Insights into properties of activated carbons prepared from different raw precursors by pyrophosphoric acid activation

Gao, Yuan; Yue, Qinyan

doi:10.1016/j.jes.2015.05.016

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…Thermal and acid treatment increase sorbent porosity and subsequently its sorption capacity [4,5]. Commonly used activating agents are KOH, NaOH, H 3 PO 4 ,H 2 SO 4, ZnCl 2 , among others [19]. Highly porous-activated carbons have been prepared from various crop residues using different activating agents.…”

Section: Carbon Content and Versatilitymentioning

confidence: 99%

Biomass Valorization: Agricultural Waste in Environmental Protection, Phytomedicine and Biofuel Production

Abosede¹,

Peter²,

Adunola³

2017

Biomass Volume Estimation and Valorization for Energy

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Industrialization is a major promoter of any nation's economy; it is not without detrimental effects on our immediate environment. Human exposure to various pollutants discharged into the environment may lead to serious health challenges. In the same vein, discharge from the combustion of fossil fuel contributes a great deal to the environmental pollution. The resulting quest for a clean and sustainable environment has spurred myriads of research into advantageous utilization of waste biomass in industrial wastewater treatment and environmentally friendly/alternative energy. Similarly, diverse waste materials have been adopted as sources of important phytochemicals with different medicinal applications. This chapter focuses on the application of waste biomass in environmental remediation, curative medicine, and clean/alternative energy.

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Section: Carbon Content and Versatilitymentioning

confidence: 99%

Biomass Valorization: Agricultural Waste in Environmental Protection, Phytomedicine and Biofuel Production

Abosede¹,

Peter²,

Adunola³

2017

Biomass Volume Estimation and Valorization for Energy

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show abstract

“…Thus, the advantage of halophyte biochar can be reasonably adopted to produce tremendous environmental and economic bene ts. The type of biomass, activating agents, and modi cation methods have a signi cant in uence on biochar properties [17]. Phosphoric acid (H 3 PO 4 ) and pyrophosphoric acid (H 4 P 2 O 7 ) are common activators.…”

Section: Introductionmentioning

confidence: 99%

Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soils

Wang

Sun

et al. 2022

Preprint

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Conditioning alkaline soil with acidic phosphorus-rich biochar might contribute to achieving sustainable phosphorus (P) use and residue management. In this study, acidic phosphorus-rich biochar was prepared from halophyte species biochar (HBC) by the modification of H3PO4 (P-HBC) and H4P2O7 (PA-HBC). The P combination method and fractions in biochars were characterized, and the effects of biochars on P fractions in different types of alkaline soil were examined with incubation experiments. The results showed that the pH values of P-HBC (3.31) and PA-HBC (2.17) decreased significantly, and the total P content increased to 4.66 g·kg− 1 and 5.24 g·kg− 1, respectively. The spectral analysis confirmed the doping of P and acid groups in biochar. The addition of modified biochars in alkaline soils will makes the soil tend to be neutral. Sequential extraction of soil P confirmed that biochars application facilitated the transformation of stable P into active fractions, with greater effects from modified biochars than HBC. Activation mechanism of biochar to soil P fractions varies from soil types. Overall, acidic phosphorus-rich biochars can be employed to improve alkaline soil properties and increase P activity.

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“…Halophytes are valuable biomass resources rich in cellulose and lignin, which can be utilized for biochar preparation [13,15,16]. The type of biomass, activating agents, and modification methods have a significant influence on biochar properties [17]. Phosphoric acid (H 3 PO 4 ) and pyrophosphoric acid (H 4 P 2 O 7 ) are common activators.…”

Section: Introductionmentioning

confidence: 99%

Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soils

Wang

Sun

et al. 2022

Chem. Biol. Technol. Agric.

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Conditioning alkaline soil with acidic phosphorus-rich biochar might contribute to improving soil phosphorous (P) availability and waste utilization efficiency. In this study, acidic phosphorus-rich biochar was prepared using halophyte biochar (HBC) modified by H3PO4 (P-HBC) and H4P2O7 (PA-HBC). The P-containing groups and P fractions in the HBCs were characterized, and the effects of biochar on the P fractions in alkaline soil were examined with incubation experiments. The results showed that the pH of P-HBC (3.31) and PA-HBC (2.17) was significantly reduced compared with HBC, and the total P contents rose to 4.66 g·kg− 1 and 5.24 g·kg− 1, respectively. The spectral characterization confirmed the loading of P-containing and acidic functional groups in the HBCs after modification. The application of P-HBC and PA-HBC in alkaline soils decreased the soil pH and facilitated the transformation of stable P into active fractions. Overall, acidic phosphorus-rich biochar can be employed to increase P activity in alkaline soil. Graphical Abstract

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Insights into properties of activated carbons prepared from different raw precursors by pyrophosphoric acid activation

Cited by 13 publications

References 40 publications

Biomass Valorization: Agricultural Waste in Environmental Protection, Phytomedicine and Biofuel Production

Biomass Valorization: Agricultural Waste in Environmental Protection, Phytomedicine and Biofuel Production

Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soils

Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soils

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