Metallurgical recovery of metals from electronic waste: a review.

Adsorption of platinum (IV), palladium (II) and gold (III) from aqueous solutions onto l-lysine modified crosslinked chitosan resin

pH dependent Cu(II) and Pd(II) ions detection and removal from aqueous media by an efficient mesoporous adsorbent

In agricultural field, polymers are widely used for many applications. Although they were used, in the first time, just as structural materials (inhert polymers), in the last decades functionalized polymers revolutionized the agricultural and food industry with new tools for several applications. Smart polymeric materials and smart delivery systems helped the agricultural industry	to combat viruses and other crop pathogens, functionalized polymers were used to increase the efficiency of pesticides and herbicides, allowing lower doses to be used and to indirectly protect the environment through filters or catalysts to reduce pollution and clean-up existing pollutants. This report will review the key aspects of used polymers in agricultural area, highlighting current research in this field and the future impacts they may have.

/pdf/polymer-in-agriculture-a-review-1mn395finm.pdf

Polymer in Agriculture: a Review

Adsorption of platinum(IV) and palladium(II) from aqueous solution by thiourea-modified chitosan microspheres

New poly(N-(hydroxymethyl)methacrylamide-1-allyl-2-thiourea) hydrogels prepared by radiation-induced polymerisation : Selective adsorption, recovery and pre-concentration of Pt(II) and Pd(II)

Gold recovery onto poly(acrylamide-allylthiourea) hydrogels synthesized by treating with gamma radiation

Poly(p-chloromethylstyrene-divinylbenzene) polymeric microbeads, poly(p-CMS-DVB), were synthesized and 1,5,9,13-tetrathiacyclohexadecane-3,11-diol was attached chemically to the polymeric microbeads. Characterizations of all microbeads were carried out using FT-IR, TGA, DSC and an elemental analyzer. The amount of 1,5,9,13-tetrathiacyclohexadecane-3,11-diol attached to the polymer was found to be 2.76 mmol/g polymer. These microbeads were used for recovery, preconcentration and the selective adsorption of precious metal ions by changing the pH and the initial metal ion concentrations. Au(III), Ag(I), Pt(II) and Pd(II) from single and competitive solutions were recovered and preconcentrated. High levels of metal ion adsorption were found below pH = 2, even when the pH fell as low as pH = 0.5. Preconcentration factors for the precious metal ions studied were found to be more than 1000-fold and recovery was between 96% and 102%. Selectivity of the modified microbeads followed the order Au(III) > Ag(I) > Pd(II) > Pt(II). In the geological samples and in some samples from water-lands, the ultra-trace precious metal ion concentration was determined easily by using modified microbeads after preconcentration. For the desorption of the precious metal ions, HCl (3 M) containing thiourea (0.8 M) was used and desorption ratio obtained was more than 96%.

Selective adsorption and recovery of precious metal ions from geological samples by 1,5,9,13-tetrathiacyclohexadecane-3,11-diol anchored poly(p-CMS-DVB) microbeads

Chrysin, apigenin, flavonoids, flavanones, naringenin, ethyl oleate, 3-4-dimethoxy-cinnamic acid and 9-octadecenoic acid were the predominant components of propolis samples collected from different regions of Turkey. The extracts of P3 from Denizli-Baskarci, P5 from Denizli and P7 from Tekirdaĝ had effective antibacterial activities on Gram-negatives. Chrysin, which has antibacterial activity, was found to be high concentration. The extracts of P3, P2B from Aydin and P6 from Konya had much more effective antibacterial activities on Gram-positives. The total antioxidant activity increased with the increasing amount of extracts added to linoleic acid emulsion. All doses of propolis ethanol extract displayed antioxidant activity.

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Papers

New poly(N-(hydroxymethyl)methacrylamide-1-allyl-2-thiourea) hydrogels prepared by radiation-induced polymerisation : Selective adsorption, recovery and pre-concentration of Pt(II) and Pd(II)

Gold recovery onto poly(acrylamide-allylthiourea) hydrogels synthesized by treating with gamma radiation

Selective adsorption and recovery of precious metal ions from geological samples by 1,5,9,13-tetrathiacyclohexadecane-3,11-diol anchored poly(p-CMS-DVB) microbeads

Chemical composition effects onto antimicrobial and antioxidant activities of propolis collected from different regions of Turkey

Radiation synthesis and characterization of new hydrogels based on acrylamide copolymers cross-linked with 1-allyl-2-thiourea