Synthesis of a magnetic ionic liquid ([C12mim]FeCl4) and its interactions with low-rank coal

• Autorzy: Li Zhihao , Liu Mingpu , Lin Mengyu , Ma Chuandong , He Meng , Wang Qingbiao , Yu Hao , Li Lin , You Xiaofang

Identyfikatory

DOI

10.37190/ppmp/122232

• Języki publikacji: EN

Abstrakty

EN

he large number of oxygen-containing functional groups present on the surface of low-grade coal contribute to its strong hydrophilic properties and rendering coal beneficiation by flotation challenging. In this study, a magnetic ionic liquid (IL), [C₁₂mim]FeCl₄, was developed as a green medium to treat low-rank coal. Notably, the IL can be recovered using a magnetic field. The interactions between the low-rank coal and the IL were analyzed, and the structure and properties of [C₁₂mim]FeCl₄ were characterized using Raman spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy, and vibrating-sample magnetometry. Moreover, the effects of the newly prepared IL on the wetting properties of low-rank coal were studied using water contact angle measurements. The contact angle of the coal sample treated with the IL increased initially but decreased with subsequent increase in treatment time, indicating a change in coal wettability with time. The results from FT-IR analysis show that the changes in contact angles may be attributed to the changes to the oxygen-containing functional groups at the coal surface upon interaction with the IL, where the content of oxygen-containing functional groups in the treated coal sample initially decreased but subsequently increased with increase in treatment time. X-ray photoelectron spectroscopy analysis confirmed these results. Thus, it can be concluded that [C₁₂mim]FeCl₄ initially destroys the oxygen-containing functional groups at the coal surface, resulting in an increase in the water-coal contact angle but subsequently promoting oxidation of the coal surface, hence causing a reduction in the contact angle.

Słowa kluczowe

EN

low-rank coal; magnetic IL; wettability; contact angle

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2020
• Tom: Vol. 56, iss. 3
• Strony: 566--578
• Opis fizyczny: Bibliogr. 41 poz., rys., tab., wykr.

Twórcy

autor

Li Zhihao

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

Liu Mingpu

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

Lin Mengyu

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

Ma Chuandong

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

He Meng

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

Wang Qingbiao

• National Engineering Laboratory for Coalmine Backfilling Mining, Shandong University of Science and Technology, Tai’an, Shandong 271019, China

autor

Yu Hao

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

Li Lin

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

autor

You Xiaofang

• College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

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Uwagi

This work was supported by SDUST Research Fund (Grant No. 2018TDJH101), Key Research and Development Project of Shandong (Grant No. 2019GGX103035), National Natural Science Foundation of China (Grant No. 51904174), Young Science and Technology Innovation Program of Shandong Province (Grant No. 2020KJD001), and Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team.