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Study on the Adsorption of Orange G dye by the PA65 with Pore Structure

Gao Zhicheng,Zhang Lei,Shi Xin,Yang Jun,Wang Xunqiu

So far, the purification of dyes wastewater through adsorption and other economical and environmentally friendly methods had received great attention. Therefore, this study mainly discussed the role and rule of PA65 material in wastewater dye treatment. In the experiment, the effects of pH value of solution, initial dye concentration, amount of adsorbent and adsorption time on the removal rate of orange G were studied. It was found that under the conditions of pH < 6, initial dye concentration of about 70 mg·L −1 , amount of adsorbent of about 60 mg, and adsorption time of 120 min, good adsorption performance could be achieved. Under acidic conditions, the PA65 with a pore structure exhibited certain adsorption performance for anionic dyes and had higher selectivity for binary mixed dyes. FITR analysis confirmed the presence of amide groups and amino groups interacting with dye molecules. In addition, the experimental data was fitted by adsorption isotherms and adsorption kinetics model. The results showed that the Langmuir model best describes the equilibrium isotherm data, showing a maximum adsorption capacity of 63.17 mg‧g −1 , and the adsorption data follows the pseudo-second-order dynamics model. The thermodynamic properties revealed that the adsorption process was endothermic and spontaneous.