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. 2018 Feb 7;8(12):6315-6325.
doi: 10.1039/c7ra11565b. eCollection 2018 Feb 6.

One-step preparation of a novel SrCO3/g-C3N4 nano-composite and its application in selective adsorption of crystal violet

Peng Lu  1 , Xueli Hu  2 , Yujie Li  1 , Meng Zhang  1 , Xiaoping Liu  2 , Youzhou He  2 , Fan Dong  2 , Min Fu  2 , Zhi Zhang  1
Affiliations

One-step preparation of a novel SrCO3/g-C3N4 nano-composite and its application in selective adsorption of crystal violet

Peng Lu et al. RSC Adv. .

Abstract

A novel kind of nanoparticle SrCO3/g-C3N4 was prepared using strontium carbonate (SrCO3) and melamine (C3H6N6) as raw materials via one-step calcination. The formation of SrCO3/g-C3N4 was confirmed from the X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Brunauer-Emmett-Teller (BET) and X-ray photoelectron spectroscopy (XPS) analysis. Its selective adsorption performance was evaluated towards crystal violet (CV), rhodamine B (RhB) and methylene blue (MB). The results showed that the SrCO3/g-C3N4 had selective adsorption ability of CV. Furthermore, adsorption measurements of CV were conducted to investigate the influences of contact time, initial concentration, initial dye solution pH value and adsorbent dosage. The maximum removal rate of CV was 98.56% when the initial concentration was 1600 mg L-1. The kinetic study indicated the adsorption of CV followed the pseudo-second-second model well. The adsorption efficiency of SrCO3/g-C3N4 was greater (97.46%) than that of g-C3N4 (31.30%) and SrCO3 (17.30%). It could be deduced that the synergistic effect of conjugation interaction of g-C3N4 and the electrostatic attraction of SrCO3 might be the main driving force for the superb adsorption of CV.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. XRD patterns of the g-C3N4, SrCO3 and SrCO3/g-C3N4.
Fig. 2
Fig. 2. FT-IR spectra of the g-C3N4, SrCO3 and SrCO3/g-C3N4.
Fig. 3
Fig. 3. XRD patterns (a) and FT-IR spectra (b) of the HCl-treated SrCO3/g-C3N4.
Fig. 4
Fig. 4. SEM images of the g-C3N4 (a), SrCO3 (b) and SrCO3/g-C3N4 (c); TEM images of the SrCO3/g-C3N4 (d).
Fig. 5
Fig. 5. XPS survey spectra of g-C3N4, SrCO3 and SrCO3/g-C3N4 (a) and high-resolution XPS spectrum: C 1s (b), N 1s (c), O 1s (d) and Sr 3d (e).
Fig. 6
Fig. 6. Optical photographs of single adsorption of MB (a), CV (b) and RhB (c); the selective adsorption of CV from CV/MB (d) and CV/RhB (e) mixture, UV-vis spectra of CV/MB (f),CV/RhB (g) and CV/MB/RhB (h) mixture before and after adsorption.
Fig. 7
Fig. 7. Effect of the initial pH of mixed dye solution CV/MB (a), CV/RhB (b) and CV/MB/RhB (c).
Fig. 8
Fig. 8. Effect of contact time.
Fig. 9
Fig. 9. Effect of initial CV concentration.
Fig. 10
Fig. 10. Effect of SrCO3/g-C3N4 dosage.
Fig. 11
Fig. 11. Effect of the initial pH of CV.
Fig. 12
Fig. 12. Pseudo-first-order (a), and pseudo-second-order (b) kinetic plots for adsorption.
Fig. 13
Fig. 13. Reusability of the adsorbent.
Fig. 14
Fig. 14. Comparisons of the adsorption effect of the SrCO3, g-C3N4, and SrCO3/g-C3N4.
Fig. 15
Fig. 15. FT-IR spectra of SrCO3/g-C3N4 before and after adsorption.
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