Improving Re(VII) Adsorption on Diisobutylamine-Functionalized Graphene Oxide

Abstract

In this study, we synthesized a series of diisobutylamine-functionalized graphene oxides as adsorbents (GO-DEA-DIBA) by adjusting synthetic conditions for the efficient adsorption of rhenium­(VII) (Re­(VII)). Results indicated that the best mass ratio was 10 mg of sodium carbonate to 5 g of distilled water, and a cooling time of 44 min could prevent the exfoliation of functional groups and achieve higher uptake capacity of Re­(VII). The maximum uptake of Re­(VII) was found to be 140.82 mg g–1 at 303 K with an initial Re­(VII) concentration of 800 mg L–1. More importantly, it can be clearly seen that mixed ions (Cu2+, Zn2+, and Mn2+) could almost separate with Re­(VII) on the adsorption of ReO4 – onto the GO-DEA-DIBA with a weak acidity solution. Re­(VII) was adsorbed on the GO-DEA-DIBA via charge interactions between tertiary amine groups and ReO4 – by infrared spectroscopy and X-ray photoelectron spectroscopy analysis. In addition, adsorption behavior, adsorption isotherms, desorption, and regeneration are also discussed. This study not only discusses the thermodynamic stability of functional graphene oxide but also provides a new method for the separation of Re­(VII) from solution using GO-DEA-DIBA owing to its environmental friendliness and relatively low cost.

Quaternary Phosphonium Modified Hierarchically Macro/Mesoporous Silica for Fast Removal of Perrhenate

“…Re is one of the rare dispersed elements, and its alloys have been widely used in petrochemical industry, aviation, and so on. So it is environmentally and economically important to recover Re from waste solution. , Several methods have been applied for the separation of TcO 4 – and ReO 4 – , such as solvent extraction, adsorption, and precipitation . Although extraction has the advantages of large extraction capacity and high separation efficiency, it suffers from slow kinetics and secondary waste which is difficult to handle and harmful to the environment due to the use of toxic extraction solvent.…”

Radiation Syntheses and Performance of Novel Hierarchically Macro-/Mesoporous Silica Adsorbents with Quaternary Phosphonium for the High Selective Removal of Perrhenate

“…It is very significant to develop Re/Tc adsorbents in the perspective of economy, recycling, and radioactive waste disposal. Some Re/Tc inorganic adsorbents have been reported, such as graphene oxide and modified Al 2 O 3 , but these adsorbents exhibit low adsorption capacity and poor selectivity. Some organic adsorbents have also been reported, such as anion-exchange resins and gels; however, their adsorption kinetics and selectivity are not good enough to meet the requirements.…”

Fast recovery of lead from hydrochloric acid via a novel silica-supported anion exchange resin for the determination of 210Pb in environmental samples

“…However, these resins suffer from poor adsorption kinetics [23][24][25], thus leading to a long separation time and low efficiency. More recently, scholars have developed novel anion exchangers for cationic metal-organic framework materials (MOF) [26][27][28], layered double-metal hydroxides materials (LDH) [29][30][31], inorganic cationic extended frameworks materials [32,33], and functionalized graphene oxide materials [34][35][36]. However, few works have investigated the separation and purification of lead in hydrochloric acid solution.…”