Enhancing phosphate adsorption by Mg/Al layered double hydroxide functionalized biochar with different Mg/Al ratios

Li, Ronghua; Wang, Jim J.; Zhou, Baoyue; Awasthi, Mukesh Kumar; Ali, Amjad; Zhang, Zengqiang; Gaston, Lewis A.; Lahori, Altaf Hussain; Mahar, Amanullah

doi:10.1016/j.scitotenv.2016.03.151

Cited by 512 publications

(129 citation statements)

References 44 publications

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“…shown, the phosphate removal between different Mg 2+ /Al 3+ ratios of Mg-Al LDHs/AC have a small difference. The results were in accordance with the previous studies [25]. It would be caused by a close interlayer space (Table 1.) and water contact angle (Fig.5.…”

Section: Introductionsupporting

confidence: 93%

“…Cland NO 3 show a relatively weak influence. Li et al [25] arrived at the same conclusion, that is, SO 4 Fig. 2c and 2d.…”

Section: Introductionmentioning

confidence: 59%

“…Their crystal structure is similar to that of hydrotalcite (with the molecular formula of Mg The effects of trivalent metal cations on the CDI process clearly require an in-depth discussion. Li et al [25] suggested that a large amount of Al 3+ would decrease the charge density of mixed metal hydroxide layers and subsequently improve phosphate removal. Das et al [26] found that the properties and contents of metal cations in LDHs impact the phosphate adsorption capacity and that the maximum phosphate removal occurs at a pH of 5.…”

Section: Introductionmentioning

confidence: 99%

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Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes

Zhou

Hong

et al. 2019

Separation and Purification Technology

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The efficient uptake of phosphate from aqueous solutions was achieved on layered double hydroxides (LDHs)-based electrodes via capacitive desalination in our previous study. The current follow-up work was mainly carried out to study the influence of various experimental parameters on the capacitive removal of phosphate using LDHs/activated carbon (LDHs/AC) composite electrodes. A series of batch experiments were implemented to investigate the experimental factors, including Mg 2+ /Al 3+ ratios (2, 3, and 4), trivalent metal cations (Al 3+ , Fe 3+ , Cr 3+), initial solution pH (from 3 to 10), coexisting anions (NO 3-, Cl-, SO 4 2-), and ion strengths, in capacitive deionization. The electrode materials before and after capacitive deionization were characterized to reinforce the analysis of the adsorption mechanisms by X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray, cyclic voltammetry, and electrochemical impedance spectroscopy. Results indicated that the Mg-Al LDHs/AC electrodes exhibited higher phosphate adsorption capacity (80.43 mg PO 4 3-/g), more regular morphology, and higher degree of crystallinity than that of Mg-Fe LDHs/AC and Mg-Cr LDHs/AC. Increasing Mg 2+ /Al 3+ ratios enhanced the adsorption capacity of phosphate. The uptake of phosphate by Mg-Al LDHs/AC under circumneutral pH and low ion strength reached the maximum level. Furthermore, the presence of coexisting anions lowered the adsorption capacity of phosphate mainly due to the occurrence of a compressed electrical double layer. Therefore, the influence of different experimental parameters on phosphate removal via capacitive deionization by Mg-Al LDHs/AC necessitates a 3 systematic investigation to optimize the preparation conditions of LDHs-based electrodes and several important operating parameters.

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Section: Introductionsupporting

confidence: 93%

“…Cland NO 3 show a relatively weak influence. Li et al [25] arrived at the same conclusion, that is, SO 4 Fig. 2c and 2d.…”

Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes

Zhou

Hong

et al. 2019

Separation and Purification Technology

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“…Water-soluble Pi typically accounts for 40% to 60% (average 50%) of the P t content in mature crop residues and from 60% to 80% (average 70%) of P t content in green crop residues (Damon et al, 2014). In environmental studies, water-soluble P is a good indicator of the short-term P loss potential in biosolids (e.g., manure and sewage sludge), which leads to eutrophication in aquatic ecosystem (Sharpley and Moyer, 2000;Li et al, 2016). Consequently, improper application of crop residue to an agricultural field will lead to P leaching.…”

