Nanofiber spherical silicon-based heterogeneous Fenton catalyst as well as synthetic method and application thereof

Abstract

The invention discloses a nanofiber spherical silicon-based heterogeneous Fenton catalyst as well as a synthetic method and application thereof. The synthetic method is characterized by comprising thefollowing steps: adding TEOS (Tetraethyl Orthosilicate) into a mixed solution composed of n-amyl alcohol and cyclohexane to form a solution A; dissolving urea and CPBH into deionized water to form asolution B; mixing the solution A and the solution B, dropwise dripping a Cu(NO3)2 / 3H2O solution, stirring in a water bath to form a solution C, and carrying out a hydrothermal reaction in a drying oven at the temperature of 120-140 DEG C for 5-7 hours; filtering the obtained solid product, alternatively washing with deionized water and acetone, and drying; and calcining in a muffle furnace, and cooling, thereby obtaining the heterogeneous Fenton catalyst in the invention. According to the nanofiber spherical silicon-based heterogeneous Fenton catalyst disclosed by the invention, a harsh condition that the pH value of the system is regulated to 2-3 is not needed in the reaction process, and the catalyst has an excellent removal effect on degradation of non-biodegradable organic pollutantsunder neutral room temperature conditions.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a nanofibrous spherical silicon-based heterogeneous Fenton catalyst and its synthesis method and application. Background technique [0002] In recent years, a large number of refractory organic pollutants (such as pesticides, medicines and endocrine disruptors, etc.) have been continuously released into water bodies, which has seriously threatened the ecological environment and human life and health. However, traditional physical, chemical and biological water treatment technologies are often unable to effectively remove these persistent persistent pollutants. [0003] The Fenton reaction is a typical advanced oxidation process, and it has become a potential technology of choice for the removal of such pollutants due to the generation of a large number of strong oxidizing hydroxyl radicals (·OH) in the reaction. However, the classic homogeneous Fenton reaction cannot b...

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Problems solved by technology

However, heterogeneous Fenton catalysts still have low activity, poor stability and hydrogen peroxide (H 2 o 2 ) problems such as low utilization rate

One of the main reasons for its low activity is that the active components of the catalyst are not fully in contact with hydrogen peroxide and pollutants; one of the main reasons for the poor stability is that the active components in the supported catalyst are not bonded to the carrier, resulting in the active components Parts are separated and released into solution during the reaction

[0005] A common solution is to in-situ dope the active components into the carrier to make them bonded. However, although this method improves the stability of the catalyst, it often makes the active components wrapped in the internal structure of the catalyst, which cannot Contact with free molecules in solution, resulting in reduced activity

Therefore, for heterogeneous Fenton catalysts, activity and stability are often two contradictory points that cannot be satisfied at the same time

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