scholarly journals Mg–Al-Layered Double Hydroxide (LDH) Modified Diatoms for Highly Efficient Removal of Congo Red from Aqueous Solution

2020 ◽  
Vol 10 (7) ◽  
pp. 2285 ◽  
Author(s):  
Ganesan Sriram ◽  
U. T. Uthappa ◽  
Dusan Losic ◽  
Madhuprasad Kigga ◽  
Ho-Young Jung ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Congo Red ◽  
Precipitation Method ◽  
Efficient Removal ◽  
Adsorption Capacities ◽  
Promising Application ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Very High ◽  
Cr Removal

In this work, diatomaceous earth (DE) or diatoms are modified with Mg–Al-layered double hydroxide (DE-LDH) using the facile co-precipitation method to demonstrate their application for the removal of toxic dyes such as Congo Red (CR), which was used as a model. Field emission scanning electron microscopy (FE-SEM) characterization confirms the successful modification of diatom microcapsules structures, showing their surface decorated with LDH nano patches with sheet-like morphologies. The surface area of the DE was enhanced from 28 to 51 m2/g after modification with LDH. The adsorption studies showed that the maximum CR removal efficiency of DE and DE-LDH was ~15% and ~98%, respectively at pH 7, which is a significant improvement compared with unmodified DE. The maximum adsorption capacities of DE-LDH were improved ten times (305.8 mg/g) compared with the bare DE (23.2 mg/g), showing very high adsorption performances. The recyclability study of DE-LDH up to five cycles, after desorbing CR either by methanol or by NaOH, showed the efficient removal of the CR by up to three cycles via adsorption. The presented study suggests the promising application of DE-LDH as an effective material for application in the removal of CR from aqueous solutions for industrial wastewater treatment.

scholarly journals Structural Stability of Ni/Al Layered Double Hydroxide Supported on Graphite and Biochar Toward Adorption of Congo Red

2021 ◽  
Vol 6 (2) ◽  
pp. 85-95
Author(s):  
Patimah Mega Syah Bahar Nur Siregar ◽  
Neza Rahayu Palapa ◽  
Alfan Wijaya ◽  
Erni Salasia Fitri ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Layered Double Hydroxide ◽  
Congo Red ◽  
High Performance ◽  
Precipitation Method ◽  
First Order ◽  
Xrd Diffraction ◽  
Co Precipitation ◽  
Double Hydroxide

In this research, Ni/Al layered double hydroxide (LDH) was modified by using co-precipitation method to generate Ni/Al-graphite (Ni/Al-GF) and Ni/Al-biochar (Ni/Al-BC). The adsorbents were applied to remove Congo Red from aqueous solution. The obtained samples were characterized by using XRD, FTIR, BET and TG-DTA. The XRD diffraction pattern of Ni/Al LDH, Ni/Al-GF, and Ni/Al-BC presented the formation of composite with decreasing crystallinity. The surface area modified LDHs was higher than the pristine materials, which was obtained 15.106 m2/g, 21.595 m2/g and 438.942 m2/g for Ni/Al-LDH, Ni/Al-GF, Ni/Al-BC respectively. The adsorption of Congo Red on the materials was tested at diferent parameters and the results exhibited that Congo Red adsorption on LDHs were pseudo-first-order (PFO) kinetic, spontaneous, endothermic and followed Langmuir model. The adsorbents removed Congo Red by high performance stability with adsorption capacity was 116.297 mg/g for Ni/Al-GF and 312.500 mg/g for Ni/Al-BC. These adsorption capacity was higher than the pristine LDH (61.728 mg/g). The regeneration process which carried out for five cycles showed that Ni/Al-GF and Ni/Al-BC have stable structures as reuse adsorbents for Congo Red from aqueous solution.

An elegant synthesis of chitosan grafted hydrotalcite nano-bio composite material and its effective catalysis for solvent-free synthesis of jasminaldehyde

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 94562-94570 ◽  
Author(s):  
Jacky H. Adwani ◽  
Noor-ul H. Khan ◽  
Ram S. Shukla
Keyword(s):  
Composite Material ◽  
Layered Double Hydroxide ◽  
Solvent Free ◽  
Precipitation Method ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Solvent Free Synthesis

A novel nano-bio composite of chitosan and a layered double hydroxide elegantly synthesized by a co-precipitation method had effectively and selectively catalysed the jasminaldehyde synthesis.

scholarly journals Photodecolourization of congo red dye in presence of Ni3+ layered double hydroxide

2021 ◽  
Vol 30 ◽  
pp. 02010
Author(s):  
Irina Ryltsova ◽  
Evgenia Tarasenko ◽  
Olga Lebedeva
Keyword(s):  
Layered Double Hydroxide ◽  
Congo Red ◽  
Uv Light ◽  
Order Kinetic ◽  
X Ray ◽  
Congo Red Dye ◽  
Order Kinetic Model ◽  
Co Precipitation ◽  
Red Dye ◽  
Double Hydroxide

Layered double hydroxide containing Ni3+ (Mg/AlNi-LDH) was successfully synthesized by co-precipitation in an oxidizing media. The resulted product was characterized using X-ray diffraction, wavelength dispersive X-ray fluorescence spectrometry. The activity of Mg/AlNi-LDH in the process of photodegradation of Congo red dye using UV light irradiation was evaluated. The initial rate of photodegradation of the dye in the presence of LDH is 1.6 times higher than that of UV irradiated solution. The kinetic data obtained for photodegradation process can be adequately described by pseudo-first-order kinetic model. The presence of Mg/AlNi – LDH leads to increased photodegradation yield compared to destruction only by UV irradiation.

