Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4

This study describes the behavior of potential slow-release fertilizers (SRF), prepared by the mechanochemical activation of calcined Mg2Al-CO3 or Mg2Fe-CO3 layered double hydroxides (LDH) mixed with dipotassium hydrogen phosphate (K2HPO4). The effects of LDH thermal treatment on P/K release behavior were investigated. Characterizations of the inorganic composites before and after release experiments combined X-Ray diffraction (XRD), Fourier-transform infra-red spectroscopy (FTIR), solid-state nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The best release profile (<75% in 28 days and at least 75% release) was obtained for MgAl/K2HPO4 (9 h milling, 2:1 molar ratio, MR). Compared to readily used K2HPO4, milling orthophosphate into LDH matrices decreases its solubility and slows down its release, with 60% and 5.4% release after 168 h for MgAl/K2HPO4 and MgFe/K2HPO4 composites, respectively. Mechanochemical addition of carboxymethylcellulose to the LDH/K2HPO4 composites leads to a noticeable improvement of P release properties.

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Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

Minerals ◽

10.3390/min9090507 ◽

2019 ◽

Vol 9 (9) ◽

pp. 507 ◽

Cited By ~ 2

Author(s):

Maxim Rudmin ◽

Elshan Abdullayev ◽

Alexey Ruban ◽

Ales Buyakov ◽

Bulat Soktoev

Keyword(s):

Milling Time ◽

Slow Release ◽

Mechanochemical Activation ◽

Structural Characteristics ◽

Fluorescence Analysis ◽

Planetary Mill ◽

X Ray Diffraction ◽

Mechanochemical Method ◽

X Ray ◽

Slow Release Fertilizers

We investigated the mechanochemical synthesis of complex slow release fertilizers (SRF) derived from glauconite. We studied the effectiveness of the mechanical intercalation of urea into glauconite using planetary and ring mills. The potassium-nitric complex SRFs were synthesized via a mechanochemical method mixing glauconite with urea in a 3:1 ratio. The obtained composites were analyzed using X-ray diffraction analysis, scanning electron microscopy, X-ray fluorescence analysis, and infrared spectroscopy. The results show that as duration of mechanochemical activation increases, the mineralogical, chemical, and structural characteristics of composites change. Essential modifications associated with a decrease in absorbed urea and the formation of microcrystallites were observed when the planetary milling time increased from 5 to 10 min and the ring milling from 15 to 30 min. Complete intercalation of urea into glauconite was achieved by 20 min grinding in a planetary mill or 60 min in a ring mill. Urea intercalation in glauconite occurs much faster when using a planetary mill compared to a ring mill.

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Gas-Phase Hydrogenation of Furfural to Furfuryl Alcohol over Cu-ZnO-Al2O3 Catalysts Prepared from Layered Double Hydroxides

Catalysts ◽

10.3390/catal10050486 ◽

2020 ◽

Vol 10 (5) ◽

pp. 486

Author(s):

Guillermo R. Bertolini ◽

Carmen P. Jiménez-Gómez ◽

Juan Antonio Cecilia ◽

Pedro Maireles-Torres

Keyword(s):

Gas Phase ◽

Aging Time ◽

Layered Double Hydroxides ◽

Furfuryl Alcohol ◽

Precipitation Method ◽

Molar Ratio ◽

X Ray ◽

General Chemical ◽

Co Precipitation ◽

Double Hydroxides

Several layered double hydroxides (LDHs) with general chemical composition (Cu,Zn)1−xAlx(OH)2(CO3)x/2·mH2O have been synthesized by the co-precipitation method, maintaining a (M2+/M3+) molar ratio of 3, and varying the Cu2+/Zn2+ molar ratio between 0.2 and 6.0. After calcination and reduction steps, Cu/ZnO/Al2O3 catalysts were synthesized. These catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 thermoprogrammed reduction (H2-TPR), N2 adsorption-desorption at −196 °C, N2O titration, X-ray photoelectron miscroscopy (XPS), NH3-thermoprogramed desorption (NH3-TPD) and CO2- thermoprogrammed desorption (CO2-TPD). The characterization data revealed that these catalysts are mainly meso-and macroporous, where Cu, ZnO and Al2O3 are well dispersed. The catalytic results show that these catalysts are active in the gas-phase hydrogenation of furfural, being highly selective to furfuryl alcohol (FOL) and reaching the highest FOL yield for the catalyst with a Cu2+/Zn2+ molar ratio of 1. In an additional study, the influence of the aging time on the synthesis of the LDHs was also evaluated. The catalytic data revealed that the use of shorter aging time in the formation of the LDH has a beneficial effect on the catalytic behavior, since more disordered structures with a higher amount of available Cu sites is obtained, leading to a higher yield towards FOL (71% after 5 h of time-on-stream at 210 °C).

