Pre-accumulation and in-situ destruction of diclofenac by a photo-regenerable activated carbon fiber supported titanate nanotubes composite material: Intermediates, DFT calculation, and ecotoxicity

Dang, Chenyuan; Sun, Fengxin; Jiang, Huan; Huang, Taobo; Liu, Wen; Chen, Xingmin; Ji, Haodong

doi:10.1016/j.jhazmat.2020.123225

Cited by 101 publications

(35 citation statements)

References 43 publications

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“…However, for TNTs@AC composites, not only AC surface was modified by TNTs, but TNTs were attached by micro-carbon. Thus, the higher uptake of E2 by TNTs@AC than neat AC and TNTs was reached via the hydrophobic and π−π interactions contributed by modified AC and capillary condensation from the micro-carbon-modified TNTs [15,26]. Table 1 lists the fitted parameters of various isotherm models for E2 adsorption onto different materials.…”

Section: Adsorption Isotherms Of E2 By Various Materialsmentioning

confidence: 99%

“…In addition, •OH also can be derived from •O 2 − , based on Equation 14. The generated radicals and h + are charge of E2 degradation (Equations (15) and (16)), which perform the photo-regeneration for TNTs@AC under UV irradiation.…”

Section: Removal Mechanism Of E2 By Tnts@acmentioning

confidence: 99%

“…E2 + ROS → intermediates → products + CO 2 (15) E2 + h + → intermediates → products + CO 2 (16) Figure 7 proposes the E2 degradation pathway by TNTs@AC under UV irradiation. The main intermediates (IM) are detected as IM1 (m/z 287) and IM2 (m/z 335) via the hydroxyl radical attack (•OH), which is consistent with another report [5].…”

Section: Removal Mechanism Of E2 By Tnts@acmentioning

confidence: 99%

“…Adsorption, as a promising technique, due to facile operation and low-cost [10], has been developed. Especially, activated charcoals or carbons (ACs) are the most widely used/developed conventional adsorbents in the lab or field applications due to their large-scale manufacturing, high adsorption capacity, and easy-regeneration [11,12] compared with other adsorbents [13][14][15][16]. In addition, for emerging organic contaminants, ACs offer higher adsorption capacity via the specific multi-pore/channel structure and π-π interactions than inorganic adsorbents [12,17].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, for emerging organic contaminants, ACs offer higher adsorption capacity via the specific multi-pore/channel structure and π-π interactions than inorganic adsorbents [12,17]. However, regeneration of organic-laden ACs may lead to the production of secondary air or water pollution through the combustion or organic solvents [15,18], which limits the application of ACs. Then, the environmental-friendly regeneration way for organic-laden ACs is necessary and can expand the application of ACs.…”

Section: Introductionmentioning

confidence: 99%

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Removal of 17β-Estradiol by Activated Charcoal Supported Titanate Nanotubes (TNTs@AC) through Initial Adsorption and Subsequent Photo-Degradation: Intermediates, DFT calculation, and Mechanisms

Huang

Pan

et al. 2020

Water

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A low-cost composite of activated charcoal supported titanate nanotubes (TNTs@AC) was developed via the facile hydrothermal method to remove the 17β-estradiol (E2, a model of pharmaceutical and personal care products) in water matrix by initial adsorption and subsequent photo-degradation. Characterizations indicated that the modification occurred, i.e., the titanate nanotubes would be grafted onto the activated charcoal (AC) surface, and the micro-carbon could modify the tubular structure of TNTs. E2 was rapidly adsorbed onto TNTs@AC, and the uptake reached 1.87 mg/g from the dual-mode model fitting. Subsequently, the adsorbed E2 could be degraded 99.8% within 2 h under ultraviolet (UV) light irradiation. TNTs@AC was attributed with a unique hybrid structure, providing the hydrophobic effect, π−π interaction, and capillary condensation for E2 adsorption, and facilitating the electron transfer and then enhancing photocatalytic ability for E2-degradation. In addition, the removal mechanism of E2 was elucidated through the density functional theory calculation. Our study is expected to provide a promising material for environmental application.

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Section: Adsorption Isotherms Of E2 By Various Materialsmentioning

confidence: 99%

Section: Removal Mechanism Of E2 By Tnts@acmentioning

confidence: 99%