针对处理印染废水问题,以辣椒秸秆为原料,柠檬酸为改性剂,探索在超声辅助条件下,辣椒秸秆对刚果红的吸附情况。结果表明:最佳吸附条件是温度为65℃,用0.3g改性辣椒秸秆,刚果红溶液初始浓度为200mg/L刚果红溶液、超声时间110min。经对比发现,该吸附过程更符合准二级动力学方程(R2=0.99248),为化学吸附,吸附过程符合Freundlich等温方程(R2=0.82733)。经正交实验极差和方差分析得出最佳吸附组合为:投加量0.3g,染料的初始浓度240mg/L,吸附温度55℃,吸附时间90min,其中吸附剂用量对吸附效果的影响最为显著。
In order to address the problem of printing and dyeing wastewater,the adsorbent was prepared with pepper straw as raw material and citric acid as modifier under ultrasound-assisted conditions.The effects of different factors on the adsorption of Congo red by modified pepper straw were studied.The results showed that the optimal adsorption conditions were temperature of 65℃,modified pepper straw of 0.3g,initial Congo red solution concentration of 200mg/L and sonication time of 110min.By comparison,it was found that the adsorption process was more consistent with the quasi-second-order kinetic equation (R2=0.99248),which was chemisorption,and the adsorption process was consistent with the Freundlich isothermal equation (R2=0.82733).According to the orthogonal experiment range and variance analysis,the optimal adsorption combination was as follows:the dosage of 0.3g,the initial dye concentration of 240mg/L,the adsorption temperature of 55℃,and the adsorption time of 90 min.Among them,the dosage of adsorbent had the most significant effect on the adsorption effect.
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