Advanced photocatalysis with biochar-TiO₂ composite for efficient oxidation of Congo red dye.

IF 3 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Monitoring and Assessment Pub Date : 2025-07-01 DOI:10.1007/s10661-025-14290-1

Raveena Malkari Katika, Sumalatha Boddu

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Abstract

In this study, an innovative strategy to synthesize a sustainable composite photocatalyst by integrating rice husk biochar (RHB), derived through the thermal conversion of agricultural biomass, with titanium dioxide (TiO₂) for the enhanced photodegradation of Congo red (CR) dye has been demonstrated. The RHB-TiO₂ composite was systematically characterized using X-ray diffraction (XRD), scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, and UV-visible diffuse reflectance spectroscopy (UV-DRS) to confirm its structural, morphological, and optical properties. Photocatalytic degradation studies under UV irradiation revealed a marked enhancement in CR dye removal efficiency compared to pristine TiO₂. Optimization of process parameters-catalyst dosage, initial dye concentration, and pH-demonstrated maximum degradation at neutral pH within 60 min. Kinetic modeling confirmed pseudo-first-order reaction behavior with a correlation coefficient (R²) of 0.99. The superior performance of the RHB-TiO₂ composite is attributed to its increased surface area, improved adsorption, and enhanced charge separation. This work underscores the potential of RHB-TiO₂ as a cost-effective and eco-friendly photocatalyst for degrading hazardous dyes in wastewater, contributing to environmental and public health protection.

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生物炭- tio2复合材料的先进光催化高效氧化刚果红染料。

本研究展示了一种创新策略，即通过整合农业生物质热转化得到的稻壳生物炭（RHB）和二氧化钛（TiO2）来合成可持续的复合光催化剂，以增强刚果红（CR）染料的光降解。采用x射线衍射（XRD）、扫描电镜结合能量色散x射线能谱（SEM-EDS）、x射线光电子能谱（XPS）、傅里叶变换红外（FTIR）光谱、布鲁诺尔-埃米特-泰勒（BET）表面积分析和uv -可见漫反射光谱（UV-DRS）对RHB-TiO2复合材料进行了系统表征，以确定其结构、形态和光学性质。紫外光催化降解研究表明，与原始TiO2相比，CR染料去除效率显著提高。优化工艺参数（催化剂用量、初始染料浓度和pH）表明，在中性pH下，60 min内降解效果最大。动力学模型证实了伪一级反应行为，相关系数（R2）为0.99。RHB-TiO2复合材料的优异性能归因于其增加的表面积，改善的吸附和增强的电荷分离。这项工作强调了RHB-TiO2作为一种具有成本效益和生态友好型的光催化剂降解废水中的有害染料的潜力，有助于保护环境和公众健康。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Monitoring and Assessment 环境科学-环境科学

CiteScore

4.70

自引率

6.70%

发文量

1000

审稿时长

7.3 months

期刊介绍： Environmental Monitoring and Assessment emphasizes technical developments and data arising from environmental monitoring and assessment, the use of scientific principles in the design of monitoring systems at the local, regional and global scales, and the use of monitoring data in assessing the consequences of natural resource management actions and pollution risks to man and the environment.