Adsorption behavior and XPS analysis of nonylphenol ethoxylate on low rank coal

• Autorzy: You Xiaofang , Ma Chuandong , Li Zhihao , Lyu Xianjun , Li Lin

Identyfikatory

DOI

10.5277/ppmp18190

• Języki publikacji: EN

Abstrakty

EN

In this work, low rank coal was used for the removal of nonylphenol ethoxylate with fifteen ethylene oxide groups (NPEO15) from aqueous solutions at different contact times, temperatures, and initial adsorbent concentrations. The adsorption isotherms showed good fit with the Langmuir equation. Maximum adsorption capacities calculated at 308, 318, and 328 K were 23.64, 29.41, and 35.71 mg g–1, respectively. The changes in the free energy of adsorption (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were calculated in order to predict the nature of adsorption. The results of the thermodynamic analysis indicated that a spontaneous process took place, driven synergistically by both enthalpy and entropy. The adsorption kinetics of NPEO15 were consistent with a pseudo-second order reaction model. XPS results showed that the oxygen functional groups on the low rank coal surface were significantly covered by NPEO15. Furthermore, while the content of C–C/C–H functional groups increased significantly, that of C–O functional groups decreased after absorption. These results clearly indicate that low rank coal is more hydrophobic and displays better floatability.

Słowa kluczowe

EN

low rank coal; nonylphenol ethoxylate; adsorption isotherm; adsorption kinetics; XPS

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 3
• Strony: 721--731
• Opis fizyczny: Bibliogr. 42 poz., rys. kolor.

Twórcy

autor

You Xiaofang

• Shandong University of Science and Technology

autor

Ma Chuandong

• Shandong University of Science and Technology

autor

Li Zhihao

• Shandong University of Science and Technology

autor

Lyu Xianjun

• Shandong University of Science and Technology

autor

Li Lin

• Shandong University of Science and Technology, No. 579, Qianwangang Road, Economics and Technology Development Zone, 266590 Qingdao, China

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