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Synthesis of Mg-Fe layered double hydroxides and its application as catalyst for Friedel-Crafts benzoylation

Science and Technology Development Journal ◽

10.32508/stdj.v19i4.636 ◽

2016 ◽

Vol 19 (4) ◽

pp. 185-193

Author(s):

Phuong Thi Minh Nguyen ◽

Phuong Hoang Tran ◽

Chinh Quoc Nguyen

Keyword(s):

Metal Oxides ◽

Layered Double Hydroxides ◽

Coprecipitation Method ◽

Mixed Metal Oxides ◽

X Ray Diffraction ◽

X Ray ◽

Mixed Metal ◽

Before And After ◽

Double Hydroxides

Mg-Fe layered double hydroxides were synthesized by the coprecipitation method with different of Mg/Fe ratio (2/1, 3/1 and 4/1) and then were thermally transformed into mixed metal oxides. The obtained materials before and after the calcination at 450 oC were characterized by X-ray diffraction (XRD), SEM, BET, TGA, ICP. The samples were used as a catalyst for Friedel-Crafts benzoylation reactions. The catalyst can be easily separated and recycled compared to the traditional one.

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LAYERED DOUBLE HYDROXIDES: NANOMATERIALS FOR APPLICATIONS IN AGRICULTURE

Revista Brasileira de Ciência do Solo ◽

10.1590/01000683rbcs2015081 ◽

2015 ◽

Vol 39 (1) ◽

pp. 1-13 ◽

Cited By ~ 39

Author(s):

Luíz Paulo Figueredo Benício ◽

Rejane Alvarenga Silva ◽

Júnia Aparecida Lopes ◽

Denise Eulálio ◽

Rodrigo Morais Menezes dos Santos ◽

...

Keyword(s):

Wastewater Treatment ◽

Layered Double Hydroxides ◽

Slow Release ◽

Structural Characteristics ◽

Synthesis Methods ◽

Double Hydroxides ◽

Near Future

The current research aims to introduce Layered Double Hydroxides (LDH) as nanomaterials to be used in agriculture, with particular reference to its use as storage and slow release matrix of nutrients and agrochemicals for plant growing. Structural characteristics, main properties, synthesis methods and characterization of LDH were covered in this study. Moreover, some literature data have been reported to demonstrate their potential for storage and slow release of nitrate, phosphate, agrochemicals, besides as being used as adsorbent for the wastewater treatment. This research aims to expand, in near future, the investigation field on these materials, with application in agriculture, increasing the interface between chemistry and agronomy.

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Photocatalytic Degradation of 2,4,6-Trichlorophenol by MgO–MgFe2O4 Derived from Layered Double Hydroxide Structures

Catalysts ◽

10.3390/catal9050454 ◽

2019 ◽

Vol 9 (5) ◽

pp. 454 ◽

Cited By ~ 5

Author(s):

Esthela Ramos-Ramírez ◽

Francisco Tzompantzi-Morales ◽

Norma Gutiérrez-Ortega ◽

Héctor G. Mojica-Calvillo ◽

Julio Castillo-Rodríguez

Keyword(s):

Photocatalytic Degradation ◽

Layered Double Hydroxides ◽

X Ray Diffraction ◽

Application Study ◽

Toxic Compounds ◽

X Ray ◽

Thermally Activated ◽

Double Hydroxide ◽

Double Hydroxides ◽

Scanning Electron

In recent years, the search for solutions for the treatment of water pollution by toxic compounds such as phenols and chlorophenols has been increasing. Phenols and their derivatives are widely used in the manufacture of pesticides, insecticides, paper, and wood preservers, among other things. Chlorophenols are partially biodegradable but not directly photodegradable by sunlight and are extremely toxic—especially 2,4,6-trichlorophenol, which is considered to be potentially carcinogenic. As a viable proposal to be applied in the treatment of water contaminated with 2,4,6-trichlorophenol, this paper presents an application study of the thermally activated Mg/Fe layered double hydroxides as photocatalysts for the mineralization of this contaminant. Activated Mg/Fe layered double hydroxides were characterized by X-ray diffraction, thermal analysis, N2 physisorption, and scanning electron microscopy with X-ray dispersive energy. The results of the photocatalytic degradation of 2,4,6-trichlorophenol in aqueous solution showed good photocatalytic activity, with an efficiency of degradation of up to 93% and mineralization of 82%; degradation values which are higher than that of TiO2-P25, which only reached 18% degradation. The degradation capacity is attributed to the structure of the MgO–MgFe2O4 oxides derived from double laminate hydroxide Mg/Fe. A path of degradation based on a mechanism of superoxide and hollow radicals is proposed.

