title: Removal of toxic mercury from petroleum oil by newly synthesized molecularly-imprinted polymer.
abstract: In recent years, molecularly-imprinted polymers (MIPs) have attracted the attention of several researchers due to their capability for molecular recognition, easiness of preparation, stability and cost-effective production. By taking advantage of these facts, Hg(II) imprinted and non-imprinted copolymers were prepared by polymerizing mercury nitrate stock solution (or without it) with methacrylic acid (MAA), 2-hydroxyl ethyl methacrylate (HEMA), methanol and ethylene glycol dimethacrylate (EGDMA) as the monomer, co-monomer solvent (porogen) and cross-linker, respectively. Thus, the formed Hg(II) imprinted polymer was characterized by using Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), Brunauer, Emmett and Teller (BET) and thermal gravimetric analysis (TGA). The separation and preconcentration characteristics of Hg(II) imprinted polymer were investigated by solid phase extraction (SPE) procedures, and an optimal pH of 7 was investigated as ideal. The specific surface area of the Hg(II) imprinted polymer was found to be 19.45 m2/g with a size range from 100 to 140 µm in diameter. The maximum adsorption capacity was observed to be 1.11 mg/g of Hg(II) imprinted beads with 87.54% removal of Hg(II) ions within the first 5 min. The results of the study therefore confirm that the Hg(II) imprinted polymer can be used multiple times without significantly losing its adsorption capacity.
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. khairinorainshahera@yahoo.com.
authors.forename: Nor Ain Shahera
authors.initials: NA
authors.lastname: Khairi
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. azahy@upm.edu.my.|Institute of Advanced Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. azahy@upm.edu.my.
authors.forename: Nor Azah
authors.initials: NA
authors.lastname: Yusof
authors.affiliation: Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. halim@upm.edu.my.
authors.forename: Abdul Halim
authors.initials: AH
authors.lastname: Abdullah
authors.affiliation: Institute of Advanced Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. farooqm1983@gmail.com.
authors.forename: Faruq
authors.initials: F
authors.lastname: Mohammad
mesh_terms: D000327:Adsorption; D008628:Mercury / Q000302:isolation & purification*; D008689:Methacrylates / Q000737:chemistry; D054802:Molecular Imprinting / Q000379:methods; D010578:Petroleum / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods
chemical_list: D008689:Methacrylates; D010578:Petroleum; D011108:Polymers; C008384:methacrylic acid; C005044:hydroxyethyl methacrylate; C004919:ethylene dimethacrylate; D008628:Mercury
keywords: Freundlich isotherm; cysteine complex; mercury removal; molecularly-imprinted polymer; petroleum oil