| 闵露娟,柳金明,张鹏,肖辉,孙红文.不同老化过程对生物炭理化性质及吸附邻苯二甲酸酯的影响[J].农业环境科学学报,2021,40(4):806-814. |
| 不同老化过程对生物炭理化性质及吸附邻苯二甲酸酯的影响 |
| Influences of different aging processes on biochar physicochemical properties and the adsorption of phthalic acid esters |
| 投稿时间：2020-09-21 |
| DOI：10.11654/jaes.2020-1105 |
| 中文关键词: 生物炭 水稻秸秆 老化 邻苯二甲酸酯 吸附 |
| 英文关键词: biochar rice straw aging phthalic acid esters adsorption |
| 基金项目:国家自然科学基金项目（42007320）；中国博士后科学基金项目（2019M651018）；天津市创新平台专项项目（19PTZWHZ00040）；天津市科技重大专项与工程项目（18ZXSZSF00110） |
| 作者 | 单位 | E-mail | | 闵露娟 | 环境污染过程与基准教育部重点实验室, 天津市城市环境污染诊断与修复技术工程中心, 南开大学环境科学与工程学院, 天津 300350 | | | 柳金明 | 环境污染过程与基准教育部重点实验室, 天津市城市环境污染诊断与修复技术工程中心, 南开大学环境科学与工程学院, 天津 300350 | | | 张鹏 | 环境污染过程与基准教育部重点实验室, 天津市城市环境污染诊断与修复技术工程中心, 南开大学环境科学与工程学院, 天津 300350 | nkzhangpeng@nankai.edu.cn | | 肖辉 | 天津市农业资源与环境研究所, 天津 300384 | | | 孙红文 | 环境污染过程与基准教育部重点实验室, 天津市城市环境污染诊断与修复技术工程中心, 南开大学环境科学与工程学院, 天津 300350 | |
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| 中文摘要: |
| 为明确农田常见土壤环境过程对生物炭的老化作用及吸附能力的影响，本研究以水稻秸秆为原材料，分别在300、500℃和700℃下限氧热解制备3种初级生物炭，并将其进行酸洗、氧化、水洗及根系分泌物老化等处理，研究不同环境过程对生物炭理化性质和其对邻苯二甲酸酯（PAEs）吸附能力的影响。结果表明：经强酸、H2O2、植物根系分泌物以及水洗等老化处理的生物炭无机组分比例均下降，引起有机组分比例增加，比表面积和总孔体积增大，且老化处理所引起的生物炭性质变化的程度为强酸>H2O2≈植物根系分泌物>水洗。初级和老化生物炭对邻苯二甲酸二乙酯（DEP）和邻苯二甲酸二丁酯（DBP）的等温吸附线均符合Freundlich模型，且对DBP的吸附能力均强于DEP。老化处理显著提高了中高温生物炭（500℃和700℃）对PAEs的吸附，且强酸老化效果显著强于H2O2、植物根系分泌物及水等老化处理，这是由于中高温生物炭中高含量无机组分易被酸洗去除并释放一部分有机吸附位点和被堵塞的孔道，增加了PAEs吸附位点的可及性。因此，中高温生物炭对水体和土壤中常见塑化剂具有更强的吸附固定潜力，在使用时需要综合考虑其土壤环境过程和理化性质以及目标污染物，以引导生物炭技术的健康发展。 |
| 英文摘要: |
| To determine the effect of common aging processes on biochars in the agricultural soil environment and their influence on the adsorption capacity of the biochars, three original biochars by pyrolyzing rice straw at pyrolysis temperatures(PTs) of 300, 500 and 700℃ under limited oxygen were prepared. The biochars were further aged by water aging, root secretion aging, H2O2 oxidation aging, and acid aging, and their physicochemical properties and the adsorption capacity to two phthalic acid esters(PAEs), diethyl phthalate(DEP) and dibutyl phthalate(DBP), were analyzed. The results showed that the four aging treatments all increased the organic component proportions, specific surface areas, and total pore volumes of the biochars, but decreased the inorganic component proportions. Such effects were increased by aging processes in the following order:acid aging > H2O2 oxidation aging ≈ root secretion aging>water aging. The adsorption well followed the Freundlich model and was higher for DBP than for DEP. The aging treatments all significantly increased the adsorption capacities of moderate- and high-PT biochars(500℃ and 700℃) to PAEs and acid aging was more efficient than the other three aging treatments. This was due to the high proportion of inorganic components in the moderate- and high-PT biochars, which could be easily removed by acid aging, releasing part of the organic adsorption sites and pores, and then increasing the accessibility of adsorption sites for PAEs. Therefore, the biochars prepared at medium-and high-PTs have a strong potential to adsorb DBP and DEP, the most common plasticizers in water and soils. Their application needs to consider the aging process in the soil environment and their physicochemical properties, as well as the targeted pollutants to guide the healthy development of biochar technology. |
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