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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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

Received: 02 April 2022

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X131.2

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	Articles by authors
	XIA Peng
	ZHANG Wei-bo
	CHAO Zhu
	GUO Fei
	LI Zhong-yu
	BAI Ying-chen

Cite this article:

XIA Peng,ZHANG Wei-bo,CHAO Zhu等. Influence of water quality parameters on the aggregation behaviors of functionalized graphene in aquatic system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4631-4638.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4631

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