Synthesis of reusable graphene oxide based nickel-iron superparamagnetic nanoadsorbent from electronic waste for the removal of doxycycline in aqueous media

IF 5.4 Q2 ENGINEERING, ENVIRONMENTAL
Fahima Mojumder , Sabina Yasmin , Md Aftab Ali Shaikh , Pinaki Chowdhury , Md Humayun Kabir
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Abstract

Graphene oxide-based nickel-iron superparamagnetic nanoadsorbent (GO/Ni-Fe) was synthesized from electronic waste to effectively remove doxycycline (DXC) in aqueous media. The GO/Ni-Fe nanoadsorbent has been characterized using a number of instrumental techniques, including X-ray diffractometer, Zeta potential, Fourier transform infrared spectroscopy, elemental analyzer, vibrating sample magnetometer, transmission electron microscopy, energy dispersive x-ray, and X-ray photoelectron spectroscopy. These techniques showed that nickel-iron (Ni-Fe) nanoparticles with an average size of 4.26 nm were successfully fabricated on GO surfaces. The batch experiments were conducted under different conditions, including contact time, adsorption dosage, pH, concentration, and temperature, to determine the optimal conditions of the adsorption process. The maximum adsorption (90% removal) was established within 20 min, while the adsorbent dose was only 0.1 g/L at pH 5. The adsorption process was best fitted with the pseudo-second-order model, which suggests the interaction of doxycycline with the GO/Ni-Fe nanoadsorbent is mainly controlled by the chemisorption process. This may be due to hydrogen bonding as well as electrostatic interaction and π-π interaction between adsorbates and adsorbents. The isotherm data of the adsorption process was best fitted with Langmuir isotherm model with a maximum adsorption capacity of 13.02 mg g 1 at 25 °C, indicating that the adsorption is a monolayer adsorption to heterogeneous surfaces with electrostatic interaction. The superparamagnetic properties of GO/Ni-Fe nanoadsorbent can be easily separated by external magnetic field and regenerated with methanol washing. The findings unambiguously demonstrated that magnetically separable GO/Ni-Fe nanoadsorbent could be a good choice to remove DXC from wastewater sources.

Abstract Image

从电子垃圾中合成可重复使用的氧化石墨烯基镍铁超顺磁性纳米吸附剂,用于去除水介质中的强力霉素
利用电子废弃物合成了氧化石墨烯基镍铁超顺磁性纳米吸附剂(GO/Ni-Fe),可有效去除水介质中的强力霉素(DXC)。利用多种仪器技术对 GO/Ni-Fe 纳米吸附剂进行了表征,包括 X 射线衍射仪、Zeta 电位、傅立叶变换红外光谱、元素分析仪、振动样品磁力计、透射电子显微镜、能量色散 X 射线和 X 射线光电子能谱。这些技术表明,在 GO 表面成功制备了平均尺寸为 4.26 纳米的镍铁(Ni-Fe)纳米粒子。批量实验在不同条件下进行,包括接触时间、吸附剂量、pH 值、浓度和温度,以确定吸附过程的最佳条件。在 pH 值为 5、吸附剂剂量仅为 0.1 g/L 的条件下,多西环素在 20 分钟内达到最大吸附量(去除率为 90%)。这可能是由于吸附剂与吸附剂之间的氢键作用以及静电作用和π-π作用。吸附过程的等温线数据与 Langmuir 等温线模型的拟合效果最佳,25 ℃ 时的最大吸附容量为 13.02 mg g - 1,表明吸附是在静电作用下对异质表面的单层吸附。GO/Ni-Fe 纳米吸附剂的超顺磁性能很容易在外加磁场下分离,并通过甲醇洗涤再生。研究结果清楚地表明,磁性可分离的 GO/Ni-Fe 纳米吸附剂是去除废水中 DXC 的良好选择。
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来源期刊
Journal of hazardous materials advances
Journal of hazardous materials advances Environmental Engineering
CiteScore
4.80
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