scholarly journals The selective adsorption performance and mechanism of multiwall magnetic carbon nanotubes for heavy metals in wastewater

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhongbing Wang ◽  
Wenbin Xu ◽  
Fanghui Jie ◽  
Zongwen Zhao ◽  
Kai Zhou ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Selective Adsorption ◽  
Efficient Treatment ◽  
New Type ◽  
Recyclable Adsorbent ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

AbstractThe safe treatment of heavy metals in wastewater is directly related to human health and social development. In this paper, a new type of recyclable adsorbent is synthesized through the oxidation of enhancer and modification with magnetic nanoparticles. The new adsorbent not only inherits the advantages of multiwall carbon nanotubes (6O-MWCNTs), but also exhibits a new magnetic property and further improved adsorption capacity, which is conducive to the magnetic separation and recovery of heavy metals. The adsorption results indicate that multiwall magnetic carbon nanotubes (6O-MWCNTs@Fe3O4) have a good performance for Pb(II) selective adsorption, with a maximum adsorption capacity of 215.05 mg/g, much higher than the existing adsorption capacity of the same type of adsorbents. Under the action of an external magnetic field, 6O-MWCNTs@Fe3O4 that adsorbed metal ions can quickly achieve good separation from the solution. The joint characterization results of FTIR and XPS show that under the action of both coordination and electrostatic attraction, the C=O bond in the –COOH group is induced to open by the metal ions and transforms into an ionic bond, and the metal ions are stably adsorbed on the surface of 6O-MWCNTs@Fe3O4. Pb(II) has a stronger attraction than Cu(II) and Cd(II) to the lone pair of electrons in oxygen atoms to form complexes, due to the covalent index of Pb (6.41) is more larger than that of Cu (2.98) and Cd (2.71).These data provide a new type of recyclable adsorbent for the efficient treatment of heavy metal ions in wastewater and enrich relevant theoretical knowledge.

scholarly journals Simultaneous capture of methyl orange and chromium(vi) from complex wastewater using polyethylenimine cation decorated magnetic carbon nanotubes as a recyclable adsorbent

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 4722-4734 ◽  
Author(s):  
Bo Chen ◽  
Wenli Yue ◽  
Huinan Zhao ◽  
Fengxia Long ◽  
Yangrui Cao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Methyl Orange ◽  
Chromium Vi ◽  
Recyclable Adsorbent ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

An MWCNTs@Fe3O4/PEI composite was facilely fabricated as a robust adsorbent for simultaneously capturing methyl orange (MO) and Cr(vi) from complex wastewater.

scholarly journals An efficient method for removal of pentachlorophenol using adsorption and microwave regeneration with different magnetic carbon nanotubes

2020 ◽  
Vol 81 (3) ◽  
pp. 585-595 ◽  
Author(s):  
Xue Zhang ◽  
Chunyue Cui ◽  
Ying Wang ◽  
Jing Chang ◽  
Dong Ma ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Irradiation ◽  
Adsorption Capacity ◽  
X Ray Diffraction ◽  
Chlorinated Organic Compounds ◽  
Transmission Electron ◽  
Microwave Regeneration ◽  
Chlorinated Organic ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

Abstract Various magnetic carbon nanotubes (CNTs) Co0.5M0.5Fe2O4-CNTs (M = Cu, Mn, Ni, Zn) were successfully prepared and applied for treatment of pentachlorophenol (PCP) with adsorption and microwave irradiation process. The Co0.5M0.5Fe2O4-CNTs were characterized by transmission electron microscopy, X-ray diffraction, vibrating sample magnetometry, and microwave absorption spectroscopy. The adsorption experiment results showed the adsorption capacity for PCP was in the following order: Co0.5Cu0.5Fe2O4-CNTs > Co0.5Mn0.5Fe2O4-CNTs > Co0.5Ni0.5Fe2O4-CNTs > Co0.5Zn0.5Fe2O4-CNTs. After adsorption, the Co0.5M0.5Fe2O4-CNTs was separated by magnetic field and regenerated by microwave irradiation at 850 W for 180 s. It was confirmed that after six adsorption and microwave regeneration cycles, the regeneration efficiency maintained over 90%. In particular, Co0.5Cu0.5Fe2O4-CNTs exhibited excellent adsorption capacity and reusability. These results can open a new avenue for treatment of chlorinated organic compounds with efficiently and non-secondary pollution.

