巯基功能化活性炭对汞离子的吸附性能研究及机理初探

Preparation and properties of thiol-functionalized activated carbon for selective removal of mercury(Ⅱ) ions

以活性炭为基体,利用γ-巯丙基三甲氧基硅烷(TMMPS)为改性剂对其进行巯基改性,获得了新型除汞材料巯基功能化活性炭(SFAC)。采用SEM-EDS、FT-IR对材料进行表征,结果表明—SH成功被引入到活性炭表面。吸附等温线研究表明改性后活性炭(SFAC)的吸附容量高达472 mg/g,较原活性炭(AC)提高了近1倍。针对高酸性的PVC含汞废水环境,模拟考察了溶液酸度对材料吸附性能的影响,结果表明SFAC在高酸[w(HCl)=31%]下,材料仍能稳定存在,并保持一定的吸附能力,表明材料有很强的耐酸性。同时开展材料对汞离子的吸附动力学研究,初步探讨Hg2+在SFAC上的吸附机理。

A novel thiol-functionalized activated carbon material （SFAC） is prepared by modification with 3-mercaptopropyl trimethoxysilane （TMMPS） on the activated carbon substrate.The SEM-EDS and Fourier transform infrared spectroscopy （FT-IR） are used to characterize the composite,which indicate that-SH is introduced into the surface of activated carbon.The study of adsorption isotherm indicates that the maximum adsorption capacity of SFAC can reach 472 mg/g,which is twice that of AC.For the condition of mercury-containing PVC waste with high acid,the effects of acidity on the adsorption process are investigated.The results show that SFAC still kept stable and a certain adsorptive capacity in the high-acid[w（HCl） =31％] condition.At the same time,adsorption kinetic is studied to explore the mechanism of adsorption.