Synthesis and applications of poly(acryl p -aminobenzenesulfonamideamidine- p -aminobenzenesulfonylamide) chelating fiber for pre-concentrating and separating trace Bi(III), Hg(III), Au(III) and Pd(IV) from solution samples

Abstract

Poly(acryl p-aminobenzenesulfonamideamidine- p-aminobenzenesulfonylamide) chelating fiber containing "S", "N", and "O" elements was synthesized from polyacrylonitrile fiber and p-aminobenzene sulfonamide and used to enrich and separate trace Bi(III), Hg(III), Au(III), and Pd(IV) ions from wastewater and ore sample solution. The enrichment acidity, flow rate, elution conditions, reuse, interference ions, saturated adsorption capacity, constant of adsorption rate, analytical accuracy, and actual samples on chelating fiber were investigated by means of inductively coupled plasma optical emission spectrometry (ICP-OES) with satisfactory results. Solutions of 100 ng mL(-1) of Bi(III), Hg(III), Au(III), and Pd(IV) ions can be enriched quantitatively by this chelating fiber at a rate of 1.0 mL min(-1) at pH 4 and desorbed quantitatively with 20 mL of 0.25 M HCl and 2% CS(NH(2))(2) solution at 50 degrees C (with recovery >/=97%). When the chelating fiber was reused for 20 times, the recoveries of the analyzed ions enriched by the fiber were still over 95% (except for Hg(III)). One thousand-fold excesses of Mn(2+), Ca(2+), Zn(2+), Mg(2+), Fe(3+), Cu(2+), Ni(2+), Al(3+), and Ba(2+) ions and thousands-fold excesses of Na(+ )and K(+) cause little interference in the pre-concentration and determination of the analyzed ions. The saturated adsorption capacity of Bi(III), Hg(III), Au(III), and Pd(IV) was 4.850 x 10(-4), 3.235 x 10(-4), 2.807 x 10(-4), and 3.386 x 10(-4) mol g(-1), respectively. The constants of adsorption rate were 0.409 min(-1) for Bi, 0.122 min(-1) for Hg, 0.039 min(-1) for Au, and 0.080 min(-1 )for Pd. The relative standard deviations (RSDs) for the enrichment and determination of 10 ng mL(-1) Bi(III), Hg(III), Au(III), and Pd(IV) were lower than 2.3%. The results obtained for these ions in actual samples by this method were basically in agreement with the given values with average errors of less than 1.0%. FT-IR spectra shows that the existence of -SO(2)-Ar, -H(2)N-Ar, O=C-NH-, HN=C-NH-, and -HN-SO(2) functional groups are verified in the chelating fiber. From the FT-IR spectroscopy, we can see that Hg(III), Au(III), and Pd(IV) are mainly combined with nitrogen and sulfur (or oxygen), and Bi(III) is mainly combined with nitrogen (or oxygen) of the groups to form a chelating complex.

Efficient Gold Recovery from E-Waste via a Chelate-Containing Porous Aromatic Framework

“…This result implied that the functional groups on PAF-1-thiourea participated in a redox reaction and reduced Au­(III) to Au­(I) and Au(0) during the Au­(III) adsorption process. Relevant studies have reported that N or S atoms can reduce metal ions. , Therefore, the N- and S-containing functional groups could reduce Au­(III) to Au­(I) and Au(0) while being chelated to Au­(III). Figure S10 shows the XRD pattern of PAF-1-thiourea after Au­(III) adsorption.…”

“…Relevant studies have reported that N or S atoms can reduce metal ions. 40,41 Therefore, the N-and S-containing functional groups could reduce Au(III) to Au(I) and Au(0) while being chelated to Au(III). Figure S10 shows the XRD pattern of PAF-1-thiourea after Au(III) adsorption.…”

Synthesis and Characteristics of Macroporous Epoxy Resin‐Triethylenetetramine Polymer Modified by Sodium Chloroacetate for Copper Chelation in Aqueous Solution

“…For example, Chang et al enriched and determined a series of trace rare elements in samples with synthesized chelating resins 18 and chelating fibers. 17 An efficient adsorbing material should consist of a stable and insoluble porous matrix, which has active groups (typically organic groups) that interact with heavy metal ions. Epoxy resin is an ideal matrix because it is inexpensive, stable under acidic conditions, displays high thermal resistance and its preparation process is simple and rapid.…”

Solid phase extraction of gold(III) on Amberlite XAD-2000 prior to its flame atomic absorption spectrometric determination

“…Chelex 100 (Koshima, 1986), modified silicas (Pu, Liu, Sun, & Sun, 2003;Pu, Su, Hu, Chang, & Yang, 1998), chitin (Terada & Kawamura, 1991), activated carbon (Chakrapani, Mahanta, Murty, & Gomathy, 2001;Soylak, Elci, & Dogan, 2000), microbeads (Kavakli, Ozvatan, Tuncel, & Salih, 2002), thiol cotton fiber (Yu et al, 2002), chelating fibers (Chang, Wang, & Zhao, 2003), c18 (Zhao et al, 2006), etc. have been successfully used as solid phase extraction materials for the preconcentration of gold.…”