Platinum uptake from chloride solutions using biosorbents

Abstract

Present work investigates platinum uptake from synthetically prepared, dilute platinum-bearing solutions using biomass residues, i.e. pistachio nut shell and rice husk, which are abundant in Turkey, and provides a comparison between these two biosorbents. Effects of the different uptake parameters, sorbent dosage, contact time, temperature and pH of solution on platinum uptake (%) were studied in detail on a batch sorption. Before the pistachio nut shell was activated, platinum uptake (%) was poor compared to the rice husk. However, after the pistachio nut shell was activated at 1000 °C under an argon atmosphere, the platinum uptake (%) increased two-fold. The pistachio nut shell (original and activated) and rice husk were shown to be better than commercially available activated carbon in terms of adsorption capacity. These two sorbents have also been characterized by FTIR and SEM. Adsorption equilibrium data best complied with the Langmuir isotherm model. Maximum adsorption capacities, Q max , at 25 °C were found to be 38.31 and 42.02 mg.g -1 for the activated pistachio nut shell and rice husk, respectively. Thermodynamic calculations using the measured ∆H°, ∆S° and ∆G° values indicate that the uptake process was spontaneous and endothermic. The experimental data were shown to be fit the pseudo-second-order kinetic model.

Investigation of adsorption parameters for platinum and palladium onto a modified polyacrylonitrile-based sorbent

“…Several appropriate technologies are available including precipitation (Safdar et al, 2011), solvent extraction (Hung et al, 2007;Shamsipur et al, 2009), membrane filtration (Borbély and Nagy, 2009;Trivunac and Stevanovic, 2006;Xiang Li et al, 2013), cementation (Aktas, 2011(Aktas, , 2012Morcali et al, 2013c), ion exchange (Godlewska-Żylkiewicz et al, 2000;Shen et al, 2010Shen et al, , 2011 and adsorption (Fırlak et al, 2013;Kyzas et al, 2013;Wang et al, 2011). Comparatively, adsorption seems to be the most suitable as large volumes of very dilute wastes can be treated economically and nearly no waste residue is produced (Morcali et al, 2013a). A number of adsorbents have been developed and tested for the recovery of precious metals such as activated carbon (Aktas and Morcali, 2011b;Navarro et al, 2006), membranes (Xiang Li et al, 2013), and chelating resins (Atia et al, 2005;Birinci et al, 2009;Shen et al, 2011).…”

Synthesis and Adsorption Application of In Situ Photo-Cross-Linked Electrospun Poly(Vinyl Alcohol)-Based Nanofiber Membranes

“…The results showed that PVA/MA/ ATM NFm was very effective for the removal of Pt (IV) and Pd(II) from waste solutions, and the maximum adsorption capacity (Q max ) of PVA/MA/ATM NFm was comparable to those of other adsorbents presented in scientific literature (Fujiwara et al 2007;Peng et al 2009;Kavaklı et al 2006;Lin and Lien 2013;Birinci et al 2009;Fayemi et al 2013;Morcali et al 2013b;Morcali et al 2013b;Morcali et al 2013c). Maximum adsorption capacity was obtained at lower pH values, and this becomes an advantage, due to the fact that sorbents have no or low affinity for metals, particularly in strong acidic solutions.…”

“…make chloro complexes in a lower pH. However, the solution pH was increased up to 1.5 to easily catch the metal ions in the complex form (Aktas and Morcali 2011b; Morcali et al 2013c;Morcali et al 2014b).…”

The Mechanism of Redox Reaction between Palladium(II) Complex Ions and Potassium Formate in Acidic Aqueous Solution

“…Palladium can be recovered from aqueous system using several different methods, amount of them electrochemical [2][3][4], chemical [5], adsorption and/or ionic exchange [6,7].…”