Toxicity of solid residues resulting from wastewater treatment with nanomaterials

Nogueira, Verónica; Lopes, Isabel; Rocha-Santos, Teresa; Gonçalves, Fernando; Pereira, Ruth

doi:10.1016/j.aquatox.2015.05.021

Cited by 27 publications

(8 citation statements)

References 29 publications

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“…Objects when are at nanoscale displays considerable properties compared to their bulk counterparts , . Some of these properties are extremely high specific area and chemical reactivity, super magnetism behaviors, short intraparticle diffusion distance and easier penetration into cells , . NMs are great adsorbents owing to their large surface area; therefore they are used widely in treating wastewaters containing heavy metals .…”

Section: Current Methodsmentioning

confidence: 99%

“…Some of these properties are extremely high specific area and chemical reactivity, super magnetism behaviors, short intraparticle diffusion distance and easier penetration into cells , . NMs are great adsorbents owing to their large surface area; therefore they are used widely in treating wastewaters containing heavy metals . It should be noticed that increasing use of nanoproducts and nano‐adsorbents increase the risk of nano‐pollutants in the environment .…”

Section: Current Methodsmentioning

confidence: 99%

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Removal of Heavy Metals from Industrial Wastewaters: A Review

et al. 2017

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Heavy metals like arsenic, copper, cadmium, chromium, nickel, zinc, lead, and mercury are major pollutants of fresh water reservoirs because of their toxic, non‐biodegradable, and persistent nature. The industrial growth is the major source of heavy metals introducing such pollutants into different segments of the environment including air, water, soil, and biosphere. Heavy metals are easily absorbed by fishes and vegetables due to their high solubility in the aquatic environments. Hence, they may accumulate in the human body by means of the food chain. Various methods have been developed and used for water and wastewater treatment to decrease heavy metal concentrations. These technologies include membrane filtration, ion‐exchange, adsorption, chemical precipitation, nanotechnology treatments, electrochemical and advanced oxidation processes. In this review, the methods as well as their mechanisms and efficiency are discussed.

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Section: Current Methodsmentioning

confidence: 99%

Section: Current Methodsmentioning

confidence: 99%

Removal of Heavy Metals from Industrial Wastewaters: A Review

et al. 2017

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“…Chromium pollution is a serious environmental problem and Cr (VI) has been classified in Group 1 by the IARC (International Agency for Research on Cancer) [1][2][3][4][5]. Cr (VI) has many negative impacts on earthworms, plants, fish, and other lives.…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

et al. 2021

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A highly efficient reduction process of Cr (VI) with biochar was conducted in this paper. The results showed that nearly 100% Cr (VI) was reduced at selected reaction conditions: Dosage of biochar at m (C)/m(Cr) = 3.0, reaction temperature of 90 °C, reaction time of60 min, and concentration of H2SO4 of 20 g/L. The reduction kinetics analysis demonstrated that the reduction of Cr (VI) fitted well with the pseudo-first-order model and the apparent activation energy was calculated to be 40.24 kJ/mol. Response surface methodology confirmed that all of the experimental parameters had a positive effect on the reduction of Cr (VI). The influence of each parameter on the reduction process followed the order: Dosage of biochar>concentration of H2SO4>reaction temperature >reaction time. This paper provides a versatile strategy for the treatment of wastewater containing Cr (VI) and shows a bright tomorrow for wastewater treatment.

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“…Chromium(VI), placed in the fourth period of the periodic table 1 – 3 , was a toxic heavy metal and is classified in Group 1 (carcinogenic to humans) by the International Agency for Research on Cancer 4 , 5 . It was harmful to the environment and human health, thus, some treatments were needed.…”

Section: Introductionmentioning

confidence: 99%

Reduction behavior of chromium(VI) with oxalic acid in aqueous solution

Peng

Guo

2020

Sci Rep

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The direct Cr(VI) reduction process by oxalic acid was conducted. The existence of Cr(VI) in the reaction medium was measured by software Visual MINTEQ and the concentration of Cr(VI) was measured by ICP-OES. The results showed that the Cr(VI) was efficiently reduced by oxalic acid at high reaction temperature and high dosage of oxalic acid. The reduced product, Cr(III), was easily generated stable complex compounds (Cr(HC2O4)3) with oxalate, which displayed a negative effect on the reduction process. The high reaction temperature and high acidic medium could destroy the stable structure of a complex compound to release oxalate, and facilitate the reduction of Cr(VI). Generally, the results showed in this paper provided a versatile strategy for Cr(VI) reduction and exhibited a bright application future for real wastewater treatment.

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Toxicity of solid residues resulting from wastewater treatment with nanomaterials

Cited by 27 publications

References 29 publications

Removal of Heavy Metals from Industrial Wastewaters: A Review

Removal of Heavy Metals from Industrial Wastewaters: A Review

Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

Reduction behavior of chromium(VI) with oxalic acid in aqueous solution

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