Capture and recover dissolved phosphorous from aqueous solutions by a designer biochar: Mechanism and performance insights

Yang, Simin; Katuwal, Sarmila; Zheng, Wei; Sharma, Brajendra K.; Cooke, Richard A.

doi:10.1016/j.chemosphere.2021.129717

Cited by 15 publications

(19 citation statements)

References 42 publications

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“…1g). The FBC showed a typical biochar characteristic peak (Yang et al 2021). The MFBC showed the typical diffraction peaks of MgO crystals (JCPDS 01-089-7746), including 2 thetas of 36.86° (111), 42.83° (200), 62.17° (220), 74.52° (311), and 78.45° (222) crystal plane diffraction peaks.…”

Section: Biochar Characterizationmentioning

confidence: 99%

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Fang

Ali

Gao

et al. 2022

Biochar

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Conversion of organic waste into engineered metal-biochar composite is an effective way of enhancing biochar’s efficiency for adsorptive capture of phosphorus (P) from aqueous media. Thus, various strategies have been created for the production of metal-biochar composites; however, the complex preparation steps, high-cost metal salt reagent application, or extreme process equipment requirements involved in those strategies limited the large-scale production of metal-biochar composites. In this study, a novel biochar composite rich in magnesium oxides (MFBC) was directly produced through co-pyrolysis of magnesite with food waste; the product, MFBC was used to adsorptively capture P from solution and bio-liquid wastewater. The results showed that compared to the pristine food waste biochar, MFBC was a uniformly hybrid MgO biochar composite with a P capture capacity of 523.91 mg/g. The capture of P by MFBC was fitted using the Langmuir and pseudo-first-order kinetic models. The P adsorptive capture was controlled by MgHPO4 formation and electrostatic attraction, which was affected by the coexisting F− and CO32− ions. MFBC could recover more than 98% of P from the solution and bio-liquid wastewater. Although the P-adsorbed MFBC showed very limited reusability but it can be substituted for phosphate fertiliser in agricultural practices. This study provided an innovative technology for preparing MgO-biochar composite against P recovery from aqueous media, and also highlighted high-value-added approaches for resource utilization of bio-liquid wastewater and food waste. Graphical Abstract

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Section: Biochar Characterizationmentioning

confidence: 99%

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Fang

Ali

Gao

et al. 2022

Biochar

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“…which favors DIP sorption by the modified biochars (Xu et al, 2019). By contrast, the pretreatment method is to incorporate the metal cations or metal-enriched materials into the biomass prior to pyrolysis (Fang et al, 2022;Li et al, 2018;Xu et al, 2019;Yang et al, 2021). This treatment can not only alter the surface properties of the produced biochar but may also change the metal properties and speciation (Fang et al, 2022;Li et al, 2022).…”

Section: Core Ideasmentioning

confidence: 99%

“…This treatment can not only alter the surface properties of the produced biochar but may also change the metal properties and speciation (Fang et al, 2022;Li et al, 2022). For example, Yang et al (2021) revealed that biomass pretreated with Ca-enriched lime sludge increased the pH of the biochar surface, resulting in more favorable precipitation reactions between Ca and Mg ions with phosphate ions (PO 4 3+ ; Yang et al, 2021), which significantly enhanced the removal of DIP for Ca-based PSMs. In addition, the pyrolysis of MgCl 2 -pretreated biomass can convert MgCl 2 to nanoscale Mg(OH) 2 and MgO particles dispersing on the biochar surfaces, which serves as the main sorption sites for P anions (Yao, Gao, Chen, Zhang et al, 2013;Zhu et al, 2020).…”

Section: Core Ideasmentioning

confidence: 99%

Enhancing dissolved inorganic phosphorous capture by gypsum‐incorporated biochar: Synergic performance and mechanisms

et al. 2023

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Excess nutrients such as phosphorus (P) in watersheds jeopardize water quality and trigger harmful algal blooms. Using phosphorus sorption material (PSM) to capture P from wastewater and agricultural runoff can help recover nutrients and prevent their water pollution. In this study, a novel designer biochar was generated by pyrolyzing woody biomass pretreated with a flue gas desulfurization gypsum. The removal of dissolved inorganic phosphorus (DIP) by the gypsum‐incorporated designer biochar was more efficient than the gypsum, suggesting the pretreatment of biomass with the gypsum results in a synergic effect on enhancing DIP capture. The maximum P adsorption capacity of the designer biochar was more than 200 mg g−1, which is one order of magnitude greater than that of the gypsum. This result clearly showed that the designer biochar is a better PSM to capture DIP from nutrient‐contaminated water compared to the gypsum. Post‐sorption characterization indicated that the sorption of DIP by the gypsum‐incorporated biochar involves multiple mechanisms. The precipitation reactions of Ca cations and P anions to form CaHPO4 and Ca3(PO4)2 precipitates on the highly alkaline surface of the designer biochar were identified as a main mechanism. By contrast, CaHPO4·2H2O is the only precipitated product for DIP sorption by the gypsum. In addition, the initial solution pH and the coexisting bicarbonate had less effects on the DIP removal by the designer biochar in comparison with the gypsum, which further confirms the former is an excellent PSM to capture DIP from a variety of aquatic media.This article is protected by copyright. All rights reserved

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“…In contrast, physical methods such as the commonly used adsorption technique are much 2 of 16 more economical and highly selective for removing phosphate from water, with less potential for secondary pollution. The adsorbents include zeolite [9], hydrotalcite [10], Al 2 O 3 [11], biochar [12] and so on. Among them, biochar is considered to be a potential adsorbent for water environmental governance due to its low cost and environmental friendliness [13].…”

Section: Introductionmentioning

confidence: 99%

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Guo

et al. 2022

IJERPH

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Adsorption is an efficient technology for removing phosphorus from wastewater to control eutrophication. In this work, MgO-modified biochars were synthesized by a solvent-free ball milling method and used to remove phosphorus. The MgO-modified biochars had specific surface areas 20.50–212.65 m2 g−1 and pore volume 0.024–0.567 cm3 g−1. The as-prepared 2MgO/BC-450-0.5 had phosphorus adsorption capacities of 171.54 mg g−1 at 25 °C and could remove 100% of phosphorus from livestock wastewater containing 39.51 mg L−1 phosphorus. The kinetic and isotherms studied show that the pseudo-second-order model (R2 = 0.999) and Langmuir models (R2 = 0.974) could describe the adoption process well.. The thermodynamic analysis indicated that the adsorption of phosphorus on the MgO-modified biochars adsorbent was spontaneous and endothermic. The effect of pH, FTIR spectra and XPS spectra studies indicated that the phosphorus adsorption includes a protonation process, electrostatic attraction and precipitation process. This study provides a new strategy for biochar modification via a facile mechanochemical method.

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Capture and recover dissolved phosphorous from aqueous solutions by a designer biochar: Mechanism and performance insights

Cited by 15 publications

References 42 publications

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Enhancing dissolved inorganic phosphorous capture by gypsum‐incorporated biochar: Synergic performance and mechanisms

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

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