Reductive degradation of carbon tetrachloride using tree leaf polyphenol–iron complexes for groundwater remediation†

IF 4.6 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
RSC Advances Pub Date : 2025-07-04 DOI:10.1039/D5RA01391G
Roselle Colastre Lasagas, Chenju Liang, Xuyen Thi Hong Luong and Florencio Ballesteros
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引用次数: 0

Abstract

Plant polyphenols, natural antioxidants, form complexes with iron minerals that enhance contaminant degradation via reductive processes. This study investigated the degradation of carbon tetrachloride (CT) using polyphenol–iron complexes synthesized from tree leaf extracts. Polyphenols were extracted from waste tree leaves, including Ficus microcarpa, Terminalia neotaliala, Haematoxylon campechianum, Ficus septica, Mangifera indica, and Ficus religiosa, with gallic acid identified as the predominant constituent. Among them, Terminalia neotaliala exhibited superior antioxidant capacity, reducing power, metal-chelating ability, and total phenolic content, making it the optimal choice for CT degradation experiments. Using the Taguchi method, optimal conditions for CT degradation were determined as pH 10, a leaf extract dose of 10 g L−1, and an Fe2+ concentration of 15 mM, with pH as the most influential factor. Under these conditions, CT degradation reached 99% in aqueous solution and 89% in field groundwater within 24 h. Detected intermediates included trichloromethane, dichloromethane, and chloromethane, with chloride ions as the final mineralization product. This study underscores the potential of tree leaf polyphenols, in combination with Fe2+, as a sustainable approach for groundwater remediation.

Abstract Image

利用树叶多酚-铁络合物还原降解地下水中的四氯化碳[j]
植物多酚,天然抗氧化剂,与铁矿物形成复合物,通过还原过程增强污染物降解。研究了以树叶提取物为原料合成的多酚-铁配合物对四氯化碳的降解作用。从废树叶中提取了多酚类物质,主要包括小叶榕、新根榕、红杉、无花果、芒果和榕,其中没食子酸为主要成分。其中,新alialia neotaliala具有较强的抗氧化能力、还原能力、金属螯合能力和总酚含量,是CT降解实验的最佳选择。采用田口法,以pH为影响因素,确定了CT降解的最佳条件为pH 10,叶提取物剂量为10 g L−1,Fe2+浓度为15 mM。在此条件下,24 h内CT在水溶液中的降解率达到99%,在野外地下水中的降解率达到89%。检测到的中间体包括三氯甲烷、二氯甲烷和氯甲烷,最终矿化产物为氯离子。该研究强调了树叶多酚与Fe2+结合作为地下水可持续修复方法的潜力。
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来源期刊
RSC Advances
RSC Advances chemical sciences-
CiteScore
7.50
自引率
2.60%
发文量
3116
审稿时长
1.6 months
期刊介绍: An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.
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