Adsorption of phosphorus by calcium-flour biochar: Isotherm, kinetic and transformation studies

Wang, Shengdan; Kong, Lingjun; Long, Jianyou; Su, Minhua; Diao, Zeng-Hui; Chang, Xiangyang; Chen, Diyun; Song, Gang; Shih, Kaimin

doi:10.1016/j.chemosphere.2017.12.101

Cited by 189 publications

(66 citation statements)

References 37 publications

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“…As shown in Table S4, the pseudo-second order kinetic model was the best fitted one with highest R 2 (0.974), lowest sum of squared error (SSE, 0.307) and lowest χ 2 (0.377). It suggested that chemisorptive interactions would be more dominant than physisorption [44,47]. Besides, the O-H peak in the Ca-BC was S5.…”

Section: Isotherms and Kinetics Analysis For Adsorption Ofmentioning

confidence: 99%

“…The calcium hydroxide, Ca(OH) 2 , on the biochar would rapidly react with phosphate in water to make Ca-phosphate complexation (Ca 10 (PO 4 ) 6 (OH) 2 or CaHPO 4, please see Eq. ( 5) and ( 6)) [42][43][44]. However, the raw BC led to the low adsorption of phosphate owing to lack of functional groups associated with adsorption of phosphate.…”

Section: Adsorption Of Phosphate On Raw Bc and Ca-bcmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of phosphate in water on a novel calcium hydroxide-coated dairy manure-derived biochar

Choi¹,

Jang²,

Kan³

et al. 2018

Environmental Engineering Research

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The present study investigated a novel calcium hydroxide-coated dairy manure-derived biochar (Ca-BC) for adsorption of phosphate from water and dairy wastewater. The Ca-BC showed much higher adsorption of phosphate than that of dairy manure-derived biochar. The Ca-BC possessed mainly the calcium hydroxide and various functional groups resulting in high reactivity between phosphate and calcium hydroxide in the Ca-BC. The adsorption of phosphate onto Ca-BC followed pseudo-second order kinetic and Freundlich isotherm models indicating chemisorptive interaction occurred on energetically heterogeneous surface of Ca-BC. The maximum adsorption capacity of the Ca-BC was higher than those of iron oxide and zinc oxide-coated biochars, but lower than those of CaO-and MgO-coated biochars. However, the Ca-BC showed high reactivity per surface area for adsorption of phosphate indicating importance of surface functionalization of biochar. On the other hand, the adsorption of phosphate in dairy wastewater on Ca-BC was lower than that in water owing to competition between other anions in wastewater and phosphate. Overall, the Ca-BC would be a low cost and effective adsorbent for recovery of phosphate from water and wastewater.

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Section: Isotherms and Kinetics Analysis For Adsorption Ofmentioning

confidence: 99%

Section: Adsorption Of Phosphate On Raw Bc and Ca-bcmentioning

confidence: 99%

Adsorption of phosphate in water on a novel calcium hydroxide-coated dairy manure-derived biochar

Choi¹,

Jang²,

Kan³

et al. 2018

Environmental Engineering Research

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“…The FeCl 3 ‐impregnated biochar exhibited the best phosphate adsorption capacity of 111 mg g −1 , achieving >60% phosphate removal efficiency after five recycles. Phosphate may also adsorb through a direct surface reaction [ 101 ] ; biochars prepared by pyrolyzing physical mixtures of calcium hydroxide and flour in a 2:1 mass ratios exhibited an exceptional adsorption capacity of 314.2 mg g −1 , attributed to the formation of crystalline hydroxyapatite (Ca 5 (PO 4 ) 3 (OH)). However, it is unlikely that such sorbents can be regenerated.…”

