scholarly journals RELEASE BEHAVIOR OF DICHLORPROP FROM ZN/AL-LDH-DICHLORPROP NANOCOMPOSITE INTO CHLORIDE, CARBONATE AND PHOSPHATE SOLUTIONS

2019 ◽  
Vol 81 (2) ◽  
Author(s):  
Norhayati Hashim ◽  
Sharifah Norain Mohd Sharif ◽  
Zuhailimuna Muda ◽  
Illyas Md Isa ◽  
Suriani Abu Bakar ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sodium Chloride ◽  
Layered Double Hydroxide ◽  
Sodium Carbonate ◽  
Sodium Phosphate ◽  
Basal Spacing ◽  
Pxrd Pattern ◽  
Release Study ◽  
Double Hydroxide ◽  
Phosphate Solutions

A release study of dichlorprop phenoxyherbicides from the interlayer of a Zn/Al-layered double hydroxide-dichlorprop nanocomposite was performed with various concentrations of sodium chloride, sodium carbonate and sodium phosphate and a mixture of sodium chloride, sodium carbonate and sodium phosphate in aqueous solution. The release study of dichlorprop showed that release is dependent on the concentration of the aqueous solution. The accumulated release percentage of dichlorprop phenoxyherbicides into the solution was found to be higher in solutions containing carbonate, phosphate, and a mixture of carbonate or phosphate anions. Confirmation of the release process was confirmed by the PXRD pattern of the powder recovered from highly concentrated solutions of sodium chloride, sodium carbonate, and sodium phosphate with basal spacing of 7.8 Å, 7.6 Å and 7.4 Å, is due to chloride, carbonate, and phosphate intercalation, respectively. The kinetic study revealed that dichlorprop release into sodium carbonate and sodium phosphate solutions is governed by pseudo-second order kinetics, while release into sodium chloride solution is governed by parabolic diffusion. This study shows that a layered double hydroxide might be used as a host for the controlled release of the phenoxyherbicide dichlorprop.

scholarly journals Intercalation of Anthraquinone-2-Sulphonate into Magnesium- Aluminum Layered Double Hydroxide and its Calcined Products by Ion Exchange and Memory Effect Properties

2017 ◽  
Vol 4 (3) ◽  
pp. 175
Author(s):  
M.Z.b. Hussein ◽  
A.H. Yahaya ◽  
M. Ibrahim ◽  
M. Tahir ◽  
H. Sulimat
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Layered Double Hydroxide ◽  
Memory Effect ◽  
Layered Structure ◽  
Exchange Process ◽  
Atmospheric Condition ◽  
Basal Spacing ◽  
Pxrd Pattern ◽  
Double Hydroxide

<p>Layered double hydroxide of Mg-Al-nitrate system (LDH) was prepared and its heat<strong>-</strong>treated products (LDHTs) were obtained by calcining the LDH at 250–750 °C, for 5 hours at atmospheric condition. The LDH and the LDHTs were used as an inorganic host for the intercalation of AQ2 via ion exchange or memory effect property by exposing the LDH and LDHTs in aqueous solution containing an anion, anthraquinone-2-sulfonate (AQ2) for the formation of an organic-inorganic layered nanohybrid materials. X-ray diffractograms showed that the layered structure of LDH collapsed when it was heated at around 350 °C, and an oxide phase, MgAl<sub>2</sub>O<sub>4</sub> appeared. Due to the memory effect property, the regeneration of LDH from LDHT was observed and at the same time the AQ2 was intercalated when LDHT was treated with the aqueous solution containing AQ2. As a result, formation of an organic-inorganic layered nanohybrid material was also observed. Similarly, the same material can be formed by ion exchange of LDH with AQ2. The basal spacing of LDH was found expanded from 8.1 Å to around 20 Å in the resulting nanohybrid. This is to accommodate a bigger size of the AQ2 moiety with specific orientation inside the interlamella of the inorganic layered structure that warrants the layer expansion. Incomplete intercalation and ion exchange process resulted in a mixed LDH and a nanohybrid phase as observed in the PXRD pattern of the resulting material.</p>

scholarly journals Structural, Thermal and Surface Properties of a Formulated Sunscreen: Zn/Al-nitrate Layered Double Hydroxide Intercalated with 4-aminobenzoic Acid

2021 ◽  
Vol 18 (13) ◽  
Author(s):  
Fadhlin Sakina MOHD RAJIDI ◽  
Iman Nur Fathihah Abdul AZIZ ◽  
Mazlina MUSA ◽  
Rozita YAHAYA
Keyword(s):  
Benzoic Acid ◽  
Layered Double Hydroxide ◽  
Harmful Effect ◽  
Precipitation Method ◽  
Basal Spacing ◽  
Pxrd Pattern ◽  
Type Iv ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Amino Benzoic Acid

