蓝藻生物炭的制备及对过硫酸盐的活化效能

Preparation of Biochar From Cyanobacteria and Function of the Biochar for Persulfate Activation

以蓝藻为原料制备生物炭,将其作为过硫酸盐活化剂用于橙黄G的降解去除。考察了制备条件对生物炭元素组成、孔径结构及活化过硫酸盐性能的影响,研究了生物炭/过硫酸盐体系对橙黄G的降解过程及影响因素。结果表明,与氢氧化钠预处理相比,磷酸预处理后制得的生物炭碳元素含量高,孔径结构不发达,但对过硫酸盐活化性能优良。升高热解温度可以进一步提高生物炭的活化性能。采用磷酸预处理后在500℃条件下热解制得的生物炭(CHB500)具有非常好的过硫酸盐活化性能,CHB500/过硫酸盐体系可以在pH 2.7~10.7的范围内实现橙黄G的高效降解去除,该过程中自由基和非自由基机制共同发挥作用。

Biochar was prepared out of cyanobacteria and used as activator of persulfate in degrading Orange G. Effects of biochar preparation conditions on element composition,pore structure and persulfate activation perfor^nance of biochar were investigated. Orange G degradation process of the biochar-persulfate system and its influencing factors were studied. Results show that the biochar prepared out of H3PO4 treated cyanobacteria was higher in carbon content, less developed in pore structure and better in persulfate activation performance than that out of NaOH treated cyanobacteria. Higher pyrolysis tem-perature could improve activation performance of the biochar. The biochar obtained at 500 丈 out of H3 PO4 treated cya-nobacteria （CHB500） exhibited excellent activation performance. CHB500/persulfate system could efficiently degrade or remove Orange G in solutions with pH varying in the range from 2. 7 to 10. 7 with radical and non-radical mechanisms pla-ying a joint role.Key words： cyanobacteria; biochar; persulfate; Orange G