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Facile Synthesis of Hydrogel-Based Ion-Exchange Resins for Nitrite/Nitrate Removal and Studies of Adsorption Behavior

Dharmapriya, Thakshila Nadeeshani, Shih, Hsin-Yin, Huang, Po-Jung·2022·Polymers
DOI 10.3390/polym14071442PMC PMC9003023
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Abstract

This research aimed to create facile, reusable, hydrogel-based anion exchange resins that have been modified with two different amines to test their ability to adsorb nitrate and nitrite in water using batch and continuous systems. In the batch experiment, maximum adsorption capacities of nitrate and nitrite onto poly (ethylene glycol) diacrylate methacryloxyethyltrimethyl ammonium chloride (PEGDA-MTAC) and poly (ethylene glycol) diacrylate 2-aminoethyl methacrylate hydrochloride (PEGDA-AMHC) adsorbents can be obtained as 13.51 and 13.16 mg NO3−-N/g sorbent; and 12.36 and 10.99 mg NO2−-N/g sorbent respectively through the Langmuir isotherm model. After 15 adsorption/desorption cycles, PEGDA-MTAC and PEGDA-AMHC retained nitrate adsorption efficiencies of 94.71% and 83.02% and nitrite adsorption efficiencies of 97.38% and 81.15% respectively. In a column experiment, modified adsorbents demonstrated adsorption efficiencies greater than 45% after being recycled five times. Proposed hydrogel-based adsorbents can be more effective than several types of carbon-based sorbents for nitrate and nitrite removal in water and have benefits such as reduced waste generation, cost-effectiveness, and a facile synthesis method.

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  • Patel et al. (2019) found that MTAC exhibited excellent removal efficiency for methylene blue dye from aqueous solutions, especially under acidic conditions.

    “Similarly, Patel et al. (2019) investigated the potential of MTAC for the removal of methylene blue dye from aqueous solutions and found that it exhibited excellent removal efficiency, especially under acidic conditions46.”

    From Performance of maize tassel activated carbon for COD removal from industrial wastewater under optimized conditions (2025) · cites this paper as [46]

    The Conclusions (page unavailable) identify this as a study of PEGDA-MTAC hydrogels for nitrate and nitrite removal, not a Patel et al. (2019) study of methylene blue dye. The Results and Discussions (page unavailable) also report that nitrate adsorption increased as pH rose from 2 to 10, rather than finding the claimed advantage under acidic conditions. (LLM, conf=0.85)

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Metadata

Authors
Dharmapriya, T. N., Shih, H.-Y., & Huang, P.-J.
Venue
Polymers
Publisher
MDPI AG
Published
2022-04-01
Volume
14
Issue
7
Pages
1442
ISSN
2073-4360
DOI
10.3390/polym14071442
PMC
PMC9003023
Cited by
40
References
1
Language
en
Licence
creativecommons.org/licenses/by/4.0/ (vor)
Funders
Ministry of Science and Technology (MOST 107-2218-E-110-018-MY3, MOST 110-2221-E-110-024)

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