Adsorption of inorganic ions from aqueous solutions using mineral sorbent - tripoli

Abstract

Abstract. The present research considers the adsorption of H2AsO4 -, CrO4 2-, Ni 2+ , Fe 3+ ions from their aqueous solutions by mineral sorbenttripoli. Tripoli was characterized by different physico-chemical methods such as X-ray phase analysis, inductively coupled plasma atomic emission spectrometry, method of thermal desorption of nitrogen. Contact time, specific surface area, specific pore volume and surface charge of tripoli have been determined. The effect of tripoli surface area modification by iron (III) oxide-hydroxide on tripoli sorption capacity for the arsenic anions has been investigated. The maximum adsorption was found to occur within 30 minutes of contact time. Different models including the pseudofirst-order kinetic and the pseudo-second-order kinetic equations were used to analyse kinetic data. All the models being considered, it has been stated that the pseudo-second-order kinetic model is the most appropriate to describe the adsorption behaviour of Fe 3+ ions on tripoli. The adsorption has been explained in terms of Langmuir and Freundlich isotherms. Based on values of correlation coefficients, H2AsO4 -, CrO4 2-, Ni 2+ , Fe 3+ sorption isotherm data were better fitted by Langmuir model. It has been detected that the modification of mineral sorbent (tripoli) leads to the increase in H2AsO4 -adsorbing capacity of tripoli. In general, the results indicated that tripoli can be an efficient low-cost sorbent for removing H2AsO4 -, Ni 2+ , Fe 3+ ions from aqueous solutions.

Electrothermal production of ferroalloy from tripoli

“…Therefore, silica in tripoli is mainly in an amorphous state, a characteristic feature of which is an increased reactivity in comparison with the crystal form [4]. Using this property of amorphous silica, in contrast to the known methods of its application [ [5], [6], [7], [8], [9], [10]], it was proposed to use tripol as a silicon-containing raw material to produce a siliceous ferroalloy [11] for the smelting of which quartzite is used [ [12], [13], [14], [15]]. The article presents the results of studies to determine the optimal parameters for the electrothermal production of silicon ferroalloy from tripoli.…”

Hydrophobic sorbents based on ultrathin polymer fibers for trapping oil products

“…Материалы, которые используются для удаления углеводородов из водных сред [7], должны обладать нефтеемкостью, гидрофобностью, влагостойкостью, плавучестью. В качестве сорбентов применяются различные органические, неорганические, искусственные и синтетические материалы [8][9][10][11][12]. Неорганические на минеральной основе сорбенты (глина, перлит и др.)…”