Enhanced Fluoride Adsorption on Aluminum-Impregnated Kenaf Biochar: Adsorption Characteristics and Mechanism

Choi, Moon-Yeong; Lee, Changgu; Park, Seong‐Jik

doi:10.1007/s11270-022-05906-0

Cited by 8 publications

(3 citation statements)

References 97 publications

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“…With minute amounts (0.05–0.07 mg/L), enhancing the hardness of tooth enamel and effectively preventing dental caries. However, excessive fluorine intake can lead to dental fluorosis and osteofluorosis, and can adversely affecting the immune system, kidneys, and gastrointestinal tract [ 2 , 3 ]. Human exposure to fluorine primarily occurs through food and drinking water, and soils become a significant source of fluorine as soils can affect the groundwater and food in many regions.…”

Section: Introductionmentioning

confidence: 99%

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Cui,

Zhang,

et al. 2024

PLoS ONE

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With increasing global awareness of soil health, attention must be paid to fluorine exposure in soils, which poses a threat to human health. Therefore, this study aimed to study the fluorine adsorption characteristics of swine manure and straw biochars and their impact on fluorine adsorption-desorption in soil with batch experiments. The biochar samples originated from high-temperature anaerobic cracking of swine manure (350°C, 500°C, and 650°C) and straw (500°C). Results indicated that the adsorption of soil fluorine reached adsorption equilibrium at around 4 h after the mixing of swine manure and straw biochar. Fluorine adsorption kinetics using these biochars conformed to the quasi-two-stage kinetic model. The fluorine adsorption kinetics for biochar-treated soils conformed to the double-constant equation and the Elovich equation, and the soil treated with straw biochar showed the fastest fluorine adsorption rate. The adsorption isotherms of fluorine for biochars and biochar-treated soils could be fitted by the isothermal adsorption model of Langmuir and Freundlich. The maximal equilibrium quantity of fluorine was 73.66 mg/g for swine manure biochar. The soil, adding with 2% of swine manure biochar achieved with showed at 650°C had the smallest adsorption. This study also shows that the adsorption of fluorine by biochar gradually decreased with the increase of pH. Comparing with other factors, the mixture pH with biochars added had a significant effect on fluorine adsorption. The decreased fluorine adsorption capacities for soils treated with swine manure and straw biochars were closely related to the increased pH in soils after adding biochars. Considering the fluorine threat in soil, this study provides a theoretical basis for the application of biochars on soil fluorine adsorption.

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Section: Introductionmentioning

confidence: 99%

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Cui,

Zhang,

et al. 2024

PLoS ONE

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“…Biochar has emerged as an innovative and cost-effective material for environmental remediation with its oxygen-containing functional groups and substantial speci c surface area (Wang et food waste (Meilani et al 2021) and aluminum-impregnated kenaf biochar (Choi et al 2022). The uoride adsorption performance of these biochars differed from the raw materials, among which sludge biochar had the largest adsorption capability (Jing et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Enhancing Fluoride Removal from Wastewater using Aluminum-Yttria-Amended Sludge Biochar

Li,

Song,

Tong

et al. 2023

Preprint

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This study explored the potential of utilizing aluminum-yttria-amended sludge biochar (Al/Y-CSBC) for efficient fluoride removal from wastewater. The adsorption kinetics of fluoride on modified Al/Y-CSBC followed the pseudo-second-order model, while the adsorption isotherm conformed to the Freundlich equation. Remarkably, the material exhibited excellent fluoride removal performance over a wide pH range, achieving a maximum adsorption capacity of 55.24 mg•g-1. Moreover, Al/Y-CSBC demonstrated exceptional reusability, maintaining 95% removal efficiency even after six regeneration cycles. The fluoride adsorption mechanism involved ion exchange, surface complexation, and electrostatic adsorption interactions. The activation and modification processes significantly increased the specific surface area of Al/Y-CSBC, leading to a high isoelectric point (pHpzc = 9.14). The incorporation of aluminum and yttrium metals exhibited a novel approach, enhancing the adsorption capacity for fluoride ions due to their strong affinity. Furthermore, the dispersing effect of biochar played a crucial role in improving defluoridation efficiency by enhancing accessibility to active sites. These findings substantiate the significant potential of Al/Y-CSBC for enhanced fluoride removal from wastewater.

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“…Thus, biochars derived from different raw materials exhibit varying adsorption capacities for nitrogen and phosphorus [ 20 ]. To achieve simultaneous adsorption, biochars have been modified with metal cations such as iron [ 21 ], calcium [ 22 ], aluminium [ 23 ] and magnesium [ 24 ], which remarkably enhance their pollutant adsorption capacity. Among them, calcium is a versatile resource known for its low cost and ease of operation, and it exhibits remarkable binding capabilities for phosphorus [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption characteristics and mechanism of ammonia nitrogen and phosphate from biogas slurry by Ca2+-modified soybean straw biochar

Wu,

Ye,

Wang

et al. 2023

PLoS ONE

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The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca2+-modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca2+-modified soybean straw biochar exhibited excellent adsorption performance for NH4+–N (103.18 mg/g) and PO43−−P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir–Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.

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Enhanced Fluoride Adsorption on Aluminum-Impregnated Kenaf Biochar: Adsorption Characteristics and Mechanism

Cited by 8 publications

References 97 publications

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Enhancing Fluoride Removal from Wastewater using Aluminum-Yttria-Amended Sludge Biochar

Adsorption characteristics and mechanism of ammonia nitrogen and phosphate from biogas slurry by Ca2+-modified soybean straw biochar

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