scholarly journals Photocatalytic Performance of Alkaline Activated Graphitic Carbon Nitride Under Blue LED Light

2021 ◽  
pp. X
Author(s):  
Yong OUYANG ◽  
Jianquan XU ◽  
Aiyu YANG ◽  
Caixia ZHONG ◽  
Wenjing HU ◽  
...  
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Active Sites ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Organic Dyes ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Simple Method ◽  
Carrier Recombination

Graphitic carbon nitride (g-C3N4) is a metal-free photocatalyst with visible light response. However, the disadvantages limit its application in a wider range, such as its small specific surface areas, fewer active sites, narrow visible light absorption range and high photogenic carrier recombination. In this paper, NaOH was used as activator for alkaline activation of g-C3N4. The phase composition, micromorphology, surface chemical state and optical properties of g-C3N4 after activation were tested. The photocatalytic performance of g-C3N4 over organic dyes was also tested. The results showed that Na+ entered the interlayers of g-C3N4, expanding the spaces between layers. The specific surface area and pore volume of powder were increased. The active sites were increased. The band gap was decreased, and the photogenic carrier recombination was reduced. Alkaline activated g-C3N4 had better adsorption and degradation performance over rhodamine B and methyl orange than inactivated g-C3N4. Therefore, the alkaline activated g-C3N4 promotes its further application in the field of wastewater treatment. This work sheds light on the material modification through a simple method with the aim to efficiently use solar energy.

Preparation of Nitrogen-Deficient Graphitic Carbon Nitride with a Large Specific Surface Area by Melt Pretreatment and Its Photocatalytic Performance

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050079
Author(s):  
Xuelei Li ◽  
Jinfeng Bai ◽  
Jiaqi Li ◽  
Chao Li ◽  
Junru Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Mesoporous Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Large Specific Surface Area ◽  
X Ray

In this study, nitrogen-deficient graphitic carbon nitride (M-LS-g-C3N4) with a mesoporous structure and a large specific surface area was obtained by calcination after melt pretreatment using urea as a precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption, X-ray photoelectron spectroscopy (XPS), UV-Vis, ESR and photoluminescence (PL) were used to characterize the structure, morphology and optical performance of the samples. The TEM results showed the formation of a mesoporous structure on the 0.1[Formula: see text]M-LS-g-C3N4 surface. The porous structure led to an increase in the specific surface area from 41.5[Formula: see text]m2/g to 124.3[Formula: see text]m2/g. The UV-Vis results showed that nitrogen vacancies generated during the modification process reduced the band gap of g-C3N4 and improved the visible light absorption. The PL spectra showed that the nitrogen defects promoted the separation of photogenerated electron–hole pairs. In the visible light degradation of methyl orange (MO), the reaction rate constant of 0.1[Formula: see text]M-LS-g-C3N4 reached 0.0086[Formula: see text][Formula: see text], which was 5.05 times that of pure g-C3N4. Superoxide radicals and photogenerated holes were found to be the main active species in the reaction system. This study provides an efficient, green and convenient means of preparing graphitic carbon nitride with a large specific surface area.

scholarly journals Graphitic carbon nitride nanosheets obtained by liquid stripping as efficient photocatalysts under visible light

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37185-37193 ◽  
Author(s):  
Chengkong Fan ◽  
Jilin Miao ◽  
Guangqing Xu ◽  
Jiaqin Liu ◽  
Jun Lv ◽  
...  
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Carbon Nitride Nanosheets

Well-scattered g-C3N4 nanosheets obtained using a liquid stripping possess much higher photocatalytic performance than bulk g-C3N4.

Construction of Bi2MoO6/g-C3N4 heterostructure with enhanced visible light photocatalytic performance

2021 ◽  
Author(s):  
Guangxin Zhang ◽  
Jianguang Fang ◽  
Haoran Xu ◽  
Jingmiao Hu
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Separation Efficiency ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Bismuth Molybdate ◽  
Visible Light Photocatalytic

To improve the separation efficiency of photogenerated carriers, heterogeneous photocatalysts were prepared and characterized in this work. Firstly, graphitic carbon nitride (g-C3N4) and bismuth molybdate (Bi2MoO6) were synthesized by thermal...

scholarly journals Enhanced visible-light-driven photocatalytic performance of porous graphitic carbon nitride

2015 ◽  
Vol 358 ◽  
pp. 270-277 ◽  
Author(s):  
Fei Chang ◽  
Chenlu Li ◽  
Jieru Luo ◽  
Yunchao Xie ◽  
Baoqing Deng ◽  
...  
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Porous Graphitic Carbon ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Visible Light Driven

scholarly journals Porous g-C3N4 with defects for the efficient Dye photodegradation under visible light

2021 ◽  
Author(s):  
Jing Chen ◽  
Yage Zhang ◽  
Baofan Wu ◽  
Zhichao Ning ◽  
Miaoyan Song ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Methyl Orange ◽  
Visible Light ◽  
Active Sites ◽  
Carbon Nitride ◽  
Narrow Band ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Electron Hole ◽  
High Durability

Abstract Porous graphitic carbon nitride (p-C3N4) was fabricated via simply pyrolyzing treatment of graphitic carbon nitride (g-C3N4). The defects could be introduced into the structure of g-C3N4 by the broken of some bonds, which was beneficial for the generation of electron-hole pairs and restraining their recombination. Compared with g-C3N4, p-C3N4 showed a narrow band gap to promote the utilization of visible light. Furthermore, the porous structure also increased the specific surface area to maximize the exposure of active sites and promote the mass transfer during photodegradation. As a result, the as-reported p-C3N4 exhibited considerably higher degradation efficiency for Rhodamine B (RhB) and Methyl Orange (MO) than that of pristine g-C3N4. Moreover, the photocatalyst showed high durability and stability in recycling experiments.

Sign in / Sign up

Export Citation Format

Share Document