Role of nanomaterials as adsorbents in heavy metal ion removal from waste water: A review

Wadhawan, Shweta; Jain, Ashay; Nayyar, Jasamrit; Mehta, S.K.

doi:10.1016/j.jwpe.2019.101038

Cited by 382 publications

(158 citation statements)

References 103 publications

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“…40 . However, the reduced removal capacity in higher dosage could be due to inter-particle aggregation, overlapping of adsorption sites, and consequently, less active surface area 15,41 .…”

Section: Effects Of Sn/fe Mass Ratiomentioning

confidence: 99%

Preparation and Characterization of Nano-galvanic Bimetallic Fe/Sn Nanoparticles Deposited on Talc and its Enhanced Performance in Cr(VI) Removal

Bayat

Nasernejad

Falamaki

2021

Preprint

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In this study, talc-supported nano-galvanic nZVI/Sn bimetallic particles was successfully synthesized and utilized for Cr(VI) remediation. Talc-nZVI/Sn nanoparticles were characterized by SEM, EDS, FTIR, XRD, zeta potential, and BET analysis. The findings verified the uniform dispersion of nZVI/Sn nanoparticles on talc surface. The formation of numerous nano-galvanic cells between nZVI core and Sn shell enhanced the potential of bimetallic particles in Cr(VI) mitigation. Batch experiments were carried out to investigate optimum conditions and total Cr(VI) removal was achieved in 20 minutes using Sn/Fe mass ratio of 6/1, the adsorbent dosage of 2 g/L, initial Cr(VI) concentration of 80 mg/L, at the acidic environment (pH=5) and temperature of 303 K. Besides, co-existing of metallic cations turned out to facilitate the electron transfer from the nano-galvanic couple of NZVI/Sn and suggested the revolution of bimetallic particles to trimetallic composites. The aging study of the nanocomposite confirmed its constant high activity during 60 days. The removal reaction was well described by the pseudo-second-order kinetic and the Langmuir isotherm models. Overall, due to the synergistic galvanic cell effect of nZVI/Sn nanoparticles and full coverage of active sites by Sn layer, Talc-nZVI/6Sn was utilized as a promising nanocomposite for fast and highly efficient Cr(VI) elimination.

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“…40 . However, the reduced removal capacity in higher dosage could be due to inter-particle aggregation, overlapping of adsorption sites, and consequently, less active surface area 15,41 .…”

Section: Effects Of Sn/fe Mass Ratiomentioning

confidence: 99%

Preparation and Characterization of Nano-galvanic Bimetallic Fe/Sn Nanoparticles Deposited on Talc and its Enhanced Performance in Cr(VI) Removal

Bayat

Nasernejad

Falamaki

2021

Preprint

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“…The concentration of cadmium ions was determined by ICP after removal of CB-MNP by magnet and filtered through 0.22 μm filter membrane. The influences of pH conditions (pH=3, 4,5,6,7,8,9,10) and cation ions (NaCl, NaSO 4 , Na 2 CO 3 and Na 3 PO 4 ) on the absorption performance were also evaluated by similar procedures. The absorption capacity was calculated by the following equation:…”

Section: Absorption Of Cadmium Ionsmentioning

confidence: 99%

“…However, many materials are limited in application due to their low adsorption efficiency, poor chemical stability and difficulty in recycling. Nano materials as adsorbents have unique advantages because their specific surface area increases rapidly with the decrease of particle size [10][11][12]. Several kinds of nano materials such as nano zero valent iron, iron oxide, titanium dioxide have been utilized for OPEN ACCESS RECEIVED…”

mentioning

confidence: 99%

Facile fabrication of nanocomposites by modified carbon black loading with magnetite nanoparticles for fast removal of cadmium ions

Xiao

et al. 2020

Nano Ex.

