Sorption behavior and mechanism of organophosphate flame retardants on activated carbons
Sorption behavior and mechanism of organophosphate flame retardants on activated carbons
复制标题
有机磷阻燃剂在活性炭上的吸附行为及机理
DOI：
10.1016/j.cej.2017.09.085
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发表时间：
2018-01-15
影响因子：
15.1
通讯作者：
Yu, Gang
中科院分区：
文献类型：
--
作者：
Wang, Wei;Deng, Shubo;Yu, Gang
有机磷阻燃剂广泛存在于水环境中，但其吸附去除规律尚不清楚。首次研究了活性炭对水中有机磷农药的去除效果。研究了吸附动力学、活性炭特性、OPFR特性、溶液pH对吸附的影响、吸附机理及回用。吸附剂的粒径对吸附动力学和吸附容量有显著影响，粉末活性炭（PAC）比颗粒活性炭（GAC）更容易在颗粒内扩散，吸附速度更快，吸附容量更高。OPFRs在初始阶段的吸附动力学遵循颗粒内扩散控制吸附，分子大小和疏水性对吸附速率有很大影响。活性炭对OPFR的去除率高于活性炭，这是因为活性炭产生了更多的大孔，可用于OPFR的吸附。基于OPFR的吸附行为，疏水，静电，氢键，和p-p相互作用参与了吸附过程。此外，废活性炭可以成功地再生和重复使用至少4次，具有稳定的吸附能力。本研究表明，合适的活性炭在水或废水处理中去除OPFRs具有良好的应用前景。
Organophosphate flame retardants (OPFRs) are widely distributed in aquatic environment, but their adsorptive removal is not clear. For the first time, the removal of OPFRs from water using activated carbons (ACs) was investigated in this study. Adsorption kinetics, effects of activated carbon characteristics, OPFR property, and solution pH, as well as adsorption mechanism and reuse were studied. Adsorbent size significantly affected the adsorption kinetics and capacity, and powdered activated carbon (PAC) exhibited much faster sorption and higher sorption capacity than granular activated carbon (GAC) due to the easier intraparticle diffusion of OPFRs. The sorption kinetics of OPFRs at the initial stage followed the intraparticle diffusion-controlled adsorption, and the molecular size and hydrophobicity influenced greatly the sorption rate. The reactivated GAC exhibited higher OPFR removal than GAC because more enlarged pores were produced and available for OPFR sorption. Based on the sorption behavior of OPFRs, hydrophobic, electrostatic, hydrogen bonding, and p-p interactions were proposed to be involved in the sorption process. Additionally, the spent ACs could be successfully regenerated and reused at least four times with stable sorption capacity. This work indicated that the appropriate ACs have a promising application in the water or wastewater treatment for OPFRs removal.