菌渣生物炭负载四氧化三铁催化降解罗丹明B

doi:10.19964/j.issn.1006-4990.2022-0370

摘要/Abstract

摘要：

考虑到催化剂载体的高成本，寻求廉价的载体制备方案合成催化剂具有重要意义。通过热解青霉素菌渣制备多孔生物炭载体，以共沉淀法负载四氧化三铁，合成催化剂Fe₃O₄@PRBC。通过SEM、XRD、FT-IR和孔隙结构分析对催化剂进行表征，并以罗丹明B（RhB）为目标降解污染物，考察了不同体系、催化剂用量、双氧水用量、溶液pH和RhB浓度对处理效果的影响。结果显示，四氧化三铁成功负载于生物炭上，Fe₃O₄@PRBC表面呈粗糙多孔状，比表面积达到1 210.54 m²/g。其中H₂O₂/Fe₃O₄@PRBC体系表现出突出的催化性能，当Fe₃O₄@PRBC用量为0.8 g/L、双氧水用量为30 mmol/L时、在pH=3~11时，RhB的降解率均超过90%。催化循环4次，降解率仍能达到90%。自由基淬灭实验显示，催化降解RhB的主要活性物质为·OH和·O₂^-。对实际印染废水进行类芬顿降解实验，COD去除率高于80%，色度去除率达到100%。

关键词: 生物炭, Fe₃O₄, 非均相芬顿, 罗丹明B, 青霉素菌渣

Abstract:

Considering the high cost of catalyst carriers，it is significant to seek cheap carrier preparation method for synthesizing catalysts.The porous biochar（PRBC） was prepared as the carrier by pyrolysis of penicillin residue，and Fe₃O₄@PRBC was synthesized by co-precipitation loaded with Fe₃O₄.The catalysts were characterized by SEM，XRD，FT-IR and pore structure analysis，and the effects of different systems，catalyst dosage，H₂O₂ dosage，solution pH and Rhodamine B（RhB） concentration on the treatment effect were investigated by using RhB as the target degradation pollutant.The results showed that Fe₃O₄ was successfully loaded on biochar，and the surface of Fe₃O₄@PRBC was rough and porous with a specific surface area of 1 210.54 m²/g.The H₂O₂/Fe₃O₄@PRBC system showed outstanding catalytic characteristics.When the dosage of Fe₃O₄@PRBC was 0.8 g/L，H₂O₂ dosage was 30 mmol/L，the degradation rate of RhB was exceeded 90% in the range of pH=3~11.After recycling for 4 times，the degradation rate could still reach 90%.The free radical quenching experiment showed that the main active substances that catalyzed the degradation of RhB were ·OH and ·O₂^-.The Fenton-like degradation test was carried out on actual printing and dyeing wastewater，the COD removal rate was higher than 80%，and the chromaticity removal rate reached 100%.

Key words: biochar, Fe₃O₄, heterogeneous Fenton, Rhodamine B, penicillin residue

中图分类号:

TQ138.11

刘蕊, 高玮, 张文静, 安鸿雪, 李再兴. 菌渣生物炭负载四氧化三铁催化降解罗丹明B[J]. 无机盐工业, 2023, 55(4): 111-119.

LIU Rui, GAO Wei, ZHANG Wenjing, AN Hongxue, LI Zaixing. Catalytic degradation of Rhodamine B by ferroferric oxide-loaded bacterial residue biochar[J]. Inorganic Chemicals Industry, 2023, 55(4): 111-119.

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样品	制备方法	反应条件	降解率/%	循环性能
Fe₃O₄@PRBC	青霉素菌渣热解制备生物炭、共沉淀法负载Fe₃O₄	pH=3、催化剂用量为0.8 g/L、H₂O₂用量为30 mmol/L	97.30	循环4次，降解率仍大于90%
磁性Fe₃O₄纳米微球^[34]	乙二醇溶剂热法制备Fe₃O₄微球	pH=3、催化剂用量为1.2 g/L、H₂O₂用量为140 mmol/L	接近完全去除	未研究
Fe₃O₄@NiSiO₃纳米颗粒^[35]	采用Ni刻蚀Fe₃O₄@SiO₂外壳制备 Fe₃O₄@NiSiO₃纳米颗粒	pH=5.5、催化剂用量为1.0 g/L、H₂O₂用量为2.50%	大于95	循环5次，未有明显下降
BC-FeOOH^[36]	水热法制备BC-FeOOH	催化剂用量为0.6 g/L、H₂O₂用量为10 mmol/L	达到90	循环3次，降解率在 80%左右
Fe⁰-MF-RGO^[37]	磁性还原氧化石墨烯负载零价纳米铁	pH=7、催化剂用量为1.0 g/L、H₂O₂用量为0.8 mmol/L	98.17	循环5次，降解率为 72.97%
Fe/SBA-15^[38]	以介孔二氧化硅SBA-15为载体，采用等体积浸渍法制备Fe/SBA-15	pH=5.4、催化剂用量为0.15 g/L、n（H₂O₂）/ n（Fe³⁺）=2 000	约93	循环6次，降解率维持在80%

编号	原水COD/（mol·L^-1）	出水COD/（mol·L^-1）	原水色度/（mg·L^-1）
水样1	495	95	65
水样2	506	92	66
水样3	489	66	62

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