水中氧化石墨烯稳定性的影响因素研究

李璇; 王燕; 方华; 章婷婷; 赵怡

doi:10.13205/j.hjgc.202402014

水中氧化石墨烯稳定性的影响因素研究

doi: 10.13205/j.hjgc.202402014

李璇¹,
王燕²,
方华^2, ,,
章婷婷²,
赵怡²

1. 江苏省环境工程技术有限公司, 南京 210019;
2. 南京信息工程大学环境科学与工程学院, 南京 210044

基金项目:

江苏省生态环境科研项目-成果转化与推广类(2021001)

江苏省自然科学基金-面上项目(BK20221564)

详细信息

作者简介:
李璇(1982-),女,硕士,高级工程师,主要研究方向为水污染治理和水环境管理。liseu@jsep.com

通讯作者:
方华(1976-),男,副教授,主要研究方向为水污染控制技术与原理。fanghua@nuist.edu.cn

计量
- 文章访问数: 100
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- 被引次数: 0
出版历程
- 收稿日期: 2023-06-27
- 网络出版日期: 2024-04-28

INFLUENCING FACTORS OF STABILITY OF GRAPHENE OXIDE IN WATER

1. Jiangsu Environmental Engineering Technology Co., Ltd., Nanjing 210019, China;
2. School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China

摘要

摘要: 基于理化性质分析,研究了电解质、天然有机物和稳定液浓度等因素对氧化石墨烯(Graphene Oxide, GO)在水中凝聚和沉降的影响。结果表明,稳定液浓度对GO理化性质和稳定性影响不大。电解质投加可降低Zeta电位,诱导水中GO发生凝聚,凝聚过程呈现反应限制和扩散限制2个阶段。各电解质的临界凝聚浓度分别为180 mmol/L(Na⁺)、4.5 mmol/L(Mg²⁺)和1.8 mmol/L(Ca²⁺)。相较于Mg²⁺,Ca²⁺可通过吸附架桥作用加快GO凝聚。GO的沉降过程可分为快速沉降和慢速沉降2个阶段,凝聚是影响水中GO沉降的主要因素。天然有机物存在可有效抑制凝聚,增强GO在水中的稳定性;但HA与GO和Ca²⁺间存在复杂的相关作用关系,加快了凝聚过程。水中GO浓度越高,其凝聚和沉降速度越快。以较低浓度存在时,GO在水环境中具有更高的稳定性。
- 氧化石墨烯 /
- 电解质 /
- 天然有机物 /
- 凝聚 /
- 沉降
Abstract: Based on the analysis of the physicochemical properties of graphene oxide(GO), the effects of electrolyte, natural organic matter(NOM), and stable solution concentration on its aggregation and sedimentation in water were studied. The results showed that the concentration of GO stable solution had little effect on its physicochemical properties and stability in water. Electrolytes induced the GO aggregation by reducing Zeta potential in water. The aggregation process presented two stages: reaction limited and diffusion limited. The critical condensation concentrations(CCC) of each electrolyte were 180 mmol/L of Na⁺, 4.5 mmol/L of Mg²⁺ and 1.8 mmol/L of Ca²⁺, respectively. Compared with Mg²⁺, Ca²⁺ could strengthen the aggregation process by adsorption bridging. The sedimentation process of GO was also divided into two stages: rapid sedimentation and slow sedimentation, and aggregation was the main factor affecting GO sedimentation. The presence of natural organic matter could effectively inhibit coagulation and enhance the stability of GO in water. However, HA has a complex correlation with GO and Ca²⁺, which further accelerates the aggregation process. With the increase of GO concentration in water, the aggregation and sedimentation rate were accelerated. In the presence of a lower concentration, GO had higher stability in the water environment.
- graphene oxide /
- electrolytes /
- natural organic matter /
- aggregation /
- sedimentation

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