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.
A novel coronavirus (SARS-CoV-2) causing corona virus disease 2019 (COVID-19) has
attracted global attention due to its highly infectious and pathogenic properties. Most
of current studies focus on aerosols released from infected individuals, but the
presence of SARS-CoV-2 in wastewater also should be examined. In this review, we used
bibliometrics to statistically evaluate the importance of water-related issues in the
context of COVID-19. The results show that the levels and transmission possibilities of
SARS-CoV-2 in wastewater are the main concerns, followed by potential secondary
pollution by the intensive use of disinfectants, sludge disposal, and the personal
safety of workers. The presence of SARS-CoV-2 in wastewater requires more attention
during the COVID-19 pandemic. Thus, the most effective techniques, i.e.,
wastewater-based epidemiology and quantitative microbial risk assessment, for virus
surveillance in wastewater are systematically analyzed. We further explicitly review and
analyze the successful operation of a sewage treatment plant in Huoshenshan Hospital in
China as an example and reference for other sewage treatment systems to properly ensure
discharge safety and tackle the COVID-19 pandemic. This review offers deeper insight
into the prevention and control of SARS-CoV-2 and similar viruses in the post-COVID-19
era from a wastewater perspective.
Calcined Ca−Al hydrotalcites were prepared by the clean method (Ca-LDO-1) and traditional co-precipitation method (Ca-LDO-2), respectively. The effect of the preparation method on the adsorption of glyphosate by calcined Ca−Al hydrotalcites was investigated. The adsorbents were also characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), and low-temperature N 2 adsorption− desorption, respectively. Compared with Ca-LDO-2, Ca-LDO-1 had higher specific surface area and pore volume, which caused it to show better adsorption performance and reusability for the adsorbing of glyphosate. In addition, the kinetics and thermodynamics of the adsorption of glyphosate by Ca-LDO-1 were studied. The results showed that it was more consistent with the pseudo-secondorder kinetic equation and Langmuir isotherm equation.
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