Investigation the Adsorption of Heavy Oil from Solution by Low-Cost Material

Abstract:

Over the last decades, there has been increasing global concern over the public health impacts attributed to environmental pollution. Natural materials that are available in large quantities or certain waste from agricultural operations may have the potential to be used as low cost adsorbent ,widely available and are environmentally friendly after using them. Thus, rice husk RH, a commonly available waste in Iraq. RH and activated rice husk ARH (pretreated by 13M H2SO4 with 0.5 NaOH and thermally treated at573k) have been studied as sorbents for heavy oil cleanup operations in the aqueous environment (water pumped from brooks to sedimentation unit). Batch adsorption experiments were performed as a function of pH (2-10) , adsorbent dose(0.25-1g ), initial concentration (1-20g/100ml water) , agitation time (15-75min) and different temperature(298-338K),with100rpm.The maximum removal took place in the pH range of 8, adsorbent dose 1g ,initial concentration 20g/100ml water , agitation time 45 min and temperature 338k . The sorption data obtained from studies at optimized conditions have been subject to Freundlich and Langmuir isotherm studies .The data fits well to both the Freundlich and Langmuir isotherm models indicating favorable and monolayer adsorption .X-ray diffraction analysis ,which indicates that the RH and ARH mainly consist of amorphous materials .The adsorbents were characterized using FTIR . It was found that the pretreatment of rice husk increase the specific surface area and changed the functional groups , therefore leads to increase the capacity of adsorption.

• Periodical: Advanced Materials Research (Volumes 463-464)
• Pages: 90-96
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.463-464.90
• Online since: February 2012
• Authors: Kadhim F. Al-Sultani
• Keywords: Activated Rice Husk, Batch Studies, Brooks Water, Heavy Oil, Isotherm, Rice Husk

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[11] Properties Heavy oil xSpecific gravity at 15. 6 oc max. 0. 9593 Flash Point at P. M oc min. Viscosity 65 CST. at 37. 8o cmax. 370 CST. at 50oc max. 180 Pour Point CST. at oc 21 Sulphur %Wt. max. 3. 5 Water and sediment %v. max. 1. 0 Calorific Value Kcal/Kg 10200 Sampling Batch reactor Concentration – time profile Fig. 1 Schematic illustration of the experimental batch process.

[12] V: volume of solute, C0: Initial concentration and Ct: Concentration at given time . Fig. 2 Effect of pH in the removal of heave oil by RH and ARH with 100 rpm. Fig. 3 The effect of adsorbent dose in removal of heavy oil by ARH and RH with 100 rpm. Fig. 4 The effect initial concentration on the removal by heavy oil by ARH and RH with 100 rpm. Fig. 5 The effect of agitation time in the removal by heavy oil by ARH and RH with 100 rpm. Fig. 6 The effect of difference temperature in the removal heavy oil by ARH and RH with 100 rpm. Fig. 7 Langmuir plot for adsorption of heavy oil by RH and ARH with pH=8, T=298k, agitation time=45 min, adsorbent dose = 1 g/100 ml water. Fig. 8 Freundlich plot for adsorption of heavy oil by RH and ARH, with pH=10, T=298k, agitation time = 45 min and adsorbent dose = 1g/100 ml water. Fig. 9 X-ray powder diffraction of RH Fig. 10 Infrared vibration spectrum FTIR of RH with heavy oil.

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