Insight into the Sorption and Activation Energy Phenomenon of Kenaf Shive Sorbents in Crude Oil/Water Mixture
Z. M. Salisu
*
National Research Institute for Chemical Technology (NARICT), Basawa, Zaria, Nigeria.
Y. L. Gambo
Center for Energy Research and Training (CERT), Ahmadu Bello University (ABU), Zaria, Nigeria.
M. A. Suleiman
National Research Institute for Chemical Technology (NARICT), Basawa, Zaria, Nigeria.
M. K. Yakubu
Department of Polymer and Textile Engineering, Ahmadu Bello University (ABU), Zaria, Nigeria.
B. H. Diya’uddeen
Center for Energy Research and Training (CERT), Ahmadu Bello University (ABU), Zaria, Nigeria.
S. U. Ishiaku
Department of Polymer and Textile Engineering, Ahmadu Bello University (ABU), Zaria, Nigeria.
S. P. Ukanah
Department of Polymer and Textile Engineering, Ahmadu Bello University (ABU), Zaria, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
The secondary effect discovery of synthetic sorbents opened another research direction for many field of studies. However, the sorption parameters of lignocellulosic sorbents are rarely reported most importantly, kenaf shive. This paper centered at the sorption behavior of optimized kenaf shive sorbents using Response Surface Methodology (RSM) via surface deposit technique. Five-level Central Composite Design (CCD) experimental matrix was used to analyze the effect of particle sizes (125-1000 µm), stirring time (5-30min) and methyltrimethoxysilane (MTMS) concentration (5-20% v/v) as individual and combined variables process in the developed sorbents. The unmodified shive was compared with the modified, and it reveals a positive shift in the sorption capability. Instrumental analysis such as FTIR (Fourier Transform Infra-Red), DT-TGA (Differential Thermal-Thermogravimetric analysis) and BET (Brunaure-Emmett-Teller) were carried out on the optimized sorbent and the results were in conformity with the sorption results. The sorption behavior deployed fits the pseudo-first-order and Langmuir isotherm with regression coefficient R2=0.9496 and R2=0.9400. The sorption property was found to be spontaneous and exothermic, however, the activation energy studies shows physic-sorption phenomenon with 25.3 kJmol-1 and R2=0.9360.
Keywords: Lignocellulosic, design matrix, sorbent, isotherm, physic-sorption.