Adsorption of Uranium(VI) from a Simulated Saline Solution by Alkali-Activated Leather Waste

Abstract

A porous adsorbent was prepared from leather waste by activation with alkali. The adsorbent, alkali-activated leather waste (AALW), was applied to adsorb uranium­(VI) and characterized by scanning electron microscopy, energy-dispersive X-ray detection, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The influence of the pH, initial uranium­(VI) concentration, temperature, and contact time on the adsorption of uranium­(VI) was systematically investigated. The adsorption of uranium­(VI) on AALW obeyed the Langmuir isotherm model and was attributed to ion exchange and complexation coordination. Thermodynamic and kinetic studies showed that the adsorption process was spontaneous and endothermic, and it reached adsorption equilibrium in 360 min. Moreover, the selective adsorption of uranium­(VI) from an aqueous solution containing coexisting ions and adsorption of trace uranium­(VI) from a simulated high-salinity environment showed that AALW had not only a strong affinity but a high selectivity for uranium­(VI).

Selective adsorption of uranium from salt lake‐simulated solution by phenolic‐functionalized hollow sponge‐like adsorbent

“…The raw material, chrome‐tanned cowhide, was hydrolyzed to prepare alkali‐activated leather waste (AALW) according to the approach described in the literature . Then, AALW particles were immersed in a 50 mL Teflon‐lined stainless steel autoclave with 20 mL of tannin solution, which was then sealed and hydrothermally heated in an oven.…”

“…The raw material, chrome-tanned cowhide, was hydrolyzed to prepare alkali-activated leather waste (AALW) according to the approach described in the literature. 25 Then, AALW particles were immersed in a 50 mL Teflon-lined stainless steel autoclave with 20 mL of tannin solution, which was then sealed and hydrothermally heated in an oven. The preparation conditions of HSLW were optimized including the mass fraction (w/v) of tannin solution (1, 2, 3, 4%), the dose of AALW (0.25, 0.5, 0.75, 1.0, 1.25, 1.5 g), the hydrothermal temperature (100, 120, 140, 160 ∘ C) and the hydrothermal time (0.5, 1.0, 1.5, 2.0, 4.0 h).…”

Research progress on resource utilization of leather solid waste

“…Recycling usage of chrome-containing leather waste as adsorbent for removal organic and inorganic pollutants has been proved to be a feasible method, which have successfully applied to adsorb As(V) [81], Cr (VI) [82,83], Cr (III) [84], U (VI) [85], Pb (II) [86], tannis [87] and organic dyes [88]. For instance, to obtain high adsorption capacity, Luo's group [85,86] activated chrome-tanned leather waste by NaOH to prepare alkali-activated porous leather particles and applied to adsorb U (VI) and Pb (II). To investigate the application in industrial tannery wastewater treatment, Piccin's group [89,90] employed chrome-tanned leather shaving waste as adsorbent to remove Acid Red 357 in dyeing wastewater from pilot-scale processing of leather.…”

Linear β-Cyclodextrin Polymer Functionalized Multiwalled Carbon Nanotubes as Nanoadsorbent for Highly Effective Removal of U(VI) from Aqueous Solution Based on Inner-Sphere Surface Complexation

“…The possible risk of the aquatic system being contaminated by uranium is a salient environmental concern because of its severe ramifications for human health. , Accordingly, the removal of uranium from aqueous solutions is of great importance toward environmental control and public health. An adsorption technique has been developed because of its conspicuous advantages of having lower cost, convenient operation, and extensive applicability in the disposal of various pollutants, − and it has been employed for removing uranyl ions in effluent water. − In the past decades, the rapid progress in nanotechnology provides intriguing new opportunities for developing nanomaterials. − Especially, prodigious efforts have been made to discover novel adsorption materials for the removal of uranyl ions in uranium-containing wastewater, such as carbon nanotubes (CNTs)/ multiwalled carbon nanotubes (MWCNTs), − mesoporous carbon, − metal–organic frameworks, − natural/synthetic polymers, − leather waste, tripolyphosphate LDH, titanate nanotubes, graphitic carbon nitride, biomass, and Fe 3 O 4 @PDA@TiO 2 . Among the various adsorbents, CNTs/MWCNTs have attracted considerable interest because of their good stability toward acid–base, excellent mechanical properties, large surface area, and higher thermal/radiation resistance. , However, the inherent hydrophobicity and easy aggregation of CNTs/MWCNTs in aqueous solution might impede their adsorption behaviors and decrease the removal efficiency of pollutants, consequently limiting their wide application in real work .…”