【摘要】 研究了γ辐照法对不同河流湖泊沉积物中六氯苯(HCB)的降解效果,以及不同河流湖泊沉积物、HCB浓度、添加物、pH和容器内径对HCB辐照降解的影响,并对其降解动力学进行了探讨。结果表明,γ辐照法对南京玄武湖沉积物HCB模拟样品中HCB的降解率要高于长江南京上新河段和南京前湖沉积物HCB模拟样品;辐照下HCB质量浓度为10mg/kg的长江南京上新河段沉积物HCB模拟样品的HCB降解率最高;添加H2O2能提高HCB的降解率,添加NaNO3和异丙醇降低了HCB的降解率;添加NaNO3的HCB降解率要高于添加异丙醇;pH越高HCB的降解率越大;容器内径对γ辐照降解容器中HCB的效果有较大影响,在其他实验条件一致下采用γ辐照降解HCB时,应尽量减小容器内径。更多还原

【Abstract】 The paper presents a study of γ irradiation for degradation of hexachlorobenzene (HCB) in 3 different sediment samples focusing on the effects of the HCB content,the reactor size (thickness of the sample),additive,and pH on the HCB removal efficiency. The degradation rate of HCB in the Lake Xuanwu sediment was higher than those in the Changjiang River sediment and the Lake Qian sediment. In the Changjiang River sediment,the higher HCB content resulted a higher HCB degradation rate. Addition of 3% H2O2 enhanced the degradation efficiency of HCB; however the removal was adversely affected by adding 100 mg/L NaNO3 or 5% Isopropyl alcohol. The degradation rate was better at a higher pH. The degradation rate was consistent with the first order reaction kinetics. Gamma irradiation may be employed for degrading HCB present in many types of sediment.更多还原