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A TiO2/crosslinked carboxymethyl starch composite for high-efficiency adsorption and photodegradation of cationic golden yellow X-GL dye

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Abstract

In this paper, a crosslinked carboxymethyl starch (CCMS) was prepared with corn starch as the raw material, epichlorohydrin as the crosslinking agent, and chloroacetic acid as the etherifying agent through a series of crosslinking, alkalization, and etherification reactions, respectively. Nano-TiO2 was loaded onto the surface of the CCMS by the sol-gel method to obtain a TiO2/CCMS composite. The TiO2/CCMS composite was characterized by XPS, XRD, SEM, and BET. XPS showed that the surface chemical composition of the TiO2/CCMS composite material contained titanium; XRD diffraction patterns indicated that the crystal form of the TiO2/CCMS composite was a combination of the CCMS and anatase TiO2. The surface morphology obtained by SEM showed that there were nano-TiO2 particles on the surface of the CCMS. The specific surface area of the TiO2/CCMS composite was larger than that of CCMS. The adsorption-photodegradation performance of the TiO2/CCMS composite was also studied under UV irradiation, and the results showed that significant adsorption-photodegradation synergies occurred.

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Acknowledgments

The first author would like to thank Tianjin Polytechnic University for providing scientific research facilities and encouragement from all involved teachers.

Funding

This work was financially supported by the National Youth Science Foundation of China (5150030497).

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Correspondence to Jing Guo.

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The authors declare that they have no conflict of interest.

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Responsible editor: Suresh Pillai

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Highlights

The CCMS matrix used as an adsorbent was synthesized via crosslinking, alkalization, and etherification reactions.

The TiO2/CCMS composite with 3 wt% TiO2 was prepared by the sol-gel method.

The TiO2/CCMS composite showed a significant adsorption-photodegradation synergism of the X-GL dye.

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Guo, J., Wang, J., Zheng, G. et al. A TiO2/crosslinked carboxymethyl starch composite for high-efficiency adsorption and photodegradation of cationic golden yellow X-GL dye. Environ Sci Pollut Res 26, 24395–24406 (2019). https://doi.org/10.1007/s11356-019-05685-y

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  • DOI: https://doi.org/10.1007/s11356-019-05685-y

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