Influence of water quality parameters on the aggregation behaviors of functionalized graphene in aquatic system
XIA Peng1,2, ZHANG Wei-bo3, CHAO Zhu2, GUO Fei2, LI Zhong-yu1, BAI Ying-chen1,2
1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China; 2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. School of Resources & Environment, Nanchang University, Nanchang 330031, China
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.
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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