Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids
Vermicompost is a promising amendment for immobilization of cadmium (Cd) in soils; however, its effectiveness can be influenced by rhizosphere environment conditions, such as pH and the presence of low-molecular-weight organic acids (LMWOAs). In this study, a batch experiment was conducted to examin...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651323010977 |
| _version_ | 1797643614508023808 |
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| author | Pan Pan Huizhan Liu Ang Liu Xinchun Zhang Qingmian Chen Guihua Wang Beibei Liu Qinfen Li Mei Lei |
| author_facet | Pan Pan Huizhan Liu Ang Liu Xinchun Zhang Qingmian Chen Guihua Wang Beibei Liu Qinfen Li Mei Lei |
| author_sort | Pan Pan |
| collection | DOAJ |
| description | Vermicompost is a promising amendment for immobilization of cadmium (Cd) in soils; however, its effectiveness can be influenced by rhizosphere environment conditions, such as pH and the presence of low-molecular-weight organic acids (LMWOAs). In this study, a batch experiment was conducted to examine the characteristics of Cd adsorption by vermicompost at different pH (pH = 3, 5, and 7) and after the addition of different LMWOAs (oxalic acid; citric acid; malic acid). Furthermore, a series of morphology and structural analyses were conducted to elucidate the mechanisms of observed effects. The results showed that the adsorption capacity of vermicompost for Cd increased as pH increased, and chemisorption dominated the adsorption process. Changes in pH altered adsorption performance by affecting the -OH groups of alcohol/phenol and the -CH2 groups of aliphatics. Further, the addition of oxalic acid promoted Cd adsorption, and the effect was concentration dependent. Modifying the verimicompost surface with more adsorption sites might be the main reason. Conversely, citric acid and malic acid showed the ability to inhibit Cd adsorption by vermicompost. Citric acid caused a blocking effect by covering flocculent substances on the vermicompost surface while reducing surface adsorption sites by dissolving mineral components such as iron oxides. However, the action of malic acid did not appear to be related to changes in morphology or the structure of vermicompost. Overall, the results of this study partially explain the limited effectiveness of Cd immobilization within the rhizosphere by vermicompost, and provide theoretical support for regulating rhizosphere environments to improve the effectiveness of vermicompost immobilization of Cd. |
| first_indexed | 2024-03-11T14:17:27Z |
| format | Article |
| id | doaj.art-9b7142c6db994f5bb4d7b39833cf555a |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-03-11T14:17:27Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-9b7142c6db994f5bb4d7b39833cf555a2023-11-01T04:46:02ZengElsevierEcotoxicology and Environmental Safety0147-65132023-11-01266115593Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acidsPan Pan0Huizhan Liu1Ang Liu2Xinchun Zhang3Qingmian Chen4Guihua Wang5Beibei Liu6Qinfen Li7Mei Lei8Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, China; National Agricultural Environmental Science Observation and Experiment Station, Danzhou 571737, China; Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Haikou 571101, ChinaSchool of Ecology and Environment, Zhengzhou University, Zhengzhou, Henan 450001, ChinaInstitute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, ChinaInstitute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, ChinaInstitute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, ChinaCollege of Forestry, Hainan University, Haikou, Hainan 570228, China; Corresponding author.Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, China; National Agricultural Environmental Science Observation and Experiment Station, Danzhou 571737, China; Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Haikou 571101, China; Corresponding author at: Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, China.Institute of Environmental and Plant Protection, Chinese Academy of Tropical Agricultural Science, Haikou, Hainan 571101, China; National Agricultural Environmental Science Observation and Experiment Station, Danzhou 571737, China; Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Haikou 571101, ChinaInstitute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaVermicompost is a promising amendment for immobilization of cadmium (Cd) in soils; however, its effectiveness can be influenced by rhizosphere environment conditions, such as pH and the presence of low-molecular-weight organic acids (LMWOAs). In this study, a batch experiment was conducted to examine the characteristics of Cd adsorption by vermicompost at different pH (pH = 3, 5, and 7) and after the addition of different LMWOAs (oxalic acid; citric acid; malic acid). Furthermore, a series of morphology and structural analyses were conducted to elucidate the mechanisms of observed effects. The results showed that the adsorption capacity of vermicompost for Cd increased as pH increased, and chemisorption dominated the adsorption process. Changes in pH altered adsorption performance by affecting the -OH groups of alcohol/phenol and the -CH2 groups of aliphatics. Further, the addition of oxalic acid promoted Cd adsorption, and the effect was concentration dependent. Modifying the verimicompost surface with more adsorption sites might be the main reason. Conversely, citric acid and malic acid showed the ability to inhibit Cd adsorption by vermicompost. Citric acid caused a blocking effect by covering flocculent substances on the vermicompost surface while reducing surface adsorption sites by dissolving mineral components such as iron oxides. However, the action of malic acid did not appear to be related to changes in morphology or the structure of vermicompost. Overall, the results of this study partially explain the limited effectiveness of Cd immobilization within the rhizosphere by vermicompost, and provide theoretical support for regulating rhizosphere environments to improve the effectiveness of vermicompost immobilization of Cd.http://www.sciencedirect.com/science/article/pii/S0147651323010977VermicompostCadmiumPHLow-molecular-weight organic acidAdsorption characteristics |
| spellingShingle | Pan Pan Huizhan Liu Ang Liu Xinchun Zhang Qingmian Chen Guihua Wang Beibei Liu Qinfen Li Mei Lei Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids Ecotoxicology and Environmental Safety Vermicompost Cadmium PH Low-molecular-weight organic acid Adsorption characteristics |
| title | Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids |
| title_full | Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids |
| title_fullStr | Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids |
| title_full_unstemmed | Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids |
| title_short | Rhizosphere environmental factors regulated the cadmium adsorption by vermicompost: Influence of pH and low-molecular-weight organic acids |
| title_sort | rhizosphere environmental factors regulated the cadmium adsorption by vermicompost influence of ph and low molecular weight organic acids |
| topic | Vermicompost Cadmium PH Low-molecular-weight organic acid Adsorption characteristics |
| url | http://www.sciencedirect.com/science/article/pii/S0147651323010977 |
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