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基于“以废治废”的理念,以农林业废弃物——油茶饼为原料制备生物吸附剂,吸附去除废水中的RR15(C.I.Reactive Red 15,活性红15)染料,并采用响应曲面法中的Box-Behnken设计对油茶饼生物吸附剂吸附RR15的条件进行优化.结果表明:p H对油茶饼生物吸附剂吸附RR15的吸附容量和去除率均有显著影响(P<0.000 1);当p H为1.0、初始ρ(RR15)为300 mg/L、吸附温度为20℃时,油茶饼生物吸附剂对RR15的吸附效果最佳.相比于Langmuir和Freundlich吸附等温线模型,Temkin吸附等温线模型可以更好地描述油茶饼生物吸附剂对RR15的吸附平衡数据.吸附温度为20℃时,由Langmuir吸附等温线模型计算得到的Q0(吸附剂的单层饱和吸附量)为74.63 mg/g.动力学分析显示,油茶饼生物吸附剂对RR15的吸附过程符合准二级动力学模型(R2>0.999 7),支持了限速步骤是化学吸附的理论;内部扩散和边界层扩散都可能影响吸附速率.热力学分析表明,该吸附过程是一个自发的放热过程.FTIR(fourier transform infrared spectroscopy,傅里叶变换红外光谱)分析发现,油茶饼生物吸附剂上羟基、胺基等官能团可能是RR15染料的主要结合位点.研究显示,油茶饼生物吸附剂是一种具有潜力的绿色吸附剂,可以有效去除废水中的RR15染料.
Based on the concept of “treating waste by waste”, bio-adsorbents were prepared by using agroforestry-waste tea cake as raw material, adsorbing and removing RR15 (reactive red 15) from waste water and adopting response surface Box-Behnken design was used to optimize the conditions for the adsorption of RR15 on the bio-adsorbent of Camellia oleifera.Results showed that p H had significant effects on the adsorption capacity and removal rate of RR15 adsorbed on the bio-adsorbent of Camellia oleifera (P <0.000 1). The results showed that the adsorption efficiency of RRP was the best when the pH was 1.0, the initial RR (ρ) was 300 mg / L and the adsorption temperature was 20 ℃ .Compared with the Langmuir and Freundlich adsorption isotherm models, the adsorption of Temkin The isotherm model can better describe the adsorption equilibrium data of the oil-tea cake biosorbent for RR 15. When the adsorption temperature is 20 ℃, the Q0 (monolayer saturated adsorption capacity) calculated by the Langmuir adsorption isotherm model is 74.63 mg / g. Kinetic analysis showed that the adsorption of RR15 by the Camellia cake biosorbent met the quasi-second-order kinetic model (R2> 0.999 7), supported the theory that the rate-limiting step was chemisorption; both internal diffusion and boundary layer diffusion May affect the adsorption rate The analysis showed that the adsorption process was a spontaneous exothermic process.FTIR (fourier transform infrared spectroscopy) analysis showed that the functional groups such as hydroxyl group, amine group and other functional groups on the bio-adsorbent of Camellia oleifera could be the main combination of RR15 dye Site.Studies have shown that Camellia cake bioadsorbent is a potential green adsorbent that can effectively remove RR15 dye from wastewater.