Sorbent For Removal Of Oil Research Articles

Polystyrene-reduced graphene oxide composite as sorbent for oil removal from an Oil-Water mixture

This study enhanced the adsorptive capacity of polystyrene (PS) by infusing reduced graphene oxide (rGO) nanoparticles obtained from the synthesis of graphene oxide to produce PS-rGO composites via electrospinning method. Physicochemical characterization of as-synthesized rGO and PS-rGO were carried out through scanning electron microscopy, N2 physisorption among others. Oil sorption performance of synthesized rGO in crude oil, vegetable oil, fresh engine oil and used engine oil are 130.96 g/g, 121.77 g/g, 105.01 g/g and 100.56 g/g. Oil sorption capacities of electrospun pure PS in crude oil, vegetable oil, fresh engine oil and used engine oil were 46.32 g/g, 38.54 g/g, 35.14 g/g and 32.57 g/g and those of PS-rGO infused with 4 wt% of rGO were found to be 105.52 g/g, 98.86 g/g, 86.25 g/g and 83.47 g/g for crude oil, vegetable oil, fresh engine oil and used engine oil samples respectively. Pseudo second order (PSO) kinetic model fits the sorption data of the four oil samples on the four composite sorbents produced. Intra-particle diffusion (IPD) model evidently showed that sorption of the four oil samples on the four composite sorbents, occurred in three (3) phases. Composites demonstrate high oil adsorption capacity, and are reusable upto three sorption–desorption cycles.

Comparative analysis of removal of crude oil and some refined petroleum products from the environment using rice husk: Adsorption isotherm and kinetic studies

Rice husk a low cost agricultural waste was assessed for its efficiency as an oil spill sorbent by comparing its oil (crude oil, diesel and kerosine) uptake with that of a standard; conventional synthetic sorbent mat used in oil spill clean-up. The experiment was performed under the same experimental condition and procedure. The sorption process of crude oil, diesel and kerosine onto rice husk and the standard was studied using Langmuir, Freundlich, Elovich, Temkin and Dubinin – Radushkevich adsorption models while the sorption kinetics was studied using Lagergren pseudo-first-order, pseudo-second-order, intraparticle diffusion and liquid film diffusion models. Suitable environmental applicability of both sorbents was also studied.. The result of the study shows that rice husk sorbed 3.30g of crude oil, 2.50g of diesel and 1.95g of kerosine per unit mass while the standard sorbed 11.50g of crude oil, 10.34g of diesel and 8.20g of kerosine per uint mass. About 2.46g of crude oil, 1.60g of diesel and 1.57g of kerosine were recovered from a unit mass of rice husk, while, 9.67g of crude oil, 8.40g of diesel and 6.50g of kerosine were recovered from a unit mass of synthetic sorbent mat. The amount of oils retained by a unit mass of rice husk is about 0.84g of crude oil (25 % of absorbed crude oil), 0.90g of diesel (36 % of absorbed diesel), and 0.38g of kerosine (20 % of absorbed kerosine), while, 1.83g of crude oil (15 % of absorbed crude oil), 1.94g of diesel (19 % of absorbed diesel) and 1.70g of kerosine (20 % of absorbed kerosine) were retained by a unit mass of synthetic sorbent mat. The result of the study indicates that the standard is a better sorbent for oil removal than rice husk. Rice husk has the ability to retain sorbed oil which makes it a good sorbent when oil recovery is not required. The sorption process for both sorbents follows the Langmuir isotherm. intraparticle diffusion contributed more than liquid film diffusion in the sorption mechanism for the standard, while the reverse is the case for rice husk. The standard and rice husk can be applied on oil spill clean-up on land and surface waters. Rice husk is not a very efficient sorbent for oil spill mop.

Removal of oil by walnut shell media

Studies were conducted to evaluate the oil sorption capacities of walnut shell media. Sorption capacity is the weight of oil picked up by unit weight of a sorbent. Initial oil pick-up by walnut shell media on pure oil and oil on aqueous medium was evaluated. Batch kinetic studies were conducted to evaluate the equilibrium time required by walnut shell media for sorbing oil. For pure oil medium, sorption capacities of 0.30 g/g, 0.51 g/g and 0.58 g/g were obtained for standard mineral oil, vegetable oil and DoALL Bright-Edge oil, respectively. The results showed sorption capacities of 0.56 g/g, 0.58 g/g and 0.74 g/g for standard mineral oil, vegetable oil and DoALL Bright-Edge oil, respectively, for oil on aqueous medium. It was found that sorbed oil could be recovered from walnut shell media by applying pressure. The study showed that walnut shell media can be used as a sorbent for oil removal.