In situ ATR-FTIR spectroscopy for evidencing the adsorption mechanism of ammonium on a pinewood-derived biochar

IF 2.3 4区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agricultural & Environmental Letters Pub Date : 2023-01-06 DOI:10.1002/ael2.20097

Priya Saini, Jason P. de Koff, Sudipta Rakshit

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引用次数: 1

Abstract

Biochar is used as a soil amendment for improving soil health. Biochar is known to possess high adsorption capacity for nutrient ions, especially toward NH₄⁺. However, there is limited information regarding the direct binding mechanisms of NH₄⁺ on biochar. Although few infrared spectroscopic studies were conducted by characterizing the biochar solid phase, no research was reported, in which the adsorption mechanism was deciphered in the presence of water. Here we report NH₄⁺ adsorption mechanism on pinewood biochar using in situ attenuated total reflectance Fourier transform infrared spectroscopy. The results indicated that NH₄⁺ adsorbed strongly on pinewood biochar at pH 8.5 and less at pH 5.5 as revealed by infrared band shifts and symmetry change. Macroscopic adsorption envelope corroborated the spectroscopic finding by resulting in higher adsorption capacity with increasing pH.

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原位ATR‐FTIR光谱证明松木生物炭对铵的吸附机理

生物炭被用作土壤改良剂，以改善土壤健康。生物炭对营养离子具有较高的吸附能力，特别是对NH4+。然而，关于NH4+在生物炭上的直接结合机制的信息有限。虽然对生物炭固相进行红外光谱表征的研究较少，但尚未见有水存在时破译其吸附机理的研究报道。本文利用原位衰减全反射傅立叶变换红外光谱技术报道了松木生物炭对NH4+的吸附机理。结果表明:pH为8.5时，松木生物炭对NH4+的吸附较强，pH为5.5时吸附较弱;宏观吸附包膜随着pH值的增加而产生更高的吸附容量，证实了光谱的发现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Agricultural & Environmental Letters Multiple-

CiteScore

3.70

自引率

3.80%

发文量