水稻秸秆生物炭-过硫酸盐去除水中p-硝基酚

以水稻秸秆为原料制备了多种生物炭,运用BET和FTIR等技术对其进行了表征,研究了生物炭-过硫酸盐体系对水中p-硝基酚的去除效果。与热解温度和时间相比,供氧量对生物炭活化过硫酸盐性能的影响更为显著,足氧条件下的活化性能显著降低;500℃缺氧条件下热解1 h制备的生物炭(RS500-1)对过硫酸盐具有良好的活化性能,可以实现p-硝基酚的高效去除,生物炭与过硫酸盐之间存在显著的协同作用。初始溶液pH和反应温度对p-硝基酚的去除效果影响很小;在RS500-1投加量1.0 g/L、过硫酸盐投加量5 mmol/L、反应温度25℃、不调节初始溶液pH的优化条件下,240 min时p-硝基酚的去除率可达70%以上。

Degradation of p-nitrophenol using rice straw-based biochar and persulfate

A series of biochar was prepared from rice straw and characterized by BET and FTIR. The removal efficiency of p-nitrophenol in solution by biochar-persulfate was investigated. The effect of oxygen supply on activation capability of biochar to persulfate was more significant than those of pyrolysis temperature and pyrolysis time,and the activation capability of biochar was obviously decreased under aerobic condition;The biochar（RS500-1）prepared under the conditions of pyrolysis temperature 500 ℃,hypoxic environment and pyrolysis time 1 h exhibits good activation capability to persulfate,which could remove p-nitrophenol efficiently,and a synergistic effect existed between biochar and persulfate in the system. The effect of initial solution pH and reaction temperature on removal of p-nitrophenol was very weak;The removal rate of p-nitrophenol could reach more than 70% under the optimum conditions of RS500-1 amount 1.0 g/L,persulfate amount 5 mmol/L,reaction temperature 25 ℃,initial solution pH and reaction time 240 min.