Developing sustainable graphene-doped titanium nano tube coated to superparamagnetic nanoparticles for arsenic recovery

- Reveal GN modified with MNP-TNT has higher arsenic removal reaction rate.
- Treatment efficiency of As(III) after 4 cycle significantly higher than literature.
- Explore new GN-MNP doping TNT associated materials for adsorption.

This first attempt study explored newly prepared materials for promising As(III) treatment with easily recycling characteristics for sustainable uses. Regarding layered GOs they had appropriate capabilities for practicability; significantly increased large GO layers could be served as precursor and stabilizer of other materials due to excellent electron transfer capacities. Titanium nano tube (TNT) catalysts were prepared to augment surface areas for maximal adsorption capacities. TNT-doped graphene (GN-TNT) was then prepared by hydrothermal method. In addition, GN-TNT was coated with magnetic nano particles (MNP) to yield mesoporous composites to be easily recycled under a magnet. Ternary mixture design of experiments was implemented to determine optimal ratios of GN-MNP-TNT to remove As(III) in solutions. To have detailed characteristics of the morphology and composition, X-ray diffraction, atomic force microscopy and transmission electron microscopy were implemented. Resuability of GN-MNP-TNT composites had also been tested for 4 serial cycles of adsorption/desorption of As(III). Compared to graphene-based materials, the most appropriate rate of As(III) adsorption rate was 0.057 min−1. In addition, treatment efficiency of As(III) after 4 cycle of regeneration still remained at 83%, significantly higher than literature for promising practicability.

Developing sustainable graphene-doped titanium nano tube coated to superparamagnetic nanoparticles for Arsenic recovery Yu-Jung Lin, Wen-Zhi Cao, Tong Ouyang, Bor-Yann Chen, Chang-Tang Chang In this review, experiments were conducted to investigate the oxidation of Arsenic in aqueous solution by graphene / magnetic nano particle/ titanium nanotube composite (GN/MNP/TNT) adsorption process. GN/MNP/TNT with an average inner diameter about 6 nm was synthesized using the hydrothermal method. Several conditions such as As(III) concentration, regeneration times, and content of GN in GN/MNP/TNT are discussed.128.