以水稻秸秆为原料的 ZnCl2 活性介孔碳:合成工艺的优化及其作为阿莫西林高效吸附剂的应用。

IF 3.1 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Suwiwat Sangon, Kanokwan Kotebantao, Theerakan Suyala, Yuvarat Ngernyen, Andrew J. Hunt and Nontipa Supanchaiyamat
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引用次数: 0

摘要

通过对水稻秸秆进行优化和高效的氯化锌(ZnCl2)化学活化,得到了具有卓越吸附抗生素阿莫西林(AMX)能力的高介孔碳。研究发现,AMX 的最大吸附容量高达 1,308 mg g-1。通过 TGA-IR 对热解过程有了更深入的了解,证明氯化锌活化可降低碳化温度,抑制焦油的形成,并在热解脱水过程中导致含氧化合物的大量释放。此外,还提出了氯化锌活化水稻秸秆碳化的两个步骤,包括生物质(纤维素、半纤维素和木质素)在低温下分解和随后在高温下脱水,以获得更多的石墨介孔碳。稻草与氯化锌的最佳比例为 1:2(ZAC1:2),X 射线衍射和 X 射线光电子能谱分析证实了石墨碳的存在,并揭示了碳结构中氧化锌的存在。此外,ZAC1:2 的表面积高达 941 m2 g-1,孔隙率大,中孔率为 100%,孔径分布窄,仅为 2-6 nm,这些都大大增强了 AMX 的吸附能力。朗缪尔吸附等温线模型显示了均匀吸附,而动力学研究则显示了伪二阶动力学模型的拟合。这些都凸显了介孔氯化锌 2-活化稻草碳在废水处理和抗生素等新兴污染物修复方面的巨大应用潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

ZnCl2 activated mesoporous carbon from rice straw: optimization of its synthetic process and its application as a highly efficient adsorbent for amoxicillin†

ZnCl2 activated mesoporous carbon from rice straw: optimization of its synthetic process and its application as a highly efficient adsorbent for amoxicillin†

Optimized and efficient zinc chloride (ZnCl2)-based chemical activation of rice straw yielded highly mesoporous carbons with an exceptional ability to adsorb the antibiotic amoxicillin (AMX). The maximum AMX adsorption capacity was found to be as high as 1308 mg g−1. Greater understanding of the pyrolysis process was gained through TGA-IR, demonstrating that ZnCl2 activation could reduce carbonization temperature, inhibit tar formation, and lead to the extensive release of oxygen-containing compounds during the dehydration processes in pyrolysis. In addition, a 2-step strategy for rice straw carbonization activated by ZnCl2 is proposed, involving biomass (cellulose, hemicellulose, and lignin) decomposition at low temperature and subsequent dehydration at a higher temperature to obtain more graphitic mesoporous carbon. The optimum ratio of rice straw to ZnCl2 was 1 : 2 (ZAC1:2); X-ray diffraction and X-ray photoelectron spectroscopic analysis confirmed the occurrence of graphitic carbon and revealed the existence of ZnO within the carbon structure. This, in combination with a significant surface area of 941 m2 g−1, large pore volume, and 100% mesoporosity with a narrow pore size distribution of 2–6 nm, significantly enhanced AMX adsorption. The Langmuir adsorption isotherm model revealed homogeneous adsorption, while kinetic studies revealed a fit to the pseudo-second order kinetic model. These highlight the significant potential of mesoporous ZnCl2-activated rice straw carbon for application in wastewater treatment and in the remediation of emerging pollutants such as antibiotics.

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来源期刊
Environmental Science: Water Research & Technology
Environmental Science: Water Research & Technology ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES
CiteScore
8.60
自引率
4.00%
发文量
206
期刊介绍: Environmental Science: Water Research & Technology seeks to showcase high quality research about fundamental science, innovative technologies, and management practices that promote sustainable water.
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