Novel Carbon Paper@Magnesium Silicate Composite Porous Films: Design, Fabrication, and Adsorption Behavior for Heavy Metal Ions in Aqueous Solution

Abstract

It is of great and increasing interest to explore porous adsorption films to reduce heavy metal ions in aqueous solution. Here, we for the first time fabricated carbon paper@magnesium silicate (CP@MS) composite films for the high-efficiency removal of Zn and Cu by a solid-phase transformation from hydromagnesite-coated CP (CP@MCH) precursor film in a hydrothermal route and detailedly examined adsorption process for Zn and Cu as well as the adsorption mechanism. The suitable initial pH range is beyond 4.0 for the adsorption of the CP@MS to remove Zn under the investigated conditions, and the adsorption capacity is mainly up to the pore size of the porous film. The composite film exhibits excellent adsorption capacity for both of Zn and Cu with the corresponding maximum adsorption quantity of 198.0 mg g for Zn and 113.5 mg g for Cu, which are advantageous over most of those reported in the literature. Furthermore, the adsorption behavior of the CP@MS film follows the pseudo-second-order kinetic model and the Langmuir adsorption equation for Zn with the cation-exchange mechanism. Particularly, the CP@MS film shows promising practical applications for the removal of heavy metal ions in water by an adsorption-filtration system.

Research on the Adsorption Behavior of Heavy Metal Ions by Porous Material Prepared with Silicate Tailings

“…Similarly, silicate tailings, as an eco-friendly material, were feasible for the removal of various harmful cations due to their wide specific surface area and high adsorption capacity. In recent years, it has been widely studied that natural silicates and modified silicates could be used as potential adsorbents to remove various heavy metal ions from aqueous solvents [17][18][19][20][21][22]. However, the silicate adsorbents that have been reported were powdered and granulated; these forms of adsorbents were difficult to separate from the solution, and secondary pollution arose easily [23][24][25].…”

Removal of Hg(ii) in aqueous solutions through physical and chemical adsorption principles

“…These materials are not only ultrathin but also possess stable chemical resistance, high recycling performance and excellent antifouling properties. [110][111][112]…”

Growth and Removal Behavior of Magnesium Oxide Microspheres towards Methyl Orange and Methylene Blue in Aqueous Solution

“…There are several pores of different volumes beyond 1 µm range in the MgO microsphere as marked inFigure 4D, and these results also agree with the observed from the morphology. These results suggest that the pores of different size from nanometer (average pore size 28.7 nm) to the micrometer (average pore size 220.0 nm) present in the flower-like MgO microsphere, which may provide a pathway to approach the internal surface area of MgO based on nature of pollutant[22][23][24].…”