摘要
本研究以麦草秸秆为原料,通过水合热解法制备铁氮共掺杂生物炭(Fe-NBC),将其作为催化剂应用于过硫酸盐非均相高级氧化反应体系,处理造纸废水二沉池出水。结果表明,Fe-NBC表面孔隙丰富,在热解过程中生成石墨C、Fe、Fe-N和Fe-C;同时生成吡啶N、石墨N和吡咯N等,能够高效催化过硫酸盐产生氧化自由基,有效降低废水生化出水的COD浓度。在过硫酸盐用量4 mmol/L及FeNBC用量0.4 g/L、催化降解120 min时,COD_(Cr)从(123±1) mg/L降至(58±1) mg/L,去除率为52%。FeNBC经4次处理回用后,催化活性变化不大,仍保持对COD较高的去除率。
Iron-nitrogen co-doped biochar(Fe-NBC) was prepared by hydration pyrolysis with straw as raw material,and it was applied in persulfate heterogeneous advanced oxidation reaction system to treat the effluent of secondary sedimentation tank of papermaking wastewater.The results showed that the surface pores of Fe-NBC were abundant,and graphite C,Fe,Fe-N,and Fe-C,as well as pyridine N,graphite N and pyrrole N were formed during pyrolysis.Fe-NBC could efficiently catalyze persulfate to produce oxidized free radicals,thus effectively reducing the CODCr of biochemical effluent of wastewater.When the dosage of persulfate was 4 mmol/L and the dosage of Fe-NBC was 0.4 g/L,CODCr of the wastewater decreased from(123±1) mg/L to(58±1) mg/L after catalytic degradation for 120 min with the removal rate of 52%.The catalytic activity of Fe-NBC did not change much,and the removal rate of COD was still maintained after Fe-NBC reused for 4 time.
作者
冉虎
万金泉
张华林
葛强
王艳
RAN Hu;WAN Jinquan;ZHANG Hualin;GE Qiang;WANG Yan(Dongguan Jianhui Paper Industry Co.,Ltd.,Dongguan,Guangdong Province,523221;State Key Lab of Pulp and Paper Engineering,South China University of Technology,Guangzhou,Guangdong Province,510640;China CEC Engineering Corporation,Changsha,Hu’nan Province,410014)
出处
《中国造纸》
CAS
北大核心
2023年第7期41-48,共8页
China Pulp & Paper
关键词
铁氮共掺杂生物炭
过硫酸盐
非均相
造纸废水
iron-nitrogen co-doped biochar
persulfate
heterogeneous
papermaking wastewater
