Effects of carbon nanotubes on phosphorus adsorption behaviors on aquatic sediments

Qian, Jin; Li, Kun; Wang, Peifang; Wang, Chao; Shen, Mengmeng; Liu, Jingjing; Tian, Xin; Lu, Bianhe

doi:10.1016/j.ecoenv.2017.04.017

Cited by 12 publications

(1 citation statement)

References 54 publications

(63 reference statements)

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“…The isotherm data fitting adopts the Langmuir and Freundlich model [19] . The adsorption isotherm is shown in Figure 4, and the fitting data results are shown in Table 4.It can be seen that the Langmuir model is effective for the adsorption of copper ions on microplastics.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Adsorption and Desorption Behavior of Microplastics on Copper Ions in Aqueous Solution

2023

AJMC

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The environmental pollution caused by microplastics has received extensive attention around the world, and it is of great significance to study the adsorption and desorption of heavy metals by microplastics to clarify the environmental behaviour and toxic effects of heavy metals. In this paper, the adsorption and desorption process and mechanism of microplastics (species, oxygen-containing functional groups, crystallinity, aging state) on copper ions in aqueous solution were studied, and six microplastics were selected, namely refractory microplastics, polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polypropylene (PP) and degradable microplastics polybutylene succinate (PBS) and polybutylene terephthalate-butylene adipate (PBAT). The adsorption results showed that the adsorption capacity of copper ions by six microplastics was arranged as PVC>PBAT> PBS> PS>ABS>PMMA, and the adsorption capacity of copper ions by each microplastic (MPs) after aging was higher than that of its fresh state. The desorption results showed that the larger the adsorption capacity, the greater the desorption amount. The desorption rate of copper ions by PVC, PBS and PBAT was lower than that of PS, ABS and PMMA. The desorption amount and desorption rate of degradable MPs to copper ions were higher than those of refractory MPs. The desorption rate of copper ions by each microplastic after aging is lower than that of fresh state. It shows that refractory microplastics, aging MPs have a stronger carrier effect on copper ions. In addition, the adsorption kinetics of copper ions by microplastics mostly conform to the quasi-secondary model, some conform to the quasi-primary model, and the adsorption and desorption isotherms basically conform to the Langmuir and Freundlich models.

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Section: Adsorption Isothermmentioning

confidence: 99%

Adsorption and Desorption Behavior of Microplastics on Copper Ions in Aqueous Solution

2023

AJMC

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Unraveling adsorption behavior and mechanism of perfluorooctane sulfonate (PFOS) on aging aquatic sediments contaminated with engineered nano-TiO2

Qian

Wang

et al. 2018

Environ Sci Pollut Res

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Engineered nano-TiO (Enano-TiO) have inevitably discharged into aquatic sediments that resulted from their widespread use. The physicochemical characteristics of sediments might be changed because of remarkable properties of Enano-TiO and affected by the aging of sediments, thereby altering the environmental behavior and bioavailability of other pollutants such as perfluorooctane sulfonate (PFOS) in sediments. Here, adsorption behavior and mechanism of PFOS on aging aquatic sediments spiked with Enano-TiO at a weight ratio of 5.0% were investigated. The results showed that Enano-TiO significantly altered zero points of charge (pH) and pore surface properties of sediments, manifested as pH, the total surface area (S), the micro-pore surface area (S), and the external surface area (S) of sediment particles contaminated with Enano-TiO clearly increased, instead average pore size decreased. Rapid intra-particle diffusion processes were well fitted by the pseudo-second-order rate model with the sorption rate (K) following the order single (5.764 mg/(g·h)) > binary systems (3.393 mg/(g·h)). Freundlich model best described the sorption isotherm data with the larger sorption capacity (K) and sorption affinity (1/n) of sediments spiked with Enano-TiO than that of sediments only. Additionally, Enano-TiO changed the adsorption thermodynamics of PFOS on the sediments with the absolute value of ∆G, ∆H, and ∆S increased. Fourier transform infrared (FT-IR) spectroscopy suggested possible formation of a negative charge-assisted H-bond between PFOS and the functionalities on sediment surfaces, including O-H of carboxyl, alcohol, phenols, and chemisorbed HO as well as carbonyl groups (C=O) of ketone groups. Furthermore, the multilayer sorption of PFOS on sediments contaminated with Enano-TiO is plausible because of bridging effect of Cu and Pb.

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Sustainable adsorbent frameworks based on bio-resourced materials and biodegradable polymers in selective phosphate removal for waste-water remediation

Das,

Chauhan,

Staudinger

et al. 2024

Environ Sci Pollut Res

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Effects of carbon nanotubes on phosphorus adsorption behaviors on aquatic sediments

Cited by 12 publications

References 54 publications

Adsorption and Desorption Behavior of Microplastics on Copper Ions in Aqueous Solution

Adsorption and Desorption Behavior of Microplastics on Copper Ions in Aqueous Solution

Unraveling adsorption behavior and mechanism of perfluorooctane sulfonate (PFOS) on aging aquatic sediments contaminated with engineered nano-TiO2

Sustainable adsorbent frameworks based on bio-resourced materials and biodegradable polymers in selective phosphate removal for waste-water remediation

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