Enhanced removal of Cd2+ by nano zero-valent iron modified attapulgite from aqueous solution: Optimal design，characterization and adsorption mechanism

Dai, Liang; Meng, Kai; Zhao, Wei; Han, Tao; Lei, Zhenle; Ma, Guojun; Wu, Changfeng; Jia, Huaihong

doi:10.1016/j.jece.2022.107719

Cited by 33 publications

(7 citation statements)

References 43 publications

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“…This facilitated the adsorption of Pb 2+ . The Fe-O band at 665 cm −1 became stronger after Pb 2+ adsorption, which was due to changes in the valence state of Fe 0 [20].…”

Section: Resultsmentioning

confidence: 97%

Performance and mechanisms of active attapulgite-supported sulfidated nanoscale zero-valent iron materials for Pb(II) removal from aqueous solution

Song,

Dai

2023

Mater. Res. Express

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To inhibit the oxidation, passivation, and agglomeration of nano-zero-valent iron (nZVI), a liquid phase reduction method was used to load sulfurized nZVI onto acid-modified ATP with attapulgite (ATP) as the carrier (S-nZVI@ATP). The performance and mechanism of this material were studied for Pb2+ removal in water. The S-nZVI@ATP preparation prevents the agglomeration of nZVI particles and reduces nZVI oxidation. Pb2+ removal proceeds efficiently and stably when using S-nZVI@ATP at pH values ranging from 2.5–5.5. According to the electron sharing and transfer-based pseudo-second-order kinetic model, the Pb2+ is adsorbed onto S-nZVI@ATP, and the speed control step is completed by liquid film diffusion and intraparticle diffusion. The S-nZVI@ATP mediated Pb2+ adsorption is well-described by Freundlich’s isothermal adsorption model, which is a multilayer chemical adsorption process. The temperature and initial Pb2+ concentration were varied, and it was determined that Pb2+ adsorbs on S-nZVI@ATP in an endothermic reaction. This S-nZVI@ATP composite material has high reducibility, high surface activity, and good adsorption properties for Pb2+. Tests were performed for 24 h using adsorbent (1 g l−1) in Pb2+ solution (30 ml). For an initial Pb2+ concentration of 700 mg l−1, S−1-nZVI@ATP removes 57.37% of the Pb2+ and has an adsorption capacity of 401.60 mg g−1. In addition to forming PbS and Pb(OH)2 precipitates, Pb2+ also complexes with the Fe/H oxide shell of S-nZVI@ATP, and Fe0 reduces some Pb2+ on the nZVI to Pb0. The results exhibited that S-nZVI@ATP has excellent potential as an adsorbent for the removal of Pb2+ from the industrial wastewater.

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“…This facilitated the adsorption of Pb 2+ . The Fe-O band at 665 cm −1 became stronger after Pb 2+ adsorption, which was due to changes in the valence state of Fe 0 [20].…”

Section: Resultsmentioning

confidence: 97%

Performance and mechanisms of active attapulgite-supported sulfidated nanoscale zero-valent iron materials for Pb(II) removal from aqueous solution

Song,

Dai

2023

Mater. Res. Express

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“…As shown in Table 3, the Freundlich model (R 2 , 0.8900−0.9635) showed a better simulation of 4−NP adsorption performance than the Temkin model (R 2 , 0.7932−0.8600). The values of 1/n at different temperatures lies in the range of 0.1−1, indicating adsorption was easy [47]. Furthermore, the maximum adsorption capacity q m of 4−NP calculated from the Langmuir model at 25, 35, and 45 • C was 46.63, 35.61, and 26.89 mg/g, respectively, which was higher than that of 4−NP on some adsorbents (e.g., activated carbon, 39.49 mg/g) [48].…”

Section: Adsorption Mechanism Of 4−np By Magnesium Silicatementioning

confidence: 97%

Efficient Removal of Nonylphenol Contamination from Water Using Optimized Magnesium Silicate

Zhang

Rao

et al. 2022

Materials

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Nonylphenol (NP) is considered to be an environmentally toxic, endocrine-disrupting chemical that affects humans and ecosystems. Adsorption is one of the most promising approaches for the removal of nonylphenol contamination from water. Herein, in order to design an adsorbent with high adsorption capacity, magnesium silicate with different Mg/Si ratios was successfully synthesized by a sol–gel method at 60 °C. Magnesium silicate with a Mg/Si ratio of 1:6 was found to possess the best adsorption performance, with maximum 4−NP sorption 30.84 mg/g under 25 °C and 0.2 g/L adsorbent dose. The adsorption was negatively affected by increasing adsorbent dose and temperature. The kinetics and isotherm of 4−NP adsorption by Mg/Si were well described by the pseudo−second−order and Sips model, respectively, and behavior was proven to be physisorption−enhanced by a chemical effect. Detailed characterization by XRD, BET, and SEM confirmed that the magnesium silicate possesses an amorphous, mesoporous structure. The study will contribute to the applicability of cheap magnesium silicate for removal of NP contamination in water.

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“…3 ATP modification by carbon-based materials (left) [95][96][97]101,118,119 and by metal or metal oxides (right). 109,[113][114][115]120,121 Copyright 2024, Elsevier. method (366.0 mg g −1 ) and by hydrothermal method (271.8 mg g −1 ).…”

Section: Modication Attapulgite By Carbon-based Materialsmentioning

confidence: 99%

Recent developments in synthesis of attapulgite composite materials for refractory organic wastewater treatment: a review

Zhang,

Huang,

Qiao

et al. 2024

RSC Adv.

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Enhanced removal of Cd2+ by nano zero-valent iron modified attapulgite from aqueous solution: Optimal design，characterization and adsorption mechanism

Cited by 33 publications

References 43 publications

Performance and mechanisms of active attapulgite-supported sulfidated nanoscale zero-valent iron materials for Pb(II) removal from aqueous solution

Performance and mechanisms of active attapulgite-supported sulfidated nanoscale zero-valent iron materials for Pb(II) removal from aqueous solution

Efficient Removal of Nonylphenol Contamination from Water Using Optimized Magnesium Silicate

Recent developments in synthesis of attapulgite composite materials for refractory organic wastewater treatment: a review

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