| 1. |
- Li, Kang, et al.
(author)
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C@TiO2 core-shell adsorbents for efficient rhodamine B adsorption from aqueous solution
- 2021
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In: Microporous and Mesoporous Materials. - : Elsevier. - 1387-1811 .- 1873-3093. ; 320
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Journal article (peer-reviewed)abstract
- In the present work, C@TiO2 core-shell adsorbents were successfully prepared and the adsorption capacities for rhodamine B (RB) were investigated at different conditions. The adsorbents were prepared by first in-situ hydrolysis and deposition of TBOT on the surface of ZIF-8 nanoparticles to obtain ZIF-8@titania gel, and then carbonization. XRD, SEM, TEM, and N2 adsorption-desorption techniques were employed to characterize the adsorbents. The results showed that the adsorbents were comprised of TiO2 shell and carbon core. Large surface area and hierarchical pores, which were different from ZIF-8 derived porous carbon, were generated due to the less contraction of carbon during carbonization when robust TiO2 shell covered on the surface. The highest adsorption capacity for RB was 298 mg/g on C@TiO2. Apart from the hierarchical pores and large surface area, the low surface charge of C@TiO2 core-shell adsorbents was also observed, which also contributed to the high adsorption capacity for cationic dyes. The reuse experiments showed that the adsorbents maintained the high adsorption capacity after 5 cycles. The high stability is crucial for practical application.
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| 2. |
- Li, Kang, et al.
(author)
-
Removal of dyes from aqueous solution using novel C @ C composite adsorbents
- 2021
-
In: Microporous and Mesoporous Materials. - : Elsevier. - 1387-1811 .- 1873-3093. ; 313
-
Journal article (peer-reviewed)abstract
- In the present work, novel porous C@C composite adsorbents were prepared and applied for the adsorption of methylene blue (MB) and rhodamine B (RB). The adsorbents were prepared by carbonizing resorcinol–formaldehyde (RF) resins-coated ZIF-8 composites that obtained using an in-situ deposition method. The effect of RF/ZIF-8 ratio and carbonization temperature on the particle size, specific surface area and pore size was investigated. High adsorption capacity resulted from the high surface area of 1842 m2/g and a sufficient pore size of 4.4 nm. The effect of temperature, initial dyes concentration and pH on the adsorption capacity was investigated to optimize the adsorption conditions, and maximum adsorption capacity of 681 and 462 mg/g was observed for MB and RB, respectively. Langmuir model and pseudo-second-order adsorption kinetics model can be used to well describe the obtained adsorption isotherms. The estimated saturated adsorption capacity for MB and RB was 806 and 476 mg/g, respectively. The used C@C-1000 could be regenerated in methanol solution, and after 5 cycles, the adsorption capacity was maintained above 92% of the maximum.
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