Radiation induced degradation of Congo red dye: a mechanistic study

IF 0.7 4区物理与天体物理 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Nukleonika Pub Date : 2019-06-01 DOI:10.2478/nuka-2019-0006

M. Muneer, M. Saeed, I. Bhatti, A. Haq, M. K. Khosa, M. Jamal, Saddaqat Ali

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引用次数: 13

Abstract

Abstract Synthetic dyes are persistent pollutants with poor biodegradability. The present study is about the degradation of direct Congo red dye in aqueous media using the Co-60 gamma radiation source. The experimental conditions such as gamma-ray absorbed doses, amount of oxidant (H2O2) and pH conditions were evaluated. The λmax of dye solution was noted as 498 nm, and then, decrease in absorbance and reduction in chemical oxygen demand (COD) were examined. The complete colour removal of dye was observed at 5 kGy, while a significant COD removal was observed at 15 kGy gamma-ray absorbed dose in conjunction with oxidant for 50 mg/L concentration. It was found that pH has no influence on degradation efficiency. A possible degradation pathway was proposed. The radiolytic end products were monitored by Fourier transform infrared (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) to explore the degradation mechanism. It was imperative to study the oxidative degradation pathway to provide directions for potential applicability of advanced oxidation process (AOP) in industrial wastewater treatment.

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辐射诱导刚果红染料降解的机理研究

合成染料是一种持久性污染物，生物降解性差。本文研究了Co-60 γ辐射源对水介质中直接刚果红染料的降解作用。对γ射线吸收剂量、氧化剂(H2O2)用量、pH值等实验条件进行了评价。测定了染料溶液的λmax为498nm，测定了吸光度和化学需氧量(COD)的下降情况。在5 kGy的伽马射线吸收剂量下，染料完全脱色，而在50 mg/L浓度的氧化剂和15 kGy的伽马射线吸收剂量下，COD有明显的脱色效果。发现pH对降解效率没有影响。提出一种可能的降解途径。采用傅里叶变换红外(FTIR)和气相色谱-质谱联用(GC-MS)对辐射降解终产物进行监测，探讨降解机理。深入研究氧化降解途径，为深度氧化工艺在工业废水处理中的潜在适用性提供指导。

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

Nukleonika 物理-无机化学与核化学

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： "Nukleonika" is an international peer-reviewed, scientific journal publishing original top quality papers on fundamental, experimental, applied and theoretical aspects of nuclear sciences. The fields of research include: radiochemistry, radiation measurements, application of radionuclides in various branches of science and technology, chemistry of f-block elements, radiation chemistry, radiation physics, activation analysis, nuclear medicine, radiobiology, radiation safety, nuclear industrial electronics, environmental protection, radioactive wastes, nuclear technologies in material and process engineering, radioisotope diagnostic methods of engineering objects, nuclear physics, nuclear reactors and nuclear power, reactor physics, nuclear safety, fuel cycle, reactor calculations, nuclear chemical engineering, nuclear fusion, plasma physics etc.