秦航道,肖榕,王勇,李慧.活性炭的表面性质对CeOx/AC催化臭氧氧化水中苯甲酸的影响机制[J].环境科学学报,2019,39(11):3786-3793
活性炭的表面性质对CeOx/AC催化臭氧氧化水中苯甲酸的影响机制
- Effect of activated carbon surface properties on catalytic ozonation of benzoic acid in water with CeOx/AC catalysts
- 基金项目：贵州省科技计划项目（No.黔科合基础[2017]1190）；贵州省科技计划项目（No.黔科合LH字[2017]7317号）
- 秦航道
- 铜仁学院材料与化学工程学院, 铜仁 554300
- 王勇
- 铜仁学院材料与化学工程学院, 铜仁 554300
- 李慧
- 铜仁学院材料与化学工程学院, 铜仁 554300
- 摘要：实验对活性炭（activated carbon，AC）进行了氧改性、氮改性、硫改性和氮-硫共改性，考查AC的表面性质对CeOx/AC催化臭氧氧化苯甲酸性能的影响.结果表明，相比氧改性活性炭ACO、硫改性活性炭ACS和氮改性活性炭ACN，氮-硫共改性活性炭ACNS由于含氮官能团和含硫官能团的引入，提高了对苯甲酸的吸附性能和催化臭氧氧化性能.采用氮-硫共改性活性炭为载体制备的CeOx/ACNS催化剂表面Ce3+含量最高，因而具有最高的催化活性，反应30 min，苯甲酸的去除率由单独臭氧氧化的22%提高到88%，TOC的去除率单独臭氧氧化的7%提高到55%.CeOx/ACNS催化剂具有良好的稳定性，循环使用6次，苯甲酸的去除率仅从88%降低到82%，整个过程中活性组分Ce的流失只占负载量的0.32%，是一种很有应用潜力的臭氧氧化催化剂.
- Abstract：To investigate the effect of surface property of AC on catalytic ozonation of benzoic acid, activated carbon was modified to obtain O-(ACO), N-(ACN), S-(ACS) and N, S-doped activated carbon (ACNS). The results show that ACNS enhanced the adsorption and catalytic ozonation of benzoic acid compared to ACO, ACN and ACS, owing to the introduction of N-containing and S-containing functional groups. CeOx/ACNS exhibits the highest Ce3+ content on catalyst surface and thus presents the optimal catalytic performance. The removal rate of benzoic acid and TOC were 22% and 7% by ozonation alone, while 88% and 55% by catalytic ozonation with CeOx/ACNS.The stability of CeOx/ACNS catalyst was good. A slight leaching of Ce took place, accounting for 0.32% of the total Ce supported on AC. CeOx/ACNS is a promising catalyst for catalytic ozonation.
