Simultaneous Adsorption of Heavy Metal and Organic Pollutant onto Citrate-Modified Layered Double Hydroxides with Dodecylbenzenesulfonate

2015 ◽  
Vol 32 (8) ◽  
pp. 666-675 ◽  
Author(s):  
Yan Li ◽  
Hao-Yu Bi ◽  
Xiao-Qin Shi
Keyword(s):  
Heavy Metal ◽  
Layered Double Hydroxides ◽  
Organic Pollutant ◽  
Simultaneous Adsorption ◽  
Double Hydroxides

scholarly journals Layered double hydroxides as amendment for remediation of heavy metal ions in water and soil

2021 ◽  
Vol 51 (5) ◽  
pp. 493-508
Author(s):  
Fangqi Mao ◽  
Peipei Hao ◽  
Xianggui Kong ◽  
Xiaodong Lei ◽  
Xue Duan
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Layered Double Hydroxides ◽  
Heavy Metal Ions ◽  
Double Hydroxides

Simultaneous adsorption of trace sulfamethoxazole and hexavalent chromium by biochar/MgAl layered double hydroxide composites

2019 ◽  
Vol 16 (1) ◽  
pp. 68 ◽  
Author(s):  
Guowan Li ◽  
Zhujian Huang ◽  
Chengyu Chen ◽  
Hongcan Cui ◽  
Yijuan Su ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Human Health ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Metal Species ◽  
Simultaneous Removal ◽  
Simultaneous Adsorption ◽  
Potential Risks ◽  
Double Hydroxide ◽  
Double Hydroxides

Environmental contextWater contamination by antibiotics and heavy metals entails potential risks to both the environment and human health. Composite materials based on MgAl-layered double hydroxides and biochar simultaneously adsorbed the toxic sulfamethoxazole and CrVI metal species. These findings indicate that biochar/metal hydroxide composites could be valuable adsorbents for the simultaneous removal of trace antibiotics and metals from water. AbstractWater contamination by antibiotics and heavy metals has drawn wide attention because of the potential risks it poses to both the environment and human health. In this study, a series of adsorbents was successfully synthesised based on MgAl-layered double hydroxides (LDHs) and biochar (BC) derived from Pennisetum sinese Roxb. The batch adsorption experiment results showed that the obtained composites could effectively adsorb trace sulfamethoxazole (SMX) and CrVIsimultaneously. The simultaneous adsorption of trace SMX and CrVI are well described by the pseudo-second-order kinetics and Freundlich isotherm models. Characterisation of the composites after adsorption showed that the composites adsorbed SMX mainly by π-π bonds, hydrophobic interactions and hydrogen bonds. Electrostatic interaction, anion exchange, intraparticle diffusion and hydrogen bonding are the main mechanisms for CrVI adsorption onto the composites. This study indicates that the biochar/MgAl layered double hydroxide composites are promising adsorbents for the simultaneous removal of trace antibiotics and CrVI.

A novel luminescence probe based on layered double hydroxides loaded with quantum dots for simultaneous detection of heavy metal ions in water

2017 ◽  
Vol 5 (20) ◽  
pp. 5024-5030 ◽  
Author(s):  
Jieyuan Liu ◽  
Guocheng Lv ◽  
Wenlong Gu ◽  
Zhaohui Li ◽  
Aiwei Tang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Quantum Dots ◽  
Layered Double Hydroxides ◽  
Luminescence Intensity ◽  
Heavy Metal Ions ◽  
Simultaneous Detection ◽  
Real Water Samples ◽  
Remarkable Improvement ◽  
Double Hydroxides

A remarkable improvement in luminescence intensity was achieved by immobilizing quantum dots on the surface of layered double hydroxides, for the detection of heavy metals in real water samples.

scholarly journals Reactivity and Heavy Metal Removal Capacity of Calcium Alginate Beads Loaded with Ca–Al Layered Double Hydroxides

