| 薛嘉成,史纪元,鲁世键,杨秋林,霍丹.纤维素基荧光纸传感器的构建及其对Fe3+的现场快速检测[J].中国造纸学报,2026,41(3):179-187 |
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| 纤维素基荧光纸传感器的构建及其对Fe3+的现场快速检测 |
| Cellulose-based Fluorescent Paper Sensor for Rapid on-site Detection of Fe³⁺ |
| 投稿时间:2026-01-23 修订日期:2026-04-08 |
| DOI:10.11981/j.issn.1000-6842.2026.03.179 |
| 中文关键词: 荧光探针 纤维素 铁离子识别 饮用水 |
| Key Words:fluorescent probe cellulose iron ion recognition drinking water |
| 基金项目:中国博士后基金面上项目2023M731166山东省博士后创新项目SDCX—ZG-202303084国家自然科学基金21908167中国博士后基金面上项目(2023M731166);山东省博士后创新项目(SDCX—ZG-202303084);国家自然科学基金(21908167)。 |
| 作者 | 单位 | 邮编 | | 薛嘉成* | 天津科技大学轻工科学与工程学院,生物基纤维材料全国重点实验室,天津,300457 | 300457 | | 史纪元 | 天津科技大学轻工科学与工程学院,生物基纤维材料全国重点实验室,天津,300457 | 300457 | | 鲁世键 | 天津科技大学轻工科学与工程学院,生物基纤维材料全国重点实验室,天津,300457 | 300457 | | 杨秋林 | 天津科技大学轻工科学与工程学院,生物基纤维材料全国重点实验室,天津,300457 | 300457 | | 霍丹* | 天津科技大学轻工科学与工程学院,生物基纤维材料全国重点实验室,天津,300457 | 300457 |
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| 中文摘要: |
| 本研究以胍基乙酸(GAA)与柠檬酸(CA)为原料,通过脱羧-脱水-缩聚反应形成扩展π-共轭结构的荧光共轭物(GCF);GCF利用其表面羧基将纸浆纤维的羟基酯化,以得到的GCF改性纸浆抄造制备荧光纸(GCF-纸),以获得固定化Fe3+荧光探针平台。结果表明,GCF的最优制备条件为GAA与CA物质的量比1∶3、反应温度140 ℃、反应时间60 min,其可在激发波长365 nm下发出青绿色荧光,0.1 mg/L的Fe3+即可使GCF荧光猝灭,而对Na+、K+、Ca2+、Mg2+、Zn2+、Cu2+、Al3+等几乎无响应,其高灵敏度满足GB 5749—2022《生活饮用水卫生标准》中Fe3+含量检测的限值(0.3 mg/L)要求。GCF-纸的最佳制备条件为酯化温度80 ℃、酯化时间60 min,与未改性纸相比,其力学性能差异较小(<5%)。此外,红外光谱表征结果表明,Fe3+导致GCF-纸荧光猝灭归因于“络合-电子转移”机理。 |
| Abstract: |
| In this study, guanidinoacetic acid (GAA) and citric acid (CA) were used as materials to synthesize fluorescent conjugates (GCF) with an extended π-conjugated structure through decarboxylation-dehydration-condensation reaction. The hydroxyl groups of pulp fibers were esterified by carboxyl groups of GCF, and then the obtained GCF modified pulp processed into fluorescent paper (GCF-paper) to prepare an immobilized Fe3+ fluorescent probe platform. The results showed that the optimal preparation conditions for GCF were a molar ratio of GAA to CA of 1∶3, a reaction temperature of 140 ℃, and a reaction time of 60 min. Under these conditions, the prepared GCF emitted cyan-green fluorescence at an excitation wavelength of 365 nm. As little as 0.1 mg/L of Fe3+ could quench GCF fluorecence via the “coordination-electron transfer” mechanism, whereas Na+, K+, Ca2+, Mg2+, Zn2+, Cu2+, and Al3+ exhibited negligible response. Its high sensitivity met the detection requirements for the Fe3+ concentration limit (0.3 mg/L) specified in the Standards for Drinking Water Quality (GB 5749—2022). The optimal preparation conditions for GCF-paper were an esterification temperature of 80 ℃ and an esterification time of 60 min. Compared with the unmodified paper, the difference in mechanical properties of GCF-paper was relatively small (<5%). In addition, FT-IR analysis was performed to investigate the mechanism of Fe3+ causing fluorescence quenching in GCF-paper. |
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