Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior ofazo dyes in aqueous solution on DG0...Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior ofazo dyes in aqueous solution on DG06, GSE17200, and GSE17201 soils using C. I. Acid Red 14 （AR14） as example. The experimental results indicate that the Freundlich model expresses the adsorption isotherm better than the Langmuir model and the pseudo-second-order model achieves adsorption of AR14 on the three soils well. Based on the pseudo-second-order model, the adsorption thermodynamic of AR14 on DG06 soil have been studied and the thermodynamics parameter of AGO is determined and AGO value shows the adsorption process of AR14 on DG06 is mainly physical in nature. Furthermore, the effects of temperature, pH and salinity （NaC1） on adsorption have been investigated. The decrease in pH or the increase in salinity enhances the adsorption of AR14 by DG06, GSE17200, and GSE17201.展开更多
Fe-Ce-OH@AR14 was obtained via the adsorption of acid red 14(AR14) on Fe-Ce-OH prepared by the codeposition of cerium nitrate hexahydrate,ferric nitrate nonahydrate,and ammonia,and then Fe-Ce-O@C with high photocataly...Fe-Ce-OH@AR14 was obtained via the adsorption of acid red 14(AR14) on Fe-Ce-OH prepared by the codeposition of cerium nitrate hexahydrate,ferric nitrate nonahydrate,and ammonia,and then Fe-Ce-O@C with high photocatalyic efficiency was synthesized by the calcination of Fe-Ce-OH@AR14 in N_(2).For comparison,Fe-Ce-O was also prepared by the calcination of Fe-Ce-OH in N_(2).The obtained materials were characte rized by X-ray diffraction(XRD),Raman,X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FT-IR),scanning electron miscroscopy(SEM),photoluminescence(PL),ultraviolet-visible diffuse reflectance spectroscopy(UV-vis) techniques and the results show that the band gap of CeO_(2) can be greatly reduced by doping of Fe^(3+),and that loading carbon from the decomposition of AR14 can prolong carrier life,improve the intensity of visible light absorption,and enhance the concentration of oxygen vacancies.The photocatalytic results using AR14 as probe molecule illustrate that using 1% ferric nitrate nonahydrate(the mass percentage of ferric nitrate nonahydrate to cerium nitrate hexahydrate) as dopant and 25 mL of 0.01 mmol/L AR14 as loading carbon resource is helpful for the photocatalytic efficiency of CeO_(2).展开更多
文摘Azo dyes have received considerable attention because of their association with various human health problems. The aim of the investigation is to determine the adsorption behavior ofazo dyes in aqueous solution on DG06, GSE17200, and GSE17201 soils using C. I. Acid Red 14 （AR14） as example. The experimental results indicate that the Freundlich model expresses the adsorption isotherm better than the Langmuir model and the pseudo-second-order model achieves adsorption of AR14 on the three soils well. Based on the pseudo-second-order model, the adsorption thermodynamic of AR14 on DG06 soil have been studied and the thermodynamics parameter of AGO is determined and AGO value shows the adsorption process of AR14 on DG06 is mainly physical in nature. Furthermore, the effects of temperature, pH and salinity （NaC1） on adsorption have been investigated. The decrease in pH or the increase in salinity enhances the adsorption of AR14 by DG06, GSE17200, and GSE17201.
基金Project supported by the National Natural Science Foundation of China (21876158)。
文摘Fe-Ce-OH@AR14 was obtained via the adsorption of acid red 14(AR14) on Fe-Ce-OH prepared by the codeposition of cerium nitrate hexahydrate,ferric nitrate nonahydrate,and ammonia,and then Fe-Ce-O@C with high photocatalyic efficiency was synthesized by the calcination of Fe-Ce-OH@AR14 in N_(2).For comparison,Fe-Ce-O was also prepared by the calcination of Fe-Ce-OH in N_(2).The obtained materials were characte rized by X-ray diffraction(XRD),Raman,X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FT-IR),scanning electron miscroscopy(SEM),photoluminescence(PL),ultraviolet-visible diffuse reflectance spectroscopy(UV-vis) techniques and the results show that the band gap of CeO_(2) can be greatly reduced by doping of Fe^(3+),and that loading carbon from the decomposition of AR14 can prolong carrier life,improve the intensity of visible light absorption,and enhance the concentration of oxygen vacancies.The photocatalytic results using AR14 as probe molecule illustrate that using 1% ferric nitrate nonahydrate(the mass percentage of ferric nitrate nonahydrate to cerium nitrate hexahydrate) as dopant and 25 mL of 0.01 mmol/L AR14 as loading carbon resource is helpful for the photocatalytic efficiency of CeO_(2).
