A novel Ca/Mn-modified biochar recycles P from solution: mechanisms and phosphate efficiency

Wang, Chengwei; Qiu, Cheng; Song, Zhengguo; Gao, Minling

doi:10.1039/d1em00511a

Cited by 6 publications

(3 citation statements)

References 56 publications

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“…Studies focused on Cd (II) sorption via phosphate-loaded Ca-Mn-impregnated biochar (P s -CMBC; prepared via the phosphate sorption process on CMBC) are limited. Our previous studies prepared Ca-Mn-impregnated biochar by modifying biochar with CaCl 2 and KMnO 4 , which increased the adsorption active sites and microporous structure of CMBC and showed that CMBC had excellent sorption performance in phosphate removal from solution, and that CMBC possesses stable properties and strong buffering capacity [25]. Thus, we hypothesized that P s -CMBC may have more capacity for adsorption of Cd due to the presence of P in the biochar.…”

Section: Introductionmentioning

confidence: 98%

Effective Removal of Cd from Aqueous Solutions Using P-Loaded Ca-Mn-Impregnated Biochar

Qiu,

Wang,

Liu

et al. 2023

Molecules

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Cadmium (Cd) pollution in wastewater has become an increasingly widespread concern worldwide. Studies on Cd (II) removal using phosphate-adsorbed sorbents are limited. This study aimed to elucidate the behaviors and mechanisms of Cd (II) sorption on phosphate-loaded Ca-Mn-impregnated biochar (Ps-CMBC). The Cd (II) sorption on Ps-CMBC reached equilibrium within 2 h and exhibited a higher sorption efficiency than biochar and CMBC. Additionally, the Langmuir isotherm could better describe the Cd (II) adsorption on the sorbents. P75-CMBC had a maximum Cd (II) sorption capability of 70.13 mg·g−1 when fitted by the Langmuir isotherm model, which was approximately 3.18 and 2.86 times greater than those of biochar and CMBC, respectively. Higher pH (5–7) had minimal effect on Cd (II) sorption capacity. The results of characterization analyses, such as SEM-EDS, FTIR, and XPS, suggested that there was a considerable difference in the sorption mechanisms of Cd (II) among the sorbents. The primary sorption mechanisms for biochar, CMBC, and Ps-CMBC included electrostatic attraction and surface complexation; additionally, for Ps-CMBC, Cd (II)-π interactions and coordination of Cd (II) with P=O were critical mechanisms for Cd (II) removal. The results of this study demonstrate that phosphate-loaded CMBC can be used as an effective treatment for heavy metal pollution in aqueous media.

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Section: Introductionmentioning

confidence: 98%

Effective Removal of Cd from Aqueous Solutions Using P-Loaded Ca-Mn-Impregnated Biochar

Qiu,

Wang,

Liu

et al. 2023

Molecules

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“…The growing world population and crop demand increased the phosphorus fertilizer consumption (Xu et al 2018). The global use of phosphorus fertilizer has resulted in the migration of millions of tons of P 2 O 5 from soil into aquatic environment, which increased the phosphate levels in water (Wang et al 2022). Existing studies demonstrated that the content of phosphate in water exceeding 0.02 mg/L would result in eutrophication (Wang et al 2019), triggering the rapid propagation of algae, deterioration of water quality, and ecological equilibrium (Wang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Fe-modified fly ash/cotton stalk biochar composites for efficient removal of phosphate in water: mechanisms and green-reuse potential

