The
application of
biomass-based composites in the field of adsorption
has attracted extensive attention. Herein, soybean dreg/hydrocalumite
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 N2 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.
Bean dreg (BD)–hydrocalumite
composites were prepared by
a hydrothermal method with BD, Ca(OH)
2
, Al(OH)
3
, and Na
2
CO
3
as raw materials. The samples
were characterized by powder X-ray diffraction, scanning electron
microscopy, Fourier transform infrared spectroscopy, and N
2
physical adsorption–desorption. Their properties as a thermal
stabilizer for poly(vinyl chloride) were tested using a torque rheometer
and static thermal aging method. Compared with traditional hydrocalumite,
the crystal size of the BD–hydrocalumite composite was relatively
small, which made it exhibit good dispersion and better thermal stability
for poly(vinyl chloride). In addition, the effects of preparation
conditions on the properties of BD–hydrocalumite as a heat
stabilizer were also investigated. Under the conditions of
n
[Ca(OH)
2
/Al(OH)
3
/Na
2
CO
3
] = 4.4:2:1, a BD dosage of 5%, a crystallization temperature
of 90 °C, and 19 h, the prepared BD–hydrocalumite showed
the best performance, and the dynamic thermal stability time of poly(vinyl
chloride) reached 2149 s.
Glycerol carbonate, a value-added derivative of biomass glycerol, has been synthesized by the transesterification of dimethyl carbonate with glycerol using anhydrous sodium silicate (Na2SiO3) as highly efficient, green and available solid base catalyst. The yield of glycerol carbonate reached up to 93% in 10 minutes under microwave irradiation. The result of leaching test indicated Na2SiO3 was a well-defined heterogeneous catalyst for the reaction. In addition, Na2SiO3 could be reused in 4 runs without significant loss of its catalytic activity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.