Efficient adsorption and photocatalytic degradation of organic dyes by novel chitosan/polyaniline/MnFe2O4 composites

Using aniline and environmentally friendly chitosan as raw materials, MnFe 2 O 4 with photocatalytic properties was introduced and in-situ polymerization was used to prepare Cht/PANI/MnFe 2 O 4 . The Cht/PANI/MnFe 2 O 4 was characterized by FTIR, SEM, XPS, XRD, BET and TGA. The experiment on the influence of pH on the adsorption capacity of the material shows that an acidic environment is conducive to the adsorption of fuel by the adsorbent. The zero charge point (pH PZC ) on the adsorbent surface is obtained at pH 6.45. The adsorption kinetic model conformed to the pseudo second order model, and the adsorption isotherm was in agreement with the Langmuir isotherm model. The q max values of Cht/PANI/MnFe 2 O 4 and Cht/PANI were 202.84 and 148.37 mg·g −1 . Experimental results have shown that Cht/PANI/MnFe 2 O 4 exhibits photocatalytic performance, which is superior to pure MnFe 2 O 4 .The maximum removal amount of Cht/PANI/MnFe 2 O 4 at equilibrium is 2569.66 mg·g −1 . The photocatalytic process of Cht/PANI/MnFe 2 O 4 also conforms to the pseudo-second-order kinetic model. The material has the advantages of simplicity and environmental friendliness and has potential application prospects in the purification of dye wastewater. The study proposed possible mechanisms for the adsorption and photocatalysis of CR.