Contact
    Start Publications Dye recovery with photoresponsive citric acid-modified BiOCOOH ...
    ←  Publication Finder
    Attension

    Dye recovery with photoresponsive citric acid-modified BiOCOOH smart material: Simple synthesis, adsorption-desorption properties, and mechanisms

    Year: 2022

    Journal: Environ. Res., Volume 214, NOV

    Authors: Wang, Bingjie; Peng, Jianbiao; Cao, Zhiguo; Zhang, Yakun; Ding, Li; Cao, Xin; Chang, Yu; Liu, Haijin

    Organizations: National Natural Science Foundation of China [42122057, 41977308]; Central Plain Talent Program of Henan Province [ZYYCYU202012168]; Natural Science Foundation of Henan Province [222300420205]; University Science and Technology Innovation Talent Support Program of Henan Province [20HASTIT011]

    Keywords: Photoresponsive; Photodesorption; BiOCOOH; Dye recovery; Smart material

    Dye recovery is of great significance for a circular economy and sustainable development. However, green recovery strategies without secondary pollution remain a significant challenge. To resolve this issue, a lightresponsive smart material (citric acid-modified BiOCOOH (m-BOCH)) was synthesized and applied for dye recovery through adsorption in the dark, and desorption under visible light. With the modification of citric acid, the adsorption level of methylene blue (MB) on m-BOCH (43.4%) was more than six times that of pure BiOCOOH (7.1%). The desorption rate was -90% in 120 min under 420 nm light irradiation (there was no desorption for pure BOCH). Further, the adsorption rate was improved to 83.9% and the desorption rate remained stable at an optimal pH of 10.09. Characterization results indicated that carboxyl groups were modified onto the surface of BiOCOOH and served as adsorption sites for MB. Under visible light exposure, the connections between the carboxyl groups and BiOCOOH were damaged, which led to the desorption of MB from the surface of the mBOCH. The recovered MB exhibited a good staining effect on hepatic stellate cells (HSC) as a fresh dye. The regeneration of m-BOCH was achieved through a moderate hydrothermal process, and the adsorption and desorption capacities were restored to 80.8% and 85.7%, respectively. This research provides a novel environmentally compatible strategy for dye recovery without secondary pollution. This is a very promising treatment technique for dye effluents, which highlights the application of smart materials resource recycling for environmental remediation.
    View publication