Plasma-induced grafting of acrylic acid on bentonite for the removal of U(VI) from aqueous solution

Abstract

Fabrication of reusable adsorbents with satisfactory adsorption capacity and using environmentfriendly preparation processes is required for the environment-related applications. In this study, acrylic acid (AA) was grafted onto bentonite (BT) to generate an AA-graft-BT (AA-g-BT) composite using a plasma-induced grafting technique considered to be an environment-friendly method. The as-prepared composite was characterized by scanning electron microscopy, x-ray powder diffraction, thermal gravity analysis, Fourier transform infrared spectroscopy and Barrett-Emmett-Teller analysis, demonstrating the successful grafting of AA onto BT. In addition, the removal of uranium(VI) (U(VI)) from contaminated aqueous solutions was examined using the as-prepared composite. The influencing factors, including contact time, pH value, ionic strength, temperature, and initial concentration, for the removal of U(VI) were investigated by batch experiments. The experimental process fitted best with the pseudo-secondorder kinetic and the Langmuir models. Moreover, thermodynamic investigation revealed a spontaneous and endothermic process. Compared with previous adsorbents, AA-g-BT has potential practical applications in treating U(VI)-contaminated solutions.

Biochar Derived from Sawdust Embedded with Molybdenum Disulfide for Highly Selective Removal of Pb2+

“…The correlation coefficient ( R 2 ), residual sum of squares ( RSS ), and chi-squared distribution (χ 2 ) calculated by Langmuir model were better than that by Freundlich, implying the Langmuir model was available to describe the adsorption of MoS 2 @biochar. Furthermore, the Pb 2+ may interact with the uniform binding sites on the MoS 2 @biochar surface . The maximum adsorption capabilities of Pb 2+ on MoS 2 @biochar were 177, 189, and 204 mg/g at 15, 25, and 35 °C, respectively.…”

Technologies to Manage Used Automotive Oil Filters in Iran: A Review Study

“…The plasma technology has been used to induce a graft of acrylic acid on bentonite to enhance the performance of adsorbents in aqueous ambient. The appearance of a proper efficiency proved the promotion in adsorbent performance via thermodynamic investigations [55].…”

Preparation of super-hydrophilic polyphenylsulfone nanofiber membranes for water treatment

“…Plasma treatment has been utilized as a promising method for surface modication of many materials, such as polymers, [40][41][42][43] carbon materials, [44][45][46] magnetic materials 47 and other naturalbased materials. 48 The results of the plasma treatments can be tailored by changing the gas phase. 44 Oxygen plasma treatment was found to be an effective tool to modify surface wettability.…”