Recovery of phosphate with chemically modified biochars

Takaya, Chibi; Fletcher, Louise; Singh, Surjit; Okwuosa, U.C.; Ross, Andrew B.

doi:10.1016/j.jece.2016.01.011

Cited by 98 publications

(44 citation statements)

References 42 publications

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“…The developed meso-and micropores in the porous structure, due to modification by MgSO 4 impregnation of SCBF, enhanced the efficiency of Mg-SCBB to remove ammonium from solution compared with SCBB and it performed comparably to Zeolite and Charcoal. Similar results were obtained Yao et al (2013), Fang et al (2014) and Takaya et al (2016) who found that pretreatments of biomasses with metal solutions enhanced the efficiency of the generated biochars in removing inorganic ions (NH 4 + , NO 3 -, PO 4 -P) from aqueous solutions.…”

Section: Adsorption Kinetics Of Ammonium and Phosphate Ionssupporting

confidence: 86%

Mg-Modified Sugarcane Bagasse Biochar for Dual Removal of Ammonium and Phosphate Ions from Aqueous Solutions

Saleh

Hedia

2018

Alexandria Science Exchange Journal

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Utilization of agricultural wastes to generate cheap and efficient sorbents to remove contaminants from wastewaters is an up-to-date environmental challenge. In Egypt, sugarcane bagasse is yearly generated as a waste material in huge amounts. The objectives of this study were to investigate the effect of chemical modification on the properties of bagasse biochar generated from local sugarcane bagasse feedstock (SCBF) and assess its efficiency for removal of both ammonium and phosphate ions from artificial aqueous solutions. SCBB and Mg-SCBB biochars were produced through pyrolysis of raw SCBF and MgSO 4 impregnated SCBF, respectively at 500 C and under oxygen-limited condition. FTIR peaks analysis, DEM examination, and some physical and chemical properties revealed that new surface functional groups, meso-and micropores, larger surface area and higher CEC were developed in SCBB and Mg-SCBB compared to SCBF. SCBB and Mg-SCBB showed high affinity to ammonium adsorption from aqueous solutions comparable to Charcoal and Zeolite. Mg-SCBB was the only sorbent capable of removing phosphate from the aqueous. Ammonium and phosphate removal at 1:200 sorbent to solution ratio were higher than those at 1:500 for all sorbents. A slight ammonium volatilization occurred during the adsorption process due to high solution pH. Adsorption kinetics data were best fitted to the pseudo-second-order kinetic equation suggesting intraparticle diffusion controlled adsorption process. Ammonium adsorption isotherms were best fitted to Freundlich model. The calculated Freundlich intensity parameter (n) ranged from 0.478 to 0.894 indicating favorable adsorption of ammonium and phosphate by all sorbents. Mg-SCBB had an adsorption capacity of 2573.9 and 4002.2 mg kg-1 for ammonium and phosphate, respectively. The produced Mg-modified sugarcane bagasse biochar may represent a promising efficient and cheap sorbent for dual remediation of wastewaters contaminated with ammonium and phosphate ions.

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Section: Adsorption Kinetics Of Ammonium and Phosphate Ionssupporting

confidence: 86%

Mg-Modified Sugarcane Bagasse Biochar for Dual Removal of Ammonium and Phosphate Ions from Aqueous Solutions

Saleh

Hedia

2018

Alexandria Science Exchange Journal

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“…6), post coating. Results were similar to what has been reported by Takaya et al (2016) with 65 mg P g −1 and Xu et al (2017) with 66-120 mg P g −1 for biochars similarly coated with magnesium salts, but significantly lower than what was reported by Zhang et al (2012) with 272 mg P g −1 . The high P adsorption in the latter case was likely due to the formation of nanosized MgO flakes, increasing the potential surface area to bind phosphate.…”

