| Summary: | Rhodamine B (RB) as a fluorescent dye has toxic effects in the environment, humanity and potentially harmful to ecological systems, therefore it needs to be removed. Adsorption is a simple and cost friendly approach, but the adsorption capacity of the reported adsorbents needs to improve. Herein, the preparations of C@titania core-shell nanoparticles for the efficient elimination of RB from simulated textile wastewater was studied. The nanoparticles were prepared by first coating a layer of titania gel on ZIF-8 and HKUST-1 nanoparticles via hydrolysis of Titanium butoxide (TBOT) and followed by carbonization. XRD, FTIR, SEM, TEM, and N2 adsorption-desorption analysis was used to explore the obtained products. The adsorption for RB in the simulated textile wastewater with different pH was investigated. TEM pictures visibly illustrate the core-shell structures with a thickness of the titania layer of 14 to 25 nm. N2 adsorption-desorption results display the textural characteristics of the products with mainly meso-pores and a relative high surface area of 107 and 43 m2 g-1 for C@titania core-shell prepared from ZIF-8 and HKUST respectively. The equilibrium adsorption capacities have its climax at pH 7. The maximum RB adsorption capacities of the C@titania core-shell nanoparticles prepared from ZIF-8 and HKUST are 174.4 and 106.3 mg g-1, which is higher than the parental carbons. The C@titania nanoparticles can be easily made and their RB adsorption capacities is relatively high. The results show that the C@titania nanoparticles are potential candidates for elimination of RB from water.
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