In situ growth of ZnO nanorod arrays on cotton cloth for the removal of uranium(vi)

Abstract

In situ growth of ZnO nanorod arrays on cotton cloth (ZnO/CC) was proposed to remove uranium (VI) from aqueous solution. The as-prepared adsorbent is easy separation from the reaction medium after adsorption. The effect factors for uranium adsorption, such as solution pH, initial U (VI) concentration, contact time, and temperature have been systematically investigated. The maximum adsorption capacity of uranium (VI) which was calculated by the Langmuir model at pH=5.0 and T=298 K is 431.03 mg g -1 , exhibiting its excellent uranium adsorption properties. It was observed that the kinetic data fit well to the pseudo-second-order kinetic model indicating that the rate-limiting step of adsorption process is chemical adsorption. Moreover, thermodynamic parameters [ΔH 0 =20.26 kJ mol -1 ΔG 0 =-5.66 kJ mol -1 (298 K) ΔS 0 =86.98 J mol -1 K -1 ] reveal that the uranium adsorption is endothermic and spontaneous. Therefore, the ZnO/CC is a potential adsorbent for recovery of uranium (VI) from aqueous solution.

Efficient Removal of [UO2]2+, Cs+, and Sr2+ Ions by Radiation-Resistant Gallium Thioantimonates

“…The kinetic data were further analyzed with pseudo-second-order kinetics, which presume that chemical adsorption is the rate-determining step . It is expressed by eq .…”

“…The fitting results of the pseudo-second-order kinetic model are shown in Table S5. As we know, the pseudo-second-order kinetic model assumes that the rate-limiting step is chemical adsorption . This further demonstrates that the U removal by both compounds involves chemical adsorption.…”

“…The kinetic data were further analyzed with pseudo-secondorder kinetics, which presume that chemical adsorption is the rate-determining step. 26 It is expressed by eq 3. Here, q t and q e are the mass of a metal ion adsorbed per unit weight of adsorbent (mg•g −1 ) at time t and at equilibrium, respectively.…”

Hierarchical Ti3C2Tx MXene/Ni Chain/ZnO Array Hybrid Nanostructures on Cotton Fabric for Durable Self-Cleaning and Enhanced Microwave Absorption

“…36-1451). 42,43 The peaks at 2θ = 44.8 and 52.0°corresponding to the (111) and (200) planes can be assigned to face-centered cubic Ni (JCPDS no. 04-0850).…”

TiO2 Nanowire Arrays in situ Grown on Ti Foil Exhibiting Superior Uranyl-Adsorption Properties

“…To date, assorted types of adsorbents have been developed for uranium, such as activated carbon, oxides, graphene, nanocomposites, and polymers (Nair et al, 2014;Xu et al, 2015;Zhang et al, 2015;Wang et al, 2016;El-Maghrabi et al, 2017). Among these adsorbents, metal oxides, especially titanium dioxide, have attracted considerable attention because of its high adsorptive capacity for uranium (VI), good radiochemical stability, and negligible solubility in both acidic and alkaline solutions (Comarmond et al, 2011;Tatarchuk et al, 2019;Wang et al, 2019).…”