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铁氮共掺杂生物炭催化过硫酸盐非均相深度处理造纸废水
Persulfate Heterogeneous Advanced Treatment of Papermaking Wastewater with Iron-nitrogen Co-doped Biochar Catalyst
收稿日期：2022-10-28  
DOI：10.11980/j.issn.0254-508X.2023.07.005
关键词:  铁氮共掺杂生物炭  过硫酸盐  非均相  造纸废水
Key Words:iron-nitrogen co-doped biochar  persulfate  heterogeneous  papermaking wastewater
基金项目:
作者单位邮编
冉虎* 东莞建晖纸业有限公司，广东东莞，523221 523221
万金泉* 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 510640
张华林 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 510640
葛强 中国轻工业长沙工程有限公司，湖南长沙，410014 410014
王艳 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 510640
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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Fe-NBC用量0.4 g/L、催化降解120 min时，CODCr从(123±1) mg/L降至(58±1) mg/L，去除率为52%。Fe-NBC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。
Abstract: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.
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