Abstract:Layered
double-oxide/biochar composites (ZnAl-LDO@BB) were successfully
prepared by a hydrothermal method and are used to adsorb different
pollutants. High-resolution transmission electron microscopy, scanning
electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction,
and Fourier-transform infrared spectroscopy were used to characterize
the ZnAl-LDO@BB. The synthesized ZnAl-LDO@BB were regular microspheres,
and ZnAl nanosheets were regularly embedded on the surface of the
banana biochar. The ads… Show more
“…4 b, revealed several peaks. For GO-SA a broad peak at around 1100–1200 cm −1 was associated with the Si–O–Si stretching vibration of the silica network, while a peak at around 800–900 cm −1 was associated with the bending vibration of Si–O–Si 63 , 64 . Figure 4 ( a ) XRD Diffractogram of GO-SA, GO, and modified silica aerogel showing the amorphous nature of aerogel, ( b ) FTIR transmittance spectra for GO-SA, GO, and modified silica, ( c ) BET, N 2 adsorption and desorption isotherm and BJH plot.…”
Emerging pollutants and a large volume of unused dyes from the textile industry have been contaminating water bodies. This work introduces a scalable approach to purifying water by the adsorption of Acid green 25 (AG), Crystal Violet (CV), and Sulfamethoxazole (SMA) from an aqueous solution by graphene oxide (GO) doped modified silica aerogel (GO-SA) with supercritical fluid deposition (SFD) method. Characterization of GO-SA using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), high-resolution scanning electron microscopy (HR-SEM), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) adsorption isotherms revealed the improvement in the adsorbent surface area, and its textural properties. The high removal percentages observed in most of the experimental runs provide evidence of the excellent performance of the adsorbent towards the anionic and cationic dyes along with the antibiotic. The adsorption isotherm and kinetics showed that the Langmuir isotherm and pseudo-second-order kinetic models could explain adsorption. The adsorbent holds a higher adsorption capacity for SMA (67.07 mg g−1) than for CV (41.46 mg g−1) and AG (20.56 mg g−1) due to the higher hydrophobicity that interacts with the hydrophobic adsorbent. The GO-SA successfully removed AG, CV, and SMA with removal percentages of 98.23%, 98.71%, and 94.46%, respectively. The parameters were optimized using Central Composite Design (RSM-CCD). The prepared aerogel showed excellent reusability with a removal efficiency of > 85% even after 5 cycles. This study shows the potential of GO-SA adsorbent in textile and other wastewater purification.
“…4 b, revealed several peaks. For GO-SA a broad peak at around 1100–1200 cm −1 was associated with the Si–O–Si stretching vibration of the silica network, while a peak at around 800–900 cm −1 was associated with the bending vibration of Si–O–Si 63 , 64 . Figure 4 ( a ) XRD Diffractogram of GO-SA, GO, and modified silica aerogel showing the amorphous nature of aerogel, ( b ) FTIR transmittance spectra for GO-SA, GO, and modified silica, ( c ) BET, N 2 adsorption and desorption isotherm and BJH plot.…”
Emerging pollutants and a large volume of unused dyes from the textile industry have been contaminating water bodies. This work introduces a scalable approach to purifying water by the adsorption of Acid green 25 (AG), Crystal Violet (CV), and Sulfamethoxazole (SMA) from an aqueous solution by graphene oxide (GO) doped modified silica aerogel (GO-SA) with supercritical fluid deposition (SFD) method. Characterization of GO-SA using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), high-resolution scanning electron microscopy (HR-SEM), thermogravimetric analysis (TGA), and Brunauer–Emmett–Teller (BET) adsorption isotherms revealed the improvement in the adsorbent surface area, and its textural properties. The high removal percentages observed in most of the experimental runs provide evidence of the excellent performance of the adsorbent towards the anionic and cationic dyes along with the antibiotic. The adsorption isotherm and kinetics showed that the Langmuir isotherm and pseudo-second-order kinetic models could explain adsorption. The adsorbent holds a higher adsorption capacity for SMA (67.07 mg g−1) than for CV (41.46 mg g−1) and AG (20.56 mg g−1) due to the higher hydrophobicity that interacts with the hydrophobic adsorbent. The GO-SA successfully removed AG, CV, and SMA with removal percentages of 98.23%, 98.71%, and 94.46%, respectively. The parameters were optimized using Central Composite Design (RSM-CCD). The prepared aerogel showed excellent reusability with a removal efficiency of > 85% even after 5 cycles. This study shows the potential of GO-SA adsorbent in textile and other wastewater purification.
“…Adsorption was a common separation method for complex systems, which was often used to remove toxic and harmful pollutants in sewage [26] . It had the advantages of simple operation, lower cost, safety and efficiency.…”
Section: Introductionmentioning
confidence: 99%
“…[24,25] Adsorption was a common separation method for complex systems, which was often used to remove toxic and harmful pollutants in sewage. [26] It had the advantages of simple operation, lower cost, safety and efficiency. At present, pollution control technology had become an important factor affecting economic and social development, and the adsorption treatment technology of the organic dyes had been widely concerned.…”
In this paper, a kind of Fe3O4 magnetic nano material modified by fulvic acid (FA) was prepared and used for removing methylene blue in wastewater. The structure and morphology of the material were characterized by FT‐IR, PXRD, BET, XPS, VSM, SEM and TEM. The results showed that FA successfully coated on the surface of Fe3O4 magnetic nano particles. The newly prepared magnetic material had large specific surface area and porous structure. The specific surface area of the material was 92.15 m2/g. The average pore size of the material was 8.917 nm. Its saturation magnetization could reach to 55.74 emu/g. The magnetic responsiveness of the material was obvious. The magnetic material could be recovered by the magnet so it was easy to separate with the solution. The adsorption kinetic data fitted better with pseudo second order kinetic equation. The isothermal adsorption processes of the modified material to methylene blue had better linear correlation with Langmuir isothermal adsorption model. The thermodynamic parameter results indicated that the adsorption processes of the material to methylene blue were spontaneous exothermic processes. The results of the cyclic experiments indicated that the material had a certain value for reuse.
“…Methylene blue (MB) is widely applied in the fields of chemical reagents, biological dyes, drugs, etc 1‐3 . However, a large amount of organic dye wastewater generated in printing and dyeing processes brings huge environmental risks 4,5 . Therefore, the realization of high‐efficiency purification treatment of printing and dyeing wastewater has been a focus of study of researchers.…”
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