Sorption of Cu2+ and Zn2+ Ions by Humic Acids of Tundra Peat Gley Soils (Histic Reductaquic Cryosols)

Лодыгин, Е. Д.

doi:10.1134/s1064229319070093

Cited by 14 publications

(2 citation statements)

References 25 publications

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“…In addition, Langmuir isotherm seems good for Cu adsorption at lower pH while Freundlich is better for its adsorption at higher pH, which also suggested that two adsorption mechanisms are at work: adsorption on homogeneous surfaces and followed by nucleation on heterogeneous surfaces. Lodygin [32] also showed possible existence of two fixation mechanisms of Cu ions on the surface of humic acid. In short, Cu adsorption on Cambisols was highly pH-dependent, resulting in lower adsorption at lower pH whereas higher nucleation/precipitation at higher pH.…”

Section: Resultsmentioning

confidence: 94%

Copper Sorption and Transport in an Acidic Brown Soil

et al. 2021

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The sorption and transport of copper (Cu) in an acidic brown soil were studied using batch and column experiments. The results showed that Cu adsorption fitted better Langmuir isotherm at low pH (3.13) whereas Freundlich equation fitted better at high pH (5.87), and affinity (K and K F ) increased significantly from 0.00676 to 0.0121 L mg -1 , and from 33.05 to 135.98, respectively, with pH increase, resulting in a very great increase in adsorption capacity (Q max ) from 970 to 2272 mg kg -1 . Its kinetics was found to be better described by a pseudo-second order model (R 2 > 0.997), where sorption rate (k 2 and h) was as low as 0.0237 and 0.0013 kg mg -1 d -1 , and 23.89 and 106.12 mg kg -1 d -1 , respectively, at pH 3.19, much lower (10-20 times) than those at pH 6.92. At pH 5.87, the breakthrough curve of Cu showed substantial retardation and low peak concentration (C/C 0 = 0.64); whereas at pH 3.17, full breakthrough (C/C 0 = 1) was observed, meaning great increase in mobility of Cu. Generally, two different mechanisms governed Cu sorption and transport: CuOH + was precipitated on clay mineral surface and weaker complexation with DOM at higher pH (>5); whereas Cu 2+ adsorbed to SOM surface and stronger complexation with DOM at lower pH (<4.2).

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Section: Resultsmentioning

confidence: 94%

Copper Sorption and Transport in an Acidic Brown Soil

et al. 2021

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“…According to the study, the oxidative treatment increased the amount of carboxylic, ketone, and quinoid groups on the adsorbent structure. In addition to the already stated studies, other literature on the successful adsorption of iron (Ashraf et al 2019), chromium (Ashraf et al 2019), nickel (Ashraf et al 2019), copper (Lodygin 2019;Naymushina and Gaskova 2019), zinc (Lodygin 2019), lead (Lodygin et al 2020;Pelinsom Marques et al 2020), and cadmium (Lodygin et al 2020;Pelinsom Marques et al 2020) onto peat-based adsorbent still exist. In summary, heavy metal adsorption potentials of raw and modified peat mostly occur via ion exchange and/ or electrostatic interaction mechanisms.…”

Section: Peat and Humic Soilmentioning

confidence: 99%

Methods to prepare biosorbents and magnetic sorbents for water treatment: a review

et al. 2023

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Access to drinkable water is becoming more and more challenging due to worldwide pollution and the cost of water treatments. Water and wastewater treatment by adsorption on solid materials is usually cheap and effective in removing contaminants, yet classical adsorbents are not sustainable because they are derived from fossil fuels, and they can induce secondary pollution. Therefore, biological sorbents made of modern biomass are increasingly studied as promising alternatives. Indeed, such biosorbents utilize biological waste that would otherwise pollute water systems, and they promote the circular economy. Here we review biosorbents, magnetic sorbents, and other cost-effective sorbents with emphasis on preparation methods, adsorbents types, adsorption mechanisms, and regeneration of spent adsorbents. Biosorbents are prepared from a wide range of materials, including wood, bacteria, algae, herbaceous materials, agricultural waste, and animal waste. Commonly removed contaminants comprise dyes, heavy metals, radionuclides, pharmaceuticals, and personal care products. Preparation methods include coprecipitation, thermal decomposition, microwave irradiation, chemical reduction, micro-emulsion, and arc discharge. Adsorbents can be classified into activated carbon, biochar, lignocellulosic waste, clays, zeolites, peat, and humic soils. We detail adsorption isotherms and kinetics. Regeneration methods comprise thermal and chemical regeneration and supercritical fluid desorption. We also discuss exhausted adsorbent management and disposal. We found that agro-waste biosorbents can remove up to 68–100% of dyes, while wooden, herbaceous, bacterial, and marine-based biosorbents can remove up to 55–99% of heavy metals. Animal waste-based biosorbents can remove 1–99% of heavy metals. The average removal efficiency of modified biosorbents is around 90–95%, but some treatments, such as cross-linked beads, may negatively affect their efficiency.

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