[논문]Nitrogen-doped carbon nanosheets from polyurethane foams and removal of Cr(VI)

Duan, Jiaqi; Zhang, Baohua; Fan, Huailin; Shen, Wenzhong; Qu, Shijie

doi:10.5714/cl.2017.22.060

Nitrogen-doped carbon nanosheets from polyurethane foams and removal of Cr(VI) 원문보기

Carbon letters, v.22, 2017년, pp.60 - 69

Duan, Jiaqi (Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University) , Zhang, Baohua (Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University) , Fan, Huailin (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences) , Shen, Wenzhong (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences) , Qu, Shijie (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences)

Abstract ▼ AI-Helper

Nitrogen-doped carbon nanosheets with a developed porous structure were prepared from polyurethane foams by hydrothermal carbonization following $ZnCl_2$ chemical activation. Scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, solid state $^{13}C$ nuclear magnetic resonance (NMR) spectra and X-ray photoelectron spectroscopy were used to characterize the nitrogen-doped carbon nanosheet structure and composition. The removal of Cr(VI) by the N-doped carbon nanosheets was investigated. The results showed that the maximum removal capacity for chromium of 188 mg/g was found at pH=2.0 with PHC-Z-3. pH had an important effect on Cr(VI) removal and the optimal pH was 2.0. Moreover, amino groups and carboxyl groups in the nitrogen-doped carbon nanosheet played important roles in Cr(VI) removal, and promoted the reduction of Cr(VI) to Cr(III).

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제안 방법

00 MHz. The experiments were conducted on a Bruker 4-mm double-resonance MAS probe at room temperature, and samples were filled in 4 mm cylindrical ZrO₂ rotors with a spinning frequency of 9 kHz. CP/ MAS procedure (cross-polarization/magic angle spinning) was employed for GlcNH2 and GlcNAc measurement, while the HPDEC procedure (high-power decoupling) was used for the residues collected at 750℃.

이론/모형

The scanning electron microscopy (SEM) images were obtained with an S-4800 field emission-scanning electron microscope (Hitachi, Japan) manipulated at 1 kV. Fourier transform infrared (FT-IR) spectra of the samples were obtained on a Nicolet FT-IR 380 spectrometer by the conventional KBr pellet technique. The thermogravimetric behavior of the sample was carried out under Ar flow from 30 to 800°C with a 10℃/min heating rate using a thermogravimetric analyzer (TG-DTA 8120; Rigaku, Japan).
99. Micropore volumes (V_micro) were calculated using the t-plot method. The scanning electron microscopy (SEM) images were obtained with an S-4800 field emission-scanning electron microscope (Hitachi, Japan) manipulated at 1 kV.
Nitrogen adsorption-desorption isotherms of the carbon materials were measured at –196℃ by a Micromeritics ASAP 2020 adsorption apparatus (USA). The adsorption branch isotherms were adopted to calculate the surface areas and pore size distributions of samples using the Brunauer-Emmett-Teller method (P/P₀ of 0.01 to 0.2) and non-local density functional theory method (slit pore model). The total pore volumes (V_total) were counted based on the adsorbed amount at a P/P₀ of 0.

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