Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal DOI Open Access

Tao Xue-feng,

Tao Huang, Bo Lv

et al.

Materials, Journal Year: 2020, Volume and Issue: 13(4), P. 816 - 816

Published: Feb. 11, 2020

Magnetic biochar derived from agricultural biomass has been recognized as a cost-effective sorbent for phosphate removal. This study evaluated the use of novel Fe/Mg-biochar nanocomposites (WBC1x), prepared by impregnating ground walnut shell in solution with different molar ratio Fe2+ to Mg2+, then pyrolyzing slowly, at temperature 600 °C, remove phosphate. The results showed that MgO and Fe3O4 were loaded onto successfully through impregnation-pyrolysis method composites able be separated easily magnetic field. Meanwhile, higher surface area point zero charge on WBC1x observed compared non-magnetic (WBC). Moreover, isothermal adsorption kinetics data further suggested resulted chemisorption. Additionally, maximum capacity was 6.9 mg.g−1, obtained though Langmuir–Freundlich model, which threefold than WBC, where addition could enhance markedly improving charge.

Language: Английский

Zeta potential as a tool for functional materials development DOI Creative Commons
Ana Serrano-Lotina, Raquel Portela, P. Baeza

et al.

Catalysis Today, Journal Year: 2022, Volume and Issue: 423, P. 113862 - 113862

Published: Aug. 3, 2022

The importance of the isoelectric point for preparation and characterization functional materials to understand their behavior optimize performance is highlighted, with especial focus on industrial catalysts. In different liquid-phase steps involved in synthesis, knowledge surface charge as a function pH medium fundamental, since it dynamizing agent processes such gelation, peptization, coagulation agglomeration form solid particles. Therefore, zeta potential (ζ) measurements, often based electrophoretic migration techniques, are powerful source information. basic principles introduced explain through relevant examples possibilities design. Regarding preparation, measurement control synthesis coating supports reviewed, special attention shaped supports. Aspects influence binders properties depending mutual interaction analyzed, example systems TiO2 or Al2O3 natural silicates sepiolite. Also, how ζ allows, by choosing appropriate pH, preferential impregnation noble metals porous supports, well washcoating dense ceramic monoliths Special has been paid surfaces use measurements estimate formation relative location species, apparent coverage, adsorption reactivity, establish strategies achieve specific properties.

Language: Английский

Citations

143
Pathways of biogenically excreted organic matter into soil aggregates DOI Creative Commons
Tom Guhra, Katharina Stolze, Kai Uwe Totsche

et al.

Soil Biology and Biochemistry, Journal Year: 2021, Volume and Issue: 164, P. 108483 - 108483

Published: Nov. 5, 2021

Soil organisms are recognized as ecosystem engineers and key for aggregation in soil due to bioturbation, organic matter (OM) decomposition, excretion of biogenic OM. The activity is beneficial quality, functions, nutrient cycling. These attributions based on field-scale observations that link the presence spatiotemporal changes properties can be traced back formation aggregates. This pathway encompasses a cascade processes so far not discussed comprehensively. A more general approach needs consider feedback loops between biota, active release OM by excretion, interaction with constituents, organo-mineral associations, how these become incorporated aggregated structures. Especially function biogenically excreted OM, which quite complex composition, controversial it permits or inhibits aggregation. review analyzes various roles may take an agent. We will show its depends interplay numerous factors, including environmental conditions, variety producers, composition availability type interacting mineral phase. affect aggregate three different ways: (I) bridging agent promotes surface modifications attraction, (II) separation favors formation, mobility, transport associations their further inclusion into aggregates, (III) gluing mediates stability, after external force provokes close particles. conclude takes functional simultaneously varying extent across scales. Hence, involved modification particles, enmeshment particles (im-)mobilization, facilitating All hierarchy factors comprising local community's conditions immediate environment.

Language: Английский

Citations

109
Magnetite-impregnated biochar of parthenium hysterophorus for adsorption of Cr(VI) from tannery industrial wastewater DOI Creative Commons
Jemal Fito, Mikiyas Abewaa, Thabo T.I. Nkambule

et al.

Applied Water Science, Journal Year: 2023, Volume and Issue: 13(3)

Published: Feb. 9, 2023

Abstract The tannery industry inevitably generates toxic and catastrophic wastewater, which results in a huge threat to public health water resources. Therefore, this work aimed synthesize parthenium hysterophorus-based biochar–Fe 3 O 4 composite for removal of Cr(VI) from wastewater under full factorial experimental designs the Box–Behnken, was analyzed using response surface methodology four independent factors pH (3, 6, 9), initial concentrations (40, 70, 100 mg/L), contact times (30, 60, 90 min), adsorbent doses (20, mg/100 mL). This described by high BET area 237.4 m 2 /g, XRD prominent peaks, SEM morphology corroborate FTIR multifunctionalities O–H at 3296 cm −1 , vibration ketone C–OH 1240 C–O–C 1147 Fe–O stretching 542 . maximum Cr(IV) efficiency 91.8% recorded an concentration 40 mg/L, 3, dose mL, time min, whereas minimum 17.3% observed 20 mL dose, 9, 30 min. real determined be 85.13 mg/L its remediation found 81.8%. Langmuir’s model best fit with data R 0.99 q max 400 mg/g, showing that adsorption process homogenous monolayer. In conclusion, were encouraging, appears potential candidate Cr wastewater.

