Biosorption properties of pretreated sporopollenin biomass for lead(II) and copper(II): Application of response surface methodology

WOS: 000338611100024The role of pretreated sporopollenin (PSp) biomass in M(II) (M = Pb, Cu) removal from aqueous solutions was investigated by batch biosorption technique. The chemical properties and morphology of the biosorbent were characterized by means of FT-IR and SEM-EDX techniques. Influence of various operating parameters like pH, contact time, biosorbent dose and initial concentration on biosorption process were optimized by using a quadratic model Box-Behnken design using response surface methodology. The results indicated that Pb(II) and Cu(II) sorption on PSp was strongly dependent on pH. The experimental equilibrium data was analyzed with three isotherm models and the sorption data was better fitted to Langmuir isotherm model, and the order of maximum biosorption capacity (q(max)) was Pb(II) (6.10 mg g(-1))> Cu(II) (4.84 mg g(-1)). FTIR and SEM-EDX was used to identify the biosorption mechanism and it was confirmed from SEM-EDX that metal ions were present in the PSp biomass after biosorption. These results are important for estimating and optimizing the removal of metal ions by PSp biomass. The results demonstrated that PSp was a economic and eco-friendly biosorbent possessed strong sorption characteristics for Pb(II) and Cu(II) ions.Scientific Research Project Unit (BAP) of Aksaray University [2010/10]The authors gratefully thank to Scientific Research Project Unit (BAP) of Aksaray University (2010/10) for the financial support of this work. We gratefully thank to Dr. Belgin Gozmen for SEM and EDX analysis

Fabrication of Stable and Regenerable Amine Functionalized Magnetic Nanoparticles as a Potential Material for Pt(IV) Recovery from Acidic Solutions

MnFe₂O₄@SiO₂–NH₂ magnetic nanocomposite (AFMNC) adsorbent with a particle size of ∼50 nm was successfully synthesized using a facile approach. The as-prepared composite particles showed a fast binding of Pt­(IV) with easy magnetic solid–liquid separation. The kinetic data were fitted to both pseudo-first and second-order rate models, indicating that AFMNC exhibited a much higher rate of Pt­(IV) binding (0.125 g mg^–1 min^–1) compared to that of commercial ion-exchange resin Amberjet 4200 (0.0002 g mg^–1 min^–1). The equilibrium adsorption data were fitted to the Langmuir isotherm model with a relatively high sorption capacity of 380 mg/g. Scanning transmission electron microscopy analysis demonstrated the presence of platinum chloride after sorption on AFMNC, suggesting an adsorbate–adsorbent anion-exchange interaction. In addition, due to its magnetic characteristics, AFMNC can be easily separated from the aqueous medium after the sorption process. The novel nanocomposite may facilitate recovery of Pt­(IV) from waste solutions

A promising route of magnetic based materials for removal of cadmium and methylene blue from waste water

Adsorption equilibrium is an essential measure to be controlled in attaining the maximum capacity of an adsorbent. Synthesis of magnetic biochar by using various discarded biomass possesses varied adsorbate adsorption capability. Maximising the removal percentage of the pollutant from wastewater by altering operational parameters are the very important skill to be mastered by environmentalist. In this research work, mangosteen peel derived ferric oxide magnetic biochar was pyrolysed at 800 °C for 20 min via modified muffle furnace at zero oxygen environment. The factors affecting adsorption were studied for two different liquid pollutant. A comparative study was carried out for adsorption of methylene blue dye and Cd (II) ions by altering the adsorbate pH, agitation speed, and contact time and particle diffusion mechanism were investigated respectively. The removal of methylene blue dye attained maximum removal at pH of 7.0 and above, 50 min contact time and 150 rpm agitation speed. Moreover, adsorption equilibrium of Cd (II) ions reaches maximum removal percentage at the pH value of 8.0, agitation speed of 150 rpm and 60 min contact time. The thermodynamics study was performed to further understand the effect of operating temperature in determining the adsorption spontaneous of adsorption medium. The experimental analysis reveals that the produced magnetic biochar is viable for adsorption of both heavy metal ions and organic pollutant at optimised condition