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      https://www.ias.ac.in/article/fulltext/boms/039/02/0437-0450

    • Keywords

       

      Model fuel; thiophene; selectivity; adsorptive removal; reusability.

    • Abstract

       

      Activated carbon (AC) and multiwall carbon nanotubes (CNT) doped with 1, 5 and 10% Ni in the form of nickel oxide nanoparticles were prepared using the wetness impregnation method. These percentages were denoted by the endings NI1, NI5 and NI10 in the notations ACNI1, ACNI5, ACNI10 and CNTNI1, CNTNI5, CNTNIL10, respectively. The physicochemical properties for these adsorbents were characterized using N$_2$ adsorption–desorption surface area analyzer, thermal gravimetric analysis (TGA), scanning electron microscopy, energy-dispersive X-ray spectroscopy, field-emission transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectrometre. Adsorption isotherms were obtained and desulphurization kinetics were carried out on solutions of dibenzothiophene (DBT) and thiophene in a model fuel. The efficiencies of DBT and thiophene removal were reported. The adsorption isotherms fitted the Langmuir and Freundlich models. The highest adsorption capacity for DBT was $74\pm 5$ mg g$^{−1}$ on ACNI5; the maximum adsorption capacities of the other adsorbents followed the trend ${\rm ACNI1 > ACNI10 > AC > CNTNI5 > CNTNI1 > CNTNI10 > CNT}$. The adsorption rates for DBT and thiophene followed pseudo-second-order kinetics. The selective removal by these adsorbents of DBT relative to thiophene and naphthalene was evaluated. The adsorbents’ reusability and the effect of the percentage of aromaticcompounds on their adsorption capacity were also reported.

    • Author Affiliations

       

      MAZEN K NAZAL1 2 GHASSAN A OWEIMREEN1 MAZEN KHALED1 MUATAZ A ATIEH3 ISAM H ALJUNDI4 ABDALLA M ABULKIBASH1

      1. Chemistry Department, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia
      2. Center of Environmental & Water at Research Institute, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia
      3. Qatar Environment and Energy Research Institute, Qatar Foundation, PO Box 5825, Doha, Qatar
      4. Chemical Engineering Department, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia
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