In this paper, graphene-based nano adsorbent is designed and synthesized through the functionalization of magnetic graphene oxide by aminoguanidine (denoted AGu@mGO(R)). The graphene oxide (GO) was first fabricated from rice husk biomasses and modified Hammer's method. Then, co-precipitation of Fe²⁺ and Fe³⁺ onto GO in primary media resulted in magnetic graphene oxide (mGO), which was subsequently functionalized by aminoguanidine to form AGu@mGO(R) nanoparticles. The fabricated graphene-based nano adsorbent was characterized by several techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), dynamic light scattering (DLS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and vibrating sample magnetometer (VSM) analysis. AGu@mGO(R) efficiency was evaluated in removing chlorpyrifos, one of the most widely used pesticides from water and cucumber juice, as an actual sample. Different variables, including pH, concentration, temperature, exposure time, and amount of the adsorbent, were optimized on the efficiency of the adsorption activity of AGu@mGO(R) to obtain the most efficient pesticide removal. Isotherm, kinetic and thermodynamic of the adsorption processes were also evaluated. The chlorpyrifos desorption efficiency from AGu@mGO(R) was quantified by the HPLC-MS/MS method. The results showed the effective absorbent activity of AGu@mGO(R) on the removal of chlorpyrifos. Hence, this nonabsorbent would be used for the removal of the remained pesticide in agricultural wastewater. Additionally, the AGu@mGO(R) might be used for the quantification of pesticide residues in samples.

在本文中，通过氨基胍（表示为 AGu@mGO(R)）对磁性氧化石墨烯进行功能化，设计并合成了石墨烯基纳米吸附剂。氧化石墨烯（GO）首先由稻壳生物质和改良的 Hammer 方法制成。然后，Fe ²⁺和 Fe ³⁺共沉淀在初级介质中的 GO 上产生磁性氧化石墨烯 (mGO)，随后被氨基胍官能化以形成 AGu@mGO(R) 纳米颗粒。制备的石墨烯基纳米吸附剂通过多种技术进行表征，包括扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、原子力显微镜 (AFM)、动态光散射 (DLS)、X 射线衍射 (XRD)、傅里叶变换红外光谱 (FT-IR) 和振动样品磁强计 (VSM) 分析。AGu@mGO(R) 在去除毒死蜱（一种从水和黄瓜汁中使用最广泛的杀虫剂）作为实际样品的效率被评估。不同的变量，包括 pH、浓度、温度、暴露时间和吸附剂的量，对 AGu@mGO(R) 的吸附活性效率进行了优化，以获得最有效的农药去除效果。还评估了吸附过程的等温线、动力学和热力学。AGu@mGO的毒死蜱解吸效率通过HPLC-MS/MS方法定量。结果表明 AGu@mGO(R) 在去除毒死蜱方面具有有效的吸收活性。因此，这种非吸收剂将用于去除农业废水中残留的农药。此外，AGu@mGO(R) 可用于定量样品中的农药残留。结果表明 AGu@mGO(R) 在去除毒死蜱方面具有有效的吸收活性。因此，这种非吸收剂将用于去除农业废水中残留的农药。此外，AGu@mGO(R) 可用于定量样品中的农药残留。结果表明 AGu@mGO(R) 在去除毒死蜱方面具有有效的吸收活性。因此，这种非吸收剂将用于去除农业废水中残留的农药。此外，AGu@mGO(R) 可用于定量样品中的农药残留。