Fabrication of TiO2@ZnAl-layered double hydroxide based anode material for dye-sensitized solar cell

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10912-10918 ◽  
Author(s):  
Leila Jafari Foruzin ◽  
Zolfaghar Rezvani ◽  
Kamellia Nejati
Keyword(s):  
Solar Cell ◽  
Anode Material ◽  
Layered Double Hydroxide ◽  
Dye Sensitized Solar Cell ◽  
Precipitation Method ◽  
Dye Sensitized ◽  
Co Precipitation ◽  
Double Hydroxide

A TiO2@ZnAl-layered double hydroxide nanocomposite was prepared by the co-precipitation method; then, the product was calcined in order to obtain the TiO2@MMO nanocomposite, and use as anode material in dye-sensitized solar cell (DSSC).

scholarly journals Oxidation of Cysteinate Anions Immobilized in the Interlamellar Space of CaAl-Layered Double Hydroxide

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1202
Author(s):  
Zita Timár ◽  
Truong Ngoc Hung ◽  
Cora Pravda ◽  
Zoltán Kónya ◽  
Ákos Kukovecz ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Room Temperature ◽  
Precipitation Method ◽  
Confined Space ◽  
Oxidation Reactions ◽  
Sulfenic Acid ◽  
X Ray ◽  
Mild Conditions ◽  
Co Precipitation ◽  
Double Hydroxide

L-Cysteinate-intercalated CaAl-layered double hydroxide (LDH) was prepared by the co-precipitation method producing highly crystalline hydrocalumite phase with a well-pillared interlayer gallery. The obtained materials were characterized by X-ray diffractometry, IR as well as Raman spectroscopies. By performing interlamellar oxidation reactions with peracetic acid as oxidant, oxidation of cysteinate to cystinate in aqueous and cysteinate sulfenic acid in acetonic suspensions occurred. The oxidations could be performed under mild conditions, at room temperature, under neutral pH and in air. It has been shown that the transformation pathways are due to the presence of the layered structure, that is, the confined space of the LDH behaved as molecular reactor.

scholarly journals Carbon-layered double hydroxide nanocomposite for efficient removal of inorganic and organic based water contaminants – unravelling the adsorption mechanism

2021 ◽  
Author(s):  
Sukanya Kundu ◽  
Milan Kanti Naskar
Keyword(s):  
Layered Double Hydroxide ◽  
Porous Carbon ◽  
Adsorption Mechanism ◽  
Precipitation Process ◽  
Efficient Removal ◽  
Water Contaminants ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Inorganic And Organic

Carbon-layered double hydroxide (C-LDH) nanocomposites were synthesized by a simple homogeneous co-precipitation process using as-prepared porous carbon and Al, Mg, Ca precursor salts of LDH. The synthesized adsorbent was used...

scholarly journals A facile synthesis of layered double hydroxide based core@shell hybrid materials

2020 ◽  
Vol 44 (24) ◽  
pp. 10095-10101
Author(s):  
Meng Lyu ◽  
Chunping Chen ◽  
Jean-Charles Buffet ◽  
Dermot O’Hare
Keyword(s):  
Layered Double Hydroxide ◽  
Hybrid Materials ◽  
Precipitation Method ◽  
Core Shell ◽  
Facile Synthesis ◽  
Co Precipitation ◽  
Double Hydroxide

A simple and scalable co-precipitation method to obtain zeolite Z13X@Mg2Al–CO3-LDH and Mg-MOF-74@Mg2Al–CO3-LDH has been reported.

Inorganic layered double hydroxides as a 4-hexyl resorcinol delivery system for topical applications

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77709-77716 ◽  
Author(s):  
Damodar Mosangi ◽  
Sreejarani Kesavan Pillai ◽  
Lumbidzani Moyo ◽  
Suprakas Sinha Ray
Keyword(s):  
Controlled Release ◽  
Layered Double Hydroxide ◽  
Delivery System ◽  
Layered Double Hydroxides ◽  
Skin Tone ◽  
Precipitation Method ◽  
Co Precipitation ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Topical Applications

In this study, the hydrophobic even skin tone active, 4-hexylresorcinol is intercalated into a Zn–Al layered double hydroxide by co-precipitation method and used as controlled release ingredient in a skin care formulation.

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