A novel surface-oxidized rigid carbon foam with hierarchical macro-nanoporous structure for efficient removal of malachite green and lead ion  

作　　者：Qiyun Zhang Renquan Wu Yunhong Zhou Qilang Lin Changqing Fang 

机构地区：[1]College of Advanced Manufacturing,Fuzhou University,Jinjiang 362251,China [2]College of Materials Science and Engineering,Fuzhou University,Fuzhou 350116,China [3]Faculty of Printing,Packing Engineering and Digital Media Technology,Xi’an University of Technology,Xi’an 710048,China

出　　处：《Journal of Materials Science & Technology》2022年第8期15-28,共14页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51872049)。

摘　　要：This study developed a method to fabricate a surface-oxidized rigid carbon foam(ORCF)with hierarchical macro-nanoporous structure via KOH activation of the carbon foam with two kinds of macropores followed by HNO_(3) hydrothermal oxidation.The structures of the prepared ORCF were characterized using scanning electron microscopy,transmission electron microscopy,X-ray diffraction,Fourier transform infrared(FTIR)spectra,X-ray photoelectron spectroscopy,and N_(2) adsorption-desorption analyzer.Results demonstrate that the ORCF possesses a fluffy and porous structure with rich oxygen-containing groups.There are numerous through-holes on its pore surfaces connected with two-level macropores forming hierarchical macroporous channels.Meanwhile,the ORCF remains a good bulk structure with a compression strength of 0.74 MPa at a bulk density of 0.09 g cm^(−3).Batch adsorption experiments for malachite green(MG)and Pb^(2+) were studied through the single variable method to investigate the effects of different initial conditions on its adsorption process.The ORCF has maximum adsorption capacities for MG and Pb^(2+) of 587.68 mg g^(−1) and 157.80 mg g^(−1) with high partition coefficients of 17.41 mg g^(−1)μM^(−1) and 14.86 mg g^(−1)μM^(−1),respectively.The experimental data are suitable for Langmuir isotherm and Pseudo-secondorder kinetic models,which correspond to monolayer chemisorption.Thermodynamic analysis indicates that the adsorption process is spontaneous and endothermic.Moreover,the removal percentages of MG and Pb^(2+)by the ORCF could remain above 90%after five cycles,implying that the ORCF is an efficient adsorbent with good adsorption ability and cycling stability.

关 键 词：HNO3 oxidation Carbon foam Malachite green LEAD Adsorption 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]