A comprehensive review on magnetic carbon nanotubes and carbon nanotube-based buckypaper for removal of heavy metals and dyes

2021 ◽  
Vol 413 ◽  
pp. 125375 ◽  
Author(s):  
Fahad Saleem Ahmed Khan ◽  
Nabisab Mujawar Mubarak ◽  
Yie Hua Tan ◽  
Mohammad Khalid ◽  
Rama Rao Karri ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Comprehensive Review ◽  
Removal Of Heavy Metals ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

scholarly journals Effects of Electronegativity and Hydration Energy on the Selective Adsorption of Heavy Metal Ions by Synthetic NaX Zeolite

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4066
Author(s):  
Xianyuan Fan ◽  
Hong Liu ◽  
Emmanuella Anang ◽  
Dajun Ren
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Heavy Metal Ions ◽  
Binary Systems ◽  
Adsorption Mechanism ◽  
Selective Adsorption ◽  
Hydration Energy ◽  
Nax Zeolite ◽  
High Electronegativity

The adsorption capacity of synthetic NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ in single and multi-component systems were investigated. The effects of electronegativity and hydration energy on the selective adsorption, as well as potential selective adsorption mechanism of the NaX zeolite for Pb2+, Cd2+, Cu2+ and Zn2+ were also discussed. The maximum adsorption capacity order of the heavy metals in the single system was Pb2+ > Cd2+ > Cu2+ > Zn2+, and this could be related to their hydration energy and electronegativity. The values of the separation factors (α) and affinity constant (KEL) in different binary systems indicated that Pb2+ was preferentially adsorbed, and Zn2+ presented the lowest affinity for NaX zeolite. The selective adsorption capacities of the metals were in the order, Pb2+ > Cd2+ ≈ Cu2+ > Zn2+. The trend for the selective adsorption of NaX zeolite in ternary and quaternary systems was consistent with that in the binary systems. Pb2+ and Cu2+ reduced the stability of the Si-O-Al bonds and the double six-membered rings in the NaX framework, due to the high electronegativity of Pb2+ and Cu2+ than that of Al3+. The selective adsorption mechanism of NaX zeolite for the high electronegative metal ions could mainly result from the negatively charged O in the Si-O-Al structure of the NaX zeolite, hence heavy metal ions with high electronegativity display a strong affinity for the electron cloud of the oxygen atoms in the Si-O-Al. This study could evaluate the application and efficiency of zeolite in separating and recovering certain metal ions from industrial wastewater.

In-situ growth of ZIF-8 on gold nanoparticles/magnetic carbon nanotubes for electrochemical detection of bisphenol A

2021 ◽  
Author(s):  
Hexiang Li ◽  
Fawei Zhu ◽  
Jun Xiang ◽  
Fangbin Wang ◽  
Qi Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Bisphenol A ◽  
Electrochemical Detection ◽  
Metal Organic Frameworks ◽  
In Situ Growth ◽  
Metal Organic ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

We herein report a facile and scalable strategy for fabrication of the metal organic frameworks (MOFs) based composite by in-situ growing ZIF-8 on the gold nanoparticles (AuNPs) loaded magnetic carbon...

Thiol-functionalized magnetic carbon nanotubes for magnetic micro-solid phase extraction of sulfonamide antibiotics from milks and commercial chicken meat products

2019 ◽  
Vol 276 ◽  
pp. 458-466 ◽  
Author(s):  
Ainiyatul Nadiah Mohamad Nasir ◽  
Noorfatimah Yahaya ◽  
Nur Nadhirah Mohamad Zain ◽  
Vuanghao Lim ◽  
Sazlinda Kamaruzaman ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Meat Products ◽  
Chicken Meat ◽  
Phase Extraction ◽  
Sulfonamide Antibiotics ◽  
Commercial Chicken ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes
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