Preparation and Adsorption Properties of Soybean Dreg/Hydrocalumite Composites

The application of biomass-based composites in the field of adsorption has attracted extensive attention. Herein, soybean dreg/hydro-calumite composites were prepared by in situ self-assembly from soybean dregs and applied to the adsorption of Congo Red (CR). The composites were characterized by scanning electron microscopy, X-ray diffraction, Fourier infrared spectroscopy, and N-2 physical adsorption-desorption. The results showed that the adsorption property of soybean dregs/hydrocalumite for CR was better than that of soybean dregs or hydrocalumite. Effects of preparation and adsorption conditions on the adsorption of CR by soybean dregs/hydrocalumite were also investigated. The removal rate of soybean dregs/hydrocalumite (30%BD-LDH) prepared under the optimized conditions reached 97.4% with a 486.8 mg.g(-1) adsorption capacity. Also, the adsorption capacity of 30%BD-LDH was about 2.4 times and 3.0 times that of hydrocalumite and soybean dregs, respectively. In addition, the adsorption process of CR by 30%BD-LDH was more in line with the pseudo-second-order kinetic and Langmuir isothermal models.

Automated summary

The study prepared soybean dreg/hydro-calumite composites for the adsorption of Congo Red, showing better adsorption performance compared to individual soybean dregs or hydrocalumite. The optimized 30%BD-LDH composite achieved a removal rate of 97.4% with an adsorption capacity of 486.8 mg.g(-1), which was significantly higher than that of hydrocalumite and soybean dregs. Additionally, the adsorption process of CR by 30%BD-LDH followed pseudo-second-order kinetic and Langmuir isothermal models.