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Magnetic nanomaterials have unique advantages in heavy metal ions absorption because of their large specific surface area and easy magnetic manipulation. Carbon nanotube or graphene loaded with magnetite nanoparticles (MNPs) have been utilized to fabricate absorbents with both high absorption capacity and fast magnetic capture. Herein, cheap commercial carbon black was used as a substitute for expensive carbon nanotube or graphene to fabricate nanocomposites (CB-MNP) by modified carbon black loaded with superparamagnetic MNPs. The fabrication process is accomplished by two steps. Carbon blacks (CB) were modified by nitric acid to produce a large number of carboxyl groups on the surface and make stable aqueous dispersion. Subsequently, CB-MNPs with high water stability and fast magnetic response were facilely prepared by iron precursors (the ratio of ferrous to ferric is 1:2) added into the above CB dispersion and tuned pH=10, finally added polyacrylic acid solution under sonication. Modified CB and CB-MNPs were characterized by transmission electron microscope (TEM), dynamic laser scattering (DLS), thermogravimetric analysis and so on. Water stability and magnetic response can be controlled by changing the proportion of CB and iron precursor. As a proof-of-concept, CB-MNPs were used for absorption removal of cadmium ions. Excellent performance was demonstrated with the removal efficiency of 71.41% and removal capacity of 39.99 mg·g −1 at the initial concentration of Cd 2+ as 5×10 −5 mol·l −1 . The effects of initial concentration of Cd 2+ , pH value and interfering anion ions were also investigated and the results indicate the potential application of CB-MNP in fast removal of heavy metal ions. IntroducationHeavy metal ions have strong toxicity to human beings and other organisms, some of which do harm to human health even in a very small concentration [1]. Effective removal of heave metal ions in waste water has attracted rising attention because these have caused serious environmental problems [2]. Many approaches such as chemical precipitation, adsorption, oxidation-reduction, evaporation, ionic exchange, electrochemical treatment, and membrane separation techniques have been developed for the removal of heavy metals from wastewaters [3][4][5][6].Adsorption technique is considered the most attractive technique because it is easy to operate and recycle [5]. The key to remove heavy metal ions from water by adsorption is the preparation and optimization of adsorption materials. Traditional adsorption materials such as clay, oxide, molecular sieve and activated carbon have been used to remove heavy metal ions [7-9]. However, many materials are limited in application due to their low adsorption efficiency, poor chemical stability and difficulty in recycling. Nano materials as adsorbents have unique advantages because their specific surface area increases rapidly with the decrease of particle size [10][11][12]. Several kinds of nano materials such as nano zero valent iron, iron oxide, titanium dioxide have b...

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“…Sewage disposal is a global concern subject due to its destructive effect on ecologic sustainability. Wastewater, produced during industrial manufacturing for such goods as textiles, cosmetics, and chemical plants, contains many types of toxic dyes, oils, and heavy metal ions [ 1 , 2 , 3 , 4 ]. To address this issue, various technologies have been researched and developed to dispose of heavy metal ions within an aqueous solution; these include membrane filtration [ 5 ], chemical coagulation [ 2 ], ion exchange [ 6 ], and electrochemistry deposition and adsorption [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Nanocellulose Aerogel Loaded with Modified UiO-66 as Efficient Adsorbent for Heavy Metal Ions Removal

Tan

2020

Nanomaterials

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Currently, the preparation of outstanding adsorbents has attracted public concern in environmentally friendly and sustainable pollutant redress. Herein, we report a directional freeze-drying method to prepare a strong and reusable adsorbent by introducing metal-organic framework which modified by ethylene diamine tetraacetic acid (named UiO-66-EDTA) into cellulose nanofiber (CNF) aerogel. Compared to traditional aerogels, the fabricated adsorbent showed a good flexibility and reusability by forming a homogeneous three-dimensional structure. By controlling the concentration of a crosslinkable carboxymethyl cellulose (CMC) solution, we produced aerogels with different pore structures and fibrillar, columnar, and lamellar morphologies. The obtained UiO-66-EDTA/CNF/CMC aerogel (U-EDTACCA) showed an excellent adsorption performance for a total of nine types of heavy metal ions, as the removal efficiency could reach 91%. Moreover, the aerogels could retain 88% of their original shape after five cycles. The aerogel may be an appropriate material for the adsorption of heavy metal ions.

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Role of nanomaterials as adsorbents in heavy metal ion removal from waste water: A review

Cited by 382 publications

References 103 publications

Preparation and Characterization of Nano-galvanic Bimetallic Fe/Sn Nanoparticles Deposited on Talc and its Enhanced Performance in Cr(VI) Removal

Preparation and Characterization of Nano-galvanic Bimetallic Fe/Sn Nanoparticles Deposited on Talc and its Enhanced Performance in Cr(VI) Removal

Facile fabrication of nanocomposites by modified carbon black loading with magnetite nanoparticles for fast removal of cadmium ions

Anisotropic Nanocellulose Aerogel Loaded with Modified UiO-66 as Efficient Adsorbent for Heavy Metal Ions Removal

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