A novel heavy metal flocculant dithiocarboxyl hydroxymethy-polyacrylamide (DTMPAM) was synthesized with polyacrylamide,formaldehyde,carbon disulfide and sodium hydroxide.Taking removal rate of Cu(Ⅱ) in water samples as the main indicator,the main influencing factors in the preparation of DTMPAM was confirmed by Plackett-Burman experiment,and then the steepest ascent experiment was employed to approaching the level values of main influencing factors.Finally,the preparation conditions of DTMPAM were optimized through central composite design (CCD) of response surface methodology (RSM).The results showed that the regression of quadratic polynomial model established with CCD was significant while the lack of fit was not significant.The multiple correlation coefficient (R2) was 0.9275,which demonstrated the model had good fitness.The optimum conditions for the preparation of DTMPAM were as follows:the mass fraction of MPAM was 0.5%,the molar ratio of MPAM,CS2 and NaOH was 1∶1.43∶1.43,pre-reaction temperature was 25℃,pre-reaction time was 60min,main-reaction temperature was 45℃,and main-reaction time was 70min.Under the optimum conditions,the removal rate of Cu (Ⅱ) could reach 98.63%,which was close to the predicted value 98.86% of model.The result proved that the model established by RSM was reasonable and feasible.
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基金资助
国家自然科学基金项目(51368030)
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