Treatment of crude oil polluted water using stearic acid grafted mango seed shell (Mangifera indica) composite

• Published in: Current research in green and sustainable chemistry Vol. 4; p. 100169
• Main Authors: Asadu, Christian O., Elijah, Onu Chijioke, Ogbodo, Nick O., Anthony, Ezema Chinonso, Onyejiuwa, Chime Thomson, Onoh, Maxwell I., Ike, Innocent Sunday, Onoghwarite, Ohimor Evuensiri, Chukwuebuka, Aninwede S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2021; Elsevier
• Subjects: Adsorption; Crude oil; Esterification; Mango seed shell; Regeneration; Regeneration; Adsorption; Crude oil; Esterification; Mango seed shell
• ISSN: 2666-0865; 2666-0865
• DOI: 10.1016/j.crgsc.2021.100169

This work focuses on the treatment of crude oil polluted water using indigenous adsorbent prepared using mango seed shell. Esterification of mango seed shell (MSS) as a novel composite with high surface area and well-ordered framework of porosity was prepared and kinetic and isotherm modelling of crude oil removal considered. Batch adsorption studies were carried out with the function of oil water ratio, pH and temperature. Material characterization was carried out to ascertain the nature of the composite prepared and its affinity to oil sorption. Surface morphology was investigated with scan electron microscope (SEM). Chemical composition of compounds was investigated using X-ray fluorescent machine while the X-ray diffraction machine (XRD) examined the crystallographic nature of the pretreated mango seed shell (MSS). Salt addition techniques was employed for point zero charge analysis at ionic strengths 0.05 and 0.1 ​mol/dm3. The influence of pH, temperature and oil/water ratio was found to be highly significant and strongly influences oil removal by the composite. SEM analysis showed several changes on the surface of the composite after acid treatment. XRF and XRD revealed that the raw MSS were highly composed of quartz. The point zero charge revealed that the surface of esterified MSS was predominately positive charge at pH ranging between 4.06±0.1 and 4.04±0.1. However, the composite exhibited high adsorption efficiency at a very low pH of 5 with 90.69% of crude oil removal. Isotherm modelling revealed that the composite material was highly matched to Temkin isotherm model with maximum adsorption capacity of 50.80 ​mg/g. The kinetic data fitted well with Bahattacharya-Venkobachor model. The regenerated biomass exhibited high performance and functionality and used successively in different adsorption activities. Therefore, esterified MSS composite is an efficient, economic viable and sustainable adsorbent materials suitable in remediation of crude oil polluted water. •An adsorbent was produced using mango seed shell.•The mango seed shell adsorbent was found to be very effective in removing crude oil from water effectively.•The highest adsorption capacity was found to be 50.1 ​g/mg.•Regeneration studies proved that plantain peels adsorbent can be reused after regeneration.•Temkin isotherm model was the model of the best fit.