Performance and mechanism of a biochar-based Ca-La composite for the adsorption of phosphate from water

Feng, Yi‐Si; Luo, Yuan; He, Qiuping; Zhao, Dixian; Zhang, Keqiang; Shen, Suhung; Wang, Feng

doi:10.1016/j.jece.2021.105267

Cited by 66 publications

(24 citation statements)

References 49 publications

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“…Under acidic conditions, the adsorption capacity varied within 93~96 mg P/L, which decreased to the range of 75–88.5 mg P/L under alkaline conditions. Generally, Ca 2+ -loaded biochar showed poor adsorption capacity for phosphate under acidic conditions with the adsorption capacities of common Ca 2+ -loaded biochar in phosphate solutions having pH < 7 being only 6 mg P/L ~36 mg P/L [ 12 , 23 , 24 ]. Thus, Ca-BC showed 3~15 times higher adsorption capacity for phosphate under acidic conditions in comparison to Ca 2+ -loaded biochar.…”

Section: Resultsmentioning

confidence: 99%

“…Phosphate ion, which is usually negatively charged in solution, can act as a Lewis acid and can form coordination complexes with most metals (Lewis bases). So a host of metallic adsorbents have been developed for the aqueous phase removal of phosphorus resources [ 11 , 12 ]. Among them, Ca, which is a cheap, environmental friendly, and widely abundant metal in the earth’s crust, has been found to be efficient for phosphate removal from solution [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Ca 2+ is the form in which Ca is often loaded onto biochar; however, the pH of the water has great influence on the adsorption of phosphate by Ca 2+ -loaded biochar, and the adsorption capacity at lower pH range is usually poor [ 21 , 22 ]. Feng et al obtained a maximum adsorption capacity of only 6 mg P/g for Ca 2+ -loaded composites of sheep manure biochar when the solution pH was less than 7 [ 12 ]. Ca 2+ -loaded hyacinth ( Eichhornia crassipes ) biochar and sludge biochar prepared by Ramirez-Muñoz and Antunes showed respective maximum adsorption capacities of 17 mg P/g, and 36 mg P/g were obtained for a solution having a pH < 7 [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Oyster Shell Modified Tobacco Straw Biochar: Efficient Phosphate Adsorption at Wide Range of pH Values

Feng

Zhang

et al. 2022

IJERPH

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In order to improve the phosphate adsorption capacity of Ca-loaded biochar at a wide range of pH values, Ca (oyster shell) was loaded as Ca(OH)2 on the tobacco stalk biochar (Ca-BC), which was prepared by high-temperature calcination, ultrasonic treatment, and stirring impregnation method. The phosphorus removal performance of Ca-BC adsorption was studied by batch adsorption experiments, and the mechanism of Ca-BC adsorption and phosphorus removal was investigated by SEM-EDS, FTIR, and XRD. The results showed that after high-temperature calcination, oyster shells became CaO, then converted into Ca(OH)2 in the process of stirring impregnation and had activated the pore expansion effect of biochar. According to the Langmuir model, the adsorption capacity of Ca-BC for phosphate was 88.64 mg P/g, and the adsorption process followed pseudo-second-order kinetics. The Ca(OH)2 on the surface of biochar under the initial pH acidic condition preferentially neutralizes with H+ acid-base in solution, so that Ca-BC chemically precipitates with phosphate under alkaline conditions, which increases the adsorption capacity by 3–15 times compared with other Ca-loaded biochar. Ca-BC phosphate removal rate of livestock wastewater (pig and cattle farms) is 91~95%, whereas pond and domestic wastewater can be quantitatively removed. This study provides an experimental basis for efficient phosphorus removal by Ca-modified biochar and suggesting possible applications in real wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oyster Shell Modified Tobacco Straw Biochar: Efficient Phosphate Adsorption at Wide Range of pH Values

Feng

Zhang

et al. 2022

IJERPH

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“…The organic carbon in the original biomass may be largely removed during pyrolysis, resulting in higher pore volume and pore size, which is consistent with the previous research conclusions. ,, Thus, the material became denser after Ca was introduced. We also believe that the biochar surface was modified by the hydroxyapatite (CaCl 2 (H 2 O) 6 ) (which was detected by X-ray diffraction (XRD), as discussed below), which also contributed to the surface area and porosity decrease. This is because CaCl 2 (H 2 O) 6 blocked the microporous structure of biochar …”

Section: Resultsmentioning

confidence: 99%

“…FTIR spectra of BC and BC-5 (before and after adsorption experiments) showed peaks at 3419 and 1626 cm –1 (see Figure a) , belonging to −OH and −CH 2 – vibrations, respectively. The asymmetric tensile P–O vibrations of H 2 PO 4 – and HPO 4 2– groups in biochar, detected at 1041 cm –1 , , weakened after the biochar was modified with oyster shells but became stronger after the modified biochar was used for P adsorption experiments. The FTIR spectra of BC-5 + P showed peaks at 601 and 564 cm –1 corresponding to the symmetric O–P–O vibrations of the PO 4 3– group .…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Phosphate in Aqueous Phase by Biochar Prepared from Sheep Manure and Modified by Oyster Shells

et al. 2021

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Sheep manure and oyster shells as C and Ca sources, respectively, were used to obtain Ca-enriched biochar materials with a high dephosphorization efficiency. This approach is helpful for the utilization of livestock manure and shell solid waste as well as for creating highly adsorbent materials. The results show that as the Ca content in biochar was increased, the material's phosphate adsorption capacity increased. The maximum adsorption efficiency reached 94%. The highest adsorption capacity (calculated using Langmuir fitting) of the material containing 1:1 biochar/oyster shell weight ratio reached 146.3 mg P/g. With the increase of the pH value of phosphate solution, the adsorption capacity of the sample gradually increased to 89.5−93.3 mg P/g. The adsorption occurred mainly by complexation. The results of this work provide insights into livestock manure and shell solid waste utilization, which yields a material with useful adsorption properties that can be applied for the removal of phosphate and other inorganics from water.

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One‐Pot Synthesis of ZnO‐Activated Eggshell@kaolinite: Sorbents for Phosphate Capture in Water

Bayode,

Badamasi,

Olusola

et al. 2023

Chem Eng & Technol

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The availability of colossal amounts of phosphate in water bodies has led to serious environmental challenges all over the world. In this study, a new adsorbent was synthesized using treated kaolinite clay, pulverized eggshells, and ZnCl2. Surface characterizationof these adsorbents showed the availability of functional moieties, morphological variations, pore sizes, particle sizes, etc. Adsorption of phosphate occurs via multiple mechanisms, comprising ligand exchange, complexation, hydrogen bonding, and electrostatic interaction, among others. The effect of pH, showed that maximum adsorption of 93.3 % was achieved at pH 3.0. It was also shown that these cost‐effective adsorbents could be regenerated in six cycles, hence increasing their applicability.

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Performance and mechanism of a biochar-based Ca-La composite for the adsorption of phosphate from water

Cited by 66 publications

References 49 publications

Oyster Shell Modified Tobacco Straw Biochar: Efficient Phosphate Adsorption at Wide Range of pH Values

Oyster Shell Modified Tobacco Straw Biochar: Efficient Phosphate Adsorption at Wide Range of pH Values

Adsorption of Phosphate in Aqueous Phase by Biochar Prepared from Sheep Manure and Modified by Oyster Shells

One‐Pot Synthesis of ZnO‐Activated Eggshell@kaolinite: Sorbents for Phosphate Capture in Water

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