Insight into the role of the zeolitization process in enhancing the adsorption performance of kaolinite/diatomite geopolymer for effective retention of Sr (II) ions; batch and column studies

Salam, Mohamed Abdel; Mokhtar, Mohamed; Albukhari, Soha M.; Baamer, Doaa F.; Palmisano, Leonardo; Abukhadra, Mostafa R.

doi:10.1016/j.jenvman.2021.112984

Cited by 31 publications

(25 citation statements)

References 51 publications

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“…The treated solutions were acidified with nitric acid (2%) and the remaining As (V) concentrations were measured by inductively-coupled-plasma mass spectrometry (Perkin Elmer). The As (V) adsorption capacity (Q e ) was calculated from Equation (1).…”

Section: Adsorption Studiesmentioning

confidence: 99%

“…The previous interval represents the equilibrium point above which the actual retention of As (V) has slow rates and nearly fixed values. The equilibration was recognized as a result of the continuous occupation of BE, PN/BE, and G.Zn@PN/BE free effective sites with the adsorbed As (V) ions up to certain intervals after them there are-no or neglected remaining active sites (Figure 5A,C) [1]. The As (V) equilibration capacities of BE are 50.5 mg/g, 40.7 mg/g, and 33.6 mg/g at 20 °C, 30 °C, and 40 °C, respectively (Figure 5A).…”

Section: Retention Time Intervalmentioning

confidence: 99%

“…The recognized As (V) retention capacities of BE, PN/BE, and G.Zn@PN/BE increased significantly when testing higher concentrations of the dissolved metal, especially in low-temperature conditions (Figure 6A-C). This was assigned to predict an increase in the As (V) driving forces as dissolved ions, which enhance the contact chances between the metal ions and the retentions sites of BE, PN/BE, and G.Zn@PN/BE [1]. Such an increment in the As (V) retention capacities was observed up to the testing concen-trations of 200 mg/L for BE and 250 mg/L for PN/BE and G.Zn@PN/BE (Figure 6A-C).…”

Section: As (V) Concentrationmentioning

confidence: 99%

“…The continuous increase in the levels of toxic heavy metal ions in major water supplies and freshwater resources as a result of extensive metallurgical, industrial, and mining activities represents critical challenges for the safe future of humanity [1,2]. Such metals have high accumulation and toxicity behavior, which classifies them as hazardous pollutants for humans, animals, and aquatic organisms [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

et al. 2022

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A green ZnO@polynaniline/bentonite composite (G.Zn@PN/BE) was synthesized as an enhanced adsorbent for As (V) ions. Its adsorption properties were assessed in comparison with the integrated components of bentonite (BE) and polyaniline/bentonite (PN/BE) composites. The G.Zn@PN/BE composite achieved an As (V) retention capacity (213 mg/g) higher than BE (72.7 mg/g) and PN/BE (119.8 mg/g). The enhanced capacity of G.Zn@PN/BE was studied using classic (Langmuir) and advanced equilibrium (monolayer model of one energy) models. Considering the steric properties, the structure of G.Zn@PN/BE demonstrated a higher density of active sites (Nm = 109.8 (20 °C), 108.9 (30 °C), and 67.8 mg/g (40 °C)) than BE and PN/BE. This declared the effect of the integration process in inducing the retention capacity by increasing the quantities of the active sites. The number of adsorbed As (V) ions per site (1.76 up to 2.13) signifies the retention of two or three ions per site by a multi-ionic mechanism. The adsorption energies (from −3.07 to −3.26 kJ/mol) suggested physical retention mechanisms (hydrogen bonding and dipole bonding forces). The adsorption energy, internal energy, and free enthalpy reflected the exothermic, feasible, and spontaneous nature of the retention process. The structure is of significant As (V) uptake capacity in the existence of competitive anions or metal ions.

