Scholarlink

<p>A multifunctional graphene oxide–zinc oxide (GO–ZnO) nanohybrid was developed to tackle two significant challenges in wastewater treatment: the removal of malachite green (MG) and the inactivation of pathogenic microorganisms. Under optimized conditions (25 mg L<sup>−1</sup> MG, pH = 9.0, 18&#xa0;mg adsorbent, 25&#xa0;°C, 12&#xa0;min), this material achieved a remarkable 96.54% removal of MG. The adsorption process was well-described by the Langmuir isotherm (Q<sub>max</sub> = 131.91 mg g<sup>−1</sup>) and followed pseudo-second-order kinetics, indicating that the mechanism involved chemisorption through electrostatic attraction, π–π interactions, and hydrogen bonding. The process was spontaneous, endothermic, and driven by entropy changes. Notably, the nanohybrid maintained an adsorption efficiency of over 87% after four regeneration cycles, using only 1 mL of methanol per cycle. It also demonstrated robust performance in real water samples, including tap water, river water, and industrial wastewater, retaining an MG removal efficiency of over 88% despite the complexity of these matrices. In addition to its adsorption capabilities, the nanohybrid exhibited potent broad-spectrum antimicrobial activity, with minimum inhibitory concentrations (MICs) as low as 0.313&#xa0;mg mL⁻¹ against a clinical isolate of <i>Acinetobacter baumannii</i>, 0.625&#xa0;mg mL<sup>−1</sup> against <i>Escherichia coli</i> (ATCC), and 1.25&#xa0;mg mL<sup>−1</sup> against <i>Staphylococcus aureus</i> and fluconazole-resistant <i>Candida albicans</i>. This dual functionality stems from synergistic mechanisms: ROS generation mediated by ZnO and physical membrane disruption induced by GO. Overall, the ultrafast kinetics, high reusability, environmental resilience, and integrated detoxification-disinfection capabilities highlight the GO–ZnO nanohybrid as a promising and sustainable solution for advanced water purification, meeting the urgent demand for multifunctional materials in hazardous contaminant management.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A multifunctional graphene oxide–ZnO nanohybrid for rapid and highly efficient malachite green adsorption and strong broad-spectrum antimicrobial activity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月4日

查看全文
  • Shayan Ebrahimi,
  • Paria Zanganeh,
  • Sadegh Nouripour-Sisakht,
  • Hamedreza Javadian,
  • Amir Babaie,
  • Raziyeh Khaleghi,
  • Arash Asfaram

摘要

A multifunctional graphene oxide–zinc oxide (GO–ZnO) nanohybrid was developed to tackle two significant challenges in wastewater treatment: the removal of malachite green (MG) and the inactivation of pathogenic microorganisms. Under optimized conditions (25 mg L−1 MG, pH = 9.0, 18 mg adsorbent, 25 °C, 12 min), this material achieved a remarkable 96.54% removal of MG. The adsorption process was well-described by the Langmuir isotherm (Qmax = 131.91 mg g−1) and followed pseudo-second-order kinetics, indicating that the mechanism involved chemisorption through electrostatic attraction, π–π interactions, and hydrogen bonding. The process was spontaneous, endothermic, and driven by entropy changes. Notably, the nanohybrid maintained an adsorption efficiency of over 87% after four regeneration cycles, using only 1 mL of methanol per cycle. It also demonstrated robust performance in real water samples, including tap water, river water, and industrial wastewater, retaining an MG removal efficiency of over 88% despite the complexity of these matrices. In addition to its adsorption capabilities, the nanohybrid exhibited potent broad-spectrum antimicrobial activity, with minimum inhibitory concentrations (MICs) as low as 0.313 mg mL⁻¹ against a clinical isolate of Acinetobacter baumannii, 0.625 mg mL−1 against Escherichia coli (ATCC), and 1.25 mg mL−1 against Staphylococcus aureus and fluconazole-resistant Candida albicans. This dual functionality stems from synergistic mechanisms: ROS generation mediated by ZnO and physical membrane disruption induced by GO. Overall, the ultrafast kinetics, high reusability, environmental resilience, and integrated detoxification-disinfection capabilities highlight the GO–ZnO nanohybrid as a promising and sustainable solution for advanced water purification, meeting the urgent demand for multifunctional materials in hazardous contaminant management.