Thiophene is one of typical refractory organic pollutants in coal chemical wastewater, which cannot be effectively removed by traditional biological treatment processes. In this study, ionizing radiation was used to degrade thiophene. The effect of absorbed dose, initial concentration and pH on the thiophene degradation was investigated. The results showed that thiophene could be completely degraded when the its initial concentration was 5 mg/L, the pH was 9, and the absorbed dose was 5 kGy. The results of quenching experiments indicated that all the hydroxyl radicals, hydrated electron and hydrogen radicals were responsible for the degradation of thiophene, which explained the wide range of pH application for the thiophene degradation by ionizing radiation. Four degradation intermediates were identified, including thiophene 1-oxide, thiophen-2-ol, 2,3-dihydrothiophen-2-ol and acetic acid, and two possible pathways of thiophene degradation were thus proposed. Ecological structure activity relationships program analysis suggested that thiophene 1-oxide and thiophen-2-ol were more toxic than thiophene. In general, ionizing radiation is an effective technology for thiophene degradation.

噻吩是煤化工废水中典型的难降解有机污染物之一，传统的生物处理工艺无法有效去除。在这项研究中，电离辐射用于降解噻吩。研究了吸收剂量、初始浓度和 pH 值对噻吩降解的影响。结果表明，噻吩在初始浓度为5 mg/L、pH为9、吸收剂量为5 kGy时可被完全降解。猝灭实验结果表明，所有的羟基自由基、水合电子自由基和氢自由基都对噻吩的降解负责，这解释了电离辐射降解噻吩的广泛pH应用。确定了四种降解中间体，包括噻吩 1-氧化物、噻吩-2-醇、因此提出了 2,3-二氢噻吩-2-醇和乙酸以及两种可能的噻吩降解途径。生态构效关系程序分析表明噻吩1-氧化物和噻吩-2-醇比噻吩毒性更大。一般来说，电离辐射是一种有效的噻吩降解技术。