Hao

Habibul

et al. 2023

Environ Sci Pollut Res

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Excessive phosphate content input into natural water can lead to the waste of resource and eutrophication. Biochar is a kind of low-cost adsorbents. However, its adsorption capacity for phosphate is low. In order to solve this problem, Fe compounds modi ed y ash/cotton stalk biochar composites (Fe-FBC) were prepared through co-pyrolyzed y ash and cotton stalk at 800 o C, followed by in ltration of FeSO 4 solution. The samples were characterized by Scanning electron microscopy, Brunauer-Emmett-Teller, X-ray diffraction, Fourier-transform infrared spectroscopy, and zeta potential. After modi cation, the hydrophilicity and polarity of Fe-FBC increased. In addition, the pore volume, speci c surface area, and surface functional groups were signi cantly improved. The adsorption process of Fe-FBC for phosphate in water can be well tted by the pseudo-second-order kinetic and Sips isotherm adsorption model, with a maximum adsorption capacity of 47.91 mg/g. Fe-FBC maintained a high adsorption capacity in the pH range of 3-10. The coexisting anions (NO 3 -, SO 4 2-, and Cl -) had negligible effects on phosphate adsorption. The adsorption mechanisms of Fe-FBC include electrostatic attraction, ligand exchange, surface complexation, ion exchange, chemical precipitation and hydrogen bonding. Moreover, the desorption dynamic process of phosphate was investigated, indicating that the phosphate-saturated Fe-FBC could use as slow-release phosphate fertilizer. This study proposed a potentially environmental protection and recycling economy approach, which consists of recycling resources and treating wastes with wastes.

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“…To improve the adsorption property of phosphates, the biochar must be modified. Calcium (Ca), which is an environmentally friendly, cheap, and widely abundant metal, could effectively remove phosphate (P) from solution [11][12][13]. Ca loaded on other carrier materials, such as biochar, can be effective adsorbents for the recovery of phosphorus from wastewater [14].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Removal of Phosphate from Rural Domestic Sewage by Ca-Modified Biochar Derived from Waste Eggshell and Sawdust

Xu,

Liu,

Tang

et al. 2023

Water

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In recent years, in order to improve the rural living environment, rural domestic sewage treatment has received more and more attention in China. However, the standard compliance rate of total phosphorus (TP) in rural domestic sewage after treatment is very low, and TP has become the main pollutant that prevents rural domestic sewage treatment facilities from meeting water pollutants discharge standards. In this study, to prepare calcium-modified biochar composites (E-BC) by one-step pyrolysis, waste eggshell (E) was employed as a calcium source and waste pine sawdust (BC) was employed as a carbon source. The E-BC composites produced were effective in adsorbing phosphate (P) from aqueous solutions in a broad pH range of 3–11, with good adsorption selectivity. E-BC’s adsorption capacity for P increased as the pyrolysis temperature increased from 700 °C to 900 °C, which was attributed to the higher specific surface area and calcium oxide content at higher pyrolysis temperatures. The E-BC sample, which was made from eggshell (filtered through 100 mesh sieves) and pine sawdust (filtered through 100 mesh sieves) with a mass ratio of 2:1 and a pyrolysis temperature of 900 °C, had a maximum adsorption capacity of 301 mg/g. The Langmuir model and pseudo second-order model were the best at describing the adsorption process, and the predominant sorption mechanism for P is the chemisorption reaction of calcium oxide or calcium hydroxide with phosphate to create hydroxyapatite. E-BC can effectively remove P from rural domestic sewage. The total phosphorus (TP) removal rate in rural domestic sewage ranges from 95.3 to 99.5%. After adsorption treatment, the discharge of TP in rural sewage meets the second-grade (TP < 3 mg/L) or even the first-grade (TP < 2 mg/L). This study provides an experimental basis for efficient P removal using E-BC adsorbent materials and suggests possible applications in rural domestic sewage.

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A novel Ca/Mn-modified biochar recycles P from solution: mechanisms and phosphate efficiency

Abstract: The excessive use of phosphate leads to severe environmental issues, such as shortage of phosphorus resources and water eutrophication. In this study, a novel Ca-Mn-impregnated biochar (CMBC) composite was synthesized...

Cited by 6 publications

References 56 publications

Effective Removal of Cd from Aqueous Solutions Using P-Loaded Ca-Mn-Impregnated Biochar

Effective Removal of Cd from Aqueous Solutions Using P-Loaded Ca-Mn-Impregnated Biochar

Fe-modified fly ash/cotton stalk biochar composites for efficient removal of phosphate in water: mechanisms and green-reuse potential

Adsorption Removal of Phosphate from Rural Domestic Sewage by Ca-Modified Biochar Derived from Waste Eggshell and Sawdust

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