Search

The aim of this article is to provide an effective catalyst for using photocatalytic technology to solve the antibiotic pollution. For this purpose, Bi 2 S 3 was loaded on the surface of MIL-88 (A) to prepare rod-shaped composite photocatalyst via a combination of low-temperature hydrothermal and low-temperature water bath methods. The prepared composite photocatalysts were characterized by using SEM, EDS, XRD, FT-IR, UV–vis and XPS. Tetracycline hydrochloride (TC) degradation under visible light was used to gauge the photocatalytic activity of the composite as it was created. The results show that the degradation efficiency of the optimum sample Bi 2 S 3 /MIL-88 (A)-0.2 to TC within 120 min in a 10 mg/L TC solution is as high as 93%, which is 5.74 and 4.39 times as high as that of pure MIL-88 (A) and Bi 2 S 3 , respectively. The increased photocatalytic activity is ascribed to the type II heterojunctions that develop between Bi 2 S 3 and MIL-88 (A), which contribute to increase the composite's specific surface area and separation efficiency of photogenerated carriers. Additionally, the possible photocatalytic mechanism of the composite photocatalyst is explored in detail by active species capture experiments, transient photovoltage electrochemical impedance spectroscopy and photoluminescence measurements. This research provides a new way to prepare MIL-88 (A)-based type II heterojunction photocatalysts. [Display omitted] • A novel photocatalyst B 2 S 3 /MIL-88(A) (BM) was prepared by an energy-saving method. • The prepared BM-0.2 has markedly enhanced degradation ability to TC. • The photocatalytic mechanism of BM-0.2 is studied in detail. [ABSTRACT FROM AUTHOR]

Abstract: To fully exploit the benefits of N-methylmorpholine-N-oxide (NMMO) in lignocelluloses bioconversion, a compatible system was established for efficient in situ saccharification of cellulose in NMMO-aqueous media in which the NMMO is able to activate and solubilize the cellulose, and the cellulases possess high stability and activity. Cellulase retained its original activity after being pre-incubated in 15% and 20% (w/v) NMMO solutions. After optimization of reaction parameters, high saccharification rate (96.5%) was obtained in aqueous-NMMO media by ultrasound assisted treatment of cellulose. The viscosity and FTIR analysis revealed that NMMO-treated cellulose under ultrasonic condition was porous and amorphous, which led to improved saccharification. The addition of trifle lignin in lower concentration improved the saccharification efficiency of sugarcane bagasse, while higher concentration interferes with hydrolysis. In conclusion, these findings provided great implications to develop a continuous process NMMO-cellulases system for transformation of native biomass. [Copyright &y& Elsevier]