scholarly journals Highly Porous Hydroxyapatite/Graphene Oxide/Chitosan Beads as an Efficient Adsorbent for Dyes and Heavy Metal Ions Removal

Molecules ◽  
2021 ◽  
Vol 26 (20) ◽  
pp. 6127
Author(s):  
Nguyen Van Hoa ◽  
Nguyen Cong Minh ◽  
Hoang Ngoc Cuong ◽  
Pham Anh Dat ◽  
Pham Viet Nam ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Metal Ion ◽  
Copper Ions ◽  
High Porosity ◽  
Step Method ◽  
Sem Images ◽  
Chitosan Beads ◽  
Porous Hydroxyapatite ◽  
Highly Porous

Dye and heavy metal contaminants are mainly aquatic pollutants. Although many materials and methods have been developed to remove these pollutants from water, effective and cheap materials and methods are still challenging. In this study, highly porous hydroxyapatite/graphene oxide/chitosan beads (HGC) were prepared by a facile one-step method and investigated as efficient adsorbents. The prepared beads showed a high porosity and low bulk density. SEM images indicated that the hydroxyapatite (HA) nanoparticles and graphene oxide (GO) nanosheets were well dispersed on the CTS matrix. FT-IR spectra confirmed good incorporation of the three components. The adsorption behavior of the obtained beads to methylene blue (MB) and copper ions was investigated, including the effect of the contact time, pH medium, dye/metal ion initial concentration, and recycle ability. The HGC beads showed rapid adsorption, high capacity, and easy separation and reused due to the porous characteristics of GO sheets and HA nanoparticles as well as the rich negative charges of the chitosan (CTS) matrix. The maximum sorption capacities of the HGC beads were 99.00 and 256.41 mg g−1 for MB and copper ions removal, respectively.

Mechanism study of metal ion adsorption on porous hydroxyapatite: experiments and modeling

2020 ◽  
Vol 98 (2) ◽  
pp. 79-89 ◽  
Author(s):  
Amina Ramdani ◽  
Zoubida Taleb ◽  
Abdelkrim Guendouzi ◽  
Abdelkader Kadeche ◽  
Hayat Herbache ◽  
...  
Keyword(s):  
Metal Ion ◽  
Density Functional ◽  
Copper Ions ◽  
Physical Adsorption ◽  
Average Particle Size ◽  
Average Particle ◽  
Ftir Analysis ◽  
Solution Ph ◽  
Sem Images ◽  
Porous Hydroxyapatite

In this study, low-cost biomaterial hydroxyapatite (N-Hap) prepared from bovine bones was tested for its potential to sorb copper Cu2+ and Fe3+ from aqueous solution and was compared with commercial hydroxyapatite (C-Hap). The structural characterization of N-Hap and C-Hap were carried out by Fourier transform infrared (FTIR) analysis, textural analysis (BET), morphology, and elemental analysis via scanning electron microscopy (SEM-EDX). The results obtained show that SEM images confirmed the formation of porous N-Hap with various morphologies and the average particle size ranges from 50 to 100 nm and the CaP ratio is 1.657. The presence of functional groups on N-Hap surface was confirmed by FTIR analysis. The specific surface areas of N-Hap and C-Hap are found to be 46.87 and 40.98 m2/g, respectively. Adsorption of two metals Cu2+ and Fe3+ was fast, with equilibrium attained within 30 min. Copper ions exhibited the greatest adsorption on both adsorbents because of their size and pH conditions. Metallic ion removal efficiency was favored at a slightly acidic solution pH and low temperature. The equilibrium and kinetic data were found to fit well the Langmuir model and the pseudo second order model with intraparticle diffusion. Thermodynamic parameters (ΔHads < 0 and ΔGads < 0) involved the exothermic, spontaneous, and physical adsorption process. The adsorption interaction of Cu2+ and Fe3+ with Hap surface was investigated by theoretical density functional theory (DFT) calculations. Therefore, the porous hydroxyapatite N-Hap displays potential as a new biocompatible adsorbent, and its use seems to be an interesting solution for the treatment of industrial wastewater.

Study on Heavy Metal Ion Adsorption of PAN-Amidoxime Nanofiber Nonwoven Material

2014 ◽  
Vol 1033-1034 ◽  
pp. 1072-1076 ◽  
Author(s):  
Zong Jie Li ◽  
Yu Hao Ma ◽  
Min Hu ◽  
Wei Min Kang ◽  
Bo Wen Cheng
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Copper Ions ◽  
Nonwoven Material ◽  
Ion Adsorption ◽  
Metal Ion Adsorption ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Ft Ir ◽  
Scanning Electron

In this study, polyacrylonitrile-amidoxime nanofibers were prepared by combining the technique of electrospinning and chemical modification with hydroxylamine chloride. Before modified the Polyacrylonitrile (PAN) nanofibers were bonded with two layers Ethylene-Propylene Side By Side (ES) thermal bonded nonwovens to improve its mechanical strength. Subsequently, they were applied to adsorb copper ions. The results of FT-IR spectra and scanning electron microscope indicated that nitrile groups in PAN were partly converted into amidoxime groups and there were no serious cracks on the surface of PAN-amidoxime nanofibers. The adsorption data of Cu (II) ions was fitted roughly with the Langmuir isotherm. The maximal adsorption capacities of Cu (II) ions reached 176 mg/g.

