Abstract
A novel adsorbent based nanostructured bismuth oxyiodide (BiOI) microspheres combining the highly effective adsorption and green photocatalytic regeneration were fabricated by a facile and rapid low-temperature chemical bath method. The resultant products were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Nitrogen adsorption-desorption measurements, and UV-Vis diffuse reflectance spectroscopy (DRS). The BiOI microspheres displayed remarkable performance towards removal of Rhodamine B (RhB) and Cr (VI) from aqueous solution, showing a maximum adsorption capacity reached up to 40.78 mg g-1 and 38.01 mg g-1, respectively. The kinetics and equilibrium of adsorption process were found to follow the pseudo-second-order kinetic and Langmuir isotherm models. Notably, the BiOI microspheres have excellent photocatalytic regeneration capability due to their intrinsically prominent photoresponse in visible light region. By meaning of providing a new insight into the design of new generation adsorbent that could combine adsorption and solar-driven photocatalysis, the synthesized BiOI microspheres are very promising for the large-scale industrial application for water treatment.
Highlights
Water quality of global water resources is deteriorating continuously with the development of the industrialization, agriculturalizing as well as civilization activities[1]
The diffraction peaks situated at 29.5o, 31.7o, 33.3o, 37.1o, 45.4o, 51.1o, 55.3o and 66.4o are observed, which are due to the bismuth oxyiodide (BiOI) (012), (110), (111), (013), (014), (114), (122) and (220) lattice planes, respectively, which indicating the sample is the pure the tetragonal phase of BiOI (JCPDS file No 73-2062)
The results show that the adsorption kinetics of Rhodamine B (RhB) on the BiOI microspheres obeys the pseudo-second-order kinetic model
Summary
Water quality of global water resources is deteriorating continuously with the development of the industrialization, agriculturalizing as well as civilization activities[1]. In order to use solar energy efficiency and suit for large-scale industrial applications, many efficient combination adsorption-photocatalysts have been investigated and successfully designed, such as BiOBr/Co-Ni-NO3 layered double hydroxide nanocomposite[12], BiOI/rectorite[13], G-Fe2O3/SiO2-NH214, g-C3N4/ZnO15, BiOBr-PVP16, ZIF-8/ Zn2GeO417, et al Recently, new generation adsorbents, single three-dimensional (3D) porous micro/nanoarchitectures, have received increasing interest in environmental remediation[18,19,20,21,22], which have shown promise for removal of the toxic contaminants from water. BiOXs have been explored as a novel adsorbent to remove toxic metal ions and organic pollutants from water[18,19] The aim of this investigation was to provide a new insight into the design of new generation adsorbent that could combine adsorption and solar-driven photocatalysis to meet largescale industrial application for water treatment. The structure, adsorption and regeneration properties of hierarchical porous BiOI architectures were systematically investigated to evaluate the desirability of their application in water treatment
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
