A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components
Heavy metals and metalloids are common cooccurrence in contaminated soils, making their behaviors more complex than their individual presences. Adsorption to soil minerals and organic components determines the solubility and mobility of heavy metals. However, little information is available regardin...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2022-01-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | http://dx.doi.org/10.1155/2022/9131597 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846098007934631936 |
|---|---|
| author | Min Zhou Ruijia Yang Xiaoyu Tan Boqing Tie Ming Lei Huihui Du |
| author_facet | Min Zhou Ruijia Yang Xiaoyu Tan Boqing Tie Ming Lei Huihui Du |
| author_sort | Min Zhou |
| collection | DOAJ |
| description | Heavy metals and metalloids are common cooccurrence in contaminated soils, making their behaviors more complex than their individual presences. Adsorption to soil minerals and organic components determines the solubility and mobility of heavy metals. However, little information is available regarding coadsorbing metals (e.g., Cd) and metalloids (e.g., Sb) to soil components, and whether there is a universal coadsorption rule needs to be illuminated. This study investigated the coadsorption behaviors of Cd(II) and Sb(V) to goethite, kaolinite, and bacteria (Bacillus cereus) at both acidic (pH 4.5) and alkaline pH (pH 8.5). Equilibrium adsorption experiments, coupled with scanning electron microscopy- (SEM-) energy-dispersive X-ray spectrum (EDS) and X-ray photoelectron spectroscopy (XPS), were applied to determine the batch adsorption phenomena and possible mechanisms. Batch results showed that Cd(II) adsorption was greater at pH 8.5 whereas Sb(V) adsorption was greater at pH 4.5. The presence of Cd or Sb promoted each other’s adsorption to goethite, kaolinite, and bacteria, but slight differences were that Sb(V) preferred to enhance Cd(II) adsorption at acidic pH, whereas Cd(II) was more able to increase Sb(V) adsorption at alkaline pH. SEM-EDS analyses further showed that the distribution of Cd and Sb was colocalized. The surface FeOH, AlOH, and COOH groups participated in the binding of Cd(II) and Sb(V), probably through the formation of inner-sphere complexes. Two possible ternary complexes, i.e., sorbent-Cd2+-Sb(OH)6– and sorbent-Sb(OH)6–-Cd2+, were possibly formed. Both the charge effect and the formation of ternary complexes were responsible for the collaborative coadsorbing of Cd-Sb. The universal synergistic rule obtained suggests that current models for predicting Cd(II) or Sb(V) sequestration based on single systems may underestimate their solid-to-liquid distribution ratio in a coexistence situation. The results obtained have important implications for understanding the chemical behavior of Sb and Cd in contaminated soils. |
| format | Article |
| id | doaj-art-c27e315e362b4f239578897a48cf6f7d |
| institution | Kabale University |
| issn | 2048-4038 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-c27e315e362b4f239578897a48cf6f7d2025-01-02T02:57:15ZengSAGE PublishingAdsorption Science & Technology2048-40382022-01-01202210.1155/2022/9131597A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic ComponentsMin Zhou0Ruijia Yang1Xiaoyu Tan2Boqing Tie3Ming Lei4Huihui Du5College of Resources and EnvironmentCollege of Resources and EnvironmentCollege of Resources and EnvironmentCollege of Resources and EnvironmentCollege of Resources and EnvironmentCollege of Resources and EnvironmentHeavy metals and metalloids are common cooccurrence in contaminated soils, making their behaviors more complex than their individual presences. Adsorption to soil minerals and organic components determines the solubility and mobility of heavy metals. However, little information is available regarding coadsorbing metals (e.g., Cd) and metalloids (e.g., Sb) to soil components, and whether there is a universal coadsorption rule needs to be illuminated. This study investigated the coadsorption behaviors of Cd(II) and Sb(V) to goethite, kaolinite, and bacteria (Bacillus cereus) at both acidic (pH 4.5) and alkaline pH (pH 8.5). Equilibrium adsorption experiments, coupled with scanning electron microscopy- (SEM-) energy-dispersive X-ray spectrum (EDS) and X-ray photoelectron spectroscopy (XPS), were applied to determine the batch adsorption phenomena and possible mechanisms. Batch results showed that Cd(II) adsorption was greater at pH 8.5 whereas Sb(V) adsorption was greater at pH 4.5. The presence of Cd or Sb promoted each other’s adsorption to goethite, kaolinite, and bacteria, but slight differences were that Sb(V) preferred to enhance Cd(II) adsorption at acidic pH, whereas Cd(II) was more able to increase Sb(V) adsorption at alkaline pH. SEM-EDS analyses further showed that the distribution of Cd and Sb was colocalized. The surface FeOH, AlOH, and COOH groups participated in the binding of Cd(II) and Sb(V), probably through the formation of inner-sphere complexes. Two possible ternary complexes, i.e., sorbent-Cd2+-Sb(OH)6– and sorbent-Sb(OH)6–-Cd2+, were possibly formed. Both the charge effect and the formation of ternary complexes were responsible for the collaborative coadsorbing of Cd-Sb. The universal synergistic rule obtained suggests that current models for predicting Cd(II) or Sb(V) sequestration based on single systems may underestimate their solid-to-liquid distribution ratio in a coexistence situation. The results obtained have important implications for understanding the chemical behavior of Sb and Cd in contaminated soils.http://dx.doi.org/10.1155/2022/9131597 |
| spellingShingle | Min Zhou Ruijia Yang Xiaoyu Tan Boqing Tie Ming Lei Huihui Du A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components Adsorption Science & Technology |
| title | A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components |
| title_full | A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components |
| title_fullStr | A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components |
| title_full_unstemmed | A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components |
| title_short | A Universal Synergistic Rule of Cd(II)-Sb(V) Coadsorption to Typical Soil Mineral and Organic Components |
| title_sort | universal synergistic rule of cd ii sb v coadsorption to typical soil mineral and organic components |
| url | http://dx.doi.org/10.1155/2022/9131597 |
| work_keys_str_mv | AT minzhou auniversalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT ruijiayang auniversalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT xiaoyutan auniversalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT boqingtie auniversalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT minglei auniversalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT huihuidu auniversalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT minzhou universalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT ruijiayang universalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT xiaoyutan universalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT boqingtie universalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT minglei universalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents AT huihuidu universalsynergisticruleofcdiisbvcoadsorptiontotypicalsoilmineralandorganiccomponents |