Columnar cobalt molybdate spinel rooted on three-dimensional nickel foam as robust catalyst for 4-nitrophenol degradation through peroxymonosulfate activation

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Research Pub Date : 2025-02-01 DOI:10.1016/j.envres.2024.120579
Jieling Huang , Qiulin Li , Yuyue Zhu , Jie Wu , Guangyin Fan
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Abstract

Metal oxides-catalyzed peroxymonosulfate (PMS) activation systems show promise in decomposing organic pollutants, whereas the critical challenges such as catalyst aggregation and metal ion leaching significantly impact the stability and reusability of catalysts and thus limit widespread application. To address these issues, an effective self-supported three-dimensional PMS activator consisted of spinel cobalt molybdate (CoMoO4) and nickel foam (NF) (CoMoO4/NF) is fabricated through hydrothermal and annealing processes. The cooperative redox interaction between Co and Mo metal sites in CoMoO4/NF play a crucial role in efficiently activating PMS to degrade 4-nitrophenol (4-NP). Specifically, the CoMoO4/NF/PMS system achieves a 95% degradation rate for 4-NP within 35 min. Attributing to the unique columnar structure and strong connection between CoMoO4 and NF, the catalyst/PMS system maintains high efficiency after five cycles. Furthermore, the system demonstrates broad applicability for degrading various organic pollutants and resistance to interference from different pH levels, inorganic anions, and humic acid. This study proposes radical/non-radical degradation pathways by identifying active species and investigates the degradation mechanism and toxicity of intermediate products for 4-NP. These findings offer valuable insights for designing and synthesizing self-supported catalysts to eliminate pollutants through PMS activation.
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柱状钼酸钴尖晶石扎根于三维泡沫镍上,通过过氧单硫酸盐活化降解4-硝基苯酚。
金属氧化物催化的过氧单硫酸盐(PMS)活化系统在分解有机污染物方面表现出良好的前景,然而催化剂聚集和金属离子浸出等关键挑战严重影响了催化剂的稳定性和可重复使用性,从而限制了其广泛应用。为了解决这些问题,通过水热和退火工艺制备了一种有效的由尖晶石钼酸钴(CoMoO4)和泡沫镍(NF)组成的自支撑三维PMS活化剂。CoMoO4/NF中Co和Mo金属位点的协同氧化还原相互作用对有效激活PMS降解4-硝基苯酚(4-NP)起着至关重要的作用。具体来说,CoMoO4/NF/PMS系统在35分钟内实现了95%的4-NP降解率。由于独特的柱状结构和CoMoO4与NF之间的强连接,催化剂/PMS体系在5次循环后仍保持高效率。此外,该系统具有广泛的适用性,可降解各种有机污染物,并能抵抗不同pH值、无机阴离子和腐植酸的干扰。本研究通过鉴定活性物种提出了4-NP的自由基/非自由基降解途径,并研究了4-NP中间产物的降解机制和毒性。这些发现为设计和合成通过PMS活化去除污染物的自支撑催化剂提供了有价值的见解。
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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