Fabrication of bismuth based MOF (SU-101) for adsorption and photocatalytic desorption toward Cr (Ⅵ).

[Display omitted] • Preparation of bismuth based MOF SU-101 by a simple solvothermal method. • SU-101 is a green and efficient MOF material with simple preparation, low production cost, green raw material source, and high water-stability. • SU-101 has excellent adsorption and photocatalytic properties for efficient removal of Cr (VI) • SU-101 can effectively avoid secondary pollution and realize green adsorption desorption cycle. • The mechanism between SU-101 and Cr (Ⅵ) is electrostatic interaction and hydrogen bonding. In recent years, the environmental problems caused by heavy metal pollution have become increasingly serious. Hexavalent chromium (Cr (VI)), as one of the most common heavy metal pollutants, has a serious effect on humans and the natural environment, which has aroused widespread concern among many scholars. In this paper, a green metal MOF SU-101 was prepared by solvothermal method, and the adsorption characteristics of SU-101 on Cr (VI) were investigated. SU-101 was simple to prepare, with a variety of eco-friendly raw materials and great water stability. The adsorption of Cr (VI) was a multimolecular layer, non-homogeneous chemical adsorption process, which was spontaneous, entropic and heat-absorbing. The mechanism between SU-101 and Cr (VI) was electrostatic interaction and hydrogen bonding. In addition, SU-101 also had significant photocatalytic performance, which was applied to the subsequent treatment of adsorbent desorption, effectively solving the problem of secondary pollution and achieving a green and sustainable adsorption desorption cycle. [ABSTRACT FROM AUTHOR]