三氯生(TCS)引起的水污染对水生生态环境和人类健康造成威胁,光催化技术作为一种高效的三氯生处理方式受到研究者的青睐.采用尿素、粉煤灰与棉秆共热解制备 N 掺杂粉煤灰改性棉秆生物炭复合材料(N-FBC),用于催化降解三氯生.结果表明:N-FBC对三氯生光催化降解的一级动力学速率常数为 7.5×10-3 min-1,300 min后TCS去除率为89.5%.N-FBC经过 5次循环后,TCS去除率仍保持为69.5%.自由基猝灭结果表明,N-FBC复合材料主要依靠光生空穴(h+)对TCS进行降解.
Photocatalytic Degradation of Triclosan in Water over N-doped Fly Ash Modified Stalk Biochar Composite
Triclosan-induced water pollution poses a threat to aquatic ecosystems and human health,and photocatalytic technology has been favoured by researchers as an efficient way to treat triclosan.In this study,N-doped fly ash modified cotton stalk biochar composite(N-FBC)was prepared by co-pyrolysis of urea,fly ash and cotton stalks for catalytic degradation of triclosan.The results showed that the first-order kinetic rate constant for the photocatalytic degradation of triclosan by N-FBC was 7.5×10-3 min-1,and the removal rate of TCS was 89.5%after 300 min.The TCS removal rate of N-FBC remained at 69.5%after five cycles.The free radical burst results showed that the N-FBC composite mainly relied on photogenerated holes(h+)for TCS degradation.
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