活性炭纤维、二氧化氯及其联用工艺去除2-MIB

2-methylisoborneol removal by activated carbon fiber, chlorine dioxide and their combined process

采用液液萃取与气相色谱-质谱联用技术研究二氧化氯、活性炭纤维及二氧化氯与活性炭纤维联用3种方法对2-MIB的去除效果,考察二氧化氯和活性炭纤维投加量、溶液pH和底物初始质量浓度对目标物去除效果的影响。研究结果表明:ClO2单独去除的最佳投加量为8 mg/L,pH<7时效果较好。ACF最佳投加量和最佳pH分别为20 mg/L和6.14。2-MIB的去除率都随其初始质量浓度增大而降低。ACF与ClO2联用工艺中二者投加量分别为1 mg/L和14 mg/L时,2-MIB的去除率可达88.2%,比单独吸附去除效果提高4.6%,同时降低30%的ACF投加量,此外,联用工艺对于处理低质量浓度的2-MIB更为有效。ACF吸附2-MIB符合伪二级反应动力学模型,粒子内部扩散是吸附过程的主要控制步骤,吸附可能是个复杂的非均相固液反应。

The effects of chlorine dioxide, activated carbon fiber and their combined process on the removal of 2-methylisoborneol （2-MIB） were investigated by using liquid-liquid extraction and gas chromatography-mass spectrometry （GC-MS）. The influences of the dosages of chlorine dioxide and activated carbon fiber, pH of the reaction mixture and initial substrate concentration on the removal efficiency of 2-MIB were studied. The results show that the optimal doses are 8 mg/L for CIO2. A better oxidation efficiency is obtained at pH〈7, and the optimum dosage and pH for ACF adsorption are 20 mg/L, 6.14 respectively. For both oxidation and adsorption, the removal efficiency decreases with increasing 2-MIB concentration. When the addition dosages of chlorine dioxide and ACF are 1 mg/L and 14 mg/L respectively in the combined process of activated carbon fiber and chlorine dioxide, the removal rate of 2-MIB is measured up to 88.2%. Compared with ACF adsorption alone, the removal rate raises 4.6%, and a 30% reduction of ACF dosage simultaneously. In addition, the combined process is more effective for 2-MIB removal in low concentration Kinetics study indicates that ACF adsorption of 2-MIB fits the pseudo second-order kinetic model well. The intra-particle diffusion is the main rate-controlling step of adsorption process. Moreover, the adsorption of 2-MIB could be a complex heterogeneous solid-liquid reaction.