One-step synthesis of TiO2@MWCNT by plasma reactor for wastewater purification

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-04-16 DOI:10.1016/j.matchemphys.2025.130892

M. El-khatib , Awatif Rashed Z. Almotairy , Bassma H. Elwakil , Seham Sater Alhelaify , Eman Fayad , Keshav Raj Paudel , Hanadi A. Katouah , Ahmed M. Eldrieny

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Abstract

The contamination of water resources by the textile dyeing industry, organic waste, and agricultural residue has become a significant global environmental crisis, highlighting the urgent issue of water pollution. On the other hand, electrical discharge machining (EDM) is a prevalent method to synthesize Titanium alloy (an important alloy with exceptional physicochemical and thermo-mechanical characteristics). Hence, in the present study, EDM was used to synthesize titanium-based carbon nanocomposite TiO₂@MWCNT as a remediation tool for wastewater treatment. Transmission electron microscope (TEM), X-ray diffraction (XRD), stability via zeta potential, Ultra-violet (UV) and Fourier Transform Infrared (FTIR) analysis, polycrystalline and elemental identification, and optical characteristics were used to study the geometry and architecture phase of the prepared nanocomposite. According to the TEM images, all nanoparticles were hexagonal with less than 20 nm, the crystallite size was less than 2 nm and surrounded by graphene nanosheets. FTIR peaks recorded in the range of 461–501 and 542 cm⁻¹ confirmed the formation of Ti–C vibrational mode, and the zeta potential was −25 mV, indicating the nanoparticles' high stability. MB dye was examined by UV spectroscopy, and a high absorbance peak at 660 nm was found. Dye remediation studies revealed that the greatest percentage of dye elimination (79 %) was achieved by raising the contact duration between the prepared TiO₂@MWCNT and the wastewater to 90 min. Furthermore, the proportion of dye elimination increased quickly (up to 1 g/100 mL), fitting with the Langmuir adsorption isotherm model. TiO₂@MWCNT nano adsorbents exhibited good adsorptive activity even after 5 adsorption and desorption cycles. Moreover, TiO₂@MWCNT's antibacterial activity was found to be concentration-dependent with bactericidal effect through bacterial cell lysis and deformation. In conclusion, the prepared TiO₂@MWCNT can be used as an effective, stable, and reusable tool for wastewater treatment.

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等离子体反应器一步合成TiO2@MWCNT用于废水净化

纺织印染业、有机废物和农业残留物对水资源的污染已成为全球重大环境危机，凸显了水污染问题的紧迫性。另一方面，放电加工（EDM）是合成钛合金（一种具有特殊物理化学和热机械特性的重要合金）的常用方法。因此，本研究采用电火花加工合成钛基碳纳米复合材料 TiO2@MWCNT，作为废水处理的补救工具。本研究利用透射电子显微镜（TEM）、X 射线衍射（XRD）、ZETA 电位稳定性、紫外线（UV）和傅立叶变换红外（FTIR）分析、多晶和元素鉴定以及光学特性来研究制备的纳米复合材料的几何形状和结构相。根据 TEM 图像，所有纳米粒子均呈小于 20 nm 的六边形，晶粒尺寸小于 2 nm，并被石墨烯纳米片包围。在 461-501 和 542 cm-1 范围内记录的傅立叶变换红外峰证实了 Ti-C 振荡模式的形成，ZETA 电位为 -25 mV，表明纳米颗粒具有很高的稳定性。用紫外光谱检测了 MB 染料，发现在 660 纳米处有一个高吸光度峰。染料修复研究表明，将制备的 TiO2@MWCNT 与废水的接触时间延长至 90 分钟，染料去除率最高（79%）。此外，染料去除比例增加很快（达 1 克/100 毫升），符合朗缪尔吸附等温线模型。TiO2@MWCNT 纳米吸附剂在经过 5 次吸附和解吸循环后仍表现出良好的吸附活性。此外，还发现 TiO2@MWCNT 的抗菌活性与浓度有关，通过细菌细胞裂解和变形产生杀菌效果。总之，制备的 TiO2@MWCNT 可作为一种有效、稳定和可重复使用的废水处理工具。

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.