“…Thiophene removal has been attempted in the literature either by photocatalytic oxidation with suitable catalysts or by adsorption. ,,− We find it relevant to compare our results with the literature in which the adsorptive removal of thiophene compounds has been attempted.…”
The current study addresses the generation of surface-modified nanograined anatase (5 nm) by a single-step in situ process. The EDTA-diol (ester) functionality existing on the surface of anatase nanoparticles was proved with the help of a battery of physicochemical techniques, including FTIR, XPS, and NMR spectral measurements. The sample showed excellent dispersity in ethanol. The anatase lattice showed disorder and had oxygen vacancies. From the XPS analysis, the existence of 14% of Ti 3+ was established. The functionalized sample remained thermally stable up to 250 °C, beyond which it transformed into a graphite−titania nanocomposite. The interfacial ligand (ester) to metal (Ti) charge transfer (LMCT) transitions were present in the UV−visible spectrum of the sample and indicated the functionalization to be covalent. Unsaturated OH-groups on the surface yielded a ζpotential value of −39.8 mV. The covalently functionalized nanotitania was exploited in the adsorptive desulfurization of thiophene, an aromatic sulfur model compound. The consequences of surface adsorption of thiophene were analyzed with the help of UV− visible, FTIR, and 1 H and 13 C NMR spectra and EDS and XPS measurements. The adsorption data, derived from the batch process, were fitted successfully to pseudo-second-order kinetics and the Temkin model. The adsorption capacity of covalently functionalized titania was compared with several other high surface area adsorbents containing thiophilic metal ions.
“…Thiophene removal has been attempted in the literature either by photocatalytic oxidation with suitable catalysts or by adsorption. ,,− We find it relevant to compare our results with the literature in which the adsorptive removal of thiophene compounds has been attempted.…”
The current study addresses the generation of surface-modified nanograined anatase (5 nm) by a single-step in situ process. The EDTA-diol (ester) functionality existing on the surface of anatase nanoparticles was proved with the help of a battery of physicochemical techniques, including FTIR, XPS, and NMR spectral measurements. The sample showed excellent dispersity in ethanol. The anatase lattice showed disorder and had oxygen vacancies. From the XPS analysis, the existence of 14% of Ti 3+ was established. The functionalized sample remained thermally stable up to 250 °C, beyond which it transformed into a graphite−titania nanocomposite. The interfacial ligand (ester) to metal (Ti) charge transfer (LMCT) transitions were present in the UV−visible spectrum of the sample and indicated the functionalization to be covalent. Unsaturated OH-groups on the surface yielded a ζpotential value of −39.8 mV. The covalently functionalized nanotitania was exploited in the adsorptive desulfurization of thiophene, an aromatic sulfur model compound. The consequences of surface adsorption of thiophene were analyzed with the help of UV− visible, FTIR, and 1 H and 13 C NMR spectra and EDS and XPS measurements. The adsorption data, derived from the batch process, were fitted successfully to pseudo-second-order kinetics and the Temkin model. The adsorption capacity of covalently functionalized titania was compared with several other high surface area adsorbents containing thiophilic metal ions.
“…The maximum adsorption capacity could reach as high as 86 mg S g −1 . It worth noting that the high adsorption capacity of the as-prepared porous BN microfibers for DBT (measured value for 41.59 mg S g −1 and theoretical value for 86 mg S g −1 ) can not only surpass those of transitional adsorbents such as zeolite (10.9 mg S g −1 ) 34 , mesoporous silica (3 mg S g −1 ) 35 , activated alumina (16.6 mg S g −1 ) 36 , metal-organic frameworks (MOFs) (12 mg S g −1 ) 37 , activated carbon (10.39 mg S g −1 ) 38 , but also rival those of many newly reported adsorbents, i.e. C-doped BN (35.2 mg S g −1 ) 26 , suggesting an excellent adsorptive desulfurization performance of the porous BN microfibers.Figure 7Langmuir isotherm of DBT adsorption porous BN fibers.
…”
We report on the controllable synthesis of porous BN microfibers and explore their applications as adsorbent for removing dibenzothiophene (DBT) in model oil. The growth evolution of porous BN microfibers has been carefully investigated by correlating their structural characteristics with their synthesis conditions. The as-prepared BN microfibers exhibit very high adsorption capacity for DBT (86 mg S g−1 according to the Langmuir isotherm model), showing excellent adsorptive desulfurization performance. The porous BN after adsorption can be regenerated by a simply heat treatment. After four times recycling, the regenerated adsorption capacity still remains more than 83% of that at the first adsorption. The superb oxidation resistance and chemical inertness, high sulfur adsorption capacity, as well as excellent regeneration performance render the developed porous BN microfibers to be a decent adsorbent for sulfur removal from fuels.
“…In a nutshell, among several conventional and novel desulfurization technologies applied to achieve the necessary requirements for clean motor fuels, the adsorption process is considered as the most attractive solution, especially for desulfurization under ambient conditions (Rashtchi et al 2006;Hasan et al 2012;Shen 2012). Nowadays, numerous sorbents, e.g., impregnated or ionexchanged zeolites, have been synthesized and studied for desulfurization of motor fuels (Wang et al 2009a, b;Yin et al 2012;Wang and Yang 2007;Srivastav and Srivastava 2009;Cychosz et al 2008;Bakhtiari et al 2016a, b;Duan et al 2012;Subhan et al 2012).…”
This paper summarizes the results of a study of adsorption of sulfur compounds from a high-sulfur feed on improved spherical-shaped nano-AgX zeolite. For this purpose, the nano-AgX zeolite was initially synthesized and improved with silver compounds such as silver nitrate, and then it was utilized in the adsorption process. In order to investigate the equilibrium and dynamics of the adsorption process, adsorptive desulfurization of real feed (i.e., sour gas condensate from the South Pars gas field) was carried out in batch and continuous processes under several operating conditions; a temperature-dependent Langmuir isotherm model was used to fit the equilibrium data. The value of monolayer adsorption capacity (q m) and adsorption enthalpy DH ð Þ were calculated to be 1.044 mmol/g and 16.8 kJ/mol, respectively. Furthermore, a detailed theoretical model was employed in order to model the breakthrough experiments. The results revealed that an increase in the feed flow rate and 1=T values will cause linear and exponential increase in the total mass transfer coefficient (k s). Isotherm and dynamic breakthrough models were found to be in agreement with the experimental data.
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