Fig. 8From: Functionalization of hydroxyapatite derived from cockle (Anadara granosa) shells into hydroxyapatite–nano TiO2 for photocatalytic degradation of methyl violetChromatogram from HPLC analysis of MV photooxidation treatment [Initial MV concentration = 25 mg L− 1, H2O2 = 10− 4 M, catalyst dosage = 0.25 g L− 1]Back to article page