Nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and preparation method thereof

Abstract

The invention provides a nano-mesoporous micro-spherical Ln-Bi5O7I photocatalyst and a preparation method thereof. The nano-mesoporous micro-spherical photocatalyst is 15-30 nm in surface mesopore diameter, is 1-5 [mu]m in average particle size and has an orthorhombic crystal form, wherein nBi + Ln : nI = 0.85-1:1, and nLn : nBi = 0.01-0.055:1. The preparation method includes the steps of: dissolving a bismuth salt, an iodine salt and nitrate containing rare earth ions respectively in certain-quantity ethylene glycol, performing ultrasonic oscillation, adding the rare earth ion solution to the bismuth-containing solution, adding the iodine-containing solution, and performing magnetic stirring to form a precursor Ln-BiOI; performing a hydrothermal reaction to the precursor to prepare Ln-BiOI powder; and maintaining the temperature of the Ln-BiOI at 425-525 DEG C to prepare the Ln-Bi5O7I powder. The Ln-Bi5O7I photocatalyst has homogeneous appearance, has large specific surface area, is strong in stability and has excellent photocatalytic performance in degradation of rhodamine B, methyl orange, phenol, bisphenol A and the like. The method combines advantages of both hydrothermal and thermal-decomposition methods.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials research, and specifically designs a kind of 3+ 、Er 3+ , La 3+ 、Nd 3+ ) of nano-mesoporous microspheres Ln-Bi 5 o 7 I photocatalyst and hydrothermal-pyrolysis preparation method thereof. Background technique [0002] In recent years, various toxic and harmful synthetic dyes, such as rhodamine B, methylene blue and methyl orange, have been widely used in textile, printing, dyeing and food industries. Serious pollution, and a threat to human health. Due to its low energy consumption, mild purification conditions, and no secondary pollution, photocatalytic technology has attracted the attention of many researchers. Therefore, many semiconductor photocatalytic materials have been widely developed and utilized in the degradation and mineralization of organic dyes. But there are still many other pollutants, such as bisphenol A, phenol, dichlorophenol, etc., due to their unique m...

AI Technical Summary

Problems solved by technology

Although there is also mesoporous structure Bi 5 o 7 I, but the sheet-like structure it generates has disadvantages such as small specific surface area. Therefore, it is necessary to explore a Bi that is simple to operate, short in reaction time, large in specific surface area, uniform in shape, and can be successfully doped with rare earth ions. 5 o 7 I, and effectively improve the photocatalytic activity, which has important theoretical and practical significance

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