Fe3O4/PANI/MnO2 core–shell hybrids as advanced adsorbents for heavy metal ions

2017 ◽  
Vol 5 (8) ◽  
pp. 4058-4066 ◽  
Author(s):  
Jian Zhang ◽  
Jie Han ◽  
Minggui Wang ◽  
Rong Guo
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Heavy Metal Ions ◽  
Core Shell ◽  
High Adsorption ◽  
Magnetic Adsorbents ◽  
Solution Route ◽  
High Adsorption Capacity

Multifunctional magnetic adsorbents of Fe3O4/PANI/MnO2 core–shell hybrids have been developed through a facile and economic solution route, which show high adsorption capacity toward heavy metal ions.

scholarly journals Preparation of PVDF/Hyperbranched-Nano-Palygorskite Composite Membrane for Efficient Removal of Heavy Metal Ions

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 156 ◽  
Author(s):  
Xiaoye Zhang ◽  
Yingxi Qin ◽  
Guifang Zhang ◽  
Yiping Zhao ◽  
Chao Lv ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Composite Membrane ◽  
Heavy Metal Ions ◽  
Thermo Gravimetric Analysis ◽  
Composite Membranes ◽  
Gravimetric Analysis ◽  
High Adsorption ◽  
High Adsorption Capacity

In this work, three kinds of hyperbranched polyamidoamine-palygorskite (PAMAM-Pal) were designed and synthesized by grafting the first generation polyamidoamine (G1.0 PAMAM), G2.0 PAMAM and G3.0 PAMAM onto Pal surfaces, respectively. Then, these PAMAM-Pals were used as additives to prepare polyvinylidene fluoride (PVDF)/hyperbranched polyamidoamine-palygorskite bicomponent composite membranes. The structures of the composite membranes were characterized by Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TEM), X-ray photoelectron spectroscopy (XPS), field-emission scanning electronmicroscopy (SEM), atomic force microscope (AFM) and Thermogravimetric analysis (TGA). The adsorption properties of composite membranes to heavy metal ions was studied, and the results found that the maximum adsorption capacities for Cu(II), Ni(II) and Cd(II) could reach 155.19 mg/g, 124.28 mg/g and 125.55 mg/g, respectively, for the PVDF/G3.0 PAMAM-Pal membrane, while only 23.70 mg/g, 17.74 mg/g and 14.87 mg/g could be obtained for unmodified membranes in the same conditions. The high adsorption capacity can be ascribed to the large number of amine-terminated groups, amide groups and carbonyl groups of the composite membrane. The above results indicated that the prepared composite membrane has a high adsorption capacity for heavy metal ions removal in water treatment.

Functionalized hollow MnFe2O4 nanospheres: design, applications and mechanism for efficient adsorption of heavy metal ions

2019 ◽  
Vol 43 (15) ◽  
pp. 5879-5889 ◽  
Author(s):  
Chengzhao Jin ◽  
Guixiang Teng ◽  
Yinan Gu ◽  
Hao Cheng ◽  
ShaoPeng Fu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Surface Activity ◽  
Heavy Metal Ions ◽  
Contaminated Water ◽  
High Porosity ◽  
Adsorption Efficiency ◽  
High Adsorption

A l-cysteine functionalized magnetic hollow MnFe2O4 nanosphere material has been synthesised, with high magnetism, large interior cavities, and high porosity and surface activity. It has high adsorption efficiency and regenerated adsorption capacity for the removal of Cr6+ and Pb2+ in contaminated water.

Preparation of amino-functionalized CoFe2O4@SiO2 magnetic nanocomposites for potential application in absorbing heavy metal ions

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72479-72486 ◽  
Author(s):  
Chunrong Ren ◽  
Xingeng Ding ◽  
Huiqin Fu ◽  
Cheng Meng ◽  
Wenqi Li ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Shell Structure ◽  
Potential Application ◽  
Heavy Metal Ions ◽  
Magnetic Nanocomposites ◽  
Core Shell ◽  
High Adsorption ◽  
High Adsorption Capacity ◽  
Core Shell Structure

The magnetic CoFe2O4@SiO2–NH2 particles with core-shell structure are designed and synthesized. They have high adsorption capacity (170.829 mg g−1), high removal efficiency (96.93%) for heavy metals, and can be recycled easily.

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.

Fabrication of Fe3O4@polydopamine@polyamidoamine core–shell nanocomposites and their application for Cu(ii) adsorption

2018 ◽  
Vol 42 (14) ◽  
pp. 12212-12221 ◽  
Author(s):  
Yukun Sun ◽  
Dongyun Li ◽  
Hui Yang ◽  
Xingzhong Guo
Keyword(s):  
Magnetic Properties ◽  
Adsorption Capacity ◽  
Core Shell ◽  
High Adsorption ◽  
High Adsorption Capacity

Fe3O4@PDA@PAMAM nanocomposites were fabricated with a polydopamine assisted method, possessing excellent magnetic properties and high adsorption capacity for Cu(ii).

Rapid capture of trace precious metals by amyloid-like protein membrane with high adsorption capacity and selectivity

2020 ◽  
Vol 8 (6) ◽  
pp. 3438-3449 ◽  
Author(s):  
Facui Yang ◽  
Zhigang Yan ◽  
Jian Zhao ◽  
Shuting Miao ◽  
Dong Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Adsorption Capacity ◽  
Precious Metal ◽  
Precious Metals ◽  
Bilayer Membrane ◽  
High Adsorption ◽  
Protein Membrane ◽  
High Adsorption Capacity ◽  
Precious Metal Ions

A protein-based bilayer membrane can selectively sequester precious metal ions from leaching solutions of ores and WEEE, and exhibits an adsorption capacity for gold of 1034.4 mg g−1.

Sign in / Sign up

Export Citation Format

Share Document