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Adsorption of Nitrate and Ammonium from Water Simultaneously Using Composite Adsorbents Constructed with Functionalized Biochar and Modified Zeolite

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Abstract

The functionalized biochar was assembled on modified zeolite to synthesize a novel modified composite adsorbent. The latter was applied to simultaneous adsorption of ammonium and nitrate. The Box–Behnken design (BBD) in response surface methodology (RSM) was applied to optimize the parameters, which included ratio of raw materials, adsorbent dose, pH, and temperature. The chemical functional groups were determined by Fourier transform infrared adsorption (FT-IR). Stronger absorption peaks of amine groups indicated that the functionalized adsorbent could enhance the adsorption of contaminants. The composite adsorbent effectively increased NH4+ and NO3 adsorption capacity by porous structure recombination, change of surface morphology and further exposure of surface functional groups. The kinetic results indicate that the adsorption of both NH4+ and NO3 follows a pseudo-second-order nonlinear model. The Langmuir isotherm model fitted well the experimental data with a maximum adsorption capacity of 24.45 mg/g for nitrate and 24.63 mg/g for ammonium at 25°C. Nitrate was absorbed by electrostatic interactions with grafted amine groups and, in contrast, the ammonium adsorption was mainly related to ion exchange with Na+. The adsorption process of both nitrate and ammonium were spontaneous and exothermic. The adsorbents can be regenerated effectively in NaCl and NaOH mixed solutions, and the desorbed adsorbents are of high reusability and can be applied effectively at least for five cycles. Therefore, it has a great potential for nitrate and ammonium simultaneous removal from water environment.

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All data generated or analyzed during this study are included in this published article and its supplementary information files.

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Funding

This work was supported by the National key research and development project (Grant No. 2019YFC0408604), Fundamental Research Funds for the National Natural Science Foundation of China (Grant No. 51679041), the Youth Program of National Natural Science Foundation of China (Grant No. 51909034), and Research project of ecological environment protection and restoration of Yangtze River in Zhoushan (SZGXZS2020068).

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Authors and Affiliations

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Contributions

Yifei Wang: writing—original draft, methodology. Xinshan Song: conceptualization, data curation. Zhongshuo Xu: validation, investigation. Wei Huang: validation, project administration. Xin Cao: funding acquisition. Jing Song: formal analysis. Xiaoyan Ge: writing—review and editing. Huaping Wang: supervision.

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Correspondence to Xinshan Song.

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This paper does not report on or involve the use of any animal or human data or tissue.

Consent to Participate and for Publication

We would like to submit the enclosed manuscript entitled “Adsorption of Nitrate and Ammonium from Water Simultaneously Using Composite Adsorbents Constructed with Functionalized Biochar and Modified Zeolite”, which we wish to be considered for publication in Water Air and Soil Pollution. Written informed consent for publication was obtained from all participants.

Competing Interests

The authors declare that they have no competing interests. I would like to declare on behalf of my coauthors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part.

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Highlights

• A novel composite adsorbent was synthesized successfully and was appropriate for nitrate and ammonium removal superior to assembly precursors.

• The synthetic adsorbent has abundant active sites, large specific surface area, and expose increased amounts of functional groups.

• Electrostatic interaction is the dominant contribution NO3- adsorption and ion exchange plays a key role for NH4+ adsorption.

• The adsorption of NO3- and NH4+ are both monolayer, spontaneous and exothermic adsorption processes.

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Wang, Y., Song, X., Xu, Z. et al. Adsorption of Nitrate and Ammonium from Water Simultaneously Using Composite Adsorbents Constructed with Functionalized Biochar and Modified Zeolite. Water Air Soil Pollut 232, 198 (2021). https://doi.org/10.1007/s11270-021-05145-9

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  • DOI: https://doi.org/10.1007/s11270-021-05145-9

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