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Section: Adsorption Studiesmentioning

confidence: 99%

Section: Retention Time Intervalmentioning

confidence: 99%

Section: As (V) Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

et al. 2022

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“…To date, other scholars in the field have carried out many studies on the sorption of Sr by different geological disposal media, such as kaolinite [ 12 ], montmorillonite [ 13 ], granite [ 14 , 15 ], and bentonite [ 16 ]. The existing research methods are mainly mathematical models, batch adsorption tests, microscopic characterization technology, and geochemical simulation, etc.…”

Section: Introductionmentioning

confidence: 99%

A Study of Sr Sorption Behavior in Claystone from a Candidate High-Level Radioactive Waste Geological Disposal Site under the Action of FeOOH Colloids

Wang

Cai

Zuo

et al. 2022

IJERPH

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Colloids have a significant influence on the migration of nuclides in claystone, which is an important geological barrier. The sorption of strontium on claystone in the presence of FeOOH colloids was investigated in samples from the Suhongtu site, a candidate high-level radioactive waste disposal site in China. The effects of colloid amount, solid content, and pH were investigated by batch tests, and the sorption reaction mechanism was analyzed by kinetic modeling and microscopic characterization techniques. The results indicate that the sorption of Sr by claystone increased with the solids content, and the claystone had a stronger Sr sorption capacity under alkaline conditions. The Sr sorption kinetics were best described by the pseudo-first-order and pseudo-second-order models, which revealed that the progress is affected by physical diffusion and chemical sorption. Furthermore, the microscopic characterization results demonstrate that cation exchange reactions and surface complex reactions are the main sorption mechanisms for Sr sorption on claystone. Ca and Mg plasmas in claystone minerals can have cation replacement reactions with Sr, and functional groups such as -OH and [CO3]2− can have complexation reactions with Sr to adsorb Sr on the surface of the claystone. Additionally, the presence of the FeOOH colloid inhibited the sorption effect of claystone slightly. The FeOOH colloid could occupy sorption sites on the claystone surface, which reduces the activity of the functional groups and inhibits the sorption of Sr on claystone.

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A comprehensive review on sustainable clay-based geopolymers for wastewater treatment: circular economy and future outlook

Maged

El-Fattah

Kamel

et al. 2023

Environ Monit Assess

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In the present era of significant industrial development, the presence and dispersal of countless water contaminants in water bodies worldwide have rendered them unsuitable for various forms of life. Recently, the awareness of environmental sustainability for wastewater treatment has increased rapidly in quest of meeting the global water demand. Despite numerous conventional adsorbents on deck, exploring low-cost and efficient adsorbents is interesting. Clays and clays-based geopolymers are intensively used as natural, alternative, and promising adsorbents to meet the goals for combating climate change and providing low carbon, heat, and power. In this narrative work, the present review highlights the persistence of some inorganic/organic water pollutants in aquatic bodies. Moreover, it comprehensively summarizes the advancement in the strategies associated with synthesizing clays and their based geopolymers, characterization techniques, and applications in water treatment. Furthermore, the critical challenges, opportunities, and future prospective regarding the circular economy are additionally outlined. This review expounded on the ongoing research studies for leveraging these eco-friendly materials to address water decontamination. The adsorption mechanisms of clays-based geopolymers are successfully presented. Therefore, the present review is believed to deepen insights into wastewater treatment using clays and clays-based geopolymers as a groundbreaking aspect in accord with the waste-to-wealth concept toward broader sustainable development goals.

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Insight into the role of the zeolitization process in enhancing the adsorption performance of kaolinite/diatomite geopolymer for effective retention of Sr (II) ions; batch and column studies

Cited by 31 publications

References 51 publications

Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

A Study of Sr Sorption Behavior in Claystone from a Candidate High-Level Radioactive Waste Geological Disposal Site under the Action of FeOOH Colloids

A comprehensive review on sustainable clay-based geopolymers for wastewater treatment: circular economy and future outlook

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