Preferable phosphate sequestration by nano-La(III) (hydr)oxides modified wheat straw with excellent properties in regeneration

Qiu, Hui; Chen, Liang; Yu, Jianguo; Zhang, Qingrui; Song, Mo; Chen, Fenghua

doi:10.1016/j.cej.2017.01.043

Cited by 267 publications

(58 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Currently, a series of different adsorbents has been investigated for phosphate removal from synthesized aqueous water with or without surface modification. Some of these include zirconium oxide nanoparticles [ 19 ], exfoliated vermiculites [ 20 ], lanthanum hydroxide materials [ 21 ], bio-chars derived from crop straws [ 22 ], rice husk ash [ 23 ]; building waste [ 24 ], treated natural clinoptilolite [ 25 ], modified wheat straw [ 26 ], quaternary ammonium Chinese reed [ 27 ], zirconia-coated magnetite nanoparticles [ 28 ], corn stalks [ 29 ], iron oxide waste [ 30 ], and magnetic coal [ 31 ]. However, many of these suffer from either poor regenerablity or high process costs or low adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

2021

View full text Add to dashboard Cite

The contamination of surface and groundwater with phosphate originating from industrial and household wastewater remains a serious environmental issue in low-income countries. Herein, phosphate removal from aqueous solutions was studied using low-cost volcanic rocks such as pumice (VPum) and scoria (VSco), obtained from the Ethiopian Great Rift Valley. Batch adsorption experiments were conducted using phosphate solutions with concentrations of 0.5 to 25 mg·L−1 to examine the adsorption kinetic as well as equilibrium conditions. The experimental adsorption data were tested by employing various equilibrium adsorption models, and the Freundlich and Dubinin-Radushkevich (D-R) isotherms best depicted the observations. The maximum phosphate adsorption capacities of VPum and VSco were calculated and found to be 294 mg·kg−1 and 169 mg·kg−1, respectively. A pseudo-second-order kinetic model best described the experimental data with a coefficient of correlation of R2 > 0.99 for both VPum and VSco; however, VPum showed a slightly better selectivity for phosphate removal than VSco. The presence of competitive anions markedly reduced the removal efficiency of phosphate from the aqueous solution. The adsorptive removal of phosphate was affected by competitive anions in the order: HCO3− >F− > SO4−2 > NO3− > Cl− for VPum and HCO3− > F− > Cl− > SO4−2 > NO3− for VSco. The results indicate that the readily available volcanic rocks have a good adsorptive capacity for phosphate and shall be considered in future studies as test materials for phosphate removal from water in technical-scale experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

2021

View full text Add to dashboard Cite

show abstract

“…The concentrations of La release in solution at pH 3.0 were found to be 0.22, 1.56 and 18.98 mg/L for the Fe/La 3:1, Fe/La 1:1 and Fe/La 1:3 binary (hydr)oxides, respectively, indicating that the increase of La contents in Fe-La binary (hydr)oxides could promote the dissolution of La. The release of La in solution has also been observed by other La-based sorbents, such as nano-La(III) (hydr)oxides modi ed-wheat straw (Qiu et al 2017), La(OH) 3 /Fe 3 O 4 nanocomposite (Wu et al 2017) and magnetic porous biochar supported La(OH) 3 (Zhang et al 2021). Therefore, a rather low solubility product constant (K sp = 3.7 × 10 − 23 ) suggests that the insoluble lanthanum phosphate (LaPO 4 ) precipitation was formed under acidic conditions, which was further discussed as below.…”

Section: Effect Of Ph On Phosphate Removalmentioning

confidence: 84%

Phosphate removal from aqueous solution by Fe-La binary (hydr)oxides: A study of batch experiments and mechanisms

Haijing

Zhang

Wang

et al. 2021

Preprint

View full text Add to dashboard Cite

In this study, Fe-La binary (hydr)oxides were prepared by a co-precipitation method for phosphate removal. Various techniques, including secondary electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), powder X-ray diffraction (p-XRD) and Brunauer-Emmett-Teller (BET) surface area analysis, were employed to characterize the synthesized Fe-La binary (hydr)oxides. Batch experiments indicated that the performance of phosphate removal by Fe-La binary (hydr)oxides was excellent and increased with increasing La contents. The kinetics study showed that the adsorption was rapid and described better by the pseudo-second-order equation. The maximum adsorption capacities of Fe/La 3:1, Fe/La 1:1 and Fe/La 1:3 binary (hydr)oxides at pH 4.0 calculated by Langmuir model were 49.02, 69.44 and 136.99 mg/g, respectively. The uptake of phosphate was highly affected by solution pH and significantly reduced with the increase of pH value. The analyses of p-XRD, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) suggested that the predominant mechanisms of phosphate removal involved surface hydroxyl exchange reactions and co-precipitation of released La3+ and phosphate ions, which resulted into the formation of amorphous phase of rhabdophane (LaPO4∙0.5H2O). The results show great potential for the application on the treatment of phosphate decontamination for their high efficiency of phosphate removal.

show abstract

“…Second, the TC molecules on the surface of the adsorbent diffuse into the channel. Finally, the adsorption tends to reach equilibrium [29].…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Thermo-responsive functionalized PNIPAM@Ag/Ag3PO4/CN-heterostructure photocatalyst with switchable photocatalytic activity

Sun

Zhou

et al. 2020

Chinese Journal of Catalysis

View full text Add to dashboard Cite

Preferable phosphate sequestration by nano-La(III) (hydr)oxides modified wheat straw with excellent properties in regeneration

Cited by 267 publications

References 33 publications

Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Phosphate removal from aqueous solution by Fe-La binary (hydr)oxides: A study of batch experiments and mechanisms

Thermo-responsive functionalized PNIPAM@Ag/Ag3PO4/CN-heterostructure photocatalyst with switchable photocatalytic activity

Contact Info

Product

Resources

About