Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

Wei, Wei; Yang, Lei; Zhong, Wenhui; Cui, Jing; Wei, Zhenggui

doi:10.1016/j.apsusc.2015.01.209

Cited by 24 publications

(8 citation statements)

References 76 publications

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“…where q (t) (mg g −1 ) is the mass of P (mg) removed per gram of CAAC at certain time (adapted from [22]), mP (i) and mP ( f ) are the initial and final mass of P (mg) in the aqueous solution, respectively, and M is the mass of adsorbent (CAAC). Both, mP (i) and mP ( f ) were calculated using mP (t) ;…”

Section: Phosphorus Removal Indicatorsmentioning

confidence: 99%

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Castellar

Formosa

Chimenos

et al. 2019

Water

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Phosphorus (P) is a limited resource and can promote eutrophication of water streams and acidification of oceans when discharged. Crushed autoclaved aerated concrete (CAAC), a by-product from demolition, has shown great potential for recovering P. The potential of CAAC to be used in nature-based solutions as a P-reactive filter medium was evaluated by performing preliminary batch essays. Here, we evaluated the interactions and main effects of the initial concentration of P (Pi; 5, 10 or 20 mg L−1), particle size (PS; 4 or 5 mm) and contact time (CT; 60, 180, 360, 720 and 1440 min) upon the removal. We performed physical and chemical characterization to understand the removal processes. Data collected were fitted in adsorption kinetic models. The statistical analysis showed a significant interaction between CT and Pi, with the combination of its main effects stronger on P removal than each one separately. Intriguingly, we noticed that the higher the concentration of Pi, the faster and higher the removal of P. Contrary to expectations, PS 5 mm showed higher removal rates than PS 4 mm, indicating that besides adsorption, other unidentified chemical processes are in place. Further studies using columns/pilots with real wastewater are recommended for a future follow-up.

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Section: Phosphorus Removal Indicatorsmentioning

confidence: 99%

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Castellar

Formosa

Chimenos

et al. 2019

Water

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“…The decrease of the adsorption ability was due to the increase of the particle size and crystallinity of adsorbent after calcining at high temperatures. In the previous work [33], we had revealed the crystallinity-dependent removal of fulvic acid from aqueous solution, that the poorly crystalline HAP derived from lower calcining temperature exhibited higher adsorption capacity for fulvic acid than those from higher calcining temperature. In this view, the poorly crystalline and well dispersed HAP-100 possessed higher adsorption capacity than HAP-400 and HAP-800.…”

Section: Effect Of Crystallinity On Cu(ii) Adsorptionmentioning

confidence: 98%

Enhanced Removal of Cu(II) Ions from Aqueous Solution by Poorly Crystalline Hydroxyapatite Nanoparticles

Yang

Zhong

Cui

et al. 2015

Journal of Dispersion Science and Technology

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Poorly crystalline and well dispersed hydroxyapatite (HAP) nanoparticles were synthesized and used as novel adsorbents for the removal of Cu(II) from aqueous solution.Various factors affecting the adsorption such as adsorbent crystallinity, pH, adsorbent dosage, contact time, temperature, competing cations and the presence of humic acid were investigated in detail. Results showed that the HAP calcined at lower temperature was poorly crystalline and had better adsorption capacity for Cu(II) than those calcined at higher temperature. Cu(II) removal was increased with increases of pH, adsorbent dosage, temperature, and the presence of humic acid, but decreased as the existence of competing divalent cations. Kinetic studies showed that pseudo-second-order kinetic model better described the adsorption process. Equilibrium data were best described by Langmuir model, and the estimated maximum adsorption capacity of poorly crystalline HAP was 41.80 mg/g at 313 K, displaying higher efficiency for Cu(II) removal than many previously reported adsorbents. Thermodynamics studied revealed that the adsorption of Downloaded by [RMIT University] at 13:42 12 August 2015 2Cu(II) by poorly crystalline HAP was spontaneous, endothermic and entropy-increasing in nature. This study showed that poorly crystalline HAP could be used as an efficient adsorbent material for the removal of Cu(II) from aqueous solution.

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“…pH value is a key factor in the adsorption process, which affects not only the properties of the material but also the chemical species and properties of the target pollutants [56,57]. The effect of pH value on the adsorption of HA, FA, and TA by PS MPs was researched in the range of pH 2-10.…”

Section: Effect Of Ph On Ha Fa and Ta Adsorption By Ps Mpsmentioning

confidence: 99%

“…When the pH was higher than pH PZC , the amount of negative charge on the surface of PS MPs increased as the pH value increased. Moreover, the zeta potentials of HA and FA were reported to be negative in the range of experimental pH values [57,61]. This suggests that electrostatic interactions play a significant role in the adsorption of HA and FA by PS MPs, and as the pH increases, both negatively charged species develop electrostatic repulsion.…”

Section: Effect Of Ph On Ha Fa and Ta Adsorption By Ps Mpsmentioning

confidence: 99%

Adsorption of Tannic Acid and Macromolecular Humic/Fulvic Acid onto Polystyrene Microplastics: A Comparison Study

et al. 2022

Water

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Dissolved organic matter (DOM) has been widely reported to influence the environmental behavior of microplastics (MPs), but little is known about the properties and mechanisms of interaction between specific DOM components and MPs. Here, we studied the adsorption of three representative DOM components (humic acid, HA; fulvic acid, FA; and tannic acid, TA) on polystyrene (PS) MPs in batch adsorption experiments. Results revealed that HA/FA adsorption was greater under acidic conditions, while higher TA adsorption on PS was found at pH 4 and 6. The divalent cation (Ca2+) exerted a more prominent role in enhancing HA, FA, and TA adsorption on PS than did monovalent ones (K+ and Na+). The adsorption process fitted well with the Freundlich isotherm model and the pseudo-second-order kinetics model. The adsorption site heterogeneity was evaluated using the site energy distribution analysis based on the Freundlich model. The greater binding ability of HA on the PS surface caused a more negatively charged surface than FA/TA, as reflected by Zeta potential values. The findings of this study not only provide valuable information about the adsorption behavior and interaction processes of various DOM components on PS MPs, but also aid our efforts to evaluate the environmental behaviors of MPs.

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Poorly crystalline hydroxyapatite: A novel adsorbent for enhanced fulvic acid removal from aqueous solution

Cited by 24 publications

References 76 publications

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Crushed Autoclaved Aerated Concrete (CAAC), a Potential Reactive Filter Medium for Enhancing Phosphorus Removal in Nature-Based Solutions—Preliminary Batch Studies

Enhanced Removal of Cu(II) Ions from Aqueous Solution by Poorly Crystalline Hydroxyapatite Nanoparticles

Adsorption of Tannic Acid and Macromolecular Humic/Fulvic Acid onto Polystyrene Microplastics: A Comparison Study

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