scholarly journals Preparation of NH2-Functionalized Fe2O3 and Its Chitosan Composites for the Removal of Heavy Metal Ions

2019 ◽  
Vol 11 (19) ◽  
pp. 5186 ◽  
Author(s):  
Jing Qian ◽  
Tianjiao Yang ◽  
Weiping Zhang ◽  
Yuchen Lei ◽  
Chengli Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
One Pot ◽  
Metal Ion Adsorption

NH2-Fe2O3 and NH2-Fe2O3/chitosan (NH2-Fe2O3/CS) with excellent physical properties and high adsorption capacities for several heavy metal ions were synthesized using a one-pot hydrothermal method. The materials were characterized by scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Physicochemical properties were determined by the Fourier transform infrared spectra (FTIR) and nitrogen adsorption analysis (Brunauer–Emmett–Teller (BET) method). The results of the characterization studies show that the material is uniformly dispersed and has good crystallinity and well-defined porous particles. The material is mesoporous, and the particles have a specific surface area of 55.41–233.03 m2·g−1, a total pore volume of 0.24–0.54 cm3·g−1, and a diameter of 3.83–17.56 nm. Additional results demonstrate that NH2-Fe2O3 and NH2-Fe2O3/CS are effective adsorbents for the removal of heavy metal ions from solution. In a ternary system, the order of their selective adsorption was determined to be Pb(II) > Cu(II) > Cd(II), and the adsorption rate of Pb(II) was much higher than that of Cu(II) and Cd (II). The metal ion adsorption capacity of NH2-Fe2O3 and NH2-Fe2O3/CS makes them promising adsorbents for wastewater cleanup.

Functional group effect of isoreticular metal–organic frameworks on heavy metal ion adsorption

2018 ◽  
Vol 42 (11) ◽  
pp. 8864-8873 ◽  
Author(s):  
Leili Esrafili ◽  
Vahid Safarifard ◽  
Elham Tahmasebi ◽  
M. D. Esrafili ◽  
Ali Morsali
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Functional Group ◽  
Metal Organic Frameworks ◽  
Ion Adsorption ◽  
Group Effect ◽  
Metal Ion Adsorption ◽  
Metal Organic

We examined adsorption behavior of some MOFs having different functional groups in their pillar structures for adsorption of some heavy metal ions.

scholarly journals Removal of heavy metal ions from wastewater by capacitive deionization using polypyrrole/chitosan composite electrode

2019 ◽  
Vol 37 (3-4) ◽  
pp. 205-216 ◽  
Author(s):  
Yujie Zhang ◽  
Quanqin Xue ◽  
Fei Li ◽  
Jizhe Dai
Keyword(s):  
Heavy Metal ◽  
Composite Material ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Composite Electrode ◽  
Capacitive Deionization ◽  
Metal Ion Adsorption ◽  
Adsorption Desorption ◽  
Chitosan Composite

A polypyrrole/chitosan composite material was obtained by chemical polymerization. The adsorption performance of a hot-molded polypyrrole/chitosan composite electrode was tested by adsorption/desorption experiments. Scanning electron microscopy and Fourier-transform infrared spectroscopy both showed the deposition of polypyrrole on the chitosan surface. The specific capacitance of the polypyrrole/chitosan composite was determined by cyclic voltammetry in 1.0 M KCl at 0.01 V/s as 102.96 F/g. The adsorption/desorption experiments indicated that the specific adsorption capacity of the composite for Cu2+ was 99.67 mg/g, while the removal performance for other metal ions, such as Ag+, Pb2+, and Cd2+, was good. The results of multicycle adsorption/desorption tests showed that the adsorption rate of the polypyrrole/chitosan composite electrode for Cu2+ was decreased from 56.4 to 51.4% over 10 cycles, demonstrating the stable metal-ion adsorption/desorption behavior of the composite electrode. The obtained performances show that the prepared polypyrrole/chitosan composite material is an ideal electrode material for the removal of heavy metal ions.

Synthesis, characterization, and highly acid-resistant properties of crosslinking β-chitosan with polyamines for heavy metal ion adsorption

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104754-104762 ◽  
Author(s):  
Ming-Tsung Wu ◽  
Yen-Ling Tsai ◽  
Chih-Wei Chiu ◽  
Chih-Chia Cheng
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Ion Adsorption ◽  
Adsorption Characteristics ◽  
Metal Ion Adsorption ◽  
Acidic Environments

A novel crosslinking modification of β-chitosan and successfully analyzed its fast adsorption characteristics for different heavy metal ions in highly acidic environments.

scholarly journals Using amine-functionalized magnetite hollow nanospheres (AMHNs) as adsorbents for heavy metal ions

