scholarly journals Synthesis, Characterization, and Application of Co-Al-Zn Layered Double Hydroxide/Hydrochar Composite for Simultaneous Removal of Cationic and Anionic Dyes

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Najma Memon ◽  
Urooj Kanwal ◽  
Abdullah Memon ◽  
Safia Sanam Memon ◽  
Saima Qayoom Memon
Keyword(s):  
Layered Double Hydroxide ◽  
Organic Dyes ◽  
Surface Heterogeneity ◽  
General Purpose ◽  
Simultaneous Removal ◽  
Surface Functional Groups ◽  
Anionic Dyes ◽  
Multivariate Technique ◽  
Characterization Studies ◽  
Double Hydroxide

Decontamination of organic dyes from wastewater requires efficient and compatible materials that must be able to remove dyes with different charges at the same time. In this study, composites of layered double hydroxide (LDH) and hydrochar (HC) were prepared and tested for use as general-purpose sorbents for the simultaneous removal of cationic and anionic dyes (i.e., methylene blue (MB), methyl orange (MO), and reactive yellow (RY)). Characterization studies reveal that the surface functional groups on composites are –OH, NO3, M–O bonds. It was observed that crystallinity of LDH decreased with an increasing amount of HC. Preliminary experiments showed that the dyes (i.e., MB, MO, and RY) were well removed simultaneously onto the composite with HC (2.0 g HC/prepared composite). This composite was selected for more experiments, and the adsorption efficiency was optimized by the multivariate technique using the response surface methodology (RSM). Removal efficiency of 100% was obtained for all three dyes with an adsorption capacity of 243, 5.3, and 16.3 µmol g−1 for MB, MO, and RY, respectively. Elovich’s initial intake rates (α) were 4,272, 441, and 99.5 mg g−1 min−1 for RY, MB, and MO, respectively. Data fitted in various models suggested second-order multiplex kinetics, where the surface heterogeneity response was sorbate dependent.

scholarly journals A new biocompatible ternary Layered Double Hydroxide Adsorbent for ultrafast removal of anionic organic dyes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Garima Rathee ◽  
Amardeep Awasthi ◽  
Damini Sood ◽  
Ravi Tomar ◽  
Vartika Tomar ◽  
...  
Keyword(s):  
Waste Water ◽  
Methyl Orange ◽  
Surface Area ◽  
Layered Double Hydroxide ◽  
Removal Efficiency ◽  
Organic Dyes ◽  
High Surface ◽  
High Surface Area ◽  
Morphological Studies ◽  
Double Hydroxide

Abstract It would be of great significance to introduce a new biocompatible Layered Double Hydroxide (LDH) for the efficient remediation of wastewater. Herein, we designed a facile, biocompatible and environmental friendly layered double hydroxide (LDH) of NiFeTi for the very first time by the hydrothermal route. The materialization of NiFeTi LDH was confirmed by FTIR, XRD and Raman studies. BET results revealed the high surface area (106 m2/g) and the morphological studies (FESEM and TEM) portrayed the sheets-like structure of NiFeTi nanoparticles. The material so obtained was employed as an efficient adsorbent for the removal of organic dyes from synthetic waste water. The dye removal study showed >96% efficiency for the removal of methyl orange, congo red, methyl blue and orange G, which revealed the superiority of material for decontamination of waste water. The maximum removal (90%) of dyes was attained within 2 min of initiation of the adsorption process which supported the ultrafast removal efficiency. This ultrafast removal efficiency was attributed to high surface area and large concentration of -OH and CO32− groups present in NiFeTi LDH. In addition, the reusability was also performed up to three cycles with 96, 90 and 88% efficiency for methyl orange. Furthermore, the biocompatibility test on MHS cell lines were also carried which revealed the non-toxic nature of NiFeTi LDH at lower concentration (100% cell viability at 15.6 μg/ml). Overall, we offer a facile surfactant free method for the synthesis of NiFeTi LDH which is efficient for decontamination of anionic dyes from water and also non-toxic.

Co-Mn layered double hydroxide as an effective heterogeneous catalyst for degradation of organic dyes by activation of peroxymonosulfate

Chemosphere ◽  
2018 ◽  
Vol 204 ◽  
pp. 11-21 ◽  
Author(s):  
Xiufei Zhao ◽  
Chenggang Niu ◽  
Lei Zhang ◽  
Hai Guo ◽  
Xiaoju Wen ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Layered Double Hydroxide ◽  
Organic Dyes ◽  
Double Hydroxide

Simultaneous removal of phosphates and dyes by Al-doped iron oxide decorated MgAl layered double hydroxide nanoflakes

2019 ◽  
Vol 6 (8) ◽  
pp. 2615-2625 ◽  
Author(s):  
Shu Cheng ◽  
Luhua Shao ◽  
Jianhong Ma ◽  
Xinnian Xia ◽  
Yutang Liu ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Layered Double Hydroxide ◽  
Simultaneous Removal ◽  
Double Hydroxide

Study of the adsorption of phosphates, CR and MO in various systems by Al-doped iron oxide decorated MgAl layered double hydroxide nanoflakes.

Removal of Anionic Dyes from Water using Polyethylene Glycol Modified Ni‐Al‐layered Double Hydroxide Nanocomposites

2020 ◽  
Vol 5 (14) ◽  
pp. 4165-4174
Author(s):  
Subramanian Natarajan ◽  
Raghupandiyan Naresh ◽  
Viruthachalam Thiagarajan
Keyword(s):  
Polyethylene Glycol ◽  
Layered Double Hydroxide ◽  
Anionic Dyes ◽  
Double Hydroxide

Constrainment Effects of Interleaved Organic Molecules into Layered Double Hydroxides

2004 ◽  
Vol 847 ◽  
Author(s):  
Marc Dubois ◽  
El Mostafa Moujahid ◽  
Jean-Pierre Besse ◽  
Fabrice Leroux
Keyword(s):  
Layered Double Hydroxide ◽  
Hybrid Materials ◽  
Layered Double Hydroxides ◽  
Organic Molecules ◽  
Organic Dyes ◽  
Dye Molecules ◽  
Cation Composition ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Subsequent Stabilization

ABSTRACTIncorporation and subsequent stabilization of organic molecules into layered double hydroxide are investigated. Through two types of hybrid materials, organic dyes and aniline-based monomers interleaved between LDH materials of cation composition Zn2Al and Cu2Cr respectively, it is shown that the effect of the constrainment is revealed by the interactions different according to the molecule size and stacking as exemplified by dye molecules, orange 6 and green 25 acids and two aniline-based monomers, m-amino-4-benzenesulfonic and 3-aniline-1-propanesulfonic acids.

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