Magnetically recoverable mesoporous melamine–formaldehyde nanoparticles as an efficient adsorbent for hexavalent chromium removal

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 83788-83794 ◽  
Author(s):  
Zhongfei Lv ◽  
Dandan Zhao ◽  
Changsheng Liang ◽  
Jiayang Cui ◽  
Yangben Cai ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Heavy Metal Ions ◽  
High Surface ◽  
High Surface Area ◽  
Chromium Removal ◽  
Melamine Formaldehyde ◽  
Porous Nanoparticles ◽  
Specific Affinity ◽  
Efficient Adsorbent ◽  
Cr Removal

Functional porous nanoparticles have been considered as potential adsorbents for chromium (Cr) removal due to their unique properties such as high surface area, nanosized structure and specific affinity for heavy metal ions.

Electrospun hematite nanofiber/mesoporous silica core/shell nanomaterials as an efficient adsorbent for heavy metals

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90516-90525 ◽  
Author(s):  
Shani Egodawatte ◽  
Katherine E. Greenstein ◽  
Ivy Vance ◽  
Edris Rivera ◽  
Nosang V. Myung ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Ions ◽  
High Surface ◽  
High Surface Area ◽  
Core Shell ◽  
Functionalized Nanomaterials ◽  
Silica Core ◽  
Efficient Adsorbent ◽  
Global Water

Functionalized nanomaterials hold tremendous promise for water treatment because their high surface area makes them ideal sorbents for pollutants like heavy metal ions that are pervasive in global water supplies.

Hierarchical flowerlike magnesium oxide hollow spheres with extremely high surface area for adsorption and catalysis

2016 ◽  
Vol 4 (2) ◽  
pp. 400-406 ◽  
Author(s):  
Shuliang Yang ◽  
Peipei Huang ◽  
Li Peng ◽  
Changyan Cao ◽  
Yanan Zhu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Surface Area ◽  
Magnesium Oxide ◽  
Heavy Metal Ions ◽  
Catalytic Properties ◽  
Condensation Reaction ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Adsorption Properties

3D hierarchical flowerlike MgO hollow spheres with extremely high surface area showed excellent adsorption properties for heavy metal ions and catalytic properties for the Claisen–Schmidt condensation reaction.

Bio-inspired surface-functionalization of graphene oxide for the adsorption of organic dyes and heavy metal ions with a superhigh capacity

2014 ◽  
Vol 2 (14) ◽  
pp. 5034-5040 ◽  
Author(s):  
Zhihui Dong ◽  
Dong Wang ◽  
Xia Liu ◽  
Xianfeng Pei ◽  
Liwei Chen ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Synergistic Effect ◽  
Metal Ions ◽  
Surface Area ◽  
Surface Functionalization ◽  
Heavy Metal Ions ◽  
Organic Dyes ◽  
High Surface ◽  
High Surface Area

By utilizing the synergistic effect of poly-dopamine (PD) with functional groups and graphene oxide (GO) with a high surface area, a series of sub-nano thick PD layer coated GO (PD/GO) composites were fabricated and used for effectively decontaminating wastewater.

scholarly journals Preparation and Application of Bismuth/MXene Nano-Composite as Electrochemical Sensor for Heavy Metal Ions Detection

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 866 ◽  
Author(s):  
Ying He ◽  
Li Ma ◽  
Liya Zhou ◽  
Guanhua Liu ◽  
Yanjun Jiang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Surface Area ◽  
Heavy Metal Ions ◽  
High Surface ◽  
High Surface Area ◽  
Effective Surface ◽  
Nano Composite ◽  
Environmental Friendliness ◽  
Metal Ions Detection

A nano-form composite of MXenes (Ti3C2Tx, Tx = -O, -OH, -F) was synthesized through depositing bismuth-nanoparticle (BiNPs) onto Ti3C2Tx sheets. Because of the preventive effect of the two-dimensional layered structure of Ti3C2Tx, the nanoparticles of Bi were uniform and well attached on the Ti3C2Tx. The obtained BiNPs/Ti3C2Tx nano-composite was applied for sensors construction of electrochemical detecting of Pb2+ and Cd2+ heavy metal ions. The produced BiNPs@Ti3C2Tx-based sensor showed high effective surface area and excellent conductivity. Also, the BiNPs were efficient for anodic-stripping voltammetric to detect heavy metal ions. After conditions optimization, the BiNPs@Ti3C2Tx nano-sensor could detect Pb2+ and Cd2+ simultaneously and the detection limits were 10.8 nM for Pb2+ and 12.4 nM for Cd2+. The BiNPs@Ti3C2Tx was promising for detecting heavy metal ions due to their high surface area, fast electron-transfer ability, environmental friendliness, and facial preparation.

