Removal of chromate anions and immobilization using surfactant-modified zeolites

Rivera, Gloria Lourdes Dimas; Hernández, Annia Martínez; Cabello, Anna Fernanda Pérez; Barragán, Ericka Lilian Rivas; Montes, Adriana Liñán; Flores-Escamilla, Gerardo A.; Sandoval-Rangel, Ladislao; Vázquez, Santiago; Río, David A. De Haro Del

doi:10.1016/j.jwpe.2020.101717

Cited by 12 publications

(4 citation statements)

References 73 publications

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“…The process description by the Freundlich isotherm indicates that sorption occurs on heterogonous surfaces, and the obtained value n < 1 implies on the chemical nature of the bonding [17,36]. The immobilization process description by the PSO and Freundlich models has been reported also by other authors for Cr(VI) removal from waters by surfactant modified zeolite [19,21].…”

Section: Resultssupporting

confidence: 57%

Removal of Cr(VI) from wastewater by silver-loaded natural clinoptilolite

Panayotova

2021

E3S Web Conf.

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Presence of hexavalent chromium, Cr(VI), in water is an important environmental and human health problem. Natural zeolites are widely accepted as non-expensive adsorbents for sustainable remediation, however they are not effective in removing metals in anionic form. The paper presents study on use of silver (Ag) modified natural clinoptilolite to immobilize Cr(VI) ions from model and real neutral to slightly alkaline wastewater. Increasing the initial pollutant concentration increases the removed amount (80 % removal from model wastewater in 45 min at initial concentration of 30 mg Cr(VI)/L). The pseudo-second order kinetic equation best describes the Cr(VI) immobilization by the Ag-modified zeolite, which is indicative for the chemical nature of the rate-limiting step of the process. The data obtained are best fitted to the Freundlich adsorption isotherm. The Ag-modified clinoptilolite removes in 30 min over 80 % of Cr(VI), over 75 % of Cu(II) and over 70 % of Zn(II) that present simultaneously in an industrial wastewater. Due to its ability to remove Cr(VI) species, in combination with some heavy metal ions, some organic pollutants and exhibited antibacterial activity, silver loaded clinoptilolite seems to be a possible multifunctional reagent in the water and wastewater treatment and deserves further investigation.

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Section: Resultssupporting

confidence: 57%

Removal of Cr(VI) from wastewater by silver-loaded natural clinoptilolite

Panayotova

2021

E3S Web Conf.

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“…The determined coefficients, as shown in Table S1, were ranked in the following order: Freundlich ( R 2 = 0.993–0.998) > linear model ( R 2 = 0.959–0.978) > Langmuir ( R 2 = 0.952–0.969). Therefore, it can be concluded that the adsorption of BPA onto CPC‐K and CTAC‐K was more consistent with the Freundlich model, indicating a heterogeneous adsorption process involving multiple molecular layers (Rivera et al, 2021). Furthermore, aside from the solubilization of surfactants, the interaction between BPA and the surface sites of surfactants (such as hydrogen bonding and nonpolar force) also played a significant role in the adsorption of BPA.…”

Section: Resultsmentioning

confidence: 74%

“…These attributes give them a commendable aptitude for adsorbing pollutants of cationic nature. To date, clay minerals such as montmorillonite, bentonite, and kaolin have been harnessed to eliminate heavy metal ions and dyes from wastewater (Gu et al, 2019; Rivera et al, 2021; Zhu et al, 2016). However, the hydrophilic nature of clay minerals hampers their efficacy in the treatment of hydrophobic organic pollutants (Liu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effective adsorption of bisphenol A from water using cationic surfactant‐modified natural kaolin minerals

Wang,

Ren

et al. 2023

J Surfact & Detergents

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The utilization of natural clay minerals for the adsorption of endocrine‐disrupting chemicals (EDCs) presents a cost‐effective and environmentally friendly approach. However, the hydrophilic nature of clay minerals' surface limits their efficacy in removing these hydrophobic pollutants. To overcome these limitations, this study employed two cationic surfactants, cetylpyridinium chloride (CPC) and cetyltrimethylammonium chloride (CTAC), to modify kaolin minerals to enhance their capacity to adsorb a specific type of EDCs, bisphenol A (BPA), and its analogs. The experimental results validated that the surfactant‐modified kaolin exhibited remarkable efficiency in removing BPA from water. The equilibrium adsorption capacities of CPC‐K and CTAC‐K for BPA were determined to be 11.4 mg/g (pH = 2.0–8.0) and 13.4 mg/g (pH = 2.0–6.5), respectively. Kinetic analysis revealed that the BPA adsorption followed a pseudo‐second‐order kinetic process, while isotherm analysis suggested that the BPA adsorption was better described by the Freundlich model (R2 = 0.993–0.998). The surfactant‐modified kaolin demonstrated a retention of over 70% of its initial adsorption capacity after five cycles of desorption and regeneration, further confirming its potential for recycling. Additionally, these modified adsorbents exhibited excellent compatibility in removing bisphenol analogs. These findings provide valuable insights into the practical application of surfactant‐modified clay minerals for the elimination of hydrophobic organic pollutants from water.

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“…[12][13][14][15] Zeolites are formed by silicon and aluminum tetrahedra connected by oxygen atoms, the aluminum presence in the zeolite gives origin to an unbalanced framework having as a consequence the intrinsic cationic exchange capacity but low to negligible affinity for anions. 16,17 Consequently, many approaches have been taken in the laboratory to modify NZ to increase adsorption ability of anions and adsorption capacity of cationic. [18][19][20] However, after these modified NZ (MNZ) have completed the adsorption of pollutants, their next step of treatment has not been clearly clarified.…”

Section: Introductionmentioning

confidence: 99%

Selenium in wastewater can be adsorbed by modified natural zeolite and reused in vegetable growth

Zhang

Jin

et al. 2021

Science Progress

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Modified natural zeolites (MNZ) are widely used in pollutant removal, but how to address these MNZ that have adsorbed pollutants must be considered. Selenium is an essential trace element for metabolism and is also a water pollutant. Selenium is adsorbed in the water by MNZ in this study first. Then the Brassica chinensis L. was planted in the soil which contains the MNZ loaded with selenium (MNZ-Se) to explore selenium uptake. MNZ-Se release tests in water and soil were also considered. The results showed the following: (1) The maximum adsorption capacity of MNZ for selenium is 46.90 mg/g. (2) Water release experiments of MNZ-Se showed that regardless of how the pH of the aqueous solution changes, the trend of the release of selenium from MNZ-Se in aqueous solution is not affected and first decreases before stabilizing. (3) Soil release experiments of MNZ-Se showed that the selenium content in the soil increased and reached the concentration in the standard of selenium-rich soil. Addition amount and soil pH value will affect the release ratio. The release ratio of MNZ-Se in the water was higher than that in the soil. (4) With an increase in the soil MNZ-Se content, the selenium content in the soil and B. c increases. Above all, MZN can be a good medium for water pollutant removal and soil improvement.

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Removal of chromate anions and immobilization using surfactant-modified zeolites

Cited by 12 publications

References 73 publications

Removal of Cr(VI) from wastewater by silver-loaded natural clinoptilolite

Removal of Cr(VI) from wastewater by silver-loaded natural clinoptilolite

Effective adsorption of bisphenol A from water using cationic surfactant‐modified natural kaolin minerals

Selenium in wastewater can be adsorbed by modified natural zeolite and reused in vegetable growth

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