Enhanced phosphate removal by nano-lanthanum hydroxide embedded silica aerogel composites: superior performance and insights into specific adsorption mechanism

2021 ◽  
pp. 120365
Author(s):  
Bing Zhang ◽  
Longqian Xu ◽  
Zhenyu Zhao ◽  
Shuai Peng ◽  
Chao Yu ◽  
...  
Keyword(s):  
Silica Aerogel ◽  
Adsorption Mechanism ◽  
Phosphate Removal ◽  
Specific Adsorption ◽  
Superior Performance ◽  
Lanthanum Hydroxide

Adsorption mechanism of NH3, NO, and O2 molecules over FexOy/AC catalyst surface: a DFT-D3 study

2021 ◽  
Author(s):  
Chaoyue Xie ◽  
Yunlan Sun ◽  
Baozhong Zhu ◽  
Weiyi Song ◽  
Minggao Xu
Keyword(s):  
Activated Carbon ◽  
Adsorption Mechanism ◽  
Catalyst Surface ◽  
Specific Adsorption ◽  
Adsorption Mechanisms ◽  
Iron Based ◽  
Iron Based Catalysts ◽  
Supported Iron ◽  
Denox Efficiency

Activated carbon-supported iron-based catalysts (FexOy/AC) show excellent deNOx efficiency. However, the specific adsorption mechanisms of NH3, NO, and O2 molecules on their surfaces are still unknown. In this study, the...

Investigation of phosphate removal mechanisms by a lanthanum hydroxide adsorbent using p-XRD, FTIR and XPS

2021 ◽  
Vol 557 ◽  
pp. 149838
Author(s):  
Lin Zhang ◽  
Yanhong Liu ◽  
Yulong Wang ◽  
Xuhui Li ◽  
Yangyang Wang
Keyword(s):  
Phosphate Removal ◽  
Lanthanum Hydroxide ◽  
Removal Mechanisms

scholarly journals Adsorption-Oxidation Mechanism of δ-MnO2 to Remove Methylene Blue

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Ge Yan ◽  
Pu Wang ◽  
Yuqian Li ◽  
Zhangjie Qin ◽  
Shuai Lan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Adsorption Mechanism ◽  
Ph Value ◽  
Oxidation Mechanism ◽  
Superior Performance ◽  
Adsorption Ability ◽  
Initial Ph ◽  
Effects Of Ph ◽  
Ph Conditions ◽  
Positively Charged

The material, δ-MnO2, has exhibited superior performance on the removal of methylene blue (MB), but the process is significantly impacted by pH, and the impacting mechanism is still unclear. In this study, the effects of pH on the removal mechanism of MB using synthesized δ-MnO2 were investigated by distinguishing the adsorption and oxidation of MB by δ-MnO2 during the removal process in the dark. The results show that the total removal efficiency of MB by δ-MnO2 decreased significantly with an increase in the pH. MB could be removed by δ-MnO2 via an adsorption mechanism and oxidation mechanism, and the proportion of adsorptive removal and oxidative removal was different under different pH conditions. With an increase in the initial pH from 2.00 to 8.05, the redox potential of δ-MnO2 decreased, and its oxidation ability for the removal of MB also gradually decreased. In contrast, the surface negative charges of δ-MnO2 increased with an increase in the pH, and the adsorption ability towards positively charged MB also gradually increased. This indicates that the effects of pH on the removal of MB by δ-MnO2 are primarily dominated by its influence on the oxidation ability of δ-MnO2. In addition, it is further proved that the pH value has a significant effect on the oxidation and adsorption of MB on δ-MnO2. Moreover, the significant effects of pH on the oxidation of MB by δ-MnO2 are further demonstrated by observing the changes in Mn2+ and the UV-Vis spectra of intermediate products during the reaction, as well as the changes in the FTIR and XPS characterizations of δ-MnO2 after the reaction.

Development of lanthanum hydroxide loaded on molecular sieve adsorbent and mechanistic study for phosphate removal

2018 ◽  
Vol 768 ◽  
pp. 953-961 ◽  
Author(s):  
Ling Yuan ◽  
Zhaofu Qiu ◽  
Yunqing Lu ◽  
Muhammad Tariq ◽  
Lin Yuan ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Phosphate Removal ◽  
Mechanistic Study ◽  
Lanthanum Hydroxide

Precipitation of Ferric Phosphate in Activated Sludge: A Chemical Model and Its Verification

1989 ◽  
Vol 21 (4-5) ◽  
pp. 325-337 ◽  
Author(s):  
Cornelia Luedecke ◽  
Slawomir W. Hermanowicz ◽  
David Jenkins
Keyword(s):  
Activated Sludge ◽  
Adsorption Mechanism ◽  
Solubility Product ◽  
Ferric Hydroxide ◽  
Phosphate Removal ◽  
Chemical Model ◽  
Additional Mechanism ◽  
Ph Values ◽  
Ferric Phosphate ◽  
Proposed Model

