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钴掺杂生物炭活化过硫酸盐特征及其对污染物降解的研究
Study on the Characteristics of Activated Peroxymonosulfate and Its Degradation of Pollutants by Cobalt-Doped Biochar

DOI: 10.12677/MS.2023.134041, PP. 358-367

Keywords: 污泥基生物炭，四氧化三钴，高级氧化，过硫酸盐，硫酸根自由基
Sludge Biochar, Cobalt Tetroxide, Advanced Oxidation Processes, Peroxymonosulfate, Sulfate Radical

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Abstract:

以污泥基生物炭和Co(NO3)2为原材料，采用共沉淀法制备了污泥基生物炭掺杂Co3O4 (BS-Co3O4)催化剂，用于活化过硫酸盐(PMS)降解四环素(TC)。通过SEM、TEM、XRD、N2吸附–脱附、XPS等表征方法，对BS-Co3O4的表面形态、晶体类型、比表面积和元素价态组成进行分析，系统研究了BS-Co3O4投加量、PMS投加量和pH对TC降解的影响，并通过重复性实验考察了材料的稳定性。结果表明，经生物炭改性后，BS-Co3O4的比表面积显著提升(从14.54 m2？g？1到111.92 m2？g？1)，其负载的Co3O4纳米颗粒的平均粒径减小，有利于活性位点的暴露，另一方面，改性后的BS-Co3O4中Co(II)的相对含量也得到提升，有利于Co(II)与Co(Ш)的氧化循环，从而显著改善了BS-Co3O4对PMS的活化性能。对于初始浓度为0.1 mmol？L？1的TC，BS-Co3O4的投加量为0.2 g？L？1，PMS的投加量为0.5 mmol？L？1，在60分钟内TC的去除率可达到93.15%。该体系有较宽的pH适用范围(pH = 3~11)。自由基淬灭实验结果表明，BS-Co3O4在活化PMS过程中，产生了\"\"，\"\" 和1O2等活性物种，其中\"\" 和1O2对TC的去除起主要作用。
Using sludge-based biochar and Co(NO3)2 as raw materials, a biochar-doped Co3O4 (BS-Co3O4) catalyst was prepared by coprecipitation method and used for the activation of peroxymonosulfate (PMS) to degrade tetracycline (TC). The surface morphology, crystal type, specific surface area and the valence of elements were characterized by SEM, XRD, N2 adsorption-desorption isotherms and XPS. The effects of BS-Co3O4 dosage, PMS dosage and pH on the degradation of TC in BS-Co3O4/PMS system were studied. The results showed that the surface of BS-Co3O4 was loose and porous and Co3O4 nanoparticles were uniformly dispersed in the biochar. The introduction of biochar significantly improved the specific surface area of the catalyst (from 14.54 m2？g？1 to 111.92 m2？g？1), reduced the particle size of

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