Study of metal ion sorption from acidic solutions

Sediments are normally the final pathway of both natural and anthropogenic components produced or derived from the environment. Sediment quality is a good indicator of pollution in the water column, where heavy metals and other organic pollutants tend to concentrate. Metals are introduced in aquatic systems as a result of the weathering of soils and rocks, from volcanic eruptions, and from a variety of human activities involving the mining, processing, or use of metals and/or substances that contain metal pollutants. Heavy metal concentration in the water column can be relatively low in some cases, but the concentrations in the sediment may be elevated. The presented work aimed to investigate the pollutant levels of some heavy metals (Fe, Mn, Al, Cu, Zn, As, Cd, Pb) in the water and sediments related to acid mine drainage (AMD) produced from an abandoned sulphide mine in Smolnik in Eastern Slovakia. A metal pollution index was used to compare the total content of metals at five sampling stations. The level of partitioning of the metals between the surface water and sediments in the area was calculated using Partition coefficients and the correlation coefficients between the metal pairs in both media were calculated by a Pearson coefficient.

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“…The behaviour of metals in sediments is probably related to the change of pH and, thus, the possibility of their precipitation [26,27]. …”

Section: Resultsmentioning

confidence: 99%

Metal Pollution Indices of Bottom Sediment and Surface Water Affected by Acid Mine Drainage

Singovszká¹,

Bálintová²,

Demcak³

et al. 2017

Metals

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“…Researchers have focused on the synthesis and application of various types of adsorbents. Among the best commonly applied adsorbents to remove heavy metals are activated carbon [19][20][21][22], iron oxides [23][24][25][26], zeolites [27][28][29][30][31], and sawdust [32]. The high adsorption capacities of these biomaterials are partly linked to their highly developed porous structures and their highly specific surface areas.…”

Section: Well-known Materials Used In Sorption Processesmentioning

confidence: 99%

Some Well-Known Alginate and Chitosan Modifications Used in Adsorption: A Review

Benettayeb

Ghosh

Usman

et al. 2022

Water

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Owing to environmental pollution and increasingly strict regulations, heavy metals have attracted the attention of many researchers in various disciplines. Alginate and chitosan derivatives have gained popularity as biosorbents for water treatment. An increase in the number of publications on modified biosorbents for the biosorption of toxic compounds reveals widespread interest in examining the requirements and positive contribution of each modification type. This paper reviews the advantages and disadvantages of using alginate and chitosan for adsorption. Well-known modifications based on chitosan and alginate, namely, grafting, functionalization, copolymerization and cross-linking, as well as applications in the field of adsorption processes, especially amino acid functionalization, are reviewed. The selection criteria for the best biosorbents and their effectiveness and proposed mechanism of adsorption are discussed critically. In the conclusion, the question of why these adsorbents need modification before use is addressed.

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“…AMD threatens the environment directly through polluting streams, rivers, groundwater, and natural ecosystems. The outflow from old mines has a negative impact on the pH values and increases the levels of sulphate and heavy metals [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…These contaminants mostly present in the acid mine drainage of closed copper and zinc mines [13][14][15]. Previous research [3][4][5]16] was dedicated to AMD monitoring and treatment. The highest value of contaminants was obtained in Pech shaft at a pH value 4.0 ± 0.1 [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water

et al. 2020

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Organic waste materials and semi-products containing cellulose are used as low-cost adsorbents that are able to compete with conventional sorbents. In addition, their capacity to bind heavy metal ions can be intensified by chemical treatments using mineral and organic acids, bases, oxidizing agents, and organic compounds. In this paper, we studied the biosorption capacity of natural and modified wooden sawdust of poplar, cherry, spruce, and hornbeam in order to remove heavy metals from acidic model solutions. The Fourier transform infrared spectroscopy (FTIR) spectra showed changes of the functional groups due to the alkaline modification of sawdust, which manifested in the considerably increased intensity of the hydroxyl peaks. The adsorption isotherm models clearly indicated that the adsorptive behavior of metal ions in treated sawdust satisfied not only the Langmuir model, but also the Freundlich model. The adsorption data obtained for studied sorbents were better fitted by the Langmuir isotherm model for both metals, except for spruce sawdust. Surface complexation and ion exchange are the major mechanisms involved in metal ion removal. We investigated the efficiency of the alkaline modified sawdust for metal removal under various initial concentrations of Cu(II) and Zn(II) from model solutions. The highest adsorption efficiency values (copper 94.3% at pH 6.8 and zinc 98.2% at pH 7.3) were obtained for poplar modified by KOH. For all types of sawdust, we found that the sorption efficiency of modified sorbents was higher in comparison to untreated sawdust. The value of the pH initially increased more in the case of modified sawdust (8.2 for zinc removal with spruce NaOH) and then slowly decreased (7.0 for Zn(II) with spruce NaOH).

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Study of metal ion sorption from acidic solutions

Cited by 15 publications

References 14 publications

Metal Pollution Indices of Bottom Sediment and Surface Water Affected by Acid Mine Drainage

Metal Pollution Indices of Bottom Sediment and Surface Water Affected by Acid Mine Drainage

Some Well-Known Alginate and Chitosan Modifications Used in Adsorption: A Review

Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water

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