Influence of dissolved organic matter, kaolinite, and iron oxides on aggregation and transport of biochar colloids in aqueous and soil environments

Yan, Chaorui; Li, Yang; Sharma, Prabhakar; Chen, Qing; Li, Baoguo; Shang, Jianying

doi:10.1016/j.chemosphere.2022.135555

Cited by 16 publications

(4 citation statements)

References 60 publications

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“…The fine particle re-arrangements after the intensive milling of T2 and T3 samples induce a relative increase in kaolinite amount at 36% and incorporate the finest fractions resulting from lepidocrocite cluster disaggregation as observed in the elemental map in Figure 6b, in good agreement with observations in the literature [33,34]. Thus, the filler/matrix ratio decreases to 1.27, assuring an optimal level for the microstructure binding.…”

Section: Discussionsupporting

confidence: 89%

Conditioning Influence of Kaolinite Matrices on Flexural Strength of Raw Pressed Slurry Collected from Ceramic Tile Production Wastewater

Avram,

Barbu Tudoran,

Cuc

et al. 2024

J. Compos. Sci.

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Kaolinite is able to assure the high binding affinity of the filler particles of raw ceramic bodies. It acts as a matrix that strongly holds the other constituents’ particles in a compact structure. The slurry samples were characterized by XRD, mineralogical microscopy and SEM coupled with an EDX elemental analysis. The slurry collected from the ceramic tile production wastewaters had a significant amount of kaolinite (36%), mostly fine particles of 3 µm, less surrounding quartz (37%) and mullite (19%) particles of 5–100 µm in diameter and traces of lepidocrocite (8%). It is a dense paste with a relative moisture of 25%. The square bar of the slurry as received, pressed at a load of 350 N, had a flexural strength of 0.61 MPa. Increasing the moisture to 33% using regular water, followed by mechanical attrition at 2000 rpm for 5 min, resulted in a porous bar with a flexural strength of 0.09 MPa; by increasing the attrition speed to 6000 rpm, the microstructural homogenization was improved and the flexural strength was about 0.68 MPa. It seems that regular water does not assure an optimal moisture for the kaolinite matrix conditioning. Therefore, we used technological water at pH = 10, a moisture of 33% and attrition at 6000 rpm for 5 min, and the bar pressed at a load of 350 N had a flexural strength of 1.17 MPa. The results demonstrate that the bar moistened with technological water and an attrition regime assured a proper conditioning for the kaolinite matrix, achieving the optimal binding of the quartz and mullite particles under the pressing load. Bars with the optimal mixture were pressed at several loads, including 70, 140, 210 and 350 N, and the flexural strength was progressively increased from 0.56 MPa to 1.17 MPa. SEM fractography coupled with atomic force microscopy (AFM) revealed that the optimal moisture facilitated a proper kaolinite particle disposal regarding the quartz and mullite filler particles, and the progressive load assured the strong binding of the finest kaolinite platelets onto their surface.

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Section: Discussionsupporting

confidence: 89%

Conditioning Influence of Kaolinite Matrices on Flexural Strength of Raw Pressed Slurry Collected from Ceramic Tile Production Wastewater

Avram,

Barbu Tudoran,

Cuc

et al. 2024

J. Compos. Sci.

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“…This difference was attributed to the different number and activity of their functional groups such as carboxylic and phenolic groups. 26 The adsorption in sandy loam was largely unaffected by changes in humic acid and temperature. A plateau in the adsorption curves for sandy loam can be observed with the addition of 50 mg kg −1 of humic acid to the soil, while the adsorption in loamy soils was slightly slower.…”

Section: Resultsmentioning

confidence: 98%

“…5,34 The long aging of 1,2-DCA stabilizes its binding with soils, and the soil further absorbs the FA and HA molecules bound to 1,2-DCA from the aqueous phase, thus creating equilibrium for the processes of adsorption-desorption. 13,26 3.6. The adsorption-desorption of 1,2-DCA on soils in model saturated aquifer…”

Section: Desorption Of 12-dca From Soil In Watermentioning

confidence: 99%

Influence of organic matters on the adsorption–desorption of 1,2-dichloroethane on soil in water and model saturated aquifer

Huang,

Liang,

Yun

et al. 2024

RSC Adv.

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“…Under the attack of these reactive species, polymer carbon chains of MPs are continuously destroyed, and the exposed active sites are gradually occupied by a large number of oxygen functional groups, resulting in deeper cracking and fragmentation, which is one of the crucial mechanisms of MP photoaging. − The two-sided effects of DOM exhibited in the photoaging of coexisting MPs are mainly attributed to significant differences in photochemical reactivity, electron transfer capacity, and yield of reactive species. These critical factors are greatly modulated by the MW of DOM. , Furthermore, previous studies demonstrated that the MW of DOM can significantly affect the stability and mobility of carbon-based materials (e.g., biochar colloids and graphene oxide). − Consequently, it is reasonable to assume that the photoaging of MPs under DOM addition will vary with the MW of DOM.…”

Section: Introductionmentioning

confidence: 99%

Molecular Weights of Dissolved Organic Matter Significantly Affect Photoaging of Microplastics

Pan,

Zhang,

Qiu

et al. 2024

Environ. Sci. Technol.

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The fate of ubiquitous microplastics (MPs) is largely influenced by dissolved organic matter (DOM) in aquatic environments, which has garnered significant attention. The reactivity of DOM is reported to be greatly regulated by molecular weights (MWs), yet little is known about the effects of different MW DOM on MP aging. Here, the aging behavior of polystyrene MPs (PSMPs) in the presence of different MW fulvic acids (FAs) and humic acids (HAs) was systematically investigated. Under ultraviolet (UV) illumination, O/C of PSMPs aged for 96 h surged from 0.008 to 0.146 in the lower MW FA (FA <1kDa ) treatment, suggesting significant PSMP aging. However, FA exhibited a stronger effect on facilitating PSMP photoaging than HA, which can be attributed to the fact that FA <1kDa contains more quinone and phenolic moieties, demonstrating a higher redox capacity. Meanwhile, compared to other fractions, FA <1kDa was more actively involved in the increase of different reactive species yields by 50−290%, including •OH, which plays a key role in PSMP photoaging, and contributed to a 25% increase in electron-donating capacity (EDC). This study lays a theoretical foundation for a better understanding of the environmental fate of MPs.

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Influence of dissolved organic matter, kaolinite, and iron oxides on aggregation and transport of biochar colloids in aqueous and soil environments

Cited by 16 publications

References 60 publications

Conditioning Influence of Kaolinite Matrices on Flexural Strength of Raw Pressed Slurry Collected from Ceramic Tile Production Wastewater

Conditioning Influence of Kaolinite Matrices on Flexural Strength of Raw Pressed Slurry Collected from Ceramic Tile Production Wastewater

Influence of organic matters on the adsorption–desorption of 1,2-dichloroethane on soil in water and model saturated aquifer

Molecular Weights of Dissolved Organic Matter Significantly Affect Photoaging of Microplastics

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