Investigation of 3-aminopropyltriethoxysilane modifying attapulgite for Congo red removal: Mechanisms and site energy distribution

Yang, Shang Lei; Zhao, Feng; Sang, Qianqian; Zhang, Yuan; Chang, Le; Huang, Dajian; Mu, Bin

doi:10.1016/j.powtec.2021.01.046

Cited by 37 publications

(13 citation statements)

References 30 publications

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“…The sorption site energy in fresh and aged SLHC (E * ) decreased gradually with Q e in Fig. 3c, firstly indicating heterogeneous sorption site energy distribution in the fresh and aged SLHC surface and further suggesting Cd was preferentially sorbed to the high-energy sorption site and then to the low-energy sorption site (Yang et al 2021;Zhou et al 2019). Comparing the average site energy μ(E * ) of Cd between fresh and aged SLHC, it was found that the longer aging time, the more considerable the average site energy μ(E * ), illustrating that natural aging promoted more significant Cd sorption on SLHC.…”

Section: Natural Aging Effect On the Sorption Behavior Of Slhcmentioning

confidence: 92%

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Wang

Shang

Xie

et al. 2022

Biochar

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Hydrochar has potential applications in soil improvement and heavy metal remediation. Hydrochar would undergo the process of aging when introduced into the soil, altering its properties. However, recent studies have focused mainly on the artificial aging of hydrochar, which could not reveal the cumulative effect of multiple environmental factors. Therefore, the periodical monitoring of the property and sorption behavior of hydrochar after amending soils is necessary to better understand the multifaceted mechanisms associated with the natural aging of hydrochar. This study selected the sludge-derived hydrochar (SLHC) as a typical hydrochar and applied a 16-month rice–wheat–rice rotation to mimic the natural aging of hydrochar, focusing on changing properties and cadmium (Cd) sorption and literature contrast between aging strategies and biochar types. The porosity, O abundance, and ash content of 16-month aged SLHC increased by 37%, 47%, and 8.5%, respectively, facilitating Cd sorption due to surface complexation, pore sorption, and precipitation. The sorption percentage of Cd to SLHC was in the range of 11–14% for SLHC-A0 and increased to 17–31% for SLHC-A4 and 20–32% for SLHC-A16 after natural aging. The natural aging of SLHC induced by ash content played an essential role in Cd sorption site heterogeneity. Linear regression analysis showed that aging strategies on sorption behavior significantly differed between biochars. Thus, studies involving natural aging with multiple environmental factors are preferred over those involving chemical or biological aging. Future studies should continue to explore the mechanisms of natural aging-induced heavy metal sorption between hydrochar and pyrochar. These results improve insights to appraise the potential of SLHC as soil amendments to alleviate the adverse effects of heavy metal contamination and provide an essential basis for researchers and staff in soil management and environmental prevention. Graphical Abstract

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Section: Natural Aging Effect On the Sorption Behavior Of Slhcmentioning

confidence: 92%

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Wang

Shang

Xie

et al. 2022

Biochar

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“…In summary, the pseudo-second-order model refers to the valence potential formed by sharing or exchanging electrons in the form of covalent forces between the adsorbent and the adsorbate, and ion exchange, while the Elovlich model explains the chemisorption kinetics on heterogeneous surface adsorbents [72]. These results show that chemical adsorption plays an important role in the adsorption of HA, FA, and TA onto PS MPs, and the adsorption process is affected by many factors [73].…”

Section: Adsorption Kinetics Analysismentioning

confidence: 85%

Adsorption of Tannic Acid and Macromolecular Humic/Fulvic Acid onto Polystyrene Microplastics: A Comparison Study

et al. 2022

Water

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Dissolved organic matter (DOM) has been widely reported to influence the environmental behavior of microplastics (MPs), but little is known about the properties and mechanisms of interaction between specific DOM components and MPs. Here, we studied the adsorption of three representative DOM components (humic acid, HA; fulvic acid, FA; and tannic acid, TA) on polystyrene (PS) MPs in batch adsorption experiments. Results revealed that HA/FA adsorption was greater under acidic conditions, while higher TA adsorption on PS was found at pH 4 and 6. The divalent cation (Ca2+) exerted a more prominent role in enhancing HA, FA, and TA adsorption on PS than did monovalent ones (K+ and Na+). The adsorption process fitted well with the Freundlich isotherm model and the pseudo-second-order kinetics model. The adsorption site heterogeneity was evaluated using the site energy distribution analysis based on the Freundlich model. The greater binding ability of HA on the PS surface caused a more negatively charged surface than FA/TA, as reflected by Zeta potential values. The findings of this study not only provide valuable information about the adsorption behavior and interaction processes of various DOM components on PS MPs, but also aid our efforts to evaluate the environmental behaviors of MPs.

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“…In the present work, to investigate the equilibrium condition of anionic dyes (CR and SFL) onto FCS hydrogel, two types of isotherms including Freundlich and Langmuir isotherm models were evaluated. The Langmuir isotherm model can be regarded as a single layer adsorption system onto a homogeneous surface, while the Freundlich model are considered as a heterogeneous multi layers adsorption system [72]. As we can see in Fig.…”

Section: Adsorption Studymentioning

confidence: 99%

Enhanced Macroporous Cationic Chitosan Hydrogel by Freezing and Thawing Method with Superadsorption Capacity for Anionic Dyes

et al. 2022

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In this work, we have developed a simple method to prepare cationic chitosan hydrogel with interconnected porous structure using freeze-thaw process and the obtained hydrogel was named FCS hydrogel. Scanning electron microscopy (SEM) imaging revealed that the synthesized hydrogel demonstrated interconnected porous structure in the range of 5-20 µm. We also showed that the FCS hydrogel exhibits pH responsiveness behavior, and demonstrated reversible swelling and de-swelling behaviors maintaining their mechanical stability. We demonstrate that the FCS hydrogel swelling capacity decreased at alkaline pH and increased with a decrease in the pH value. Besides, the FCS hydrogel presented speci c surface area of 78.25 ±8.75 m 2 g −1 , due to the cryogenic treatment of glutaraldehyde cross-linked chitosan hydrogel could increase the surface area and permeability of composite hydrogel and then strongly increasing the adsorption capacity. Subsequently, the FCS monolithic hydrogel tested dyes removal, which provides a high removal e ciency towards anionic dyes including congo red (CR) and sodium uorescein (SFL) dyes. Signi cantly, we show that the FCS hydrogel could be regenerated and reused as an adsorbent for wastewater treatment without signi cant loss of pollutants removal e ciency over a number of adsorption and washing cycles. This study offers a promising environmental friendly and sustainable interconnected porous hydrogel for anionic dye removal from wastewater.

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Investigation of 3-aminopropyltriethoxysilane modifying attapulgite for Congo red removal: Mechanisms and site energy distribution

Cited by 37 publications

References 30 publications

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

Adsorption of Tannic Acid and Macromolecular Humic/Fulvic Acid onto Polystyrene Microplastics: A Comparison Study

Enhanced Macroporous Cationic Chitosan Hydrogel by Freezing and Thawing Method with Superadsorption Capacity for Anionic Dyes

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