Abstract
In the present paper, granular activated carbon (GAC) supported titanium dioxide (TiO2@GAC) particles were prepared by sol-gel process. Their performance in simultaneous adsorption of dye and Cu2+ from wastewater was studied. X-ray diffraction (XRD) indicated that TiO2 of the TiO2@GAC microsphere is anatase type, and Fourier transform infrared spectroscopy (FT-IR) showed that the samples have obvious characteristic peaks in 400–800 cm−1, which indicated that there are Ti-O-Ti bonds. The experimental results showed that the adsorption of TiO2@GAC for Methylene blue (MB) and Cu2+ were favorable under acidity condition, the adsorption of Methyl orange (MO) was favorable under alkalecent condition. The reaction kinetics of TiO2@GAC for MO, MB and Cu2+ were well described as pseudo-second-order kinetic model; The reaction isotherms for MO, MB and Cu2+ were well fitted by Langmuir model. The maximum adsorption capacity of TiO2@GAC for MO, MB and Cu2+ in the single systems were 32.36 mg/g, 25.32 mg/g and 23.42 mg/g, respectively. As for adsorption, Cu2+ had a suppression effect on MB, and a promotion effect on MO, however, the impact of MO and MB on Cu2+ were negligible.
Highlights
With the rapid development of industry, there is more and more concern about toxic dyes and heavy metal ions in untreated waste water from industrial production processes[1]
Titanium dioxide is very promising for environment-purifying applications since ion doping and immobilization[8,9,10,11]
Titanium dioxide is present in the form of powder and is difficult to be separated from aqueous solution for recovery and reuse
Summary
Received: 23 November 2017 Accepted: 10 April 2018 Published: xx xx xxxx and Copper Ions. Granular activated carbon (GAC) supported titanium dioxide (TiO2@GAC) particles were prepared by sol-gel process. Their performance in simultaneous adsorption of dye and Cu2+ from wastewater was studied. Asuha et al.[7] investigated the adsorption performance of TiO2 for methyl orange and Cr(VI) Among these adsorbent materials, titanium dioxide is very promising for environment-purifying applications since ion doping and immobilization[8,9,10,11]. The combination of granular activated carbon and titanium dioxide can accelerate the settling rate and enhance the adsorption capacity, making up for the shortcomings of TiO2 and thereby allowing wide application in wastewater treatment[12]. Where C0 represents the concentration before adsorption and Ct represents the concentration after adsorption
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