Enhanced adsorption efficiency of inorganic chromium (VI) ions by using carbon-encapsulated hematite nanocubes

Trang, Vu Thi; Tam, Le Thi; Quy, Nguyen Van; Phan, Vu Ngoc; Tuan, Hoang Van; Huy, Trần Quang; Dinh, Ngo Xuan; Le, Anh‐Tuan

doi:10.1016/j.jsamd.2020.05.007

Cited by 18 publications

(16 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the maximum adsorption capacity of Cr(VI) was obtained as 298.12 mg/g at the pH of 3. As reported previously, , , , and are the various forms of chromium 60 in a solution. Meanwhile, and are the dominant form of Cr(VI) in the solution at low pH, while are present at higher pH 61 .…”

Section: Resultssupporting

confidence: 55%

“… Adsorbent Adsorbate pH Temp. (K) Time (min) Surface area (m 2 /g) q m (mg/g) Isotherm/kinetics References α-Fe2O3@C Cr(VI) 3 298 360 ND 76.92 Langmuir/PSO Trang et al 60 GnZVI/PAC Cr(VI) 2 323 80 107 53.48 Langmuir/PSO Khosravi et al 57 DWHR Cr(VI) 3 298 120 ND 1.28 Freundlich/PSO Kumar and Chauhan 73 CES Ni(II) 6.5 298 960 ND 163.6 Langmuir/PSO Peng et al 74 Goethite Ni(II) 9 363 60 5.12 0.943 Langmuir/PSO Dash et al 63 BTMC Ni(II) 5 298 30 ...…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of Cr(VI), Ni(II), Fe(II) and Cd(II) ions by KIAgNPs decorated MWCNTs in a batch and fixed bed process

Egbosiuba

Abdulkareem

Kovo

et al. 2021

Sci Rep

View full text Add to dashboard Cite

The efficient removal of toxic metals ions from chemical industry wastewater is considered problematic due to the existence of pollutants as mixtures in the aqueous matrix, thus development of advanced and effective treatment method has been identified as a panacea to the lingering problems of heavy metal pollution. In this study, KIAgNPs decorated MWCNTs nano adsorbent was developed using combination of green chemistry protocol and chemical vapor deposition techniques and subsequently characterized using UV–Vis, HRTEM, HRSEM, XRD, FTIR and XPS. The adsorptive efficiency of MWCNTs-KIAgNPs for the removal of Cr(VI), Ni(II), Fe(II), Cd(II) and physico-chemical parameters like pH, TDS, COD, BOD, nitrates, sulphates, chlorides and phosphates from chemical industrial wastewater was examined in both batch and fixed bed systems. The result exhibited successful deposition of KIAgNPs on the surface of MWCNTs as confirmed by the microstructures, morphology, crystalline nature, functional groups and elemental characteristics of the MWCNTs-KIAgNPs. Optimum batch adsorption parameters include; pH (3 for Cr(VI) and 6 for Ni(II), Fe(II) and Cd(II) ions), contact time (60 min), adsorbent dosage (40 mg) and temperature (318 K). The binding capacities were obtained as follows; Cr6+ (229.540 mg/g), Ni2+ (174.784 mg/g), Fe2+ (149.552) and Cd2+ (121.026 mg/g), respectively. Langmuir isotherm and pseudo-second order kinetic model best described the experimental data in batch adsorption, while the thermodynamic parameters validated the chemisorption and endothermic nature of the adsorption process. In continuous adsorption, the metal ions were effectively removed at low metal influent concentration, low flow rate and high bed depth, whereby the experimental data were designated by Thomas model. The high physico-chemical parameters in the wastewater were successfully treated in both batch and fixed bed systems to fall within WHO permissible concentrations. The adsorption/desorption study illustrated over 80% metal removal by MWCNTs-KIAgNPs even after 8th adsorption cycle. This study demonstrated excellent performance of MWCNTs-KIAgNPs for chemical industry wastewater treatment.

show abstract

Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Adsorption of Cr(VI), Ni(II), Fe(II) and Cd(II) ions by KIAgNPs decorated MWCNTs in a batch and fixed bed process

Egbosiuba

Abdulkareem

Kovo

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…For the fourth time adsorption–desorption cycle, there is a marked decline for the Cr (VI) adsorption from 118.5 ± 0.3 mg/g to 93.4 ± 0.1 mg/g, which may be due to PDA consumption from PES/PDA ultrafine fibers or the parts of functional groups were inactivation. It shows that the PES/PDA ultrafine fibers have higher reusability (decrease by 1.8% for 3 cycles) than the other adsorbent materials, α‐Fe 2 O 3 @C nanocomposites 54 (decrease by 4.2% for 3 cycles), succinate/Alg porous gel beads 55 (decrease by 4.9% for 3 cycles), and MnO 2 /CS adsorbent (decrease by14.1% for 5 cycles) 56 …”

