Effects of the biochar aromaticity and molecular structures of the chlorinated organic compounds on the adsorption characteristics
Effects of the biochar aromaticity and molecular structures of the chlorinated organic compounds on the adsorption characteristics
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生物炭芳香性和氯化有机物分子结构对吸附特性的影响
DOI：
10.1007/s11356-016-8303-8
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发表时间：
2017-02-01
影响因子：
5.8
通讯作者：
Chen, Mengfang
中科院分区：
文献类型：
--
作者：
Han, Lu;Qian, Linbo;Chen, Mengfang
氯代有机化合物（COCs）的吸附行为（即，三氯乙烯（TCE）、1，2，4-三氯苯（1，2，4-TCB）、1，2-二氯苯（1，2-DCB）和一氯苯（MCB））。CS300、CS500、CS 700）的反应动力学模型分别为准一级动力学模型、双能双层模型和Freundlich模型。结果表明，一级吸附速率常数（k1= 0.06 <$0.51 h-1）与生物炭的高芳香性和/或低极性以及COCs的强疏水性成正比。COCs的饱和吸附量大小顺序为RH 500> CS500 > CS 700> CS300。RH 500由于其高的比表面积（SA）和总孔体积（TPV），对COCs表现出最高的吸附容量。然而，具有低SA和TPV发展的CS 500突出了芳香性和/或低极性对COCs吸附的重要作用。此外，1，2，4-TCB在所有生物炭上表现出最高的饱和吸附容量，其次是TCE，1，2-DCB和MCB。结果进一步揭示了物理性质（α、NM、ε1和ε2）、疏水性和静电力（即，吸附物与生物炭表面芳香族部分之间的π-π相互作用和电子给体-受体相互作用）对COCs吸附的影响。
Adsorption behaviors of the chlorinated organic compounds (COCs) (i.e., trichloroethylene (TCE), 1,2,4-trichlorobenzene (1,2,4-TCB); 1,2-dichlorobenzene (1,2-DCB); and monochlorobenzene (MCB)) by the commercial rice husk-based biochar (RH500) and the laboratory-prepared biochars from corn stalks under different pyrolytic temperatures (i.e., CS300, CS500, CS700) were examined and interpreted by the pseudo-first-order kinetic model, the double layer model with two energies, and the Freundlich model. It is identified that the first-order adsorption rate constants (k1= 0.06∼0.51 h−1) were proportional to the high aromaticity and/or low polarity of biochars and the strong hydrophobicity of the COCs. The saturated adsorption capacity for the COCs was followed by the order of RH500 > CS500 > CS700 > CS300. RH500 showed the highest adsorption capacity for the COCs due to its high surface area (SA) and total pore volume (TPV). However, CS500 with low SA and TPV development highlighted the important roles of the aromaticity and/or low polarity on the COCs adsorption. In addition, 1,2,4-TCB showed the highest saturated adsorption capacity on all biochars, followed by TCE, 1,2-DCB, and MCB. The results further revealed the positive effects of the physical properties (α,NM,ε1, andε2), the hydrophobicity and electrostatic forces (i.e., π-π interaction and electron donor-acceptor interaction) between the adsorbates and the aromatic moieties of biochar surfaces on the adsorption of COCs.