Performance of zero-valent iron immobilized on activated carbon cloth for the removal of phenol from wastewater

IF 6 3区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Sciences Europe Pub Date : 2024-07-15 DOI:10.1186/s12302-024-00954-1
Muhammad Yusuf Suleiman, Opeoluwa Olusola Fasanya, Abdulazeez Yusuf Atta, Fei Ye, Joydeep Dutta, Baba El-Yakubu Jibril
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Abstract

Background

Discharge of large amounts of untreated industrial effluent into water bodies pose significant environmental challenges worldwide. This is due to the limitations of traditional wastewater treatment methods in the treatment of recalcitrant organic pollutants. Fenton processes involves the generation of hydroxyl radicals that are well suited to degrade organics in effluent water. This study focuses on reducing slag generation during Fenton processes and enhancing the reuse of nano-zero-valent iron (NZVI) through the immobilization of NZVI on activated carbon cloth (ACC) through a chitosan (CH) linker with phenol as a model pollutant.

Results

Microstructural and spectroscopic techniques were employed to study the materials prepared and 37.5 wt% iron loading was achieved. Phenol degradation of 96.3% at 40 °C at pH of 3.0 with 50 mM H2O2 was achieved using ACC-CH-NZVI. Adsorption and degradation studies carried out using ACC-CH-NZVI catalyst revealed that phenol adsorption onto ACC-CH-NZVI fits the Langmuir isotherm model, following the pseudo-second-order kinetic model and first-order reaction kinetics. Thermodynamic studies indicate the non-spontaneous, endothermic and irreversible nature of the removal process. Comparing ACC-CH-NZVI with ACC and ACC-CH, phenol removal using ACC drops from 87.8 to 39%, while using ACC-CH, the removal efficiency drops from 73 to 20.9% and using ACC-CH-NZVI, phenol removal drops from 96.3 to about 70% and total organic carbon removal drops from 79 to about 60% with minimal iron leaching, highlighting the superior performance of ACC-CH-ZVI and the role of NZVI in enhancing phenol removal.

Conclusions

The catalyst demonstrated good stability for phenol degradation to about 70% phenol removal from simulated wastewater and 60% TOC removal from industrial wastewater after five treatment cycles with minimal Fe leaching.

Graphical abstract

Abstract Image

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固定在活性炭布上的零价铁去除废水中苯酚的性能
背景大量未经处理的工业废水被排放到水体中,给全世界带来了巨大的环境挑战。这是由于传统废水处理方法在处理难降解有机污染物方面存在局限性。芬顿工艺涉及羟基自由基的生成,非常适合降解废水中的有机物。本研究以苯酚为模型污染物,通过壳聚糖(CH)链接物将纳米零价铁(NZVI)固定在活性碳布(ACC)上,从而减少 Fenton 过程中产生的熔渣,并提高纳米零价铁(NZVI)的再利用率。使用 ACC-CH-NZVI 在 40 °C、pH 值为 3.0、50 mM H2O2 的条件下实现了 96.3% 的苯酚降解。使用 ACC-CH-NZVI 催化剂进行的吸附和降解研究表明,苯酚在 ACC-CH-NZVI 上的吸附符合 Langmuir 等温线模型,并遵循伪二阶动力学模型和一阶反应动力学。热力学研究表明,去除过程具有非自发、内热和不可逆的性质。将 ACC-CH-NZVI 与 ACC 和 ACC-CH 相比较,使用 ACC 的苯酚去除率从 87.8% 降至 39%,而使用 ACC-CH 的去除率从 73% 降至 20.9%,使用 ACC-CH-NZVI 的苯酚去除率从 96.3% 降至约 70%,总有机碳去除率从 79% 降至约 60%,铁浸出极少,这凸显了 ACC-CH-ZVI 的优越性能以及 NZVI 在提高苯酚去除率方面的作用。结论该催化剂具有良好的苯酚降解稳定性,经过五个处理周期后,模拟废水中的苯酚去除率约为 70%,工业废水中的总有机碳去除率约为 60%,铁浸出极少。
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来源期刊
Environmental Sciences Europe
Environmental Sciences Europe Environmental Science-Pollution
CiteScore
11.20
自引率
1.70%
发文量
110
审稿时长
13 weeks
期刊介绍: ESEU is an international journal, focusing primarily on Europe, with a broad scope covering all aspects of environmental sciences, including the main topic regulation. ESEU will discuss the entanglement between environmental sciences and regulation because, in recent years, there have been misunderstandings and even disagreement between stakeholders in these two areas. ESEU will help to improve the comprehension of issues between environmental sciences and regulation. ESEU will be an outlet from the German-speaking (DACH) countries to Europe and an inlet from Europe to the DACH countries regarding environmental sciences and regulation. Moreover, ESEU will facilitate the exchange of ideas and interaction between Europe and the DACH countries regarding environmental regulatory issues. Although Europe is at the center of ESEU, the journal will not exclude the rest of the world, because regulatory issues pertaining to environmental sciences can be fully seen only from a global perspective.
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