Hasan Imran, Khan Rais Ahmad, Alharbi Walaa, Alharbi Khadijah H, Abu Khanjer Maymonah, Alslame Ali
Environmental Research Laboratory, Department of Chemistry, Chandigarh University Gharuan Mohali Punjab 140301 India
Department of Chemistry, College of Science, King Saud University Riyadh-11451 Kingdom of Saudi Arabia
RSC Adv. 2020 Feb 24;10(13):7898-7911. doi: 10.1039/d0ra00163e. eCollection 2020 Feb 18.
The green mechanism for the synthesis of nanoparticles and their application to the wastewater treatment is of inordinate curiosity to the research community. Herein we outline a novel method for the synthesis of silver nanoparticles a green route using alginate-guar gum blend (GG-Alg@Ag) and their application to degrade methylene blue (MB) dye. The synthesized material was characterized by FTIR, XRD, SEM-EDX, TEM, TGA-DTG, AFM, and UV-vis techniques. A combination of RSM and CCD was employed to compute the system and optimized values of various interacting parameters such as exposure time (120 min), pH (4.98), dye concentration (194 mg L), and catalyst dose (0.07 g) with a photodegradation capacity of 92.33% and desirability 1.0. The mechanism of degradation reaction was best elucidated by the pseudo-second-order model suggesting chemical deposition of MB on the GG-Alg@Ag surface through followed by the reduction mechanism in the occupancy of visible light. The optical studies indicated a value of 2.5 eV by Tauc's plot for bandgap energy ( ) for GG-Alg@Ag bionanocomposite.
纳米颗粒合成的绿色机制及其在废水处理中的应用引起了研究界的极大兴趣。在此，我们概述了一种合成银纳米颗粒的新方法——使用藻酸盐-瓜尔胶混合物（GG-Alg@Ag）的绿色途径及其在降解亚甲基蓝（MB）染料中的应用。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜-能谱仪（SEM-EDX）、透射电子显微镜（TEM）、热重-微商热重（TGA-DTG）、原子力显微镜（AFM）和紫外可见光谱（UV-vis）技术对合成材料进行了表征。采用响应曲面法（RSM）和中心复合设计（CCD）来计算系统，并优化各种相互作用参数的值，如暴露时间（120分钟）、pH值（4.98）、染料浓度（194毫克/升）和催化剂剂量（0.07克），光降解能力为92.33%，可取性为1.0。降解反应的机制最好用伪二级模型来解释，该模型表明MB通过可见光占据的还原机制化学沉积在GG-Alg@Ag表面。光学研究表明，GG-Alg@Ag生物纳米复合材料的带隙能量（ ）通过Tauc图得出的值为2.5电子伏特。
