Preparation of Mn3O4/CTS and Desorption Study of Molybdenum-containing Wastewater
Industrial wastewater was seriously polluted,and it was expected to prepare an effective molybdenum removal adsorbent,then investigate its removal effect on molybdenum-containing wastewater,and find the best combination of condi-tions and the best desorption scheme.One-step hydrolytic oxidation and cross-linking methods were used to prepare Mn3O4 nanoparticles and manganese tetraoxide/chitosan(Mn3O4/CTS)composite nanoparticles,respectively.Orthogonal methods were used to determine the optimal combinations of Mn3O4/CTS for molybdenum removal.One-way controlled variable meth-od was applied to the desorption test,and the desorption performances under different desorption conditions were analyzed.The results showed that the best conditions for the preparation of Mn3O4 particles were 12 mL of anhydrous ethanol,110 mL of NaOH,and 40℃ for 1.5 h,and the molybdenum removal rate was more than 70％.The best molybdenum removal effect was achieved when the Mn3O4/CTS particles were prepared under the conditions of m(chitosan):m(Mn3O4)=3∶1,30 mL of acetic acid,2 mL of glutaraldehyde,and 150 r/min stirring speed,the molybdenum removal rate was 90.62％.The order of the degree of molybdenum removal was as initial pH＞adsorbent amount＞oscillation speed＞temperature.The optimum desorption solu-tion was determined to be 0.05 mol/L NaOH,the desorption time was 30 min,the desorption temperature was 40 ℃,and the molybdenum removal rate of more than 80％could be satisfied even after 5 times of desorption.The prepared Mn3O4/CTS com-posite nanoparticles were effective in removing molybdenum and could produce an excellent and stable regeneration effect.
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