Adsorption and heterogeneous Fenton degradation of 17α-methyltestosterone on nano Fe3O4/MWCNTs in aqueous solution
Adsorption and heterogeneous Fenton degradation of 17α-methyltestosterone on nano Fe3O4/MWCNTs in aqueous solution
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DOI：
10.1016/j.apcatb.2011.07.025
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发表时间：
2011-09-21
影响因子：
22.1
通讯作者：
Yang, Shaogui
中科院分区：
文献类型：
--
作者：
Hu, Xiaobin;Liu, Benzhi;Yang, Shaogui
制备了一种新型催化剂--反尖晶石型四氧化三铁纳米颗粒修饰多壁碳纳米管（Fe 3 O 4/MWCNTs），并将其应用于H2 O2存在下对微量人工雄激素17 α-甲基睾酮（MT）的吸附和降解。通过热碱溶液中Fe 2+的原位氧化，实现了四氧化三铁晶体在多壁碳纳米管上的有序生长。用BET对催化剂进行了表征。XRD、TEM、XPS和拉曼光谱。考察了初始pH值、催化剂负载量、氧化剂浓度和铁浸出对MT降解的影响。在间歇降解实验中，Fe 3 O 4/MWCNTs对MT的吸附能力和降解效率均高于裸Fe 3 O 4。在8.0 ~ 3.5的较宽pH范围内，降解率随初始pH的降低而增加。该催化剂具有稳定的催化活性、较好的机械稳定性和方便的回收利用。铁的浸出可忽略不计，表明重复使用的Fe 3 O 4/MWCNTs经受住了氧化。Fe 3 O 4/MWCNTs的降解效率提高可能与MWCNTs在活性中心附近富集微量MT分子有关。(C)2011 Elsevier B. V.版权所有
A novel catalyst, inverse-spinel ferroferric oxide nanoparticles decorated multiwalled carbon nanotubes (Fe3O4/MWCNTs) was successfully prepared, and applied for the adsorption and degradation of trace artificial androgen 17 alpha-methyltestosterone (MT) in the presence of H2O2. The regular growth of ferroferric oxide crystal on multiwalled carbon nanotubes was achieved by in situ oxidation of Fe2+ in hot alkaline solution. The catalyst was characterized by BET. XRD, TEM, XPS and Raman spectroscopy. The effects of initial pH, catalyst loading, oxidant concentration and iron leaching on the degradation of MT were investigated. The Fe3O4/MWCNTs showed higher ability of adsorption and degradation efficiency of MT than bare Fe3O4 in the batch degradation experiment. The degradation efficiencies increased with the initial pH decreasing in the wide pH range of 8.0-3.5. Further, the catalyst showed stable catalytic activity, fairly good mechanic stability and convenient recycling. Negligible iron leaching showed the reused Fe3O4/MWCNTs withstood the oxidation. The enhanced degradation efficiency of Fe3O4/MWCNTs may relate to the enrichment of trace MT molecules by MWCNTs in the vicinities of active sites. (C) 2011 Elsevier B.V. All rights