Preparation and properties of a silver particle-coated and 1-dodecanethiol-modified superhydrophobic melamine sponge for oil/water separation

doi:10.1007/s11705-022-2140-8

Front. Chem. Sci. Eng.

2022, Vol. 16

Issue (8) : 1237-1246 https://doi.org/10.1007/s11705-022-2140-8

RESEARCH ARTICLE

Preparation and properties of a silver particle-coated and 1-dodecanethiol-modified superhydrophobic melamine sponge for oil/water separation

Xiaofei Sun, Shijie Feng, Zhe Zhang, Pengyu Zhang, Jiefeng Zhao, Yunling Gao(

), Junxian Yun(

)

State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, China

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Abstract

A Ag particle-coated and 1-dodecanethiol-modified melamine sponge (Ag-DDT-MS) was prepared through surface roughness by coating silver particles and subsequent grafting of a hydrophobic long hydrocarbon chain. Superhydrophobic and 3D porous Ag-DDT-MS was characterized by Fourier transform infrared spectroscopy, scanning electron microscope, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The water contact angle of Ag-DDT-MS reached 159.2°. Ag-DDT-MS exhibited excellent absorption capacity for high viscous oils and organic solvents, ranging from 42.8 to 105.2 g∙g⁻¹. The absorbed oils can be easily collected by the mechanical pressing process, and the oil recovery rate was satisfactory, more than 90% after 20 recycles. Ag-DDT-MS material also demonstrated good stability and excellent compression-recovery ability, keeping 88.6% of the initial height after ten compression-release cycles.

Keywords melamine sponge oil-absorbing material hydrophobic oil-water separation oil absorption capacity

Corresponding Author(s): Yunling Gao,Junxian Yun

Online First Date: 28 March 2022 Issue Date: 02 August 2022

Cite this article:

Xiaofei Sun,Shijie Feng,Zhe Zhang, et al. Preparation and properties of a silver particle-coated and 1-dodecanethiol-modified superhydrophobic melamine sponge for oil/water separation[J]. Front. Chem. Sci. Eng., 2022, 16(8): 1237-1246.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2140-8
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I8/1237

Scheme1 Schematic diagram of the preparation process of hydrophobic Ag-DDT-MS.

Fig.1 Scanning electron microscope images of (a–d) the initial sponges and (e–h) Ag-DDT-MS at different magnifications.

Fig.2 (a) FTIR of samples before and after modification; (b) EDS element analysis images of MS and Ag-DDT-MS; (c) XRD patterns of original MS and modified samples Ag-DDT-MS.

Fig.3 Compression-release ability of (a) unmodified MS and (b) modified hydrophobic Ag-DDT-MS.

Fig.4 Photographs of (a–c) the dynamic process of placing the pristine sponge on the water surface, (d) the modified sponge being placed on the water surface, (e) applying an external force to immerse the modified sponge in water, (f) the modified sponge floating up after releasing external forces, and water (blue), chloroform (red) and crude oil (black) droplets on (g) the original sponge surface, (h) Ag-MS sponge surface, and (i) Ag-DDT-MS sponge surface.

Fig.5 The dynamic process of dripping-adsorption: (a) water and (b) crude oil on the surface of the pristine sponge; (c) water and (d) crude oil on the surface of the modified sponge.

Fig.6 The corresponding water contact angles of (a) the original sponge (WAC = 0°), (b) Ag-MS (WAC = 112.5°), and (c) Ag-DDT-MS (WAC = 159.2°).

Fig.7 Absorbability of hydrophobic Ag-DDT-MS to (a) crude oil on water, (b) colza oil on water, and (c) chloroform underwater surface.

Fig.8 Pump-assisted continuous separation of crude oil on the water surface using Ag-DDT-MS.

Fig.9 The absorption capacity of hydrophobic Ag-DDT-MS for different oils and organic solvents.

Fig.10 Recyclability of Ag-DDT-MS for crude oil in cycling experiments, and diagram of (a) volume residual and (b) recovery; recyclability of Ag-DDT-MS for n-hexane in cycling experiments, and diagram of (c) volume residual and (d) recovery.

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