Facile Preparation of Hierarchically Porous g‐C₃N₄ as High‐Performance Photocatalyst for Degradation of Methyl Violet Dye

Abstract

Porous Graphitic carbon nitride(pg-C 3 N 4 ) possessing hierarchical pores and lamellar nanostrucutres was synthesized in the absent of templates by pyrolysis of the solution-assisted mixing dual-precursors. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N 2 porosimeter, X-ray photoelectron spectroscopy, UV-Vis andphotoluminescence spectroscopy.The photocatalytic activities of as-prepared materials for degradation of methyl violet were studied. The results show that the as-prepared g-C 3 N 4 consists of well-dispersed layers with uniform sizeand hierarchical (Meso/Macro) pores in the nanosheets, which favor photogenerated electron-hole pairs'separation, and the degradation of methyl violet conforms to the quasi-first-order kinetic model. The porous g-C 3 N 4 synthesized by optimizing precursors' ratios exhibited faster degradation rate than g-CN material in the process of photocatalyzing methyl violet andthe degradation rate was over 93 % after irradiation of 180 min, implying that the as-prepared hierarchically porous g-C 3 N 4 is a high-effective and metal-free photocatalytic material for degradation of pollutants.

Construction of yolk‐shell structural polydopamine@WO3 micro/nanospheres for enhanced photocatalytic degradation

“…To determine the main reactive species in photocatalytic degradation, the active species trapping experiments are performed by adding isopropanol (IPA), benzoquinone (BQ) and AgNO 3 and ethylene diamine tetraacetic acid (EDTA) in MB solutions, which can act as scavenger of hydroxyl radicals (∫OH), superoxide radicals (∫O 2 − ), electronics (e − ), and holes (h + ), respectively [41–43] . In Figures 6a and b, no significant change in the degradation rate of MB is observed (Figure 6a), and removal efficiency declined only from 80.2 to 66.7 % after adding 1 m M IPA (Figure 6b), which implies that ∫OH is not the main active specie.…”

Mn‐Dependent Morphology and Structure of SnS2 Nanosheets and the Photocatalytic Performance

“…As observed from Figure S4a, the absorption edges of MTS shift apparently in the 300-700 nm region, indicating that Mn element is doped into the crystal structure of SnS 2 , [29] which is in agreement with the XRD analysis. Based on UV-vis DRS results of different TS materials (Figure S4a and S5a), E g can be ChemistrySelect estimated by plotting (αhv) 2 to hv in term of the photoelectric effect formula,…”

“…Currently, environmental pollution has brought serious problems threatening human life and health, [1] in which industrial wastewater, such as print and dye, is main pollution source. [2] For example, methyl violet (MV) and rhodamine B are widely used in textile, pharmaceutical, and biological dyes [3,4] and they are recognized as a carcinogenic and mutagenic agent to living organisms. [5,6] Thus, it is necessary to remove methyl violet from wastewater by simple and high-efficient route such as photocatalytic technology.…”

Modulation and self-assembly of nanoparticles into bismuth molybdate nanosheets as highly efficient photocatalysts for ciprofloxacin degradation

“…For comparison, the removal of pollutants by photocatalysis is a promising route due to the low cost, energy economy and environmental friendliness. [5][6][7] More importantly, refractory organic compounds can be degraded into small molecules by photocatalysis. Therefore, it is of great significance to develop high-performance photocatalysts.…”