TOXICITY EFFECT OF ORGANIC MODIFIED LAYERED DOUBLE HYDROXIDE COMBINED WITH METHYL ORANGE ON <i>CHLORELLA VULGARIS</i>

PAN Xuemei; QIU Fangfang; WANG Qinyuan; CHEN Jincheng; ZHANG Ping

doi:10.13205/j.hjgc.202301004

Volume 41 Issue 1

Jan. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(1): 26-34

PAN Xuemei, QIU Fangfang, WANG Qinyuan, CHEN Jincheng, ZHANG Ping. TOXICITY EFFECT OF ORGANIC MODIFIED LAYERED DOUBLE HYDROXIDE COMBINED WITH METHYL ORANGE ON CHLORELLA VULGARIS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 26-34. doi: 10.13205/j.hjgc.202301004

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PAN Xuemei, QIU Fangfang, WANG Qinyuan, CHEN Jincheng, ZHANG Ping. TOXICITY EFFECT OF ORGANIC MODIFIED LAYERED DOUBLE HYDROXIDE COMBINED WITH METHYL ORANGE ON CHLORELLA VULGARIS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(1): 26-34. doi: 10.13205/j.hjgc.202301004

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TOXICITY EFFECT OF ORGANIC MODIFIED LAYERED DOUBLE HYDROXIDE COMBINED WITH METHYL ORANGE ON CHLORELLA VULGARIS

doi: 10.13205/j.hjgc.202301004

1. Jiangxi Academy of Water Science and Engineering, Nanchang 330029, China;
2. Jiangxi Provincial Key Laboratory of Water Resources and Ecological Environment of Poyang Lake, Nanchang 330029, China;
3. Jiangxi Provincial Ecological Water Conservancy Technological Innovation Center of Poyang Lake, Nanchang 330029, China;
4. Key Laboratory of Environment and Resource Utilization of Poyang Lake, Ministry of Education, School of Resource Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China;
5. Jiangxi Yinli Direct Drinking Water Equipment Corporation, Xinyu 338000, China

Received Date: 2022-05-18
Available Online: 2023-03-23

Abstract

Abstract

In order to explore the toxicity effect of organic modified layered double hydroxide (O-LDH) combined with methyl orange (MO) on microalgae, Chlorella vulgaris was selected as the experimental algae species in this study. The effects of single and combined exposure of O-LDH and MO on growth inhibition, chlorophyll content and cell structure of C. vulgaris were investigated. The adsorption and toxicity mechanism of O-LDH and MO on C. vulgaris were investigated by measuring residual MO concentration and cell surface potential of algae. The results were as follows:1) the fitting results of 96 h growth inhibition rate of algae by O-LDH and MO were in accordance with the Logistic model (R²>0.99), the EC_50-96h values were 122.18, 26.73 mg/L, respectively, and the inhibition effect of MO on C. vulgaris was greater than that of O-LDH. 2) the toxicity mechanisms of O-LDH to C. vulgaris included the shading effect caused by the aggregation of nanolamellae on the surface of microalgae cells and the oxidative damage caused by the fragmentation of cell structure by nanolamellae. 3) at low concentrations of O-LDH (0~50 mg/L), O-LDH in the solution was strongly adsorbed by microalgal cells, resulting in enhanced combined toxicity of O-LDH and MO to C. vulgaris. At high concentrations of O-LDH (50~500 mg/L), O-LDH and the products of MO adsorbed by O-LDH in the solution competed for charge sites on the surface of microalgal cells, and the hydrophobic layer was formed on the surface of O-LDH after adsorbing MO, which weakened the shadow effect of O-LDH on microalgae cells and reduced oxidative damage, leading to weakened combined toxicity of O-LDH and MO to C. vulgaris.
- organic modified layered double hydroxide(O-LDH),
- methyl orange,
- C. vulgaris,
- combined exposure,
- adsorption,
- toxicity effect

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References(30)

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