Photocatalytic degradation of rhodamine B based on membrane catalyst of H 3 O 40 PW 12 /quaternized chitosan

Increasing environmental pollution caused by toxic dyes due to their hazardous nature is a matter of great concern, and lacks the effective methods to remove them. Therefore, in this research a series of H 3 O 40 PW 12/ Quaternized chitosan (PW X% /QCS) membrane catalyst is synthesized based on QCS (positively charged) and keggin‐type H 3 O 40 PW 12 (negatively charged), which is available to degrade rhodamine B. The optimum experimental conditions are investigated and results reveal that the degradation rate is over 92.1% and the chemical oxygen demand (COD) decreases is 78.09%, which is obtained based on the follow conditions is that the UV radiation is 90 min, the dose of membrane catalyst is 0.1g, the doping amount PW 12 (H 3 O 40 PW 12 ) is 35 wt%, RB aqueous solution (30mL) is 5mg/L, the reaction temperature is 30°C, pH = 5 and H 2 O 2 is 20mM. The simulation result reveals that the photocatalytic degradation reaction of RB with PW X% /QCS membrane catalyst in an aqueous solution can be described by the Langmuir–Hinshelwood equation. And the initiation rate constant and the initiation adsorption constant in this case are 4.082mg/(L/min) and 0.01090L/mg, respectively.