Isa Norain, Osman Mohamed Syazwan, Abdul Hamid Haslinda, Inderan Vicinisvarri, Lockman Zainovia
Centre for Chemical Engineering Studies, Universiti Teknologi MARA, Pulau Pinang, Malaysia.
Department of Applied Sciences, Universiti Teknologi MARA, Pulau Pinang, Malaysia.
Int J Phytoremediation. 2023;25(5):658-669. doi: 10.1080/15226514.2022.2099345. Epub 2022 Jul 20.
This study describes the synthesis of silver nanoparticles (AgNPs) using shortleaf spikesedge extract (SSE) to reduce AgNO. Visual observation, in addition to analyses of UV-vis, EDX, XRD, FTIR, and TEM was employed to monitor the formation of AgNPs. The effects of SSE concentration, AgNO concentration, reaction time, pH, and temperature on the synthesis of AgNPs were studied based on the surface plasmon resonance (SPR) band. From the TEM image, highly-scattered AgNPs of quasi-spherical shape with an average particle size of 17.64 nm, were observed. For the catalytic study, the reduction of methylene blue (MB) was evaluated using two systems. A detailed batch study of the removal efficiency (%RE) and kinetics was done at an ambient temperature, various MB initial concentrations, and varying reaction time. Employing the electron relay effect in System 2, the batch study clearly highlighted the significant role of AgNPs in boosting the catalytic activity for MB removal. At 30-100 mg/L initial concentrations, MB was reduced by 100% in a very short reaction time between 1.5 and 5.0 mins. The kinetic data best fitted the pseudo-first-order model with a maximum reaction rate of 2.5715 min. These findings suggest the promising application of AgNPs in dye wastewater treatment.The SSE-driven AgNPs were prepared using unwanted dried biomass of shortleaf spikesedge extract (SSE) as a reducing as well as stabilizing agent. Employing the electron relay effect, the batch study clearly highlighted the significant role of SSE-driven AgNPs in boosting the catalytic activity for MB removal. At 30-100 mg/L initial concentrations, MB was reduced by 100% in a very short reaction time between 1.5 and 5.0 mins. In this sense, SSE-driven AgNPs acted as an electron relay point that behaves alternatively as acceptor and donor of electrons. The findings revealed the good catalytic performance of SSE-driven AgNPS, proving their viability for dye wastewater treatment.
本研究描述了使用矮叶莎草提取物（SSE）还原硝酸银来合成银纳米颗粒（AgNPs）的过程。除了对紫外可见光谱、能谱分析（EDX）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和透射电子显微镜（TEM）进行分析外，还通过目视观察来监测AgNPs的形成。基于表面等离子体共振（SPR）带，研究了SSE浓度、硝酸银浓度、反应时间、pH值和温度对AgNPs合成的影响。从TEM图像中观察到，AgNPs呈高度分散的准球形，平均粒径为17.64纳米。对于催化研究，使用两个系统评估亚甲基蓝（MB）的还原情况。在环境温度、不同的MB初始浓度和不同的反应时间下，对去除效率（%RE）和动力学进行了详细的批次研究。在系统2中利用电子中继效应，批次研究清楚地突出了AgNPs在提高MB去除催化活性方面的重要作用。在30 - 100毫克/升的初始浓度下，MB在1.5至5.0分钟的非常短的反应时间内被100%还原。动力学数据最符合伪一级模型，最大反应速率为2.5715分钟。这些发现表明AgNPs在染料废水处理中具有广阔的应用前景。由SSE驱动的AgNPs是使用矮叶莎草提取物（SSE）不需要的干燥生物质作为还原剂和稳定剂制备的。利用电子中继效应，批次研究清楚地突出了由SSE驱动的AgNPs在提高MB去除催化活性方面的重要作用。在30 - 100毫克/升的初始浓度下，MB在1.5至5.0分钟的非常短的反应时间内被100%还原。从这个意义上说，由SSE驱动的AgNPs充当了一个电子中继点，交替地作为电子的受体和供体。研究结果揭示了由SSE驱动的AgNPS具有良好的催化性能，证明了它们在染料废水处理中的可行性。
