摘要
采用硝酸氧化联合高温处理法对活性炭(AC)进行表面改性(样品记为ACNH),并将其用于活化过硫酸盐(PS)降解苯酚.通过氮气等温吸附、元素分析、X射线光电子能谱和扫描电子显微镜等手段对改性前后活性炭的表面性质进行了表征分析.考察了活性炭投加量、PS/苯酚摩尔比、苯酚初始浓度和初始p H等条件对苯酚降解率的影响.结果表明,改性后活性炭活化PS能力显著提高,在ACNH/PS体系中苯酚的降解速率是AC0/PS体系中的5倍;ACNH的pH值适用范围宽;活性炭表面醌基、吡喃酮结构和碳原子平面层上的离域π电子(Cπ)在活化PS过程中起主要作用,而羧基起抑制作用.
Original activated carbon （AC0） was modified through nitric acid treatment followed by thermal annealing, as a result, ACNH was obtained. The activated carbon samples （ACs） were used to activate persulfate（PS） for phenol degradation. The ACs before and after modification were characterized by means of nitrogen adsorption isotherm, element analysis, X-ray photoelectron spectroscopy （XPS） and scanning electron microscopy（SEM）. Moreover, the effects of the operating conditions, including the dosage of ACNH, PS/ phenol mole ratio, the initial concentration of phenol and initial pH, on the phenol degradation in ACNH/PS system were also investigated. The results showed that the catalytic activity of activated carbon for PS activation was significantly enhanced after the modification, and the degradation rate of phenol in ACNH/PS system was 5 times faster than that in AC0/PS system. In addition, it was found that ACNH can be applicable to a wide pH range . The results also showed that C~, quinone and pyrone have a positive effect on the activation of PS while the carboxyl has an opposite effect.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第7期1241-1248,共8页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21507140)
山西省青年科技基金(批准号:2014021016-3)资助~~
关键词
表面改性
活性炭
过硫酸盐
含氧官能团
碱性位点
Surface modification
Activated carbon
Persulfate
Oxygen-containing functional group
Basic site
