Ahmed Harez R, Hama Aziz Kosar Hikmat, Agha Nian N M, Mustafa Fryad S, Hinder Steven John
Department of Chemistry, College of Science, University of Sulaimani Qlyasan Street Sulaimani City 46001 Kurdistan Region Iraq
College of Science, Department of Medical Laboratory Science, Komar University of Science and Technology Sulaimani 46001 Iraq.
RSC Adv. 2023 Sep 4;13(37):26252-26266. doi: 10.1039/d3ra04566h. eCollection 2023 Aug 29.
The excessive use of organic pollutants like organic dyes, which enter the water environment, has led to a significant environmental problem. Finding an efficient method to degrade these pollutants is urgent due to their detrimental effects on aquatic organisms and human health. Carbon-based catalysts are emerging as highly promising and efficient alternatives to metal catalysts in Fenton-like systems. They serve as persulfate activators, effectively eliminating recalcitrant organic pollutants from wastewater. In this study, iron-loaded carbon black (Fe-CB) was synthesized from tire waste using chemical vapor deposition (CVD). Fe-CB exhibited high efficiency as an activator of peroxydisulfate (PDS), facilitating the effective degradation and mineralization of rhodamine B (RhB) in water. A batch experiment and series characterization were conducted to study the morphology, composition, stability, and catalytic activity of Fe-CB in a Fenton-like system. The results showed that, at circumneutral pH, the degradation and mineralization efficiency of 20 mg L RhB reached 92% and 48% respectively within 60 minutes. Fe-CB exhibited excellent reusability and low metal leaching over five cycles while maintaining almost the same efficiency. The degradation kinetics of RhB was found to follow a pseudo-first-order model. Scavenging tests revealed that the dominant role was played by sulfate (SO˙) and superoxide (O˙) radicals, whereas hydroxyl radicals (OH˙) and singlet oxygen (O) played a minor role in the degradation process. This study elucidates the detailed mechanism of PDS activation by Fe-CB, resulting in the generation of reactive oxygen species. It highlights the effectiveness of Fe-CB/PDS in a Fenton-like system for the treatment of water polluted with organic dye contaminants. The research provides valuable insights into the potential application of carbon black derived from tire waste for environmental remediation.
有机染料等有机污染物过度进入水环境已引发严重的环境问题。鉴于这些污染物对水生生物和人类健康的有害影响，迫切需要找到一种高效的方法来降解它们。在类芬顿体系中，碳基催化剂正成为极具潜力且高效的金属催化剂替代品。它们作为过硫酸盐活化剂，能有效去除废水中难降解的有机污染物。本研究采用化学气相沉积（CVD）法从轮胎废料中合成了负载铁的炭黑（Fe-CB）。Fe-CB作为过二硫酸盐（PDS）的活化剂表现出高效性，能促进水中罗丹明B（RhB）的有效降解和矿化。进行了批次实验和系列表征，以研究Fe-CB在类芬顿体系中的形态、组成、稳定性和催化活性。结果表明，在接近中性的pH值下，20 mg/L RhB在60分钟内的降解和矿化效率分别达到92%和48%。Fe-CB在五个循环中表现出优异的可重复使用性和低金属浸出率，同时保持几乎相同的效率。发现RhB的降解动力学符合准一级模型。清除试验表明，硫酸根自由基（SO˙）和超氧自由基（O˙）起主导作用，而羟基自由基（OH˙）和单线态氧（O）在降解过程中起次要作用。本研究阐明了Fe-CB活化PDS产生活性氧物种的详细机制。它突出了Fe-CB/PDS在类芬顿体系中处理受有机染料污染物污染的水的有效性。该研究为轮胎废料衍生的炭黑在环境修复中的潜在应用提供了有价值的见解。