Section: Adsorption Applications Of Bio/hydrocharsmentioning

confidence: 99%

Bio/hydrochar Sorbents for Environmental Remediation

Zhang

Wang

Cai

et al. 2020

Energy & Environ Materials

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An increasing global population and current societal reliance on fossil fuel resources has precipitated an ongoing crisis at the energy-materials-environment nexus. Sustainable resources are required to meet the demands of developed and emerging economies while mitigating climate change and protecting the biosphere; this has promoted the "zero-waste economy" and "trash-to-treasure strategy" concepts. [1] Achieving such ambitious goals necessitates a transition from fossil resources to renewables such as nuclear, solar, wind, and wave power, and biomass. Lignocellulosic biomass, such as agricultural and forestry residues, crops, and wood, is the most abundant (inedible to humans) biomass resource and a potential low-carbon feedstock to partially replace fossil carbon. It comprises cellulose and hemicellulose carbohydrate polymers embedded in a lignin matrix. [2] Lignin is a three-dimensional network of polyaromatic alcohols, whose upgrading can offer routes to renewable valueadded chemicals. [3] Hemicellulose comprises pentose (predominantly xylose) and hexose units connected by glycosidic bonds. Cellulose is a water insoluble, linear polysaccharide formed from glucose units linked via b-1,4-glycosidic bonds. [4] As an important renewable feedstock, biomass, and its conversion to materials, chemicals, and fuels is intensively researched. [5] Biomass conversion may occur through non-catalytic (thermo)chemical routes, e.g., pyrolysis and hydrothermal processing, and/or catalytic (bio)chemical routes, e.g., homogeneous, heterogeneous, and enzymatic catalyzed processes [3,6] (Figure 1). Bio/hydrochars are an important class of solid materials obtainable from biomass due to their applications as adsorbents and catalysts, and as precursors to activated carbons and other functional materials. [7] Bio/hydrochars and activated carbons are all pyrogenic materials, i.e., produced by thermochemical conversion and containing some organic carbon. Activated carbons may derive from any carbon source (fossil, waste, or renewable) and irrespective of sustainability concerns, whereas biochars are (now) viewed as pyrogenic materials derived from sustainably sourced biomass and not used as a fuel. [8] Activated carbons are amorphous and non-graphitic, with high surface areas and (usually) microporosity and a small proportion of hydrogen or oxygen, whereas biochars, and particularly hydrochars, often possess a higher oxygen content. A few studies refer to biochars as pyrochars (being derived by pyrolysis of biomass) and/or conflate the terms pyrochar and hydrochar under the banner of biochars. [9] In this review, we follow widely adopted literature conventions for char definitions [7c,10] : biochar is a carbon-rich, porous solid produced by biomass pyrolysis under restricted oxygen and moderate temperatures (350-700°C), whereas

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“…The pseudo-first-order model is widely used to describe reversible physical adsorption between the adsorbent and the adsorbate [26]. The pseudo-second-order model indicated that the adsorption of P onto calcium-flour biochar was a chemisorptions-dominated process [27]. Therefore, in this study, the pseudo-second-order model could be used to predict the kinetic process for P and NO 3 − sorption on PCB and SDB, which was a chemisorptions-dominated process.…”

Section: Sample Pseudo-first-ordermentioning

confidence: 99%

Phosphorus and Nitrogen Adsorption Capacities of Biochars Derived from Feedstocks at Different Pyrolysis Temperatures

Zhou

et al. 2019

Water

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This study investigates the P and NO3− adsorption capacities of different biochars made from plant waste including rice straw (RSB), Phragmites communis (PCB), sawdust (SDB), and egg shell (ESB) exposed to a range of pyrolysis temperatures (300, 500 and 700 °C). Results indicate that the effect of pyrolysis temperature on the physiochemical properties of biochar varied with feedstock material. Biochars derived from plant waste had limited adsorption or even released P and NO3−, but adsorption of P capacity could be improved by adjusting pyrolysis temperature. The maximum adsorption of P on RSB700, PCB300, and SDB300, produced at pyrolysis temperature of 700, 300 and 300 °C, was 5.41, 7.75 and 3.86 mg g−1, respectively. ESB can absorb both P and NO3−, and its adsorption capacity increased with an increase in pyrolysis temperature. The maximum NO3− and P adsorption for ESB700 was 1.43 and 6.08 mg g−1, respectively. The less negative charge and higher surface area of ESB enabled higher NO3− and P adsorption capacity. The P adsorption process on RSB, PCB, SDB and ESB, and the NO3− adsorption process on ESB were endothermic reactions. However, the NO3− adsorption process on RSB, PCB and SDB was exothermic. The study demonstrates that the use of egg shell biochar may be an effective way to remove, through adsorption, P and NO3− from wastewater.

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Adsorption of phosphorus by calcium-flour biochar: Isotherm, kinetic and transformation studies

Cited by 189 publications

References 37 publications

Adsorption of phosphate in water on a novel calcium hydroxide-coated dairy manure-derived biochar

Adsorption of phosphate in water on a novel calcium hydroxide-coated dairy manure-derived biochar

Bio/hydrochar Sorbents for Environmental Remediation

Phosphorus and Nitrogen Adsorption Capacities of Biochars Derived from Feedstocks at Different Pyrolysis Temperatures

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