This paper investigated the effects of β-cyclodextrins （I3-CD） and its two derivatives, hydroxypropyl-β-cyclodextrin （HPCD） and carboxymethyl-β-cyclodextrin （CMCD）, on the solubility and biodegradation of 2-nitrophenyl by an A cinetbacter sp. Results showed that β-CD, HPCD and CMCD could not be utilized by A cinetbacter sp. as sole carbon source and none of the CDs had toxic effects on the growth of the bacteria in the experiments; all the CDs could enhance the apparent solubility and accelerate the biodegradation of 2-nitrobipheny. It showed that biodegradation-accelerating effects of CDs on 2-nitrobiphenyl were correlated with their solubility-enhancing effects. Among three CDs investigated, CMCD had the most obvious effects both on the apparent solubility and the biodegradation, followed by β-CD and HPCD.
研究了添加羟丙基-β-环糊精(HP--βCD)和羟丙基-γ-环糊精(HP--γCD)对土壤中的2-硝基联苯在1 h内的解吸动力学的影响.随着环糊精添加质量浓度的增加,2-硝基联苯的最大质量浓度和解吸速率均比对照显著增加.2-硝基联苯的水相质量浓度C与时间t之间符合曲线方程:C=Cma′x(1-e-kt),其中,Cma′x是最大解吸质量浓度,解吸速率常数k=0.159 1 m in-1.根据由溶解度曲线计算的环糊精对2-硝基联苯的包合平衡常数Ks以及2-硝基联苯在土壤中的吸附平衡方程,推导了2-硝基联苯的最大解吸浓度的估算式,当HP--βCD与土壤中初始吸附的2-硝基联苯的摩尔比大于等于3.09时(对于HP--γCD,摩尔比须大于等于10.47),估算值与实测值很接近,此式可用来估算使2-硝基联苯达到最佳解吸率所需的环糊精的最小用量.