Few-Layered Graphene Oxide Nanosheets As Superior Sorbents for Heavy Metal Ion Pollution Management

2011 ◽  
Vol 45 (24) ◽  
pp. 10454-10462 ◽  
Author(s):  
Guixia Zhao ◽  
Jiaxing Li ◽  
Xuemei Ren ◽  
Changlun Chen ◽  
Xiangke Wang
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Metal Ion ◽  
Heavy Metal Ion ◽  
Graphene Oxide Nanosheets ◽  
Pollution Management

scholarly journals Graphene oxide-branched polyethylenimine foams for efficient removal of toxic cations from water

2018 ◽  
Vol 6 (20) ◽  
pp. 9384-9390 ◽  
Author(s):  
Dawid Pakulski ◽  
Włodzimierz Czepa ◽  
Samanta Witomska ◽  
Alessandro Aliprandi ◽  
Piotr Pawluć ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Efficient Removal ◽  
Branched Polyethylenimine ◽  
Highly Porous

Highly porous foams based on graphene oxide functionalized with branched polyethylenimine are generated and used with unprecedented efficiency for adsorbing heavy metal ions.

Regularities and mechanism of heavy metal cations sorption and (or) proton desorption by chitosan from aqueous solutions

2019 ◽  
Vol 97 (8) ◽  
pp. 621-628 ◽  
Author(s):  
T.E. Nikiforova ◽  
V.A. Kozlov ◽  
M.K. Islyaikin
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Metal Cations ◽  
Batch Adsorption ◽  
Amino Groups ◽  
Acidic Media ◽  
Chitosan Beads

The sorption process of heavy metal ions from aqueous solutions using chitosan flakes and chitosan beads was studied. Chitosan gel beads were prepared using covalent crosslinking of chitosan chains by epichlorohydrin with ionic gelation by sodium tripolyphosphate. The capability of chitosan beads to absorb the heavy metal ions from aqueous solutions was studied, and the physicochemical characteristics of the sorbent were evaluated using SEM and FTIR on the model solution treatment. It was found that competitive proton sorption takes place in acidic media, which results in a transformation of amino groups into inactive ammonium-salt form and decreases in heavy metal sorption onto chitosan from aqueous acidic media. Batch adsorption experiments were performed to examine the influence of various factors such as the initial concentration of metal salts, pH, and agitation duration on the process. It was established that metal ion sorption is pH dependent and has an optimum effect at a pH of 6.0. Following the Langmuir equation, the maximum sorption of Cu2+ions is estimated to be 1,6 mol/kg of modified chitosan. The kinetic study revealed that the adsorption kinetics are well-fitted to the kinetic equation of pseudo second order. Thus, sorption of heavy metal ions by chitosan is considered to be a competitive process that occurs on amino groups of the sorbent with equivalent coordinated participation of metal cations, protons, and anions.

Preparation of submicron ion-exchange fibers and application in copper ions removal from aqueous solutions

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Shuqin Feng ◽  
Xinyuan Shen
Keyword(s):  
Ion Exchange ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Removal Rate ◽  
Toxic Metal ◽  
Adsorption Rate ◽  
Maximum Adsorption Capacity ◽  
High Porosity ◽  
Spectroscopy Analysis ◽  
Sem Images

AbstractThe submicron ion-exchange fibers (IEF) of polystyrene (PS) and styrene-isoprene-styrene block copolymer (SIS) blends (80/20, w/w) obtained by electrospinning technology were further sulfonated with sulfuric acid to produce strong acidic cation ion exchange fibers. Scanning electron microscopy (SEM) images showed that there were obvious increase in the diameters, scratches, cracks, and micro-pores on the rough IEF surface. Fourier transform infrared (FTIR) spectroscopy analysis showed there were many sulfonated acid groups introduced onto the benzene wreath of styrene. The maximum adsorption capacity and the adsorption rate of copper ions were carried out and their removal rate determined by spectrophotometry. The results of the adsorption for copper ions showed that submicron IEF from PS/SIS blends with a high porosity (85%) and a high specific surface (760 m2/g) possess a rapid adsorption rate and a high ion adsorption amount (305.9 mmg/g). This high adsorption capacity suggests that the IEF can be efficiently applied to filter out toxic metal ions, and has excellent efficiency to remove copper ions from aqueous solution.

scholarly journals Instantaneous integration of magnetite nanoparticles on graphene oxide assisted by ultrasound for efficient heavy metal ion retrieval

2020 ◽  
Vol 64 ◽  
pp. 104962 ◽  
Author(s):  
Jeseung Yoo ◽  
Hyo-Sun Kim ◽  
Sang-Yul Park ◽  
Suyong Kwon ◽  
Joohyun Lee ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Graphene Oxide ◽  
Magnetite Nanoparticles ◽  
Metal Ion ◽  
Heavy Metal Ion
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