Intercalation of 4-amino benzoic acid (4-AB) into Zn/Al-nitrate layered double hydroxide (ZAL2) to form Zn/Al-4AB (ZALAB) compound was successfully synthesized from nitrate salt by using direct co-precipitation method. ZALAB compound was confirmed by Powder X-ray diffraction (PXRD) pattern with a basal spacing of 15.3 Å. The presence of COO- and C6H5NH2 functional groups of 4-AB at 1,517 and 1,178 cm–1 in Fourier transform infrared (FTIR) spectrum reinforced 4-AB intercalated into the resulting compound. Based on the thermal analysis, 4-AB in ZALAB compound was more stable compared to pure 4-AB. Breuneur, Emmet and Teller/Barret-Joyner-Halenda (BET/BJH) analyses demonstrated that ZALAB compound is a mesopores-type IV compound with 4.25 m2/g surface area. This material is an irregular shape with different sizes of particles. ZALAB is a potential sunscreen formulation that minimizes the harmful effect on the skin, improving pharmaceutical technology in the skincare treatment. HIGHLIGHTS 4-amino benzoic acid (4-AB) is a sunscreen composed of carboxylic and aromatic groups that potentially filter UV-B radiation Layered double hydroxide (LDH) is known as an ionic clay that is based on the brucite (Mg (OH)2) -like cations layers containing intercalated charge-balancing anions and water Intercalation of 4-amino benzoic acid (4-AB) into Zn/Al-nitrate layered double hydroxide (ZAL2) to form Zn/Al-4AB (ZALAB) was synthesized using direct co-precipitation method ZALAB material has a higher thermal stability compared to 4-AB in pure form GRAPHICAL ABSTRACT

Synthesis, Characterization and Sustained Release Properties of Zinc-Aluminium-9-Hydroxy-9-Flourenecarboxylate Nanocomposite

2011 ◽  
Vol 422 ◽  
pp. 102-106 ◽  
Author(s):  
Siti Halimah Sarijo ◽  
A Ahmad ◽  
Z. Jubri
Keyword(s):  
Sustained Release ◽  
Layered Double Hydroxide ◽  
Self Assembly ◽  
Plant Growth Regulator ◽  
Sodium Phosphate ◽  
Molar Ratio ◽  
Basal Spacing ◽  
Hybrid Nanocomposite ◽  
Assembly Method ◽  
Double Hydroxide

Zn-Al-9-hydroxy-9-flourenecarboxylate-layered double hydroxide, ZAF nanocomposite was successfully synthesized by direct self-assembly method with Zn to Al molar ratio, R = 4 and 0.4 M 9-hydroxy-9-flourenecarboxylate, 9H9F. Due to the inclusion of a new anion, 9H9F basal spacing expanded from 8.9 Å in the Zn-Al-layered double hydroxide, ZAL to 13.2 Å in the ZAF. The FTIR spectra of the hybrid nanocomposite show resemblance peaks of the ZAL and 9H9F indicating the inclusion of the organic compound into the LDH interlamellae. The percentage loading of 9H9F was found to be 75.9 % (w/w). Sustained release of 9H9F from ZAF into various aqueous solutions was found to be dependent on the incoming anion, with the percentage saturated release of 94%, 72%, and 15% in sodium phosphate, sodium sulfate and sodium chloride aqueous solution 0.0005 M, respectively. This study indicates that ZAL can be used as a host carrier for plant growth regulator, 9H9F with sustained release capability.

Investigation of layered double hydroxide/carbon dot nanocomposite on removal efficiency of Pb2+ from aqueous solution

2021 ◽  
pp. 116774
Author(s):  
Fataneh Vasheghani Farahani ◽  
Mohammad Hassan Amini ◽  
Seyed Hamid Ahmadi ◽  
Seyed Amirabbas Zakaria
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxide ◽  
Removal Efficiency ◽  
Carbon Dot ◽  
Double Hydroxide

scholarly journals Anti-ulcerant kynurenic acid molecules intercalated Mg/Al-layered double hydroxide and its release study

2018 ◽  
Vol 156 ◽  
pp. 28-35 ◽  
Author(s):  
Ágota Deák ◽  
Edit Csapó ◽  
Ádám Juhász ◽  
Imre Dékány ◽  
László Janovák
Keyword(s):  
Layered Double Hydroxide ◽  
Kynurenic Acid ◽  
Release Study ◽  
Double Hydroxide

Aqueous-phase synthesis of layered double hydroxide nanoplates as catalysts for the oxygen evolution reaction

2018 ◽  
Vol 47 (48) ◽  
pp. 17342-17348 ◽  
Author(s):  
Euiyoung Jung ◽  
Jae Kyeom Kim ◽  
Hyungsuk Choi ◽  
Min Hyung Lee ◽  
Taekyung Yu
Keyword(s):  
Aqueous Solution ◽  
Transition Metal ◽  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Aqueous Phase ◽  
Oxygen Evolution Reaction ◽  
Metal Salt ◽  
Catalytic Performance ◽  
Phase Synthesis ◽  
Double Hydroxide

Transition metal LDH nanoplates were synthesized by heating an aqueous solution containing a metal salt, PEG, and octylamine. The LDH nanoplates showed comparable electrochemical catalytic performance for the oxygen evolution reaction.

Removal efficiency of arsenate and phosphate from aqueous solution using layered double hydroxide materials: intercalation vs. precipitation

2010 ◽  
Vol 20 (22) ◽  
pp. 4684 ◽  
Author(s):  
Yunfeng Xu ◽  
Yingchun Dai ◽  
Jizhi Zhou ◽  
Zhi Ping Xu ◽  
Guangren Qian ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Layered Double Hydroxide ◽  
Removal Efficiency ◽  
Double Hydroxide
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