Fig. 1

XRD patterns (a), magnification of the corresponding (002) peak (b), Nitrogen adsorption-desorption isotherms (c) and BJH pore size distributions (d) of g-C3N4 and VN-g-C3N4.

XRD patterns (a), magnification of the corresponding (002) peak (b), Nitrogen adsorption-desorption isotherms (c) and BJH pore size distributions (d) of g-C3N4 and VN-g-C3N4.