Chemical Vapor Deposition Growth of MoS₂ on g-C₃N₄ Nanosheets for Efficient Removal of Tetracycline Hydrochloride

Abstract

MoS 2 was vertically grown on g-C 3 N 4 nanosheets by chemical vapor deposition to prepare nanocomposites named MS-CN samples. Because of a large-surface area of 545.2 m 2 •g −1 and a total pore volume of 1.7 cm 3 •g −1 , the sample MS-CN revealed fast and large adsorption capacity for tetracycline hydrochloride (TCH). The adsorption kinetics model proved that TCH could be rapidly adsorbed within 5 min, and chemical adsorption was dominant. For singlecomponent adsorption of TCH, the maximum adsorption capacity was ∼154 mg/g. The monolayer adsorption was carried out on the surface of MS-CN. Both of the film and intra-particle diffusion were considered as significant processes to facilitate adsorption. Thermodynamic parameters indicate that the adsorption of TCH is a spontaneous endothermic process. The adsorption of TCH was highly pH-dependent. The maximum adsorption capacity of TCH was obtained in the case of pH ∼ 7. After four adsorption and desorption cycles, MS-CN still maintained well-adsorption performance. Multiple adsorption mechanism, pore filling, electrostatic force, π−π conjugation, and hydrogen bonding interactions were studied. Because of fast adsorption, large adsorption capacity, and high stability, it is a promising adsorbent for antibiotics.

Recent advances in visible-light graphitic carbon nitride (g-C3N4) photocatalysts for chemical transformations

“…10 a The synthesis of hetero-structured composites by coupling g-C 3 N 4 with other semiconductors not only suppresses the recombination of photoinduced charges, but also endows the composites with enhanced properties or novel features as a result of their synergistic effects. 10 b Accordingly, the enlightened design of its structure at different levels can provide new insights into the creation of high-performance g-C 3 N 4 materials 11 a – f for the efficient conversion of solar energy.…”

Three-Dimensional Hierarchical Seaweed-Derived Carbonaceous Network with Designed g-C3N4 Nanosheets: Preparation and Mechanism Insight for 4-Nitrophenol Photoreduction

“…Owing to the rapid demand for energy and the concerning issue of environmental pollution, semiconductor photocatalysts have aroused widespread attention. − Among them, photocatalysts such as ZrO 2 , TiO 2 , SiC, and SnO 2 have attracted tremendous interest due to their low cost, environmental friendliness, nontoxicity, high stability, and excellent photocatalytic activity. − However, the limited photocatalytic activity under visible light and the complicated fabrication process restrict their large-scale applications. Therefore, many scientific researchers have concentrated on the development of efficient photocatalysts, which can directly decompose water or degrade environmental pollutants using solar energy. − In the past few years, g-C 3 N 4 has gained much attention as a typical metal-free semiconductor photocatalyst because of its widespread applications, such as removal of toxic heavy metal ions, degradation of dye pollutants, selective organic transformation to fine chemicals, and photocatalysis for hydrolytic hydrogen production. − …”

Construction of a binary S-scheme S-g-C3N4/Co-ZF heterojunction with enhanced spatial charge separation for sunlight-driven photocatalytic performance

“…[13][14][15] Organic pollutant elimination is a well-established potential of photon-initiated oxidation processes, notably photocatalysis. [16][17][18][19][20] This method's notable benets include the utilization of inexpensive photons, mild working temperatures, nontoxic photocatalysts, and full mineralization. [21][22][23][24][25][26] Light absorption, photocatalytic redox interactions with reactive radicals, and the separation and transport of the photogenerated electron-hole pair are generally the three key components of the photocatalytic process.…”