Oxidized g-C3N4/polyaniline nanofiber composite for the selective removal of hexavalent chromium

被引:90
作者
Kumar, Rajeev [1 ]
Barakat, M. A. [1 ,2 ]
Alseroury, F. A. [3 ]
机构
[1] King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Environm Sci, Jeddah 21589, Saudi Arabia
[2] Cent Met R&D Inst, Cairo 11421, Egypt
[3] King Abdulaziz Univ, Dept Phys, Fac Sci, Jeddah, Saudi Arabia
关键词
PERFORMANCE ELECTROCHEMICAL SUPERCAPACITOR; CARBON NITRIDE NANOSHEETS; SELF-ASSEMBLY BEHAVIOR; HEAVY-METAL IONS; AQUEOUS-SOLUTION; ADSORPTION; CR(VI); G-C3N4; WATER; FABRICATION;
D O I
10.1038/s41598-017-12850-1
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Nanomaterials with selective adsorption properties are in demand for environmental applications. Herein, acid etching and oxidative decomposition of melon units of graphitic carbon nitride (g-C3N4) was performed to obtain the oxidized graphitic carbon nitride (Ox-g-C3N4) nanosheets. Ox-g-C3N4 nanosheets were further decorated on the polyaniline nanofiber (Ox-g-C3N4/Pani-NF). Ox-g-C3N4/Pani-NF was well characterized and further applied for a selective removal of hexavalent chromium (Cr(VI)) form aqueous solution. The zeta potential analysis indicate that the surface of Ox-g-C3N4/Pani-NF was positively charged which could be beneficial to bind anionic Cr(VI) ions electrostatically. In addition, nitrogen and oxygen containing functional groups exist on the Ox-g-C3N4/Pani-NF were mainly responsible for adsorption of Cr(VI) ions from aqueous solution. Moreover, the adsorption of Cr(VI) ions was also dependent on solution pH, reaction temperature and initial concentration of Cr(VI) ions. The maximum monolayer adsorption capacity of Ox-g-C3N4/Pani-NF for Cr(VI), calculated from Langmuir isotherm was 178.57 mg/g at pH = 2 and 30 degrees C. The activation energy (Ea = -20.66 kJ/mol) and the enthalpy change (Delta H degrees = -22.055 kJ/mol) validate the role of physical forces in adsorption of Cr(VI). These results demonstrate that Ox-g-C3N4/Pani-NF can be used as a potential adsorbent for environmental remediation applications.
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页数:11
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共 56 条
[1]   Adsorption studies of Pb(II) and Cu(II) ions on mesoporous carbon nitride functionalized with melamine-based dendrimer amine [J].
Anbia, M. ;
Haqshenas, M. .
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 2015, 12 (08) :2649-2664
[2]   Simple and Large Scale Construction of MoS2-g-C3N4 Heterostructures Using Mechanochemistry for High Performance Electrochemical Supercapacitor and Visible Light Photocatalytic Applications [J].
Ansari, Sajid Ali ;
Cho, Moo Hwan .
SCIENTIFIC REPORTS, 2017, 7
[3]   Removal of hexavalent chromium from aqueous solution using polypyrrole-polyaniline nanofibers [J].
Bhaumik, Madhumita ;
Maity, Arjun ;
Srinivasu, V. V. ;
Onyango, Maurice S. .
CHEMICAL ENGINEERING JOURNAL, 2012, 181 :323-333
[4]   Surface Modification of C3N4 through Oxygen-Plasma Treatment: A Simple Way toward Excellent Hydrophilicity [J].
Bu, Xiuming ;
Li, Jipeng ;
Yang, Siwei ;
Sun, Jing ;
Deng, Yuan ;
Yang, Yuchen ;
Wang, Gang ;
Peng, Zheng ;
He, Peng ;
Wang, Xianying ;
Ding, Guqiao ;
Yang, Junhe ;
Xie, Xiaoming .
ACS APPLIED MATERIALS & INTERFACES, 2016, 8 (45) :31419-31425
[5]   g-C3N4-Based Photocatalysts for Hydrogen Generation [J].
Cao, Shaowen ;
Yu, Jiaguo .
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2014, 5 (12) :2101-2107
[6]   Photocatalytic removal of hexavalent chromium by newly designed and highly reductive TiO2 nanocrystals [J].
Chen, Gongde ;
Feng, Ji ;
Wang, Wenshou ;
Yin, Yadong ;
Liu, Haizhou .
WATER RESEARCH, 2017, 108 :383-390
[7]   The amphoteric properties of g-C3N4 nanosheets and fabrication of their relevant heterostructure photocatalysts by an electrostatic re-assembly route [J].
Cheng, Fuxing ;
Wang, Hainan ;
Dong, Xiaoping .
CHEMICAL COMMUNICATIONS, 2015, 51 (33) :7176-7179
[8]   Recent developments in polysaccharide-based materials used as adsorbents in wastewater treatment [J].
Crini, G .
PROGRESS IN POLYMER SCIENCE, 2005, 30 (01) :38-70
[9]   Selective removal of the heavy metal ions from waters and industrial wastewaters by ion-exchange method [J].
Dabrowski, A ;
Hubicki, Z ;
Podkoscielny, P ;
Robens, E .
CHEMOSPHERE, 2004, 56 (02) :91-106
[10]   X-ray photoelectron spectroscopy reference data for identification of the C3N4 phase in carbon-nitrogen films [J].
Dementjev, AP ;
de Graaf, A ;
van de Sanden, MCM ;
Maslakov, KI ;
Naumkin, AV ;
Serov, AA .
DIAMOND AND RELATED MATERIALS, 2000, 9 (11) :1904-1907