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CHARACTERISTIC OF XONOTLITE SYNTHESIZED BY HYDROTHERMAL REACTION USING RICE HUSK ASH AND ITS APPLICATION TO ABSORB CHROME (III) SOLUTION

Materiali in tehnologije ◽

10.17222/mit.2021.233 ◽

2021 ◽

Vol 55 (6) ◽

Author(s):

Trung Kien Pham ◽

Tran Ngo Quan

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Hydrothermal Reaction ◽

Mekong Delta ◽

Molar Ratio ◽

X Ray ◽

Vis Spectroscopy ◽

Xrf Scanning ◽

Before And After ◽

Chrome Iii

In this paper, we report on synthesizing xonotlite, calcium silicate hydrate (CSH), via a hydrothermal reaction using rice husk from the Mekong Delta, Vietnam. The rice husks were burnt at 1000 °C for 3 h. Grey rice husk ash was collected, then mixed with Ca(OH)2 at a Ca/Si molar ratio of 1 : 1. This was followed by a hydrothermal reaction at 180 °C for 24 h and 48 h to obtain the xonotlite mineral. Before and after adsorption, 3-mm xonotlite pellets were thoroughly characterized using X-ray diffractometry (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and ultraviolet-visible (UV-VIS) spectroscopy. This material has potential application in chromium(III) removal during a chrome-plating process. The adsorption efficiency of the 3-mm pellet samples reached more than 76 % after 12 h.

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Lysine-Functionalized Layered Double Hydroxides For The Antibiotics’ Efficient Removal: Controllable Fabrication Via BBD Model And Removing Mechanism

10.21203/rs.3.rs-1115746/v1 ◽

2021 ◽

Author(s):

Yuying Hu ◽

Susu Liu ◽

Min Qiu ◽

Xiaohuan Zheng ◽

Xiaoming Peng ◽

...

Keyword(s):

Layered Double Hydroxides ◽

Adsorption Mechanism ◽

Electrostatic Attraction ◽

Adsorption Behavior ◽

Molar Ratio ◽

Order Kinetic ◽

Efficient Removal ◽

Adsorption Processes ◽

Controllable Fabrication ◽

Double Hydroxides

Abstract Ly @ FeZn layered double hydroxides (LDHs) controllable fabrication based on Box-Behnken Design (BBD) model was fabricated, and presented stable and efficient removal performance for Ciprofloxacin (CIP), Norfloxacin (NOR) and Ofloxacin (OFL) removal. It should be noted that Ly @ FeZn had different adsorption behavior towards CIP, NOR and OFL. Furthermore, the Ly @ FeZn was characterized by SEM, XRD, FT-IR and XPS. Results revealed the optimized fabrication condition (temperature of 60 °C, Fe / Zn molar ratio of 0.5 and the lysine dosage of 5.8 mmol) for the removing efficient. The highest adsorption capacity of CIP, NOR and OFL were 193.83, 190.20 and 62.12 mg/g, respectively. Adsorption kinetics of both CIP and NOR were well simulated with the pseudo-first-order kinetic model, while that of OFL was well-described by the pseudo-second-order. Moreover, the adsorption thermodynamics of CIP and NOR on Ly @ FeZn indicated that the adsorption processes were exothermal, feasible and spontaneous. It was worth noting that the adsorption mechanism of Ly @ FeZn for CIP and NOR were the synergistic reaction of electrostatic attraction, chemical bonding and flocculation. On the other side, the adsorption behavior of OFL was relatively low, and the adsorption mechanism was only electrostatic attraction.

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Layered Double Hydroxides as Slow-Release Fertilizer Compounds for the Micronutrient Molybdenum

Journal of Agricultural and Food Chemistry ◽

10.1021/acs.jafc.1c06056 ◽

2021 ◽

Author(s):

Maarten Everaert ◽

Erik Smolders ◽

Mike J. McLaughlin ◽

Ivan Andelkovic ◽

Simon Smolders ◽

...

Keyword(s):

Layered Double Hydroxides ◽

Slow Release ◽

Slow Release Fertilizer ◽

Double Hydroxides

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High efficient photocatalytic activity of Zn-Al-Ti layered double hydroxides nanocomposite

MATEC Web of Conferences ◽

10.1051/matecconf/201814901087 ◽

2018 ◽

Vol 149 ◽

pp. 01087 ◽

Cited By ~ 1

Author(s):

F. Amor ◽

A. Diouri ◽

I. Ellouzi ◽

F. Ouanji ◽

M. Kacimi

Keyword(s):

Methylene Blue ◽

Photocatalytic Activity ◽

Uv Irradiation ◽

Layered Double Hydroxides ◽

Removal Rate ◽

X Ray Diffraction ◽

Simple Method ◽

X Ray ◽

High Efficient ◽

Double Hydroxides

This work establishes a simple method for synthesising layered double hydroxides (LDHs) powders with coprecipitation. The characteristics of the samples were investigated y X-ray diffraction (XRD), scanning electron microscopy (SEM) and spectrophotometer UV–Vis (DRS). Non-uniform distribution was shown for LDHs samples by SEM. Photocatalytic efficiencies were tested using methylene blue (MB) dye as a model contaminant under UV irradiation. In particular, Zn–Al-Ti LDH exhibited an excellent performance towards MB degradation compared with commercial TiO2 nanoparticles. Methylene blue removal percentage was reached at almost 100%, whereas commercial TiO2 reached a removal rate of only 66% under the same conditions within 20 min. The aim of the current work is to prepare Zn-Al-Ti layered double hydroxides nanocomposite and to evaluate their photocatalytic activity in the removal of methylene blue under UV irradiation.

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