title: Hybrid porous phosphate heterostructures as adsorbents of Hg(II) and Ni(II) from industrial sewage.
abstract: Porous phosphate heterostructures (PPH), functionalized with different ratios of aminopropyl and mercaptopropyl groups, labelled as N(x=5,25,50)-PPH and S(x=5,25,50)-PPH, respectively, were tested as adsorbents for Ni(II) and Hg(II) found in industrial sewage from electroplating processes and button battery recycling. X-ray diffraction was used to study the structures. The specific surface area of the pristine material (PPH) was 620 m(2)g(-1), whereas the specific surface areas of the modified mercaptopropyl (S(5)-PPH) and aminopropyl (N(5)-PPH) were 472 and 223 m(2)g(-1), respectively. The adsorption data were fitted to a Langmuir isotherm model. The S(5)-PPH material was saturated by 120 mmol Hg(II) per 100g of material, whereas for Ni(II) adsorption, N(25)-PPH material displayed the highest adsorption with a saturation value of 43.5 mmol per 100g. These results suggest that functionalized PPH materials may be promising toxic metal scavengers and that they may provide an alternative environmental technology.
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain. jjimenez@uma.es
authors.forename: J
authors.initials: J
authors.lastname: Jiménez-Jiménez
authors.forename: M
authors.initials: M
authors.lastname: Algarra
authors.forename: E
authors.initials: E
authors.lastname: Rodríguez-Castellón
authors.forename: A
authors.initials: A
authors.lastname: Jiménez-López
authors.forename: J C G Esteves
authors.initials: JC
authors.lastname: da Silva
mesh_terms: D000327:Adsorption; D007220:Industrial Waste; D008628:Mercury / Q000302:isolation & purification*; D009532:Nickel / Q000302:isolation & purification*; D010710:Phosphates / Q000737:chemistry*; D016062:Porosity; D012722:Sewage / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
chemical_list: D007220:Industrial Waste; D010710:Phosphates; D012722:Sewage; D009532:Nickel; D008628:Mercury