scholarly journals Functionalized Fe3O4 Nanoparticles as Glassy Carbon Electrode Modifiers for Heavy Metal Ions Detection—A Mini Review

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7725
Author(s):  
Amanda Kulpa-Koterwa ◽  
Tadeusz Ossowski ◽  
Paweł Niedziałkowski
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Environmental Remediation ◽  
Heavy Metal Ions ◽  
Anodic Stripping Voltammetry ◽  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Shell Nanoparticles ◽  
Practical Applications

Over the past few decades, nanoparticles of iron oxide Fe3O4 (magnetite) gained significant attention in both basic studies and many practical applications. Their unique properties such as superparamagnetism, low toxicity, synthesis simplicity, high surface area to volume ratio, simple separation methodology by an external magnetic field, and renewability are the reasons for their successful utilisation in environmental remediation, biomedical, and agricultural applications. Moreover, the magnetite surface modification enables the successful binding of various analytes. In this work, we discuss the usage of core–shell nanoparticles and nanocomposites based on Fe3O4 for the modification of the GC electrode surface. Furthermore, this review focuses on the heavy metal ions electrochemical detection using Fe3O4-based nanoparticles-modified electrodes. Moreover, the most frequently used electrochemical methods, such as differential pulse anodic stripping voltammetry and measurement conditions, including deposition potential, deposition time, and electrolyte selection, are discussed.

scholarly journals Adsorption of Hexavalent Chromium and Divalent Lead Ions on the Nitrogen-Enriched Chitosan-Based Activated Carbon

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1907
Author(s):  
Fatma Hussain Emamy ◽  
Ali Bumajdad ◽  
Jerzy P. Lukaszewicz
Keyword(s):  
Heavy Metal ◽  
Activated Carbon ◽  
Metal Ions ◽  
Metal Removal ◽  
High Surface ◽  
Heavy Metal Removal ◽  
High Surface Area ◽  
Kinetics Of Adsorption ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order

Optimizing the physicochemical properties of the chitosan-based activated carbon (Ch-ACs) can greatly enhance its performance toward heavy metal removal from contaminated water. Herein, Ch was converted into a high surface area (1556 m2/g) and porous (0.69 cm3/g) ACs with large content of nitrogen (~16 wt%) using K2CO3 activator and urea as nitrogen-enrichment agents. The prepared Ch-ACs were tested for the removal of Cr(VI) and Pb(II) at different pH, initial metal ions concentration, time, activated carbon dosage, and temperature. For Cr(VI), the best removal was at pH = 2, while for Pb(II) the best pH for its removal was in the range of 4–6. At 25 °C, the Temkin model gives the best fit for the adsorption of Cr(VI), while the Langmuir model was found to be better for Pb(II) ions. The kinetics of adsorption of both heavy metal ions were found to be well-fitted by a pseudo-second-order model. The findings show that the efficiency and the green properties (availability, recyclability, and cost effectiveness) of the developed adsorbent made it a good candidate for wastewaters treatment. As preliminary work, the prepared sorbent was also tested regarding the removal of heavy metals and other contaminations from real wastewater and the obtained results were found to be promising.

Robust transparent mesoporous silica membranes as matrices for colorimetric sensors

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16549-16553 ◽  
Author(s):  
Donghun Kim ◽  
Bradley F. Chmelka
Keyword(s):  
Heavy Metal ◽  
Mesoporous Silica ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Colorimetric Detection ◽  
High Surface ◽  
Silica Membranes ◽  
Surface Areas ◽  
Functionalized Mesoporous Silica ◽  
Colorimetric Sensors

Transparent functionalized mesoporous silica membranes have been prepared with high surface areas (∼500 m2 g−1) that exhibit high sensitivities for colorimetric detection and sensing of dilute heavy-metal ions (e.g., Pb2+).

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