Application of Nanoscale Zero‐Valent Iron‐Loaded Natural Zeolite for Tetracycline Removal Process

Chitosan was dispersed on bentonite for the preparation of a Cd2+ adsorbent. The adsorption process followed a Freundlich isotherm, and the experimental adsorption capacity was determined. For understanding the adsorption mechanism, the pristine and Cd‐doped adsorbents were analyzed by Fourier transform infrared and X‐ray photoelectron spectroscopy. A red shift of the band corresponding to amino groups was observed, while the Cd 3d binding energy declined. Furthermore, density functional theory calculation results indicated that Cd2+ bonded with amino and hydroxyl groups in chitosan. The zeta potential of the adsorbent was lower than that of the support bentonite, improving the electrostatic affinity for Cd2+. The synergy between electrostatic and coordination interactions contributed to the adsorption capacity.

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“…where K F is a dimensionless coefficient proportional to the quantity of Cd 2+ adsorbed 24. The symbol n denotes the heterogeneity factor 23, 25.…”

Section: Methodsmentioning

confidence: 99%

Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions

Huang

Xie

et al. 2021

Chem Eng & Technol

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“…This value is significantly higher compared with previous reports in the literature for the adsorption of TC. For example, it was reported an adsorption capacity of ~255 mg/g for zeolitic imidazolate framework nanoparticles/polyacrylonitrile nanofibers membrane (ZIF/PAN) [42], ~150 mg/g for zero-valent iron/natural zeolites [58] and ~200 mg/g for Fe-doped Synthetic zeolite 13X [59]. Additionally, for unmodified clinoptilolite and Fe 3 O 4 /Clinoptilolite powders, a maximum adsorption capacity of 20.17 and 180.9 mg/g, respectively, have been reported for TC removal [60].…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…The zwitterion is the only sorptive species in the pH range of 5.50-7.50. It is preferably adsorbed onto the zeolite surface through cation exchange between TCH 2 + − species and positive sites in the zeolite framework (i.e., Na + ) [58,63]. In addition, hydrogen bonding between ionized TC molecules and surface silanol groups has been reported as a possible adsorption route, as well as the interaction of Lewis acid sites of zeolites with the adsorbate [64].…”

Section: Effect Of Ph and Reusingmentioning

confidence: 99%

Adsorption of Methylene Blue and Tetracycline by Zeolites Immobilized on a PBAT Electrospun Membrane

et al. 2022

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The detection of emerging contaminants in bodies of water has steadily increased in recent years, becoming a severe problem threatening human and ecosystem health. Developing new materials with adsorption properties to remove these pollutants represents an important step toward a potential solution. In this paper, a polybutylene adipate terephthalate (PBAT) nanofibrous membrane incorporating clinoptilolite zeolite was developed and its excellent performance in removing tetracycline (TC) and methylene blue (MB) from water was demonstrated. The composite membrane was prepared in two steps: firstly, a homogeneous dispersion of clinoptilolite (1 wt% respect to polymer) in a PBAT solution (12.6 wt%) was electrospun; secondly, the electrospun membrane was subjected to an acid treatment that improved its wettability through the protonation of the surface silanol groups of clinoptilolite. The resulting membrane was hydrophilic and showed higher adsorption for TC (800 mg/g) and MB (100 mg/g), using a low dose (90 mg/L) powdered zeolite. The maximum removal capacity was obtained at neutral pH, being the cation exchange reaction the main adsorption mechanism. Pseudo-second-order kinetics and Henry’s law agree well with the proposed chemisorption and the high affinity of TC and MB for the adsorbent. The material can be reused after the removal process without generating additional contamination, although losing some effectivity.

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“…However, these materials suffered from some insufficiencies: (1) LDHs and clays exhibit slow sorption kinetics and limited selectivity; (2) ACs and carbonaceous materials possess disadvantages of small pore volumes or pore sizes; (3) GO and CNTs are complicated to synthesize and produce; (4) the poor regeneration and reusability of organic resins; and (5) relatively low chemical and thermal stability of LMS. 147 Novel nanomaterials, such as polymer adsorbents, 148 2D MXenes, 149 , 150 , 151 , 152 , 153 nanoscale zero-valent iron (NZVI), 154 , 155 , 156 , 157 , 158 , 159 g-C 3 N 4 , 120 , 160 , 161 , 162 , 163 , 164 MOFs, 165 , 166 , 167 , 168 and COFs, 169 , 170 , 171 are constantly applied to improve their applications in environmental pollution cleanup owing to their superior performance. MOFs and COFs represent porous crystalline materials for network topology.…”

Section: Introductionmentioning

confidence: 99%

Orderly Porous Covalent Organic Frameworks-based Materials: Superior Adsorbents for Pollutants Removal from Aqueous Solutions

et al. 2021

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Summary Covalent organic frameworks (COFs) are a new type of crystalline porous polymers known for chemical stability, excellent structural regularity, robust framework, and inherent porosity, making them promising materials for capturing various types of pollutants from aqueous solutions. This review thoroughly presents the recent progress and advances of COFs and COF-based materials as superior adsorbents for the efficient removal of toxic heavy metal ions, radionuclides, and organic pollutants. Information about the interaction mechanisms between various pollutants and COF-based materials are summarized from the macroscopic and microscopic standpoints, including batch experiments, theoretical calculations, and advanced spectroscopy analysis. The adsorption properties of various COF-based materials are assessed and compared with other widely used adsorbents. Several commonly used strategies to enhance COF-based materials’ adsorption performance and the relationship between structural property and sorption ability are also discussed. Finally, a summary and perspective on the opportunities and challenges of COFs and COF-based materials are proposed to provide some inspiring information on designing and fabricating COFs and COF-based materials for environmental pollution management.

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Application of Nanoscale Zero‐Valent Iron‐Loaded Natural Zeolite for Tetracycline Removal Process

Cited by 15 publications

References 43 publications

Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions

Adsorption Mechanism of Bentonite with Dispersed Chitosan for Cadmium Ions

Adsorption of Methylene Blue and Tetracycline by Zeolites Immobilized on a PBAT Electrospun Membrane

Orderly Porous Covalent Organic Frameworks-based Materials: Superior Adsorbents for Pollutants Removal from Aqueous Solutions

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