秸秆生物炭活化过硫酸盐氧化降解苯酚

以苯酚为目标污染物，高粱秸秆生物炭（S-BC）作为催化剂研究其活化过硫酸盐（PS）降解苯酚的效果.对影响降解的因素（包括PS浓度、S-BC质量浓度、初始pH值以及自由基清除剂）进行探讨，同时研究了生物炭的重复使用效果.研究结果表明，S-BC/PS体系对苯酚的去除率显著高于单一S-BC和PS体系.在n（PS）：n（phenol）为50：1，S-BC质量浓度为1.5g/L，pH值为11的条件下，15h内苯酚的去除率高达99.7%；自由基清除剂（叔丁醇（TBA），甲醇（MeOH））测定·OH和SO₄^-·是苯酚降解的主要活性物种；S-BC重复使用4次时对苯酚的去除率仍能达到100%.综上所述，生物炭可作为一种高效催化剂活化过硫酸盐降解苯酚.

Straw biochar activated persulfate oxidation and degradation of phenol

Persulfate (PS) oxidative degradation of phenol in an aqueous solution was studied in the presence of sorghum-straw biochar (S-BC). The effects of critical parameters, including sodium persulfate (PS) concentration, dose of catalyst, and the initial pH, were investigated. The results show that the ratio of phenol degradation in S-BC/PS system is obviously better than those of single S-BC and PS. The maximum removal efficiency of phenol reached 99.7% with PS/phenol molar ratio of 50:1, S-BC dosage of 1.5g/L, initial pH of 11and reaction time of 15h. Radical mechanism was studied and two radical scavengers (methanol (MA), tert-butanol (TBA)) were used to determine the kind of major active species taking part in the degradation of phenol. Finally, the recovery performance of S-BC was studied through the S-BC reuse experiments. In summary, the method of activating PS with S-BC may offer great benefits in remediation of phenol-contaminated water.