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.

将功能化的生物炭组装在改性沸石上，以合成新型的改性复合吸附剂。后者用于同时吸附铵和硝酸盐。应用响应表面方法（RSM）的Box-Behnken设计（BBD）来优化参数，包括原料比例，吸附剂剂量，pH和温度。化学官能团通过傅里叶变换红外吸收（FT-IR）确定。胺基团的吸收峰更强，表明官能化的吸附剂可以增强污染物的吸附。复合吸附剂有效地提高NH ₄ ⁺和NO ₃ ^-通过多孔结构重组的吸附能力，表面形态的变化以及表面官能团的进一步暴露。动力学研究结果表明，这两个NH的吸附₄ ⁺和NO ₃ ^-如下伪二阶非线性模型。Langmuir等温线模型很好地拟合了实验数据，在25°C下对硝酸盐的最大吸附容量为24.45 mg / g，对铵的最大吸附容量为24.63 mg / g。硝酸盐通过与接枝胺基的静电相互作用吸收，相反，铵的吸附主要与与Na ^+的离子交换有关。。硝酸盐和铵盐的吸附过程是自发的且放热的。吸附剂可以在NaCl和NaOH混合溶液中有效地再生，并且解吸的吸附剂具有很高的可重复使用性，并且可以有效地使用至少五个循环。因此，它具有从水环境中同时去除硝酸盐和铵盐的巨大潜力。