Influence of sodium dodecyl sulfate coating on adsorption of methylene blue by biochar from aqueous solution
Influence of sodium dodecyl sulfate coating on adsorption of methylene blue by biochar from aqueous solution
复制标题
十二烷基硫酸钠涂层对生物炭吸附水溶液中亚甲基蓝的影响
DOI：
10.1016/j.jes.2017.11.027
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发表时间：
2018-08-01
影响因子：
6.9
通讯作者：
Liu, Shaobo
中科院分区：
文献类型：
--
作者：
Que, Wei;Jiang, Luhua;Liu, Shaobo
生物炭由于其多功能性和可有效耦合不同性质而被认为是一类有前途的新型材料。随着环境中环境化学物质的引入，表面活性剂等环境化学物质会负载到释放的生物炭上，改变生物炭的物理化学特性和对污染物的吸附行为。将阴离子表面活性剂十二烷基硫酸钠（SDS）以不同的负载量包覆于生物炭表面。采用傅里叶变换红外光谱（FT-IR）、元素分析、zeta电位、BET比表面积和孔径分布等分析方法，研究了SDS负载量对生物炭理化性质的影响。结果表明，随着SDS负载量的增加，生物炭的孔径逐渐减小，这主要是由于表面吸附和孔堵塞的作用;随着SDS负载量的增加，生物炭零电荷点（pHPZC）的pH值逐渐降低。虽然表面包覆SDS的生物炭的孔径减小，其对亚甲基蓝（MB）的吸附能力显着增加。生物炭表面的SDS引入了官能团和负电荷，通过氢键和静电作用增强了生物炭对亚甲基蓝的吸附。研究结果有助于揭示阴离子表面活性剂影响生物炭吸附亚甲基蓝的机理。(C)2017中国科学院生态环境科学研究中心由爱思唯尔公司出版
Biochar is regarded as a promising new class of materials due to its multifunctional character and the possibility of effectively coupling different properties. With increasing introduction into the environment, environmental chemicals such as surfactants will load onto the released biochar and change its physicochemical characteristics and adsorption behavior toward pollutants. In this study, sodium dodecyl sulfate (SDS), as one type of anionic surfactant, was coated onto biochar with different loading amounts. The influence of SDS loading onto biochar's physicochemical properties were investigated by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis, zeta potential and Brunauer-Emmett-Teller (BET) surface area and pore size distribution analysis. Results showed that the pore size of the biochar decreased gradually with the increase of SDS loading because of the surface-adsorption and pore-blocking processes; the pH of the point of zero charge (pHPZC) decreased with increasing SDS loading. Although surface-coating with SDS decreased the pore size of the biochar, its adsorption capacity toward Methylene Blue (MB) significantly increased. The biochar-bound SDS introduced functional groups and negative charges to the biochar surface, which could thus enhance the adsorption of MB via hydrogen bonding and electrostatic interaction. The results can shed light on the underlying mechanism of the influence of anionic surfactants on the adsorption of MB by biochar. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.