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首页> 外文期刊>Separation and Purification Technology >Optimisation of an annular photoreactor process for degradation of Congo Red using a newly synthesized titania impregnated kaolinite nano-photocatalyst
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Optimisation of an annular photoreactor process for degradation of Congo Red using a newly synthesized titania impregnated kaolinite nano-photocatalyst

机译：新型二氧化钛浸渍高岭土纳米光催化剂对刚果红降解的环形光反应器工艺的优化

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摘要

In this study, an annular photocatalytic reactor (APR) system was designed and operated to optimise the photocatalytic degradation of Congo Red (CR) using a newly synthesized titania impregnated kaolinite photocatalyst (TiO2/K). The design parameters of the APR: reactor configuration, mass transfer, mixing and hydrodynamics were discussed. The influences of the operation parameters: pH, critical TiO2/K loading, aeration rate and initial CR concentration on the photocatalytic performances were studied in a batch operation mode. Results showed that the initial pH was the most crucial operation parameter that significantly affected both the adsorption and photocatalytic reactions in the APR-TiO2/K system. The point of zero charge for TiO2/K was found to shift towards pH 9.5. The complete degradation of 40 ppm CR was attained in 4h. Possible intermediates and by-products during the CR degradation were identified using the LC/MS technique. The TiO2/K reactivation study showed that the TiO2/K particles are highly stable and have a modest improvement in photoactivity for every recycle trial up to at least five cycles. The overall results revealed that the APR-TiO2/K system has promising application for the development of a technically feasible and cost-effective industrial water and wastewater treatment process.
机译：在这项研究中，设计并运行了环形光催化反应器（APR）系统，以使用新合成的二氧化钛浸渍的高岭石光催化剂（TiO2 / K）优化刚果红（CR）的光催化降解。讨论了APR的设计参数：反应器配置，传质，混合和流体动力学。以分批操作模式研究了pH，TiO2 / K临界负载量，曝气速率和初始CR浓度等操作参数对光催化性能的影响。结果表明，初始pH是最重要的操作参数，它显着影响APR-TiO2 / K系统中的吸附和光催化反应。发现TiO2 / K的零电荷点移向pH 9.5。在4小时内达到40 ppm CR的完全降解。使用LC / MS技术鉴定了CR降解过程中可能的中间体和副产物。 TiO2 / K活化研究表明，TiO2 / K颗粒具有很高的稳定性，并且每次循环试验（至少五个循环）都具有适度的光活性提高。总体结果表明，APR-TiO2 / K系统在开发技术上可行且具有成本效益的工业用水和废水处理工艺方面具有广阔的应用前景。

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