摘要
以污水厂填埋污泥为原料,在不同热解温度下制备了污泥生物炭(SBC),发现SBC能够高效活化过一硫酸盐(PMS),促进罗丹明B(RhB)降解,且900℃下制备的SBC降解RhB的速率常数(0.071 min^(-1))分别为300和600℃下制备的SBC的7.1和4.7倍.SBC/PMS体系中RhB的降解速率随着PMS剂量(0.2~0.8 mmol·L^(-1))的增加逐渐增加,达到0.8 mmol·L^(-1)后,继续增加投加剂量(1.6~3.2 mmol·L^(-1))降解速率变化不明显;随着工作pH的提高(1~13),SBC/PMS体系中RhB的降解速率逐渐降低.光谱学分析显示,热解温度的升高会使官能团减少,提高SBC本身与PMS和RhB的电子传递速率,促进RhB高效降解.淬灭实验结果显示,SBC/PMS/RhB体系中产生的主要活性氧物种为~1O_(2),其浓度约为1.5×10^(-10)mol·L^(-1).本研究有望揭示SBC活化PMS处理难降解有机污染物的潜力,阐明SBC在高级氧化过程的主要催化机制.
Sludge biochar (SBC) was prepared under different pyrolysis temperatures by using landfill sludges from sewage plant as a raw material.The results demonstrated that SBC could efficiently promote rhodamine B (RhB) degradation during the activation of f permonosulfate (PMS).The pseudofirst-order kinetic rate constant (0.071 min^(-1)) of RhB degradation in the system mediated by SBC with the pyrolysis temperature of 900℃was 7.1 and4.7 folds higher than those in systems mediated by SBC with the pyrolysis temperatures of 300 and 600℃,respectively.The degradation rate of RhB in the SBC/PMS system increased with the increase of PMS dosages from 0.2 to 0.8 mmol·L^(-1),and remained stable with the PMS concentrations at 0.2~3.2mmol·L^(-1).With the increase of operating pH (1~13),the degradation rate of RhB in the SBC/PMS systems gradually decreased.Spectroscopic analysis showed that the increase of pyrolysis temperature would reduce the contents of functional groups,increase the electron transfer rate between SBC and PMS and RhB,and promote the degradation of RhB.Quenching experiments demonstrated that the main reactive oxygen species in the SBC/PMS/RhB system was ~1O_(2) (1.5×10^(-10) mol·L^(-1)).This study reveal the potential of SBC during the activation of PMS for the degradation of refractory organic pollutants,and elucidate the main catalytic mechanism of SBC in advanced oxidation processes.
作者
李高婷玥
郭海燕
于华莉
王连峰
史继诚
阎松
LI Gaotingyue;GUO Haiyan;YU Huali;WANG Lianfeng;SHI Jicheng;YAN Song(College of Environment and Chemical Engineering,Dalian Jiaotong University,Dalian 116024)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第4期48-60,共13页
Acta Scientiae Circumstantiae
基金
国家自然科学基金青年科学基金(No.42207288)
辽宁省自然科学基金(No.2023-BS-172)
大连市科技人才创新支持计划青年科技之星项目(No.2022RQ032)
海南省农林环境过程与生态调控重点实验室开放课题(No.AFEPER202201)。
