scholarly journals Mechanistic Insight of Biochar-layered Double Hydroxide Composite for Efficient Removal of Aqueous Pb(II) and Cu(II)

2021 ◽  
Author(s):  
Xinyue Su ◽  
Yan Chen ◽  
Yanfei Li ◽  
Jing Li ◽  
Wen Song ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Layered Double Hydroxide ◽  
Adsorption Process ◽  
Efficient Removal ◽  
Mineral Precipitation ◽  
Adsorption Mechanisms ◽  
Mechanistic Insight ◽  
Heavy Metal Wastewater ◽  
Pseudo Second Order ◽  
Double Hydroxide

Abstract To explore the heavy metal adsorption mechanisms by biochar-based materials, MgAl-layered double hydroxide (MgAl-LDH) was loaded on a commercial coconut shell biochar (BC) to obtain the composite (BC-LDH) for adsorptive decontamination of Pb(II) and Cu(II) in water. The removal capacities of BC-LDH (294 and 38.6 mg/g) was higher than BC (13.3 and 11.4 mg/g) and LDH (126 and 22.7 mg/g) for aqueous Pb(II) and Cu(II). The pseudo-second-order equation and the Langmuir model could better illustrate the adsorption process, respectively. The interaction mechanisms between BC-LDH and heavy metals were classified as mineral precipitation (Qpre), cation exchange and isomorphic replacement (Qexc), electrostatic attraction (Qele), and surface complexation (Qcom) according to the characterization results. The quantitative analysis indicated that the contributions of the above mechanisms of BC-LDH for Pb(II) and Cu(II) followed the order of Qpre > Qele > Qexc and Qpre > Qexc > Qele, respectively. Compared with BC, the Qpre increased and Qele decreased significantly, certified the combination of BC and LDH provided a kind of viable composite in heavy metal wastewater treatment.

scholarly journals Enhanced Removal of Sulfonated Lignite from Oil Wastewater with Multidimensional MgAl-LDH Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 861
Author(s):  
Ling Zhou ◽  
Michal Slaný ◽  
Bingbing Bai ◽  
Weichao Du ◽  
Chengtun Qu ◽  
...  
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Hydrothermal Condition ◽  
Adsorption Mechanisms ◽  
Initial Ph ◽  
Pseudo Second Order ◽  
Double Hydroxide ◽  
Oil Wastewater ◽  
Layered Double Hydroxide Nanoparticles

In this study, hierarchical MgAl-LDH (layered double hydroxide) nanoparticles with a flower-like morphology were prepared under a hydrothermal condition by employing worm-like micelles formed by cetyltrimethylammonium bromide (CTAB) and salicylic acid (SA) as templates. The morphology and structure of the materials were characterized by Brunauer–Emmett–Teller (BET), SEM, and XRD analyses. The performance for the adsorption of sulfonated lignite (SL) was also investigated in detail. FTIR was used to detect the presence of active functional groups and determine whether they play important roles in adsorption. The results showed that the hierarchical MgAl-LDH nanoparticles with a specific surface area of 126.31 m2/g possessed a flower-like morphology and meso–macroporous structures. The adsorption capacity was high—its value was 1014.20 mg/g at a temperature of 298 K and an initial pH = 7, which was higher than traditional MgAl-LDH (86 mg/g). The adsorption process of sulfonated lignite followed the pseudo-second-order kinetics model and conformed to Freundlich isotherm model with a spontaneous exothermic nature. In addition, the hierarchical MgAl-LDH could be regenerated and used, and the adsorption was high after three adsorption cycles. The main adsorption mechanisms were electrostatic attraction and ion exchange between the hierarchical MgAl-LDH and sulfonated lignite.

scholarly journals Efficient Removal of Methylene Blue by Adsorption Using Composite Based Ca/Al Layered Double Hydroxide-Biochar

2020 ◽  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Layered Double Hydroxide ◽  
Adsorption Process ◽  
Efficient Removal ◽  
X Ray ◽  
Edx Analyses ◽  
As Adsorption ◽  
Double Hydroxide

<p>Composite based Ca/Al layered double hydroxide and biochar was prepared using mixing coprecipitation method at pH 10. Composite and the starting materials was characterized using X-ray, FTIR, BET, thermal, and SEM-EDX analyses. Furthermore, composite was used as adsorbent of methylene blue from aqueous solution. Several factors that influencing the adsorption process was investigated such as adsorption time, initial concentration, and temperature adsorption. The performance of composite as adsorbent was evaluated by reusability process. The results showed that composite has diffraction peak at 9.82, 17.99, 19.86, 20.55, 29.32, 30.95, 32.65, 36.61, 37.00, 43.49, 47.15, 55.12, and 56.12 deg, which was based on diffraction of Ca/Al layered double hydroxide and biochar as starting materials. The surface area of composite was 158.291 m2/g and largely higher than starting materials. The morphology of composite also shows regularity shape than Ca/Al layered double hydroxide and biochar. Adsorption of methylene blue on composite showed that higher adsorption capacity (32.535 mg/g) than starting materials. The reusability of adsorbent showed that composite can be used several times ad adsorbent without loss adsorption capacity and these phenomena indicated composite is excellent material to remove dye from aqueous solution.</p>

scholarly journals Efficient Capture of Heavy Metal Ions and Arsenic with a CaY–Carbonate Layered Double-Hydroxide Nanosheet

ACS Omega ◽  
2021 ◽  
Author(s):  
Md. Hasan Zahir ◽  
Kashif Irshad ◽  
Mohammad Mizanur Rahman ◽  
M. Nasiruzzaman Shaikh ◽  
Mohammad Mominur Rahman
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Layered Double Hydroxide ◽  
Heavy Metal Ions ◽  
Double Hydroxide

A review on heavy metal ions adsorption from water by Layered Double Hydroxide and its composites

2021 ◽  
pp. 120099
Author(s):  
Xiaofang Feng ◽  
Runxuan Long ◽  
Lingling Wang ◽  
chenchen Liu ◽  
Zhongxiang Bai ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Layered Double Hydroxide ◽  
Heavy Metal Ions ◽  
Double Hydroxide
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