As typical heteroaromatic compounds, thiophene is an air pollutant that pose serious environmental and health related impacts due to its volatility and toxicity. This work reports a hybrid process of absorption combined with electrochemical oxidation to degrade thiophene. The ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF₄) was employed as the absorbent to capture thiophene from air stream. Linear sweep voltammetry (LSV) demonstrated that thiophene could be oxidized on β-PbO₂ anode modified with fluoride at 1.28 V versus Ag/Ag + electrode (RE) with a scan rate of 100 mV/s while [BMIM]BF₄ was used as the electrolyte. Results of bulk electrolysis showed that thiophene could be thoroughly degraded within 60 min in [BMIM]BF₄ under 50 mA/cm² due to the successive attack of hydroxyl radicals (·OH) produced by electrolysis on the surface of β-PbO₂ anode. Acetic acid was determined as the main intermediate and could be further mineralized to fumaric acid, maleic acid and oxalic acid, while sulfur atom in thiophene was finally converted to sulfate ions (SO₄²⁻). Based on the HPLC analysis and a precipitation of BaSO₄, degradation pathway of thiophene was proposed and the thiophene sulfur could be degraded completely into sulfate. The kinetics of the electrochemical oxidation process for thiophene can be described by the pseudo-first order model. This absorption-electrochemical oxidation method with continuous operation would be a promising way for the clean and safe removal of heteroaromatic compounds from waste gases.

作为典型的杂芳族化合物，噻吩是一种空气污染物，由于其挥发性和毒性而对环境和健康造成严重影响。这项工作报告了吸收结合电化学氧化降解噻吩的混合过程。离子液体1-丁基-3-甲基咪唑鎓四氟硼酸盐（[BMIM] BF ₄）被用作吸收剂，从气流中捕获噻吩。表明，噻吩可以在被氧化β-PBO线性扫描伏安法（LSV）₂阳极改性用氟化物在1.28 V相对于银/ Ag +电极（RE）与100mV的扫描速率/ s，而[BMIM] BF ₄被用作电解质。本体电解的结果表明，噻吩可以彻底在60分钟内在[BMIM] BF降解₄在50毫安/厘米²，由于通过电解的表面上产生羟基自由基（·OH）的连续攻击β-PBO ₂阳极。乙酸被确定为主要中间体，可以进一步矿化为富马酸，马来酸和草酸，而噻吩中的硫原子最终转化为硫酸根离子（SO ₄ ^2-）。基于HPLC分析和BaSO ₄沉淀提出了噻吩的降解途径，可以将噻吩中的硫完全降解为硫酸盐。噻吩的电化学氧化过程的动力学可以通过拟一阶模型来描述。这种连续运行的吸收电化学氧化方法将是从废气中清洁安全地去除杂芳族化合物的一种有前途的方法。