Language: Английский

Citations

55
The pH dependent surface charging and points of zero charge. X. Update DOI Creative Commons
Marek Kosmulski

Advances in Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 319, P. 102973 - 102973

Published: Aug. 8, 2023

Surfaces are often characterized by their points of zero charge (PZC) and isoelectric (IEP). Different authors use these terms for different quantities, which may be equal to the actual PZC under certain conditions. Several popular methods lead results inappropriately termed PZC. This present review is limited zero-points obtained in presence inert electrolytes (halides, nitrates, perchlorates 1st group metals). IEP reported all kinds materials. metal oxides as common intersection potentiometric curves 3 or more ionic strengths (or means equivalent methods) also reported, while apparent mass titration, pH-drift method, etc. deliberately neglected. The published recent publications older overlooked previous compilations same author reported. PZC/IEP accompanied information on temperature nature concentration supporting electrolyte (if available). references reviews allow compare newest with similar materials from literature.

Language: Английский

Citations

45
Development and Modus Operandi relating Surface Structure and Ion Complexation Modeling for Important Metal (Hydr)oxides DOI
Tjisse Hiemstra, Johannes Lützenkirchen

Reviews in Mineralogy and Geochemistry, Journal Year: 2025, Volume and Issue: 91A(1), P. 13 - 84

Published: March 28, 2025

Language: Английский

Citations

2
A review of reagents applied to rare-earth mineral flotation DOI

Christopher Marion,

Ronghao Li, Kristian E. Waters

et al.

Advances in Colloid and Interface Science, Journal Year: 2020, Volume and Issue: 279, P. 102142 - 102142

Published: March 16, 2020

Language: Английский

Citations

119
Polarity in ZnO nanowires: A critical issue for piezotronic and piezoelectric devices DOI Creative Commons
Vincent Consonni, Alex M. Lord

Nano Energy, Journal Year: 2021, Volume and Issue: 83, P. 105789 - 105789

Published: Jan. 19, 2021

The polar and piezoelectric nature of the wurtzite structure ZnO nanowires with a high aspect ratio at nanoscale dimensions is interest for piezotronic devices, but number issues related to polarity are still open deserve particular attention. In this context, chemical bath deposition offers unique opportunity select O- or Zn-polarity resultant further compatible fabrication processes flexible devices. control use in grown by new way greatly enhance performance However, as an additional tunable parameter should be considered care because it has strong influence on many properties. present review intended report most important consequences After introducing basic principles involving crystal ZnO, special emphasis placed effects nucleation growth mechanisms using deposition, defect incorporation doping, electrical contacts device

Language: Английский

Citations

103
The pH dependent surface charging and points of zero charge. IX. Update DOI Creative Commons
Marek Kosmulski

Advances in Colloid and Interface Science, Journal Year: 2021, Volume and Issue: 296, P. 102519 - 102519

Published: Sept. 1, 2021

Summary of the points zero charge (PZC) and isoelectric (IEP) various materials published in recent literature older results overlooked previous compilations. The roles experimental conditions, especially temperature, nature concentration supporting electrolyte, type apparatus are emphasized. newest compared with reported reviews. Most studies were carried out whose pH dependent surface charging is already well-documented, consistent literature. Isoelectric Gd(OH)3, Sm(OH)3, TeO2 have been for first time

Language: Английский

Citations

79
Determination of Point of Zero Charge (PZC) of Concrete Particles Adsorbents DOI Open Access

Ebtehal A. Al-Maliky,

Hatem Asal Gzar,

Mohammed G. Al‐Azawy

et al.

IOP Conference Series Materials Science and Engineering, Journal Year: 2021, Volume and Issue: 1184(1), P. 012004 - 012004

Published: Sept. 1, 2021

In the present study, pH point of zero charge (pHpzc) was determined for concrete particles adsorbent. The Mass Titration (MT) Method adopted, and adsorbent used to remove fluoride from water. found be 12. data pHpzc adsorbents give information about attraction repulsion between adsorbates. mass titration technique an easy way determine studied material.

Language: Английский

Citations

77
Aqueous molybdate provides effective corrosion inhibition of WE43 magnesium alloy in sodium chloride solutions DOI Creative Commons

D. S. Kharitonov,

Małgorzata Zimowska, Jacek Ryl

et al.

Corrosion Science, Journal Year: 2021, Volume and Issue: 190, P. 109664 - 109664

Published: July 5, 2021

Corrosion and corrosion inhibition of WE43 magnesium alloy were investigated in NaCl solutions containing different amounts sodium molybdate. Electrochemical, microscopic, spectroscopic experiments utilized to examine the mechanism by molybdates. Electrochemical data showed that Na2MoO4 inhibitor provides reliable at concentrations above 100 mM. Raman XPS spectroscopy demonstrated formed surface layer consists mixed Mo(V, IV) species. This provided with an efficiency 91–99 % after 24 h exposure. A two-step oxidation-reduction aqueous molybdates was proposed.

Language: Английский

Citations

76