldehyde removal capacities than RAGS, with a lower Ks value (234 mg/L) than RAGS (282 mg/L). The MAGS had a higher μmax (0.188 day−1) value than the RAGS (0.129 day−1). RAGS and MAGS show promise for use in aerobic granular sludge remedy of wastewater due to their ability to degrade metaldehyde.
      1
  • Publication
    Temporal and spatial variability of PM10 in daycare centres in Perlis
    ( 2020-06-10)
    Sara Yasina Yusuf
    ;
    Marianne M.A.
    ;
    Abdullah L.C.
    ;
    Naimah Ibrahim
    ;
    Norazian Mohamed Noor
    A good indoor air quality (IAQ) is preferred for a healthy and safe indoor environment especially for children since they are more susceptible to the effects from indoor pollutants. Most of indoor air pollution researches focus on the health effect on the children but they eliminate the possibility of how the environmental factors and daycare characteristics could contribute to this problem. This study investigates the concentration level of PM10 and its relationship with environmental factors and daycare centers characteristics and two different sampling sites, representing residential and near roadside. Gravimetrical method was used in order to present spatiotemporal analysis utilizing descriptive analysis, Pearson Correlation and Coefficient of Divergence (COD) treatments of data. The average indoor concentration in Taska Penyayang 1 Malaysia (TP1M, representing residential setting) were 105.97 ° 40.06 μg/m3 indoor and 50.77 ° 30.85 μg/m3 outdoor. Taska Penyayang Permata (TPP), represented near roadside setting were 59.88 ° 18.53 μg/m3 and 69.09 ° 23.54 μg/m3 indoor and outdoor, respectively. PM10 variations at TP1M was observed to be originated from indoor/local strong sources and was minimally influenced by weather parameters and outdoor infiltration. Infiltration of pollutants occurred at TP1M, showed by large IOR (above unity) while exfiltration of pollutants governed at TPP, indicated by low IOR and insignificant COD values between all of its micro-location. Natural ventilation as practiced by TPP may also be the reason of very much lower levels of PM10 concentration, evidenced by strong positive correlation between number of occupants and inverse correlation between number of activities. Lower frequency of activities accumulates PM10, contributing to its higher level. In contrast, persistent closed-windows and doors may contribute to inadequate ventilation and accumulated air pollutants, as observed at TP1M. This has been evident by higher COD correlation, indicating similar sources of PM10 at micro-environments with outdoor air.
      2  16
  • Publication
    Surface alkali promotion of carbon dioxide hydrogenation for conservation of carbon sources: Cyclic voltammetry study
    ( 2020-01-01)
    Tan S.Y.
    ;
    Naimah Ibrahim
    ;
    Umi Fazara Md Ali
    ;
    Sara Yasina Yusuf
    ;
    Aroua M.K.
    Conversion of CO2 captured from biogas upgrading process into useful chemicals or fuels e.g. methane is an attractive route towards conservation of carbon sources. Sustainable hydrogenation route could be achieved by combining the process with hydrogen generated from water electrolysis. In this work, cyclic voltammetry was used as preliminary technique to probe the electrochemical behaviour of Na-modified Pt/YSZ as model catalyst under CO2 hydrogenation. The reaction is irreversible and the voltammogram features are not easily distinguishable under reaction conditions. The increase in cathodic peak height and the decrease in peak potential with addition of sodium at low coverage (0.32%) indicated that the charge transfer reaction was enhanced and thus the methanation reaction could be electrochemically promoted given sufficient amount of H2 flow. However, increasing Na coverage was found to decrease the current hysteresis possibly due to formation of sodium compounds such as carbonates or oxides that populate the three-phase-boundary (tpb) active sites, thus deactivating the catalyst.
      1