Section: Laboratory Biochar Evaluationsupporting

confidence: 88%

Impact of biochar coated with magnesium (hydr)oxide on phosphorus leaching from organic and mineral soils

et al. 2018

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Purpose Recent research suggests that Swedish organic arable soils have been under-recognized as a potential source of phosphorus (P) loading to water bodies. The aim of this study was to compare P losses through leaching from organic and highfertility mineral soils. In addition, the effectiveness of a magnesium-salt-coated biochar applied below the topsoil as a mitigation strategy for reducing P losses was evaluated. Materials and methods Phosphorus leaching was measured from four medium-to high-P arable soils, two Typic Haplosaprists (organic 1 and 2), a Typic Hapludalf (sand), and an unclassified loam textured soil (loam), in a 17-month field study utilizing 90cm-long lysimeters. A magnesium-salt-coated biochar was produced and characterized using X-ray powder diffraction (XPD), scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS), and X-ray adsorption (XANES) spectroscopy, and its phosphate adsorption capacity was determined at laboratory scale. It was also applied as a 3-cm layer, 27 cm below the soil surface of the same lysimeters and examined as a mitigation measure to reduce P leaching. Results and discussion Total-P loads from the 17-month, unamended lysimeters were in the order of organic 2 (1.2 kg ha −1) > organic 1 (1.0 kg ha −1) > sand (0.3 kg ha −1) > loam (0.2 kg ha −1). Macropore flow, humic matter competition for sorption sites, and fewer sorption sites likely caused higher P losses from the organic soils. Analysis by XRD and SEM revealed magnesium was primarily deposited as periclase (MgO) on the biochar surface but hydrated to brucite (Mg(OH) 2) in water. The Langmuir maximum adsorption capacity (Q max) of the coated biochar was 65.4 mg P g −1. Lysimeters produced mixed results, with a 74% (P < 0.05), 51% (NS), and 30% (NS) reduction in phosphate-P from the organic 1, organic 2, and sand, respectively, while P leaching increased by 230% (NS) from the loam. Conclusions The findings of this study indicate that P leached from organic arable soils can be greater than from mineral soils, and therefore, these organic soils require further investigation into reducing their P losses. Metal-enriched biochar, applied as an adsorptive layer below the topsoil, has the potential to reduce P losses from medium-to high-P organic soils but appear to be less useful in mineral soils.

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“…Chemical activation treatments are more frequently employed, possibly because such treatments offer greater improvements in biochar surface area and porosity development due to the higher activation temperatures (Takaya et al, 2016). Chemically modified biochar has potential for sorption and detoxification of some heavy metals (Zhou et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of acid modification of biochar on nutrient availability and maize growth in a calcareous soil

Şahin

Taşkın

Kaya

et al. 2017

Soil Use and Management

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The nutritional quality of acid‐modified poultry manure biochar is unclear, so a better understanding of its properties and agronomic potential is needed. The biochar was modified with phosphoric acid (H3PO4) and nitric acid (HNO3) and a combination of the two, before and after pyrolysis. After characterization of biochar samples and determination of total and water‐soluble mineral element concentrations, biochars were applied to a calcareous soil at a rate of 0.5% (w/w) to find out their effects on the mineral nutrition and growth of maize. Treatment with H3PO4+ HNO3 enriches the biochar with phosphate, nitro groups and nitrate. The experimental results suggested that biochar modified with HNO3 and/or HNO3+H3PO4 after pyrolysis increased the water‐soluble phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), zinc (Zn), copper (Cu) and manganese (Mn) concentrations and increased plant‐available nutrients and plant growth by positively affecting the absorption of plant nutrients. The highest plant dry weight was obtained from biochar post‐treated with HNO3+H3PO4, and this was followed by HNO3‐ and H3PO4‐modified biochars. Premodification with HNO3+H3PO4 also significantly increased plant dry weights. The results of this study revealed that poultry manure biochar modified with HNO3 and H3PO4 can be used effectively in calcareous soil for the improvement of plant mineral nutrition.

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Recovery of phosphate with chemically modified biochars

Cited by 98 publications

References 42 publications

Mg-Modified Sugarcane Bagasse Biochar for Dual Removal of Ammonium and Phosphate Ions from Aqueous Solutions

Mg-Modified Sugarcane Bagasse Biochar for Dual Removal of Ammonium and Phosphate Ions from Aqueous Solutions

Impact of biochar coated with magnesium (hydr)oxide on phosphorus leaching from organic and mineral soils

Effect of acid modification of biochar on nutrient availability and maize growth in a calcareous soil

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