响应面法优化水葫芦生物炭吸附尼泊金乙酯工艺研究

ADSORPTION PROCESS OPTIMIZATION FOR ETHYLPARABEN BY MODIFIED WATER HYACINTH BIOCHAR USING RESPONSE SURFACE METHODOLOGY

以水葫芦为原材料,柠檬酸改性制备生物炭对尼泊金乙酯(EP)的吸附。通过Box-Behnken Design实验,使用吸附剂添加量、pH值、EP初始浓度和反应时间这四个变量对尼泊金乙酯去除率的影响进行模拟优化。实验结果表明:水葫芦生物炭(WB)与柠檬酸改性水葫芦生物炭(CA-WB)在各单因素实验中对EP溶液去除影响的大小顺序为:吸附剂添加量>EP浓度>pH>反应时间。WB吸附EP的最佳反应条件为:pH为1.12、反应时间为3.28 h、EP初始浓度为18.4 g/L和WB添加量为3.86 g/L,此时WB对EP的去除率为81.04%,实际条件下验证EP去除率为85.12%,与预测值误差为4.79%;CA-WB吸附EP的最佳反应条件为:pH为2.8、反应时间为3.23 h、EP初始浓度为14.7 mg/L和CA-WB添加量为3.73 g/L,此时CA-WB对EP的去除率为96.00%,实际条件下验证EP去除率为93.24%,与预测值误差为2.96%。

The adsorption performance of citric acid modified water hyacinth biochar(CA-WB)on ethyl paraben(EP)was investigated.SEM,XPS and FT-IR were used to characterize the properties of water hyacinth biochar.The effects of adsorbent dosage,initial concentration of EP,pH and reaction time on the removal of EP were investigated according to a Box-Behnken Design of experiment design,and response surface optimization was performed.The results showed that the effects of water hyacinth biochar(WB)and citric acid modified water hyacinth biochar(CA-WB)on the removal of EP were adsorbent addition>EP concentration>pH>reaction time in the single-factor experiments.The optimum conditions for the adsorption of EP by WB were pH 1.12,reaction time 3.28 h,initial EP concentration 18.4 g/L and WB 3.86 g/L.The removal rate of EP by WB could reach 81.04%at this time.The verified EP removal rate was up to 85.12%under the actual conditions,and the error was 4.79%compared with the predicted value.The optimum conditions for the adsorption of EP by CA-WB were pH 2.8,reaction time 3.23 h,initial concentration of EP 14.7 mg/L and the amount of CA-WB 3.73 g/L.The removal rate of EP by CA-WB was 96.00%at this time.And the verified EP removal rate under actual conditions was 93.24%with an error of 2.96%from the predicted value.