碳化温度对猪骨炭结构及四环素催化降解性能的影响机制  

Mechanism for the effects of carbonization temperature on the structure of pig bone biochar and tetracycline catalytic degradation performance

作　　者：夏旭 李坤权[1] XIA Xu;LI Kunquan(College of Engineering,Nanjing Agricultural University,Nanjing 210031,China)

机构地区：[1]南京农业大学工学院,南京210031

出　　处：《农业工程学报》2023年第8期231-238,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(21876086);江苏省重点研发计划项目(BE2018708)。

摘　　要：针对碳化温度对猪骨炭(black pig biochar,BPBC)物化结构变化、活性位形成和催化降解四环素(tetracycline,TC)影响机制不清的问题,该研究以富含钙磷无机模板的厨余猪骨为原料通过高温缺氧一步碳化法制备了高催化活性多孔猪骨炭,采用现代能谱和低温N_(2)吸脱附等技术考察了碳化温度对BPBC形貌、活性矿晶、官能团结构和TC催化降解性能的影响及机制。结果表明,BPBC物化结构及其对TC的催化降解性能随碳化温度变化明显,在500、700和900℃3个不同碳化温度下制备的BPBC(500BPBC、700BPBC、900BPBC),分别呈现层状裂缝、针状团簇和空心球3种明显不同的结构;碳框架中-OH、C=O、活性羟基磷灰石及比表面积随碳化温度升高先增加而后降低,BPBC对TC的降解性能比值为7.3∶10∶4.6,700BPBC催化性能最强;自由基清除试验分析表明,700BPBC碳框架上高活性的-OH、C=O和针簇状矿物晶体结构,能高效激活过硫酸盐通过自由基和非自由基双反应途径催化降解TC。该研究结果可为通过控制温度一步碳化定向合成具有高催化降解TC活性的高值BPBC提供数据支持和理论依据。Tetracycline(TC)can easily lead to persistent environmental toxicity via bio-enrichment effects,due to the inefficient bio-absorption,high solubility,and high bio-activity.Advanced oxidation processes based on sulfate radicals(SR-AOPs)can be expected to serve as an alternative means.Green low-cost biochar(BC)can be also used as an uneven catalyst.The persulfate(PS)was efficiently decomposed to generate the high-oxidation to restore power free radicals(OH,and SO4-·)during the degradation mineralization of organic matter.In addition,the annual waste bone production has reached 1348 tons in 2021 in China.Traditional treatments of waste bone can also be limited in the implementation conditions or cure such defects as bacterial reproduction.The waste bone can be prepared to catalyze the PS degradation TC.There are different properties of thermal temperature,crystallization,and surface shape made of BC,leading to the removal performance of pollutants.In this study,the different structures of pig bones coal with cooking pig bones were prepared as the raw materials at different temperatures of thermal resolution from 500℃to 900℃.Energy spectroscopy was selected to analyze the effect of heat resolution on the pig bone's carbon shape,active phosphorus(hydroxyapatite,HAP)crystal structure,oxygenic acid,as well as the active functional units and cavity structure.Then,the material performance was compared to determine the optimal material pH,and PS parameters impact.The optimal system was achieved in the active oxygen sudden extinction to investigate the interaction between bone carbonization temperature and structure for the catalyst degradation performance.The results showed that there was a noticeable carbonization structure of the pig’s bone with the change in the carbonization temperature,indicating three distinct structures of layered cracks,needle-shaped clusters,and empty heart balls at three supply temperatures.Compared with 500℃and 900℃,the crystalline structure formed at 700℃,and the fully volatile org

关 键 词：温度 生物炭 pH值 猪骨炭 针簇状结构 四环素 去除机制 

分 类 号：X705[环境科学与工程—环境工程] S216.1[农业科学—农业机械化工程]