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(i) XRD patterns and (ii) FTIR spectra of (a) C14-Ver-100%, (b) C14-Ver-200%, (c) C16-Ver-100%, (d) C16-Ver-200%, (e) C18-Ver-100%, and (f) C18-Ver-200% after diclofenac adsorption (25 °C, pH 6.0 or 8.0 and Ci = 500 mg L–1) and (g) free diclofenac sodium.
