Sorption and desorption of potentially toxic metals (Cd, Cu, Ni and Zn) by soil amended with bentonite, calcite and zeolite as a function of pH

Tahervand, Samaneh; Jalali, Mohsen

doi:10.1016/j.gexplo.2017.07.005

Cited by 102 publications

(27 citation statements)

References 53 publications

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“…Calcite is an effective option for heavy metal stabilization in polluted soils as Lahori et al, (2017) suggested that calcite have immense tendency to react with heavy metals it can be exhibited by Ca 2+ in various frictions in calcite. Similarly, Tahervand and Jalali, (2017) investigated that the mobility of heavy metals was decreased by calcite because of its high pH and crushed brick and gravel nature. They investigated that calcite decreased >90% of PTEs.…”

Section: Cacl 2 and Tclp Extractable Nimentioning

confidence: 99%

Influence of Various Passivators for Nickel Immobilization in Contaminated Soil of China

AliUmeed

BashirSaqib

Shaaban

et al. 2019

Environmental Engineering Science

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In agricultural field, nickel (Ni) contamination has become a serious concern/threat all over the world due to its hazardous effects on ecosystem and food chain. An incubation study was conducted to investigate the simultaneous efficiency of rice straw (RS) and its derived biochar (BI), calcium carbonate (calcite), zeolite (ZE), and triple superphosphate (TSP) on the stabilization of Ni in contaminated soil. Various chemical extraction techniques, including the sequential extraction (BCR), leaching toxicity (TCLP) test, and single CaCl 2 extraction, were performed. The results revealed that greater reduction in acid-soluble fractions of Ni was observed by 45%, 65.1%, 42.1%, 55.7%, and 33.9% with RS, BI, ZE, calcite at 2%, and TSP 0.5% application rate, respectively. Similarly, TCLP and CaCl 2-extractable Ni were significantly decreased by 49.8% and 97.5% with 2% BI application rate, respectively. The soil pH, EC, and organic matter were significantly improved with the incorporation of RS, BI, ZE, TSP, and calcite amendments. Overall, among all the amendments, the incorporation of BI and calcite was considered to be the best option for Ni immobilization and thereby reducing its mobility in Ni contaminated soil. These findings suggest that RS biochar and calcite can be used as Ni stabilizers in contaminated agricultural soils.

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Section: Cacl 2 and Tclp Extractable Nimentioning

confidence: 99%

Influence of Various Passivators for Nickel Immobilization in Contaminated Soil of China

AliUmeed

BashirSaqib

Shaaban

et al. 2019

Environmental Engineering Science

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“…During sedimentation, organic matter or other ions adsorb onto each other as complex molecules and are deposited as the sediment [15]. The stability of a complex molecule depends on pH, in which a decrease in pH makes a complex unstable and leads to its dissociation [16]. Hence, the decreasing pH resulting from the SC-SMFC application is considered to cause the dissociation of metal complexes.…”

Section: B Dissociation Of Metal Complexes In Sediment By Sc-smfcmentioning

confidence: 99%

Changing Organic Matter Characteristics of Littoral Sediment by Solar Cell-Combined Sediment Microbial Fuel Cell

Touch¹,

Takata²,

Yamaji³

et al. 2018

IJESD

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Abstract-Metal ion or clay mineral-adsorbed organic matter present in littoral sediment is known as hardly decomposed organic matter, which is difficult to use as a natural resource. This study is aimed at changing the organic matter characteristics of littoral sediment through the application of solar cell-combined sediment microbial fuel cell (SC-SMFC). The experimental results showed that the sediment pH decreases and the concentration of metal ions in the sediment pore water increases after the application of SC-SMFC. This suggests the dissociation of metal complexes in the sediment. From the analysis results of organic matter characteristics, variations in the ignition characteristics of the sediment and the absorbance at wave number ranges of 3300-3800 and 800-1800 cm -1 were confirmed, indicating changes in organic matter characteristics of the sediment. It can be concluded that SC-SMFC can separate organic matter from metal complexes, leading to the transformation of organic matter in sediment from valueless into a useful product.

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“…Clay mineral helps to reduce the number of hydrogen ions (H + ) present in the soil. There are two reasons for this: firstly, the negative ions on the surface of the clay minerals (SiOor AlO -) can absorb the hydrogen ions (H + ) contained in the soil 24 ; secondly, the hydrogen ions (H + ) in the soil replace the elements in the structure of clay minerals such as Na + , Mg 2+ and Ca 2+ 25, 26 .…”

Section: Soil Ph After Adding Modifiersmentioning

confidence: 99%

Acid soil amendment by zeolite, sepiolite and diatomite

Chaiyaraksa¹,

Tumtong²

2019

ScienceAsia

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The aim of this research was to reduce the heavy metal movement to the biosystem using clay minerals including zeolite, sepiolite, and diatomite. The clay soil and sandy loam soil were made contaminated with 200, 350, 700, and 250 mg of Zn, Cu, Cr, and Ni per kg of soil, respectively. The ratio of clay minerals added to soils was 2.5%, 5%, and 7.5%. The determination of various forms of heavy metals bound to soil mixed with clay minerals and left for a period of 30 and 60 days was carried out using the sequential extraction method. The results indicated that Ni and Zn were mostly in an exchangeable form, while Cu and Cr were mostly in an oxide bound form and an organically bound form. The pH of the soils increased after adding clay minerals. Diatomite caused the smallest change in the pH value. Chromium had the best adsorption capacity by bonding with various elements in the soil, followed by Cu, Zn, and Ni, respectively. The addition of sepiolite caused more heavy metals in a stable form than adding zeolite and diatomite. When adding clay minerals to both types of soil, the highest impact was on Ni, followed by Zn, Cu, and Cr, respectively. The bioavailable index (BI) value was the least when adding sepiolite. The risk of heavy metals moving to the biosystem was lower when increasing the incubation time. Without adding any clay mineral, the BI value of metals in the sandy clay loam soil was higher than that in the clay soil.

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Sorption and desorption of potentially toxic metals (Cd, Cu, Ni and Zn) by soil amended with bentonite, calcite and zeolite as a function of pH

Cited by 102 publications

References 53 publications

Influence of Various Passivators for Nickel Immobilization in Contaminated Soil of China

Influence of Various Passivators for Nickel Immobilization in Contaminated Soil of China

Changing Organic Matter Characteristics of Littoral Sediment by Solar Cell-Combined Sediment Microbial Fuel Cell

Acid soil amendment by zeolite, sepiolite and diatomite

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