Development of engineered natural organic sorbents for environmental applications. 2. Sorption characteristics and capacities with respect to phenanthrene.
Development of engineered natural organic sorbents for environmental applications. 2. Sorption characteristics and capacities with respect to phenanthrene.
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DOI：
10.1021/es051665
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发表时间：
2006-01
影响因子：
11.4
通讯作者：
Jixin Tang;W. Weber
中科院分区：
文献类型：
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作者：
Jixin Tang;W. Weber
系统研究了过热水处理对不同天然有机质源材料吸附菲的影响。吸附容量和随后的菲保留特性测试的所有有机材料显着增加过热水处理。温度对增强测试材料的吸附行为的影响大于处理时间、水分含量和矿物催化剂的存在。在250 ℃下处理5小时，水分含量为50%时，观察到最大的增强。强烈的相关性的吸附能力和等温线的非线性与加工温度，并与氧碳（O/C），芳香性和疏水性的加工材料的原子比进行了观察。吸附/解吸滞后指数的处理材料也线性增加与处理温度和O/C比。这与我们在本系列第一篇论文中提出的过热水处理过程中NOM的冷凝和芳构化增加的观察结果一致。所描述的关系提供了直接的实验证据表明，NOM地质吸附剂的吸附-解吸性能与其芳构化和冷凝程度密切相关，并且该工作表明了生产高效且具有成本效益的工程天然有机吸附剂用于环境应用的强大潜力。
The effects of superheated water processing on enhancement of phenanthrene sorption by various source materials of natural organic matter (NOM) were systematically examined. Sorption capacities and subsequent phenanthrene retention characteristics of all organic materials tested were markedly increased by superheated water processing. Temperature effects on enhancement of the sorption behaviors of the test materials were greater than those of processing time, moisture content, and the presence of mineral catalysts. Greatest enhancement was observed for processing at 250 degrees C for 5 h with a moisture content of 50%. Strong correlations of sorption capacities and isotherm nonlinearities with processing temperature, and with the atomic ratios of oxygen to carbon (O/C), aromaticity, and hydrophobicity of the processed materials were observed. The sorption/desorption hysteresis indices of the processed materials also increased linearly with processing temperatures and O/C ratios. This is consistent with our observations of increased condensation and aromatization of NOM during superheated water processing presented in the first paper of this series. The relationships described provide direct experimental evidence that the sorption-desorption properties of NOM geosorbents are closely related to their degree of aromatization and condensation, and the work suggests strong potential for production of efficient and cost-effective engineered natural organic sorbents for environmental applications.