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(a) N2 gas adsorption-desorption isotherms at 77 K and (b) pore size distribution for Zr(OH)4/GO nanocomposite and pristine Zr(OH)4. All samples were degassed at 393 K under 133 mbar before measurement to eliminate impurities in pores. Pore size distribution was analyzed by using the Barrett–Joyner–Halenda (BJH) method based on Kelvin equation.