2019 ◽  
Vol 3 (1) ◽  
pp. 22 ◽  
Author(s):  
Andres Borgiallo ◽  
Ricardo Rojas
Keyword(s):  
Heavy Metal ◽  
Layered Double Hydroxides ◽  
Calcium Alginate ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Alginate Beads ◽  
Buffering Capacity ◽  
Uptake Capacity ◽  
Removal Capacity ◽  
Double Hydroxides

Layered double hydroxides (LDHs) present multiple applications due to their versatility and reactivity. Thus, Ca–Al LDHs with Friedel’s salt structure (HC) have been proposed as heavy metal scavengers due to their buffering capacity at basic pHs. Nevertheless, the control of the reactivity of LDHs such as HC is necessary to optimize their applications. Here, the reactivity of an HC prepared by a coprecipitation method was modified by its inclusion in calcium alginate (CaAlg) beads prepared by ionic gelation. The obtained beads (CaAlg/HC) showed good dispersion of the HC particles in the alginate matrix and were used to test the acid base reactivity and heavy metal uptake capacity compared with pure CaAlg beads and HC powder separately. The pH buffering capacity of CaAlg beads was enriched by the inclusion of HC that, in turn, was modulated in its reactivity. Thus, the HC dissolution times changed from mere seconds for the powder to tens of minutes when enclosed in the beads in a kinetic profile determined by the diffusive step. On the other hand, Cu2+ uptake capacity of CaAlg/HC beads combined the Cu(OH)2 precipitation capacity of HC with the complexation capacity of alginate, reaching good affinity and capacity for the obtained beads. Nevertheless, the precipitation of the hydroxide was produced outside the bead, which would induce the addition of an additional separation step to produce an acceptable Cu2+ elimination.

Organo-montmorillonites for efficient and rapid water remediation: sequential and simultaneous adsorption of lead and bisphenol A

2018 ◽  
Vol 15 (5) ◽  
pp. 286 ◽  
Author(s):  
Chongmin Liu ◽  
Pingxiao Wu ◽  
Lytuong Tran ◽  
Nengwu Zhu ◽  
Zhi Dang
Keyword(s):  
Heavy Metal ◽  
Bisphenol A ◽  
Photoelectron Spectroscopy ◽  
Organic Pollutant ◽  
Water Remediation ◽  
Lead Ion ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Simultaneous Adsorption ◽  
Sequential Adsorption

Environmental contextNovel materials are increasingly being sought-after to remove metals and organic pollutants from water. We investigated two organo-functionalised montmorillonites for sequential and simultaneous adsorption of lead and bisphenol A. Our findings could lead to new approaches for handling emergency complex pollution events. AbstractOrgano-montmorillonites (OMts) modified by two different carbon chain lengths of betaine were used to remove the combined pollution (heavy metal and organic pollutant) from a water environment, sequentially and simultaneously. The properties of OMts were measured with X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetry-Differential Scanning Calorimetry (TG-DSC). The independent adsorption of a single pollutant, direct sequential adsorption, indirect sequential adsorption and simultaneous adsorption of bisphenol A (BPA) and lead ion (Pb2+) onto OMts were investigated. Initial concentrations, reaction time, solution pH and the release amount of pre-adsorbed contaminant in the sequential sorption system were also investigated for the adsorption behaviours of Pb2+ and BPA. Two kinetic models and two adsorption isotherms were applied to explain the adsorption process. The adsorptive mechanism of BPA adsorption onto OMts was ascribed to a hydrophobic interaction, while the mechanism for Pb2+ adsorption was attributed to cation exchange, surface adsorption, electrostatic attraction and complexation from the results of specific surface area Brunauer–Emmett–Teller (BET) and X-ray photoelectron spectroscopy (XPS). This study might provide valuable information for the application of novel organoclays to the removal of both heavy metal and organics from water.

Synergistic coagulation of GO and secondary adsorption of heavy metal ions on Ca/Al layered double hydroxides

2017 ◽  
Vol 229 ◽  
pp. 827-836 ◽  
Author(s):  
Wen Yao ◽  
Jian Wang ◽  
Pengyi Wang ◽  
Xiangxue Wang ◽  
Shujun Yu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Layered Double Hydroxides ◽  
Heavy Metal Ions ◽  
Double Hydroxides
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