Enhanced adsorption of As(V) and Mn(VII) from industrial wastewater using multi-walled carbon nanotubes and carboxylated multi-walled carbon nanotubes

Egbosiuba, Titus Chinedu; Abdulkareem, A. S.; Kovo, A. S.; Afolabi, Eyitayo Amos; Tijani, Jimoh Oladejo; Roos, W.

doi:10.1016/j.chemosphere.2020.126780

Cited by 136 publications

(38 citation statements)

References 52 publications

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“…The adsorption attained equilibrium in the third stage when the amount of metal ions adsorbed onto the NCH equaled the amount of metal ions desorbing from the NCH. The rapid adsorption at the initial stage is due to the availability of huge number of adsorptive sites (El-Kady et al, 2016;Egbosiuba et al, 2020) and a high external diffusion rate of metal ions (Doulia et al, 2009). Adsorption transfer from extra diffusion to internal diffusion was blamed for the subsequent delayed adsorption in the second stage, while the saturated adsorption stage is due to the electrostatic repulsion between metal ions and the adsorbent, which limits the function of the remaining activated sites (Doulia et al, 2009;Shi et al, 2009).…”

Section: Effect On Contact Timementioning

confidence: 99%

Nanocarbon hybrid for simultaneous removal of arsenic, iron and manganese ions from aqueous solutions

Embaby¹,

Moniem²,

Fathy³

et al. 2021

Heliyon

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Heavy metal contamination is a severe problem with serious ecological and human health effects due to its toxic effect and tendency to accumulate throughout the food chain. Batch experiments were conducted to investigate the simultaneous removal of arsenic, iron and manganese ions from aqueous solutions using Nanocarbon hybrid (NCH). Nanocarbon hybrid (NCH) of carbon xerogel decorated with 1wt% multi-walled carbon nanotubes was prepared by carbonization at 850 C for 2 h. The TEM, SEM, EDX, FTIR, and N 2 adsorption-desorption measurements were used to characterize the prepared NCH. NCH is enriched with surface oxygen functional groups and micropores as well as it have total surface area of 162 m 2 /g and total pore volume of 0.129 cm 3 /g. The adsorption of metal ions onto NCH, which confirmed by EDX, happened quickly, with 30%, 97%, and 41% of As, Fe, and Mn adsorbed in less than 10 min, however the equilibrium time was achieved in less than 30 min. The maximum adsorption capacities for As, Fe, and Mn ions onto NCH were 20, 48, and 21 mg/g, respectively. The experimental adsorption results of the three metal ions showed linearly fitting with Freundlich isotherms. In addition, the computed adsorption energies for Fe, Mn, and As ions were 4.08, 1.95, and 2.42 kJ/mol, indicating physical adsorption. NCH are easily regenerated and reusable sorbent owing to the adsorption-desorption studies. Conclusively, NCH is promising material for removing mixture of metal ions from aqueous media.

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Section: Effect On Contact Timementioning

confidence: 99%

Nanocarbon hybrid for simultaneous removal of arsenic, iron and manganese ions from aqueous solutions

Embaby¹,

Moniem²,

Fathy³

et al. 2021

Heliyon

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“…where q regenerated and q original (mg g -1 ) are the adsorption capacities per unit mass of regenerated and virgin NAC, respectively [22].…”

Section: Regeneration Of Nacmentioning

confidence: 99%

Taguchi Optimization Studies for Abatement of 2‐Chlorophenol Using Neem Seed Activated Carbon

Mahapatra

Kumar

2022

Chem Eng & Technol

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The abatement of 2-chlorophenol (2CP) was carried out by an adsorption process using an economical, yet efficient activated carbon prepared from neem seeds activated carbon (NAC) as the adsorbent. The aim was to optimize the process parameters for 2CP adsorption onto NAC using Taguchi's optimization. An L 9 orthogonal array was used for the optimization studies of the process parameters. The signal-to-noise ratio and F-test values were the basis for selecting the significant parameters. The NAC was characterized using Brunauer-Emmett-Teller (BET), spectroscopic, microscopic, and X-ray diffraction analysis. The BET surface area was found to be 246 m 2 g -1 . Following the optimal conditions, an uptake capacity of 41 mg g -1 was observed. Finally, the regeneration studies revealed that the adsorption ability of NAC remained intact for up to three regeneration cycles.

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“…The carboxylated MWCNTs were able to achieve increased adsorption of As(V) and Mn(VII) at 250 and 298 mg/g, respectively. The thermodynamic results showed metal removal takes place through chemisorptions (Egbosiuba et al, 2020).…”

Section: Nano-adsorbents and Nanofiltration Membranesmentioning

confidence: 99%

Microbial Nanotechnology for Bioremediation of Industrial Wastewater

Mandeep

Shukla

2020

Front. Microbiol.

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Pollutant removal from industrial effluents is a big challenge for industries. These pollutants pose a great risk to the environment. Nanotechnology can reduce the expenditure made by industries to mitigate these pollutants through the production of eco-friendly nanomaterials. Nanomaterials are gaining attention due to their enhanced physical, chemical, and mechanical properties. Using microorganisms in the production of nanoparticles provides an even greater boost to green biotechnology as an emerging field of nanotechnology for sustainable production and cost reduction. In this mini review, efforts are made to discuss the various aspects of industrial effluent bioremediation through microbial nanotechnology integration. The use of enzymes with nanotechnology has produced higher activity and reusability of enzymes. This mini review also provides an insight into the advantages of the use of nanotechnology as compared to conventional practices in these areas.

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Enhanced adsorption of As(V) and Mn(VII) from industrial wastewater using multi-walled carbon nanotubes and carboxylated multi-walled carbon nanotubes

Cited by 136 publications

References 52 publications

Nanocarbon hybrid for simultaneous removal of arsenic, iron and manganese ions from aqueous solutions

Nanocarbon hybrid for simultaneous removal of arsenic, iron and manganese ions from aqueous solutions

Taguchi Optimization Studies for Abatement of 2‐Chlorophenol Using Neem Seed Activated Carbon

Microbial Nanotechnology for Bioremediation of Industrial Wastewater

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