Chemically modified rice husk as an effective adsorbent for removal of palladium ions

Abstract

Bio-matrix of rice husk and Mobil Composition of Matter No. 41 (MCM-41) was modified with alizarin red S for preconcentration of Pd 2+ prior flame atomic absorption spectrometric determination. The prepared bio-matrix (RH@MCM-41@ARS) was characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope, energy dispersive X-ray spectrometer (SEM/EDX) and surface area studies. The impact of different parameters (solution pH, amount of sorbent, contact time, sample volume, initial Pd 2+ concentration and diverse ions) on the uptake of Pd 2+ were evaluated. The maximum adsorption capacity of Pd 2+ onto RH@MCM-41@ARS was 198.2 mg g −1 at optimum conditions. Applying the optimized procedure as a preconcentration step led to limit of detection of 0.13 μg L −1 and dynamic analytical range up to 500 μg L −1 . The sorbent was regenerated by 0.5 mol L −1 thiourea for at least 10 cycles without significant reduction of adsorption capacity. The method was applied for preconcentration of Pd 2+ from real samples.

Zirconium‐2‐Imidazolidinethione Functionalized Reduced Graphene Oxide Aerogel for Efficient Removal of Fluoride Ions and Anionic Dyes from Aqueous Solutions: Multivariate Process Optimization

“…[ 34 ] In Zr‐IMDT/rGOAEY, peaks at 1566.64 and 646.95 cm −1 can be associated with C═C, and C─Br stretching vibrations indicating the successful sorption of the EY molecules. [ 35 ]…”

“…[34] In Zr-IMDT/rGOAEY, peaks at 1566.64 and 646.95 cm −1 can be associated with C═C, and C─Br stretching vibrations indicating the successful sorption of the EY molecules. [35] The formation of Zr-IMDT/rGOH was tested through the "tube inversion method" as shown in Due to the relatively low peak intensity of the rGO at around 25°and overlapping with the ligand, the Zr-IMDT/rGOA only exhibits the representative characteristic peaks of IMDT. This also concludes the successful incorporation of the ligand on the surface of GO.…”

Fabrication of a novel palladium membrane sensor for its determination in environmental and biological samples

“…5 Certain palladium compounds have been described as a potential threat to people, causing asthma, allergies, rhino conjunctivitis, and other major health problems, and are easily transmitted to biological material and eventually amplied along the food chain. 6,7 Palladium salts have been proven to be highly toxic to aquatic plants even at low concentrations. 8 According to a World Health Organization report, 9 data on Pd 2+ losses from automobile exhaust emission control catalysts is currently sparse.…”

Cetyl Trimethyl Ammonium Bromide (CTAB) functionalized sodium silicate for Naphtol Green B and Congo Red adsorption.

“…The presence of silanols' functions confers the adsorption properties for the rice husk [15,16], inducing the adsorption of cationic and anionic dyes [17]. Rice hulls attract attention because they are good adsorbents and offer many possibilities for modi cation and functionalization [18,19].…”