Section: Resultsmentioning

confidence: 99%

A high Cr (VI) absorption efficiency and easy recovery adsorbent: Electrospun polyethersulfone/polydopamine nanofibers

Wei

Zhang²,

Wang

et al. 2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

Cr (VI) is a highly toxic pollutant to humans, to achieve high adsorption capacity, easy recovery, and good reusability, polyethersulfone/polydopamine (PES/PDA) ultrafine fibers were prepared successfully. A series of preparing effect factors were investigated systematically and the optimum one is 8.5 pH value at room temperature and 2 g/L dopamine concentration. And then they were used as an adsorbent for the removal of Cr (VI) ions from wastewater. The effect factors pH, the adsorbent dosage, and time were discussed on Cr (VI) adsorption process and the Cr (VI) adsorption behavior was investigated. It is found that the maximum Cr (VI) adsorption capacity is 115.2 ± 4.8 mg/g at pH = 3 using 0.06 g PES/PDA with 80 mins. The Cr (VI) adsorption process followed the pseudo‐second‐order model (r2 ≥ 0.99) and adsorption isotherms were fitted to the Langmuir model (R2 ≥ 0.999). Furthermore, the Cr (VI) adsorption mechanism was supposed according to the X‐ray photoelectron spectroscopic results. Finally, PES/PDA ultrafine fibers were considered to be a promising adsorbent with good stability (decomposing temperature, 356°C), high adsorption efficiency (112.1 ± 2.5 mg/g), and good reusability (three times) on the coexistence of anions and the actual industry wastewater environment.

show abstract

“…The characteristic Fe-O stretching mode is evident at about 500-560 cm −1 [46][47][48][49][50]. The wide band found at 3211 cm −1 and at 1630 cm −1 are each assigned to the O-H stretch and H-O-H bending vibration modes respectively due to adsorbed water on the surface [46][47][48][49][50]. These peaks are pronounced only with the sample immersed in Cr(VI) solution.…”

Section: Adsorptive Removal Of Cr(vi) By α-Fe 2 O 3 Nanobladesmentioning

confidence: 95%

“…The adsorption of Cr(VI) onto the α-Fe 2 O 3 nanostructures is primarily driven by the electrostatic interactions between the adsorbent and adsorbate [28,46,47,49,50]. According to its speciation diagram, Cr in solution exists primarily as HCrO 4 − anions at pH = 2 [51,52].…”

Section: Adsorptive Removal Of Cr(vi) By α-Fe 2 O 3 Nanobladesmentioning

confidence: 99%

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Aquino

Balela

2020

SN Appl. Sci.

View full text Add to dashboard Cite

This work presents a facile method of growing zinc-doped α-hematite (Zn-doped α-Fe 2 O 3) nanostructures via thermal oxidation of Fe sheet in the presence of Zn 2+ mist. Both undoped and Zn-doped α-Fe 2 O 3 nanostructures exhibit blade-like morphology mixed with some nanowires. In general, smaller yet denser nanostructures are formed at higher oxidation temperatures. On the other hand, misting (water vapor) enhances the oxidation rate, leading to larger nanoblades. Raman and energy dispersive X-ray spectroscopy reveal the successful incorporation of Zn in the α-Fe 2 O 3 lattice. However, excessive Zn 2+ (0.01 M) promotes the formation of large Zn hydroxide chloride particles on top of the α-Fe 2 O 3 nanoblades. The undoped α-Fe 2 O 3 nanostructures prepared at 650 °C in water vapor effectively adsorb hexavalent chromium [Cr(VI)] in aqueous solution with about 95% removal efficiency. The sample oxidized in 0.005 M Zn 2+ mist is also efficient in the Fenton-assisted photodegradation of methyl orange with > 90% removal even after five degradation cycles.

show abstract

Enhanced adsorption efficiency of inorganic chromium (VI) ions by using carbon-encapsulated hematite nanocubes

Cited by 18 publications

References 27 publications

Adsorption of Cr(VI), Ni(II), Fe(II) and Cd(II) ions by KIAgNPs decorated MWCNTs in a batch and fixed bed process

Adsorption of Cr(VI), Ni(II), Fe(II) and Cd(II) ions by KIAgNPs decorated MWCNTs in a batch and fixed bed process

A high Cr (VI) absorption efficiency and easy recovery adsorbent: Electrospun polyethersulfone/polydopamine nanofibers

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Contact Info

Product

Resources

About