苯多酸分子标志物法对NaClO氧化前后生物炭的性质描述

doi:10.11896/cldb.18040085

材料导报

2019, Vol. 33

Issue (12): 2089-2094 https://doi.org/10.11896/cldb.18040085

高分子与聚合物基复合材料

苯多酸分子标志物法对NaClO氧化前后生物炭的性质描述

常兆峰¹, 田路萍², 梁妮¹, 张朋超¹, 周丹丹¹, 张军¹, 吴敏¹

1 昆明理工大学环境科学与工程学院,昆明 650500
2 云南省环境科学研究院,昆明 650500

Characterization of Biochar Properties Before and After NaClO Oxidation byMolecular Markers of Benzene Polycarboxylic Acids

CHANG Zhaofeng¹, TIAN Luping², LIANG Ni¹, ZHANG Pengchao¹, ZHOU Dandan¹, ZHANG Jun¹, WU Min1

1 Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500
2 Yunnan Institute of Environmental Science, Kunming 650500

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摘要以九种多环芳烃和四种纯化合物为例探究生物炭经HNO₃氧化生成苯多酸(BPCAs)的过程,证明BPCAs方法可以对环境中炭黑或高缩合度有机质进行相对定量和定性的描述。并以纤维素(CE)和木质素(LG)为原料,在不同温度下(0~500 ℃)制备生物炭,结合常规理化性质表征比较分析生物炭经NaClO氧化前后BPCAs信息的相关变化。结果表明,BPCAs总含量与苯六甲酸(B6CA)相对含量均随生物炭制备温度升高而增加,说明生物炭的缩合度随温度升高而变大且相同温度下木质素生物炭的缩合度高于纤维素生物炭。NaClO氧化导致生物炭1.8%~79.3%的BPCAs损失但各单体BPCA的百分含量并没有明显变化,证明NaClO氧化不会改变生物炭BPCAs的分布特征。苯五甲酸/苯六甲酸(B5CA/B6CA)和苯六甲酸/苯四甲酸(B6CA/B4CAs)作为辨析环境炭黑来源的特征值,氧化前后均指示相同的生物炭来源,表明BPCAs方法识别环境中生物炭来源具有高可靠性。

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关键词: 苯多酸分子标志物多环芳烃化学计量学生物炭次氯酸钠氧化

Abstract: Exemplified by nine polycyclic aromatic hydrocarbons (PAHs) and four pure compounds, the process of HNO₃ oxidation of biochar to produce benzene polycarboxylic acids (BPCAs) molecular markers was investigated. It had been proved that BPCAs could be adopted to describe the carbon black or condensed organic matter in the environment quantitatively and qualitatively. Then, biochar was prepared from cellulose (CE) and lignin (LG) at different temperatures (0—500 ℃). The variations of BPCAs information before and after NaClO oxidation were analyzed and compared by conventional physicochemical characterization. The results indicated that the total content of BPCAs and the relative content of benzene hexacarboxylic acid (B6CA) increased with the increasing preparation temperature of biochars, which meant that the condensation degree of biochar increased with the increasing temperature and the condensation degree of lignin biochar was higher than that of cellulose biochar at the same temperature. NaClO oxidation resulted in a BPCAs mass loss of 1.8%—79.3% in biochar, while there was no obvious change of BPCA proportion in each individual monomer, indicting that NaClO oxidation would not alter the distribution pattern of BPCAs in biochar. Both the ratios of benzene pentacarboxylic acid / benzene hexacarboxylic acid (B5CA/B6CA) and benzene hexacarboxylic acid / benzene tetracarboxylic acid (B6CA/B4CAs) were employed to discriminate the source of environmental carbon black, and the denoted same biochars sources before and after NaClO oxidation confirmed that BPCAs method is highly reliable in identifying biochar sources in the environment.

Key words: benzene polycarboxylic acid biomakers polycyclic aromatic hydrocarbons (PAHs) stoichiometry biochar sodium hypochlorite (NaClO) oxidation

发布日期: 2019-05-31

ZTFLH:

X13

基金资助: 国家自然科学基金(41663013;41473116)

通讯作者: minwup@hotmail.com

作者简介: 常兆峰,昆明理工大学博士研究生,2014年毕业于石河子大学化学化工学院,同年9月进入昆明理工大学环境科学与工程学院攻读硕士学位,2015年9月转为硕博连读生。主要研究方向为生物炭的制备及应用,土壤碳循环。至今,在国内外学术期刊发表论文8篇,其中SCI论文4篇,参与国家自然科学基金项目5项。吴敏,昆明理工大学教授,博士生导师。2005年在北京大学获得硕士学位,2012年在昆明理工大学获得博士学位,2014年至2015年在美国麻省大学从事博士后研究工作。主讲的双语课程“环境毒理学”入选为云南省双语示范课程。在近期的工作中重点关注有机污染物环境行为机理研究。主持3项国家自然科学基金,参与多项国家级、省部级项目,已发表论文60余篇,其中31篇被SCI收录,译著1部。

引用本文:

常兆峰, 田路萍, 梁妮, 张朋超, 周丹丹, 张军, 吴敏. 苯多酸分子标志物法对NaClO氧化前后生物炭的性质描述[J]. 材料导报, 2019, 33(12): 2089-2094.
CHANG Zhaofeng, TIAN Luping, LIANG Ni, ZHANG Pengchao, ZHOU Dandan, ZHANG Jun, WU Min1. Characterization of Biochar Properties Before and After NaClO Oxidation byMolecular Markers of Benzene Polycarboxylic Acids. Materials Reports, 2019, 33(12): 2089-2094.

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http://www.mater-rep.com/CN/10.11896/cldb.18040085 或 http://www.mater-rep.com/CN/Y2019/V33/I12/2089

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