Anis Atikah Ahmad
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Anis Atikah Ahmad
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Anis Atikah, Ahmad
Alternative Name
Ahmad, Anis Atikah
Ahmad, Anis A.
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Scopus Author ID
56900415200
Researcher ID
P-6794-2018

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  • Publication
    Atenolol sequestration using activated carbon derived from gasified Glyricidia sepium
    (Elsevier, 2020)
    Anis Atikah Ahmad
    ;
    Azam Taufik Mohd Din
    ;
    Nasehir Khan E.M. Yahaya
    ;
    Jamilah Karim
    ;
    Mohd Azmier Ahmad
    Activated carbon (AC) derived from gasified Glyricidia sepium woodchip (GGSWAC) was prepared using KOH and CO2 activation via microwave radiation technique to remove atenolol (ATN) from aqueous solution. The surface area (SBET) and total pore volume (TPV) of GGSWAC were 483.07 m2/g and 0.255 cm3, respectively. The n-BET model fits well with the isothermal data indicating a multilayer adsorption with the saturation capacity of 121, 143 and 163 mg/g at 30, 45 and 60 °C, respectively. The kinetic study showed that ATN adsorption followed Avrami model equation (R2 ≅ 0.99). Based on the thermodynamic parameters, the adsorption of ATN onto GGSWAC was endothermic (ΔHS = 234.17 kJ/mol) in the first layer of adsorption and exothermic in the subsequent layer (ΔHL = −165.62 kJ/mol). The ATN adsorption was controlled by both diffusion and chemisorption. In continuous operation, the Thomas (R2 = 0.9822) and Yoon–Nelson (R2 = 0.9817) models successfully predicted the ATN adsorption.
      10  4
  • Publication
    Honeycomb-like porous-activated carbon derived from gasification waste for malachite green adsorption: equilibrium, kinetic, thermodynamic and fixed-bed column analysis
    (Elsevier, 2020)
    Anis Atikah Ahmad
    ;
    Mohd Azmier Ahmad
    ;
    Nasehir Khan E.M. Yahaya
    ;
    Azam Taufik Mohd Din
    ;
    Ahmad Radi Wan Yaakub
    In this study, the preparation conditions for the gasification waste-based activated carbon (GWAC) were optimized with malachite green (MG) dye removal and GWAC yield as responses. The adsorption equilibrium, kinetic behavior, and thermodynamics properties were also ana-lyzed. The optimum conditions for synthesizing GWAC were found at a radiation power, time, and impregnation ratios of 616 W, 1 min, and 1.06 g g–1, respectively, which resulted in an 89.98% yield of GWAC and 99.01% MG removal. This sample shows the surface area and total pore volume of 351.92 m2 g–1 and 0.22 cm3, respectively. For the isotherm study, the Fritz–Schlünder model fitted the adsorption data very well with an R2 value of 0.9919–0.9932. The results of the kinetic study showed that the MG adsorption followed a pseudo-first-order kinetic model (R2 = 0.9625–0.9871). The film diffusion was found to be the rate-limiting step of MG adsorption. The adsorption of the MG dye onto GWAC was an endothermic and spontaneous process with ΔH of 9.183 kJ mol–1. In continuous mode, Thomas and Yoon–Nelson models successfully predicted the MG adsorption on the GWAC. GWAC demonstrates its commercial feasibility based on a low production cost of 0.23 USD kg–1.
      20  4