水质参数对功能化石墨烯在水中凝聚行为的影响

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摘要采用动态光散射技术研究了不同价态阳离子、富里酸（FA）等对两种功能化石墨烯（FG）悬浮凝聚行为的影响机制.结果表明：FG分别在含不同浓度Na⁺、Ca²⁺和La³⁺的电解质溶液中，其临界聚集浓度（CCC）值范围为221~263，3~4，0.05~0.07mmol/L，符合经典的DLVO理论与Schulze-Hardy法则.5种FA亚组分均可显著抑制FG在水体中的凝聚，加入5mg/L的FA亚组分后，在不同浓度的Ca²⁺和La³⁺的电解质溶液中，FG-OH （FG-COOH）的CCC值分别增大12.5%~37.5%（3.2%~4.5%）和4.2%~25.7%（10%~46%）.FG的CCC值与FA亚组分的C、H含量和H/C比显著正相关（P<0.05），与O含量、O/C比和羧基C含量显著负相关（P<0.05）.差分荧光光谱研究表明随着FG的加入，FA的荧光强度逐渐降低，二者发生相互作用.

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	夏鹏
	张为波
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	李忠玉
	白英臣

关键词 ：功能化石墨烯, 富里酸亚组分, 凝聚动力学

Abstract：The influence mechanisms of cations with different valences and fulvic acid (FA) on aggregation behaviours of two functionalized graphene (FG) were investigated by dynamic light scattering technique. The critical coagulation concentration (CCC) values of FG in electrolyte solutions containing Na⁺, Ca²⁺ and La³⁺ ranged from 221~263, 3~4 and 0.05~0.07mmol/L respectively, which were consistent with DLVO theory and Schulze-Hardy rule. The five FA sub-fractions can significantly inhibit the aggregation of FG in water. After adding 5mg/L FA sub-fractions, the CCC values of FG-OH (FG-COOH) increased 12.5%~37.5% (3.2%~4.5%) and 4.2%~25.7% (10%~46%), respectively in electrolyte solutions containing Ca²⁺ and La³⁺. The CCC values of FG were positively significantly correlated with the C content, H content and H/C ratio (P<0.05), and negatively significantly correlated with the O content, O/C ratio and carboxylic C of FA sub-fractions (P<0.05). The fluorescence intensity of FA gradually decreased with the addition of FG indicating the interactions between FG and FA.

Key words： functionalized graphene fulvic acid sub-fractions aggregation kinetics

收稿日期: 2022-04-02

PACS:

X131.2

基金资助:国家自然科学基金资助项目（41773085）；中央公益科研院所基本科研项目（2021YSKY-02）；江苏省研究生科研与实践创新计划项目（SJCX21_1258）

通讯作者: 李忠玉,教授,zhongyuli@cczu.edu.cn;白英臣,研究员,baiyc@craes.org.cn E-mail: zhongyuli@cczu.edu.cn;baiyc@craes.org.cn

作者简介: 夏鹏(1998-),男,江苏镇江人,常州大学硕士研究生,主要从事污染物环境行为及环境基准的研究.发表论文5篇.

引用本文:

夏鹏, 张为波, 巢铸, 郭飞, 李忠玉, 白英臣. 水质参数对功能化石墨烯在水中凝聚行为的影响[J]. 中国环境科学, 2022, 42(10): 4631-4638. XIA Peng, ZHANG Wei-bo, CHAO Zhu, GUO Fei, LI Zhong-yu, BAI Ying-chen. Influence of water quality parameters on the aggregation behaviors of functionalized graphene in aquatic system. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4631-4638.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I10/4631

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