A chemical model of ferric phosphate precipitation was developed describing ferric hydroxy-phosphate precipitation either alone or together with ferric hydroxide. Conditions for formation of one or two precipitates are examined. The model also incorporates an additional mechanism for phosphate removal through adsorption of PO43− ions on the precipitate. Experimental verification of the proposed model was carried out in lab-scale batch and continuous activated sludge units fed with municipal primary effluent and at five pH values in the range of 6.5 to 8.0. Solubility of ferric phosphate in the activated sludge system was significantly different from that reported in the literature for distilled water systems and was pH-dependent with a minimum at pH of approx. 7.0. It is proposed that the composition of precipitating ferric hydroxy-phosphate can be represented by the empirical formula Fe2.5PO4(OH)4.5. Corresponding solubility product was estimated at pKsp=96.7. The adsorption mechanism has an important effect on total phosphate removal, especially at low residual phosphate concentrations.

Preparation of cobalt-containing spinel oxides as novel adsorbents for efficient phosphate removal

2018 ◽  
Vol 4 (10) ◽  
pp. 1671-1684 ◽  
Author(s):  
Ting Li ◽  
Taiwan Liao ◽  
Xiangde Su ◽  
Xiang Yu ◽  
Boping Han ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Mechanism ◽  
Phosphate Removal ◽  
Spinel Oxides ◽  
The Relationship

We prepared a series of novel and efficient phosphate removal adsorbents, figured out the adsorption mechanism in depth and revealed the relationship between the properties of adsorbents and their adsorption capacity.

Phosphate removal from water by a novel zeolite/lanthanum hydroxide hybrid material prepared from coal fly ash

2015 ◽  
Vol 50 (12) ◽  
pp. 1298-1305 ◽  
Author(s):  
Jie Xie ◽  
Li Lai ◽  
Lidan Lin ◽  
Deyi Wu ◽  
Zhenjia Zhang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Hybrid Material ◽  
Coal Fly Ash ◽  
Phosphate Removal ◽  
Lanthanum Hydroxide

scholarly journals Synthesis of mesoporous lanthanum hydroxide with enhanced adsorption performance for phosphate removal

RSC Advances ◽  
2019 ◽  
Vol 9 (27) ◽  
pp. 15257-15264 ◽  
Author(s):  
Kyungmin Kim ◽  
Dujin Kim ◽  
Taeyeon Kim ◽  
Bong-Geun Kim ◽  
Donghyun Ko ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Phosphate Removal ◽  
High Adsorption ◽  
Efficient Removal ◽  
Lanthanum Hydroxide ◽  
Adsorption Performance ◽  
High Adsorption Capacity ◽  
Enhanced Adsorption

MLHO exhibited outstanding phosphate removal performance with a high adsorption capacity as well as efficient removal in low P concentrations.

Combined experimental and quantum chemical study on the adsorption mechanism of phosphorous anions on the hydrotalcite surfaces

2016 ◽  
Vol 09 (05) ◽  
pp. 1650061 ◽  
Author(s):  
Kenji Mishima ◽  
Shuang Zhang ◽  
Sho Minagawa ◽  
Naoki Kano
Keyword(s):  
Quantum Chemistry ◽  
Adsorption Mechanism ◽  
Reaction Pathway ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Phosphate Removal ◽  
Experimental Result ◽  
Stable States ◽  
Quantum Chemistry Calculations ◽  
Sorbent Materials

In the present work, the hydrotalcite-like compound [Mg6Al2(OH)[Formula: see text]]CO[Formula: see text] [Formula: see text]H2O (shorted as MgAl–CO[Formula: see text] is synthesized and the adsorption of phosphorous anions, their adsorption performance on the surface of hydrotalcites, and its mechanism are analyzed. To theoretically clarify the adsorption mechanism and adsorption structures, we perform quantum chemistry calculations of reactants, locally stable states, transition states, and products among phosphorous anion, water, and hydrotalcite in a variety of pH ranges. The experimental result shows that the efficiency of phosphate removal does not depend on pH of the solution, with which the numerical results are consistent. In particular, we identify the factors of influencing the adsorption ratio in different pH ranges from the quantum chemistry calculations: the stability of locally stable states, and the energies and locations of potential barriers along the reaction pathway relative to those of the locally stable states. The results suggest that hydrotalcites synthesized in this work are suitable as sorbent materials for the adsorption and removal of phosphorous anions from aqueous solutions.

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