Metal silicate nanotubes with nanostructured walls as superb adsorbents for uranyl ions and lead ions in water

Abstract

Silica nanotubes with mesoporous walls of 30 nm thickness were used as morphology templates, as well as the silicon source, to produce various metal silicate nanotubes with nanostructured walls, including magnesium silicate, copper silicate, nickel silicate, cobalt silicate and manganese silicate. These silicate materials retained the tubular structure of the templates, which resulted in large surface areas as high as 649 m 2 g À1 , large total volumes as high as 1.433 cm 3 g À1 and facile mass transportation on their surfaces. These features enabled them to be superb adsorbents for adsorption in water; in particular, magnesium silicates showed maximum adsorption capabilities of 929 mg g À1 for uranyl ions and 424 mg g À1 for lead ions, respectively. In practical usage, magnesium silicates could effectively adsorb uranium directly from the salt lake water, with a practical adsorption capacity of 0.23 mg g À1 , and was able to enrich the uranium concentration by 8 times.

A novel benzimidazole-functionalized 2-D COF material: Synthesis and application as a selective solid-phase extractant for separation of uranium

“…A solid phase extractant usually consists of two parts, the solid phase matrix and the functional component. Commonly used solid-phase matrixes mainly include Al 2 O 3 [17], silica [18], diatomaceous earth [19], polymer resin [20], and carbonaceous materials [21]. Although these materials have their own advantages, there are still more or less inevitable shortcomings on them in practical application, such as nonresistant of acid and radiation, unsuitable for use in high temperature environment and less surface area.…”

Single step modification of micrometer‐sized polystyrene particles by electromagnetic polyaniline and sorption of chromium(VI) metal ions from water

“…Heavy metal ions discharged into water bodies are nondegradable and tend to accumulate in the food chain and thus create serious environmental problems . Therefore, the effective removal of heavy metal ions from wastewater is important from the view point of safe environment perspective.…”

Hollow Manganese Silicate Nanotubes with Tunable Secondary Nanostructures as Excellent Fenton‐Type Catalysts for Dye Decomposition at Ambient Temperature

“…For example, hierarchical β‐Mo 2 C nanotubes constructed from porous nanosheets exhibited an impressive electrocatalytic performance for hydrogen evolution reaction . Our previous work also demonstrated the advantage of mesoporous tubular structures without end caps . Magnesium silicate nanotubes with nanostructured walls exhibited excellent removal capacities for UO 2 2+ , Pb 2+ , rhodamine B (RhB), and methylene blue (MB) than hollow spheres.…”