Cobalt and nitrogen co-doped biochar enhanced peroxymonosulfate activation for Bisphenol A degradation
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摘要: 内分泌干扰物双酚A(Bisphenol A, BPA)在环境中对生态安全构成了潜在的威胁,因此需要寻找一种合适的处理方法。基于Co、N共掺杂材料具有反应活性高、化学稳定性高、去除污染物效率高等优势,本研究以杉木屑生物炭为原料进行Co、N共掺杂制备了具有高效PMS活化能力的钴、氮共掺杂生物炭(CoNC)复合材料,用以活化过一硫酸盐(Peroxymonosulphate, PMS)去除水体中BPA。相比于C、NC以及CoC,CoNC的表面粗糙程度增加,缺陷点位增多,电荷转移阻力减小,且结构比表面积与孔隙结构得到改善,比表面积达到70.31 m2 /g;对不同Co、N掺杂比、溶液初始pH、共存阴离子对BPA去除效率的影响进行了研究。结果表明,相比于原始材料,PMS/CoNC体系表现出优异的BPA去除能力。在溶液初始pH为7,CoNC投加量为0.2 g/L,PMS浓度为0.3 mmol/L,模拟水体中BPA浓度为20 mg/L的条件下,BPA去除率在30分钟达到95%。捕获实验、电化学表征表明,在PMS/CoNC体系中,BPA主要通过直接电荷转移的非自由基途径得到降解。本研究为生物炭催化性能的优化以及BPA在高级氧化技术中的降解研究提供借鉴。Abstract: The endocrine disruptor Bisphenol A(BPA) poses a potential threat to environmental ecological safety, for which a suitable treatment method needs to be found. Based on the advantages of high reactivity, chemical stability and pollutant removal efficiency of CoN co-doped material, CoN co-doped biochar(CoNC) composites with high PMS activation efficiency were prepared by Co and N co-doping with fir sawdust biochar as raw material. And the activation of peroxymonosulphate(PMS) by CoNC for the removal of BPA from environmental water has been investigated. Compared to C, NC, and CoC materials, CoNC showed improved surface roughness, more defect sites, reduced charge transfer resistance, and improved structural surface area and pore structure, with a specific surface area of 70.31 m2 /g. The effects of different Co and N doping ratios, initial solution pH, and co-existing anions on the removal efficiency of BPA were also investigated. The results showed that the PMS/CoNC system exhibited excellent BPA removal compared to the original material. Under the conditions of initial solution pH 7, 0.2 g/L CoNC material, 0.3 mmol/L PMS concentration, and BPA concentration of 20 mg/L in the simulated water, the BPA removal reached 95% in 30 min. The capture experiments and electrochemical characterization showed that PMS/CoNC degraded BPA mainly through the non-radical pathway of direct charge transfer. This study provides a reference for optimising the catalytic performance of biochar and its BPA degradation in advanced oxidation technology.
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Key words:
- Biochar /
- Co/N co-doping /
- Bisphenol A /
- Peroxymonosulfate /
- Non-radical pathway
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表 1 使用试剂名称以及试剂来源
Table 1. Name of used reagent and source of reagent
Sample Purity Producer Bisphenol A AR Shanghai, China Co(NO3)2•5H2O AR Guangdong, China Zn(NO3)2•6H2O AR Guangdong, China Dicyandiamide AR Guangdong, China Peroxymonosulphate AR Guangdong, China Methanol AR Shanghai, China
Shanghai, ChinaTert-Butanol AR 1,4-Benzoquinone AR Shanghai, China Furfuryl alcohol AR Shanghai, China 表 2 C、NC和CoNC的BET分析结果
Table 2. BET analysis of C、NC and CoNC
Sample Surface area/
(m2·g−1)Pore volume/
(cm3·g−1)Average pore
diameter /nmC 29.25 0.02 6.61 NC 42.67 0.19 13.11 CoNC 73.01 0.23 9.49 -
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