Functionalized carbon nanotubes for hydrocarbon removal from water

被引:35
作者
Al-Jammal, Noor [1 ]
Abdullah, Thamer Adnan [1 ]
Juzsakova, Tatjana [1 ]
Zsirka, Balazs [1 ]
Cretescu, Igor [2 ]
Vagvolgyi, Veronika [3 ]
Sebestyen, Viktor [1 ]
Cuong Le Phuoc [4 ]
Rasheed, Rashed T. [5 ]
Domokos, Endre [1 ]
机构
[1] Univ Pannonia, Inst Environm Engn, 10 Egyet St, H-8200 Veszprem, Hungary
[2] Gheorghe Asachi Tech Univ Iasi, Fac Chem Engn & Environm Protect, D Mangeron 73, Iasi 700050, Romania
[3] Univ Pannonia, Inst Chem, 10 Egyet St, H-8200 Veszprem, Hungary
[4] Univ Sci & Technol, Univ Danang, Fac Environm, Dept Environm Management, 54 Nguyen Luong Bang St, Danang 550000, Vietnam
[5] Univ Technol Baghdad, Dept Appl Sci Dept, Baghdad, Iraq
来源
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2020年 / 8卷 / 02期
关键词
Hydrocarbon contamination removal; Multiwalled carbon nanotubes; Functionalization of CNTs; OILY WASTE-WATER; AQUEOUS-SOLUTIONS; ACTIVATED CARBON; ADSORPTION; SORPTION; POLLUTANTS; MEMBRANES; KINETICS; SPONGES; SYSTEMS;
D O I
10.1016/j.jece.2019.103570
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study aims to develop advanced sorbents for the removal of hydrocarbons from surface waters. The microemulsion method was implemented to modify the surface structure of multiwalled carbon nanotube (MWCNTs) by attaching a hydrocarbon tail on its surface. The structural and surface chemistry properties of the prepared adsorbents were studied by different surface analytical techniques such as Brunauer-Emmett-Teller (BET) method, X-Ray diffraction (XRD), Raman-spectroscopy, Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TG). Scanning electron microscopy (SEM) was used to study the microstructure and morphology of the samples. Different model hydrocarbon compounds were used for this investigation. The hydrocarbon removal efficiencies of the unmodified and functionalized sorbents were studied by using total organic carbon analyzer (TOC), gas chromatography (GC), and UV-vis spectroscopy (UV-vis) techniques. Surface chemistry studies over raw and microemulsified multiwalled carbon nanotubes (mu EMWCNT) revealed that that microemulsion functionalization resulted in changes in the CH bending vibrations of the functionalized MWCNTs as compared to the raw MWCNTs, demonstrating the existence of intermolecular CH-p interactions between the carbon nanotubes and lauric/miristic acid. The experimental results revealed that microemulsion technique as a type of surface functionalization solved one main issue regarding MWCNTs modification as it proved to have a beneficial effect on MWCNTs' hydrophobic properties without the need for additional functionalization and substitution steps to attach hydrocarbon side chains. Using kerosene as a hydrocarbon model mixture, compared with raw MWCNTs, the maximum adsorption capacity of mu MWCNTs increased by 63.5 %. Additionally, the outcomes indicated that the n-octane adsorption capacities over mu EMWCNTs reached 6.07 g/g. The kinetic studies demonstrated that the adsorption process over mu MWCNTs could be well described by the pseudo-second-order model with a high correlation coefficient.
引用
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页数:13
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