Pb(II) Adsorption of Composite Alginate Beads Containing Mesoporous Natural Zeolite

Munkhbat, Dolgormaa; Ganbold, Tamiraa; Naranbaatar, Ariunzul; Shiomori, Koichiro; Bayanjargal, Ochirkhuyag

doi:10.1166/jnn.2020.18530

Cited by 6 publications

(4 citation statements)

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“…Nowadays, affected by the global population growth and water shortage, more and more methods are applied to the treatment of phosphorus-containing wastewater, including chemical methods [9], biological methods [10], and adsorption methods [11]. Removal of chemical phosphorus removal requires a large amount of chemical reagents, and a large amount of chemical sludge is produced, which is not easy to clean and can easily cause secondary pollution, limiting its popularity [12].…”

Section: Introductionmentioning

confidence: 99%

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Shi

Xiong

et al. 2023

Adsorption Science & Technology

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Inorganic modified green mudstone (MGM) was prepared from the green mudstone (GM) residue of Fushun West Open Pit Mine and characterized by XRF, XRD, FTIR, and SEM of GM and MGM. According to the calculation of pore size and the BET equation, the pore size and specific surface area of the MGM were larger. The results of adsorption kinetics and isothermal adsorption experiments showed that the adsorption capacity of MGM for phosphate increased from 0.1 mg/g to 0.71 mg/g, which was obviously better than that of GM. The GM and MGM accorded with the quasi-second-order kinetic model. The isothermal adsorption data of GM accorded with the Freundlich model, and the isothermal data of MGM accorded with the Langmuir model, which indicated that the model of GM and MGM was an adsorption process from a double layer to a single layer. Thermodynamic data showed that the increase in temperature was beneficial to the adsorption of MGM. The internal diffusion model showed that due to the change of pore size structure after modification, the number of adsorption sites that could provide phosphate was increased, and at the same time, the change of internal elements led to the extension of the chemical reaction time by 700 min. Because of the ligand exchange and electrostatic interaction between phosphate, GM, and MGM, the adsorption results showed that acidity was better than alkalinity. To improve the recycling ability of MGM, hydrochloric acid with a concentration of 0.1 mol/L was determined as the best phosphorus resolving agent, and the resolving rate was still close to 80% after five cycles. The results showed that the MGM could be a promising adsorbent for the removal of phosphorus, providing a new way for resource utilization of mining waste residue.

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Section: Introductionmentioning

confidence: 99%

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Shi

Xiong

et al. 2023

Adsorption Science & Technology

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“…The adsorption properties of the zeolite-bead composite material and modified zeolite obtained from the Tsagaantsav deposit for Pb(II) and Cr(VI) were investigated [31,32]. However, studies are lacking on the Cu(II) adsorption properties of modified zeolites of Mongolia.…”

Section: Introductionmentioning

confidence: 99%

A Natural Zeolite Developed with 3-Aminopropyltriethoxysilane and Adsorption of Cu(II) from Aqueous Media

et al. 2022

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In this work, we removed copper (II) from an aqueous solution by using zeolite modified with a silicon-organic monomer (3-aminopropyltriethoxysilane; APTES) depending on the pH, time, temperature, and initial concentration of Cu(II) ions. To confirm the modification process and assess the interaction between the modified zeolite and Cu(II), we performed instrumental analyses (XRD, SEM/EDX, TGA/DTA, BET, FT-IR, and XPS). We determined the maximum adsorption capacities of the modified zeolite for Cu(II) to be 4.50, 6.244, 6.96, and 20.66 mg/g at T = 25 °C (pH = 5, t = 8 h) when the initial concentrations of Cu(II) were 50, 100, 200, and 400 mg/L, respectively. According to the adsorption thermodynamics and kinetics, the second-order reaction controls the adsorption process. Based on the two isotherm models (Langmuir and Freundlich) with constant values (KL = 0.144, n = 2.764) and the correlation coefficients (R2 = 0.8946, R2 = 0.9216), we concluded that the Cu(II) adsorption onto the modified zeolite could be followed by the Freundlich isotherm model rather than the Langmuir isotherm model. The modified zeolite could be an effective material for the removal of Cu(II) from aqueous solutions.

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“…Physical and chemical adsorptions can take place on the zeolite crystal surface [7]. Regeneration of the zeolite has to be considered after the adsorption process [8][9][10]. Therefore, the adsorption mechanism research is conducted when using this kind of material.…”

Section: Introductionmentioning

confidence: 99%

“…However, this small structure takes less time than bulk zeolite. Moreover, the ratio of Si/Al atoms plays important role in [10].…”

Section: Introductionmentioning

confidence: 99%

First-Principles Study of Adsorption of Hazardous Atoms on the Silica Surface

Ganbaatar¹,

Tsogbadrakh²,

Baynjargal³

et al. 2021

Atlantis Highlights in Chemistry and Pharmaceutical Sciences

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In this study, the adsorption of hazardous atoms including lead on the silica surface (SiO2 [001]) was investigated using the first-principles method within the framework of density functional theory (DFT). We performed the full structural optimization and found the most stable configuration. Four different sites were considered for the surface of silica, as well as four different sites for the surface of silica with an Al atom, and the adsorption energy along with the equilibrium geometry was determined. When the absorption energy was calculated at the four positions, the surface of silica and the surface of silica with Al had the same higher absorption at the first site (-6.66 eV and -9.11 eV). The value of the absorption energy indicates that a strong chemical bond has been formed between the lead and the surface. The maximum values for the absorption energy of the lead atoms were -6.93 eV for the silica surface and -9.11 eV for the silica surface with the Al atom. Furthermore, the structure added by aluminum with the ratio of 1:5 to build a similar structure of a zeolite crystal. Which provided more absorption energy. The value of the absorption energy indicates that a strong chemical bond has been formed between the lead and the surface. The density of state (DOS) is shown that the bandgap was 2.78 eV for the silica surface and 2.65 eV for the silica surface with Al atoms. The addition of the lead atom reduced the width of the bandgap due to the creation of a trapping layer within the bandgap.

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Pb(II) Adsorption of Composite Alginate Beads Containing Mesoporous Natural Zeolite

Cited by 6 publications

References 0 publications

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

Study on Phosphorus Adsorption Performance of Inorganic Modified Green Mudstone

A Natural Zeolite Developed with 3-Aminopropyltriethoxysilane and Adsorption of Cu(II) from Aqueous Media

First-Principles Study of Adsorption of Hazardous Atoms on the Silica Surface

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