2017 ◽  
Vol 76 (2) ◽  
pp. 452-458 ◽  
Author(s):  
Sen Lin ◽  
Lili Liu ◽  
Yong Yang ◽  
Wei Zhang ◽  
Meng Xu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ph Value ◽  
Hollow Nanospheres ◽  
One Pot ◽  
Amine Functionalized ◽  
Physicochemical Features ◽  
Kinetics And Isotherms

In this paper, the amine-functionalized magnetite hollow nanospheres (AMHNs), prepared through a facile one-pot synthesis, were used as heavy metal ion adsorbents, whose morphology and physicochemical features were exploring by transmission electron microscopy, vibrating sample magnetometer, X-ray diffraction and Fourier-transform infrared analyses. Its adsorption performances for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were studied in detail. The adsorption increased with the increase of initial pH value of the solution and could be obviously affected by ionic strength. Also, the adsorption kinetics and isotherms were studied. The adsorption processes for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ could all reach equilibrium in 60 min and be described well by the Langmuir thermodynamics model. The saturated adsorption capacities for Pb2+, Cu2+, Zn2+, Ni2+ and Cd2+ were 0.66, 0.47, 0.45, 0.38 and 0.26 mmol/g, respectively. In addition, the competitive adsorption showed the AMHNs had higher affinity to Pb2+ than to other heavy metal ions.

Adsorption Properties for Superabsorbent of Inverse Suspension Polymerization Poly(acrylate-Co-Acrylamide)

2011 ◽  
Vol 239-242 ◽  
pp. 851-854 ◽  
Author(s):  
Jian Jun Xie ◽  
Na Li ◽  
Kai Huang ◽  
Xin Qiang Han
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Selective Adsorption ◽  
Suspension Polymerization ◽  
Polymer Network ◽  
Adsorption Properties ◽  
Ph Values ◽  
Inverse Suspension Polymerization

Superabsorbent polymers are lightly crosslinked, hydrophilic polymer network having many functional groups. The adsorption properties in heavy metal ion solutions using poly(acrylate-co-acrylamide)(PAAM) are investigated. It is found that PAAM has a high uptake to heavy metal ions, and that the adsorption of heavy metal ions is greatly influenced by pH and the initial solution concentrations. The biggest and the smallest amount of adsorption are Cu2+and Cr3+in CuCl2and CrCl3solution, respectively. It was feasible for selective adsorption of the metal ions in the solution onto PAAM hydrogel by controlling the pH values of the mixing solution for CuCl2, FeCl3, CrCl3.Langmiur equatiom can satisfactorily fit for the adsorption of Cu2+while not fit for that of Fe3+and Cr3+.

Multi-optical signal channel gold nanoclusters and their application in heavy metal ions sensing arrays

2021 ◽  
Author(s):  
Yunyun Gui ◽  
Yihe Wang ◽  
Chiyang He ◽  
Zhouqing Tan ◽  
Lingfeng Gao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Gold Nanoclusters ◽  
Optical Signal ◽  
Heavy Metal Ion ◽  
One Pot ◽  
Signal Channel

Novel multi-optical signal channel gold nanoclusters (MS-AuNCs) with CL and FL properties were designed and prepared by a one-pot method. Then the CL and FL spectra of MS-AuNCs were applied to the sensing array for heavy metal ion differentiation.

scholarly journals Ag-Functionalized Si Nanowire Arrays Aligned Vertically for SERS Detection of Captured Heavy Metal Ions by BSA

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 685
Author(s):  
Ai-Huei Chiou ◽  
Jun-Luo Wei ◽  
Ssu-Han Chen
Keyword(s):  
Heavy Metal ◽  
Raman Scattering ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Great Promise ◽  
Ag Nps ◽  
Water Contact ◽  
Oh Groups ◽  
Si Nanowire

A novel surface-enhanced Raman scattering (SERS)-based probe to capture heavy metal ion (Zn2+) by bovine serum albumin (BSA) using Si-nanowire (SiNW) arrays with silver nanoparticles (AgNPs) was developed. A layer with AgNPs was deposited on the SiNW surface by RF magnetron sputtering for enhancement of SERS signals. Using a high-resolution transmission electron microscope (HRTEM), the observation reveals that the AgNP layer with depths of 30–75 nm was successfully deposited on SiNW arrays. The Ag peaks in EDS and XRD spectra of SiNW arrays confirmed the presence of Ag particles on SiNW arrays. The WCA observations showed a high affinity of the Ag–SiNW arrays immobilized with BSA (water contact angle (WCA) = 87.1°) and ZnSO4 (WCA = 8.8°). The results of FTIR analysis illustrate that the conjugate bonds exist between zinc sulfate (ZnSO4) and –OH groups/–NH groups of BSA. The resulting SiNWs/Ag NPs composite interfaces showed large Raman scattering enhancement for the capture of heavy metal ions by BSA with a detection of 0.1 μM. BSA and ZnSO4 conjugations, illustrating specific SERS spectra with high sensitivity, which suggests great promise in developing label-free biosensors.

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.

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