scholarly journals Corrigendum to “Effects of Al substitution on local structure and morphology of lepidocrocite and its phosphate adsorption kinetics” [Geochim. Cosmochim. Acta 276 (2020) 109–121]

2021 ◽  
Author(s):  
Shuai Liao ◽  
Xiaoming Wang ◽  
Hui Yin ◽  
Jeffrey E. Post ◽  
Yupeng Yan ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Local Structure ◽  
Phosphate Adsorption ◽  
Structure And Morphology ◽  
Al Substitution

Effects of Al substitution on local structure and morphology of lepidocrocite and its phosphate adsorption kinetics

2020 ◽  
Vol 276 ◽  
pp. 109-121
Author(s):  
Shuai Liao ◽  
Xiaoming Wang ◽  
Hui Yin ◽  
Jeffrey E. Post ◽  
Yupeng Yan ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Local Structure ◽  
Phosphate Adsorption ◽  
Structure And Morphology ◽  
Al Substitution

scholarly journals Performance and adsorption mechanism of a magnetic calcium silicate hydrate composite for phosphate removal and recovery

2018 ◽  
Vol 2017 (2) ◽  
pp. 578-591 ◽  
Author(s):  
Lihong Peng ◽  
Hongliang Dai ◽  
Yifeng Wu ◽  
Zheqin Dai ◽  
Xiang Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetic Separation ◽  
Adsorption Kinetics ◽  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Phosphate Removal ◽  
Separation Technique ◽  
Phosphate Adsorption ◽  
X Ray ◽  
Removal And Recovery

Abstract A novel magnetic calcium silicate hydrate composite (Fe3O4@CSH) was proposed for phosphorus (P) removal and recovery from a synthetic phosphate solution, facilitated by a magnetic separation technique. The Fe3O4@CSH material was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), zeta-potential and magnetic curves. The chemical composition and structure of Fe3O4@CSH and the successful surface loading of hydroxyl functional groups were confirmed. Phosphate adsorption kinetics, isotherm, and thermodynamic experiments showed that adsorption reaches equilibrium at 24 h, with a maximum adsorption capacity of 55.84 mg P/g under optimized experimental conditions. Adsorption kinetics fitted well to the pseudo second-order model, and equilibrium data fit the Freundlich isotherm model. Thermodynamic analysis provided a positive value for ΔH° (129.84 KJ/mol) and confirmed that phosphate adsorption on these materials is endothermic. The P-laden Fe3O4@CSH materials could be rapidly separated from aqueous solution by a magnetic separation technique within 1 min. A removal rate of more than 60% was still obtained after eight adsorption/desorption cycles, demonstrating the excellent reusability of the particles. The results demonstrated that the Fe3O4@CSH materials had high P-adsorption efficiency and were reusable.

Adsorption of Methylene Blue and Congo Red on Bentonite Modified with CaCO3

2017 ◽  
Vol 727 ◽  
pp. 853-858 ◽  
Author(s):  
Han Bing Zhang ◽  
Ning Hua Chen ◽  
Zhang Fa Tong ◽  
Qi Feng Liu ◽  
Yan Kui Tang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Adsorption Isotherms ◽  
Adsorption Kinetics ◽  
Congo Red ◽  
Phosphate Adsorption ◽  
Adsorption Effect ◽  
Adsorption Performance ◽  
Initial Ph ◽  
Removal Efficiencies ◽  
Ph Range

Both bentonite and CaCO3 are cheap and abundant superior regional non-metal ores in Guangxi province, so it is very meaningful to jointly exploit bentonite and CaCO3 for real applications. In this study, bentonite modified with CaCO3 (CCB) was prepared and its adsorption performance of Congo Red (CR) and Methylene Blue (MB) was evaluated by investigating the adsorption influencing effects of initial pH, SDBS and phosphate. Adsorption isotherms and adsorption kinetics models were also fitted to analysis the corresponding kinetic characteristics of CCB. The results show that CCB exhibited superior adsorption performance with the respective > 90% MB and CR removal within the initial pH range 2 ~ 10. To a certain extent, MB removal efficiencies by CCB can be increased with the addition of SDBS. On the other hand, CR adsorption on CCB was inhibited slightly in presence of SDBS. But as a whole, removal efficiencies of MB and CR by CCB were kept constant when SDBS co-existed. MB and CR adsorption on CCB decreased to some extent because of competitive adsorption effect when phosphate co-existed. It also demonstrated that CCB can remove phosphate at the same time with dyes. Adsorption models including adsorption isotherms adsorption kinetics indicated that MB and CR adsorption on CCB was a monolayer process, and the adsorption rate depended on both adsorbent and adsorbate. In summary, CCB is a promising adsorbent for dyes removal with many advantages such as simple preparation technology, excellent adsorption performance for anionic and cationic dyes, broad fitting pH range and SDBS resistance. Besides, it can remove dyes together with phosphate at the same time. Therefore, this study is very useful for the dyeing wastewater treatment and exploiting the resources of bentonite and CaCO3.

