萘在水溶液中的辐照分解  

Gamma radiation-induced degradation of naphthalene in aqueous solution

作　　者：余少青[1] 王建龙[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第6期864-867,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50678089)

摘　　要：为去除优先污染物多环芳烃,研究了其在空气饱和的中性水溶液中的γ辐照分解,探讨了萘的分解机理。选取萘作为代表化合物,用高效液相色谱检测分解率,用紫外可见分光光度法分析分解过程。在剂量率为235 Gy/min和7.22 Gy/min的条件下,萘的初始分子变化量(Gi)分别为6.30和23.18。在吸收剂量为200Gy、剂量率为235Gy/min时,以及吸收剂量为50 Gy、剂量率为7.22 Gy/min时,均有约80%的萘分解。当剂量率为7.22 Gy/min、吸收剂量增至500 Gy时,辐照后溶液的pH值下降至4.1。这表明产物中总有机酸含量增加。Naphthalene degradation by gamma irradiation was investigated in neutral aqueous solutions in the presence of air as a function of the absorbed radiation dose. The preliminary radiolytic degradation efficiency was monitored by HPLC （high performance liquid chromatography）. The nature of the degradation pattern was studied by spectrophotometry. The observed initial degradation yields （Gi values） were 6.30 for 235 Gy/min and 23.18 for 7.22 Gy/min. For 200 Gy （dose rate was 235 Gy/min） or 50 Gy （dose rate was 7.22 Gy/min）, approximate 80% of the naphthalene was degraded. For an absorbed radiation dose of up to 500 Gy （dose rate was 7.22 Gy/min）, the pH of the irradiated solution decreased to 4.1, indicating the increasing total yield of the organic acids, A probable reaction mechanism was presented to illustrate the rather complicated degradation process.

关 键 词：废水处理 萘 多环芳烃 γ辐照分解 

分 类 号：X703[环境科学与工程—环境工程]