The effect of the active carbonyl groups and residual acid on the ammonia adsorption over the acid-modified activated carbon

Liu, Changming; Li, Ming; Yao, Zhiliang; Li, Yang; Zhu, Chuanqiang; Xu, Simin; Li, Junjie; Yu, Jian

doi:10.3389/fenvs.2023.976113

Cited by 2 publications

(2 citation statements)

References 47 publications

(44 reference statements)

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“…For instance, Zheng et al [ 83 ] developed fiber-form AC modified by acidic oxygen groups, which exhibited a high NH 3 adsorption capacity of 50 mg g −1 . Li et al [ 84 ] found that AC modified by HNO 3 exhibited the best NH 3 removal performance among three inorganic acid-modified ACs, with a maximum NH 3 adsorption amount of 40 mg g −1 , owing to the reduced adsorption energy caused by the co-adsorption of NH 3 with residual HNO 3 via a hydrogen bond network. More recently, Zhang et al [ 85 ] demonstrated that ordered MS functionalized with a sulfonic group (OMS-SO 3 H) exhibited ultra-high precision for NH 3 reversible adsorption and separation, benefiting from the high density of –SO 3 H superic acid sites in ordered mesochannels.…”

Section: Porous Solids For Nh 3 Adsorptionmentioning

confidence: 99%

Advanced Materials for NH3 Capture: Interaction Sites and Transport Pathways

Jiang,

Wang,

Sun

et al. 2024

Nano-Micro Lett.

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Ammonia (NH3) is a carbon-free, hydrogen-rich chemical related to global food safety, clean energy, and environmental protection. As an essential technology for meeting the requirements raised by such issues, NH3 capture has been intensively explored by researchers in both fundamental and applied fields. The four typical methods used are (1) solvent absorption by ionic liquids and their derivatives, (2) adsorption by porous solids, (3) ab-adsorption by porous liquids, and (4) membrane separation. Rooted in the development of advanced materials for NH3 capture, we conducted a coherent review of the design of different materials, mainly in the past 5 years, their interactions with NH3 molecules and construction of transport pathways, as well as the structure–property relationship, with specific examples discussed. Finally, the challenges in current research and future worthwhile directions for NH3 capture materials are proposed.

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Section: Porous Solids For Nh 3 Adsorptionmentioning

confidence: 99%

Advanced Materials for NH3 Capture: Interaction Sites and Transport Pathways

Jiang,

Wang,

Sun

et al. 2024

Nano-Micro Lett.

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“…The choice of the adsorbent plays a critical role in the process. Various adsorbent materials, including carbon-based adsorbents, − alumina, silica, , and metal-organic frameworks (MOFs), ,,− have been developed and modified to functionalized surfaces and porous structures, allowing for effective removal of NH 3 . For instance, Wang et al used the MOF MIL-53-(OH) 2 as a base material and incorporated lithium chloride within its nanopore channels to achieve high-performance heterogeneous MOF adsorbents for NH 3 capture.…”

Section: Introductionmentioning

confidence: 99%

Demethylation of Waste Alkali Lignin for Rapid and Efficient Ammonia Adsorption

Li,

et al. 2024

Ind. Eng. Chem. Res.

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Alkali lignin, a significant waste resource from the pulp and paper industry, is produced in large quantities each year, but its utilization remains limited. This study focuses on the cleavage of −OCH 3 groups attached to the aromatic ring in alkali lignin to obtain demethylated alkali lignin nanospheres (DAL-NPs) enriched with aromatic hydroxyl (Ar−OH) groups. These DAL-NPs are intended for the efficient adsorption of NH 3 . Qualitative and quantitative characterization of alkali lignin, both pre-and post-demethylation, was performed using Fourier transform infrared spectroscopy and 1 H NMR. The analysis revealed a reduction in methoxy groups and an increase in Ar−OH groups in the DAL-NPs. The NH 3 adsorption experiment demonstrated that the DAL-NPs exhibited a rapid and high adsorption capacity, reaching an NH 3 uptake capacity of 10.0 mmol g −1 within 0.42 min at 298 K and 1.0 bar. In addition, the DAL-NPs displayed superior selectivity based on the ideal adsorption solution theory for 10% NH 3 /90% N 2 (3252) and 10% NH 3 /90% CO 2 (175) at 298 K and 1.0 bar. The DAL-NPs also demonstrated reversibility and stability during 10 adsorption−desorption cycles. The DAL-NP adsorbent possesses exceptional properties, such as abundance and low cost, rapid and efficient adsorption, reversibility, and stability, making it a promising solid adsorbent for effective NH 3 adsorption in the ammonia process.

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The effect of the active carbonyl groups and residual acid on the ammonia adsorption over the acid-modified activated carbon

Abstract: 2023), The effect of the active carbonyl groups and residual acid on the ammonia adsorption over the acid-modified activated carbon.

Cited by 2 publications

References 47 publications

Advanced Materials for NH3 Capture: Interaction Sites and Transport Pathways

Advanced Materials for NH3 Capture: Interaction Sites and Transport Pathways

Demethylation of Waste Alkali Lignin for Rapid and Efficient Ammonia Adsorption

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