scholarly journals Kinetic and Thermodynamic Studies on the Phosphate Adsorption Removal by Dolomite Mineral

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaoli Yuan ◽  
Wentang Xia ◽  
Juan An ◽  
Jianguo Yin ◽  
Xuejiao Zhou ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Removal Rate ◽  
Second Order ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Thermodynamic Studies ◽  
Pseudo Second Order ◽  
Second Order Model

The efficiency of dolomite to remove phosphate from aqueous solutions was investigated. The experimental results showed that the removal of phosphate by dolomite was rapid (the removal rate over 95% in 60 min) when the initial phosphate concentration is at the range of 10–50 mg/L. Several kinetic models including intraparticle diffusion model, pseudo-first-order model, Elovich model, and pseudo-second-order model were employed to evaluate the kinetics data of phosphate adsorption onto dolomite and pseudo-second-order model was recommended to describe the adsorption kinetics characteristics. Further analysis of the adsorption kinetics indicated that the phosphate removal process was mainly controlled by chemical bonding or chemisorption. Moreover, both Freundlich and Langmuir adsorption isotherms were used to evaluate the experimental data. The results indicated that Langmuir isotherm was more suitable to describe the adsorption characteristics of dolomite. Maximum adsorption capacity of phosphate by dolomite was found to be 4.76 mg phosphorous/g dolomite. Thermodynamic studies showed that phosphate adsorption was exothermic. The study implies that dolomite is an excellent low cost material for phosphate removal in wastewater treatment process.

Magnetically separable ZrO2@SiO2@Fe3O4 for selective phosphate removal from wastewater

2019 ◽  
Vol 26 (2) ◽  
pp. 88-96
Author(s):  
Baile Wu ◽  
Xiaoyan Li ◽  
Irene Man Chi Lo
Keyword(s):  
Magnetic Separation ◽  
Adsorption Kinetics ◽  
Separation Efficiency ◽  
Renewable Resource ◽  
Phosphate Removal ◽  
Water Bodies ◽  
Molar Ratio ◽  
Phosphate Adsorption ◽  
Confined Water ◽  
Design Effectiveness

Phosphorus (P), which is a non-renewable resource, has been extensively used in agricultural and industrial fields. However, the release of P into surface water through agricultural runoffs and wastewater can cause enrichment of P and eutrophication in confined water bodies. Hence, a novel technology that can remove phosphate (major species of P in water) from water bodies for eutrophication prevention and recover phosphate for minimising the loss of P resource is desired. Adsorption is a preferable approach for phosphate removal due to its simplicity of design, effectiveness even at low P concentrations, and potential for recovery. The use of zirconium-based adsorbents for phosphate removal from wastewater has received increasing attention. However, challenges remain to recover zirconium-based adsorbents. In this study, zirconium oxide-based superparamagnetic adsorbents (i.e. ZrO2@SiO2@Fe3O4) were developed for phosphate removal from wastewater. Magnetic separation efficiency, phosphate adsorption kinetics and isotherm, effects of coexisting anions and organic matters, and reusability are reported. The developed ZrO2@SiO2@Fe3O4 has an excellent magnetic separation efficiency of > 98%, fast adsorption kinetics, high adsorption capacity at low phosphate concentrations, and strong selectivity for phosphate even at a competitive anion (i.e. Cl-, NO3-, SO42- and HCO3-) to phosphate molar ratio of 100:1 and humic acid (HA) concentration of 100 mg C/L. Adsorption-desorption cyclic experiments demonstrated the good reusability of the ZrO2@SiO2@Fe3O4.

Influence of phosphate species on green rust I transformation and local structure and morphology of γ-FeOOH

2011 ◽  
Vol 53 (8) ◽  
pp. 2446-2452 ◽  
Author(s):  
Gadadhar Sahoo ◽  
Shun Fujieda ◽  
Kozo Shinoda ◽  
Shigeru Suzuki
Keyword(s):  
Local Structure ◽  
Green Rust ◽  
Structure And Morphology ◽  
Phosphate Species

Adsorption Kinetics of Phosphate on Ceria-Based Adsorbent

2013 ◽  
Vol 726-731 ◽  
pp. 1668-1672
Author(s):  
Bin Li ◽  
Hong Bin Wang ◽  
Yan Yuan
Keyword(s):  
Kinetic Equation ◽  
Influencing Factors ◽  
Adsorption Kinetics ◽  
Adsorption Process ◽  
Close Relation ◽  
Phosphate Adsorption ◽  
Order Kinetic ◽  
Adsorbent Surface ◽  
Kinetics Of ◽  
Order Kinetic Equation

The adsorption kinetics and influencing factors deduction showed that adsorption process accorded with a second-order kinetic equation according to academic hypothesis. The result was validated by the phosphate adsorption onto Veria-Based adsorbent. The factor (m/V)bhad the close relation with the adsorption speed and the adsorbent dosage, intensity exponent b=0.44 (0b1) in this test condition. All the results show that phosphate adsorption on the adsorbent surface was mono-layer chemisorptions and that the hypothesis of kinetic inference was reasonable.

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