Section: Chemical Sequential Fractionationmentioning

confidence: 99%

Pyrolysis temperature affects phosphorus transformation in biochar: Chemical fractionation and 31P NMR analysis

Zhang

Shao

et al. 2016

Science of The Total Environment

127

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Phosphorus (P) recycling or reuse by pyrolyzing crop residue has recently elicited increased research interest. However, the effects of feedstock and pyrolysis conditions on P species have not been fully understood. Such knowledge is important in identifying the agronomic and environmental uses of biochar. Residues of three main Chinese agricultural crops and the biochars (produced at 300°C-600°C) derived from these crops were used to determine P transformations during pyrolysis. Hedley sequential fractionation and 31 P NMR analyses were used in the investigation. Our results showed that P transformation in biochar was significantly affected by pyrolysis temperature regardless of feedstock (Wheat straw, maize straw and peanut husk). Pyrolysis treatment transformed water soluble P into a labile (NaHCO 3 -P i ) or semi-labile pool (NaOH-P i ) and into a stable pool (Dil. HCl P and residual-P). At the same time, organic P was transformed into inorganic P fractions which was identified by the rapid decomposition of organic P detected with solution 31 P NMR. The P transformation during pyrolysis process suggested more stable P was formed at a higher pyrolysis temperature. This result was also evidenced by the presence of less soluble or stable P species, such as such as poly-P, crandallite (CaAl 3 Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v P forms at higher pyrolysis temperature although their solubility or stability requires further investigation. Results suggested that a relatively lower pyrolysis temperature retains P availability regardless of feedstock during pyrolysis process.

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“…Adsorbent modification can bypass these difficulties and has become a conventional method for enhancing adsorption capacity. For instance, altering Mg(NO 3 ) 2 and Al(NO 3 ) 3 ratios in sugarcane biochar and lanthanum to modify bentonite clay has been successfully used to enhance adsorption (Dithmer et al, 2015; Li et al, 2016c). However, these modified absorbents still do not efficiently remove phosphate, especially at low phosphate concentrations (Chen et al, 2015).…”

mentioning

confidence: 99%

Using Recycled Concrete as an Adsorbent to Remove Phosphate from Polluted Water

Tang²,

Zhang

et al. 2019

J of Env Quality

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Phosphate pollution remains a significant hazard to terrestrial and aquatic ecosystems. We developed an economical and efficient method for phosphate adsorption on waste construction concrete modified with seawater. Compared with raw concrete materials, the phosphate adsorption capacity of seawater‐modified waste concrete was highly efficient, especially at low phosphate concentrations. The inflection point for seawater‐modified concrete was 0.66 and 1.22 mg L−1 for the raw material. The relative phosphate adsorption was 4.64 and 2.39 mg g−1, respectively. Phosphate removal was >90% over a pH range of 3 to 11 for the raw and modified materials. Chemical and physical analysis of the modified concrete indicated that Ca and Mg particles were uniformly sequestrated on the surface, and Ca was the determinant controlling phosphate uptake. Phosphate adsorption isotherms fit well using the Freundlich, Temkin, Elovich, Fowler–Guggenheim, and Hill–de Boer models and indicated that intermolecular forces in the concrete particles were enhanced by calcium oxides from seawater. This method can efficiently remove phosphate from polluted water and repurposes waste construction concrete. Core Ideas Phosphate adsorption capacity of modified waste concrete was highly efficient at low phosphate. Phosphate removal was >90% over a pH range of 3 to 11 for the raw and modified materials. Calcium was the determinant controlling phosphate uptake for seawater‐modified concrete. Intermolecular forces in the concrete particles were enhanced by calcium oxides from seawater.

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Enhancing phosphate adsorption by Mg/Al layered double hydroxide functionalized biochar with different Mg/Al ratios

Cited by 512 publications

References 44 publications

Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes

Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes

Pyrolysis temperature affects phosphorus transformation in biochar: Chemical fractionation and 31P NMR analysis

Using Recycled Concrete as an Adsorbent to Remove Phosphate from Polluted Water

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