Bassi Akshara, Qanungo Kushal, Hasan Imran, Alshayiqi Alanoud Abdullah, Ababtain Alanood Sulaiman, Alharthi Fahad A
Environmental Research Lab, Department of Chemistry, Chandigarh University, Mohali 140413, India.
Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Polymers (Basel). 2023 Jan 21;15(3):553. doi: 10.3390/polym15030553.
The contamination of water is increasing day by day due to the increase of urbanization and population. Textile industries contribute to this by discarding their waste directly into water streams without proper treatment. A recent study explores the treatment potential of copper oxide nanorods (CuO NRs) synthesized on a green basis in the presence of a biopolymer matrix of agar (AA) and alginate (Alg), in terms of cost effectiveness and environmental impact. The synthesized bio nanocomposite (BNC) was characterized by using different instrumental techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), ultra-violet spectroscopy (UV-Vis), scanning electron microscopy-energy dispersive X-ray-elemental analysis (SEM-EDX), transmission electron microscopy (TEM), selected area diffraction pattern (SAED) and X-ray photoelectron spectroscopy (XPS). The optical studies revealed that immobilization of CuO NRs with Alg-Agar biopolymer blend resulted in an increase in light absorption capacity by decreasing the energy bandgap from 2.53 eV to 2.37 eV. The bio nanocomposite was utilized as a photocatalyst for the degradation of amaranth (AN) dye from an aquatic environment under visible light irradiation. A statistical tool known as central composite design (CCD) associated with response surface methodology (RSM) was taken into consideration to evaluate the optimized values of process variables and their synergistic effect on photocatalytic efficiency. The optimized values of process variables were found to be irradiation time (45 min), AN concentration (80 ppm), catalyst dose (20 mg), and pH (4), resulting in 95.69% of dye degradation at 95% confidence level with desirability level 1. The rate of AN degradation was best defined by pseudo-first-order reaction based on the correlation coefficient value (R2 = 0.99) suggesting the establishment of adsorption-desorption equilibrium initially at the catalyst surface then photogenerated O radicals interacting with AN molecule to mineralize them into small non-toxic entities like CO, HO. The material used has high efficiency and stability in photocatalytic degradation experiments up to four cycles of reusability.
由于城市化进程加快和人口增长，水污染日益严重。纺织行业将未经适当处理的废物直接排放到水流中，加剧了水污染。最近的一项研究探讨了在琼脂（AA）和藻酸盐（Alg）的生物聚合物基质存在下绿色合成的氧化铜纳米棒（CuO NRs）在成本效益和环境影响方面的处理潜力。通过使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、紫外光谱（UV-Vis）、扫描电子显微镜-能量色散X射线元素分析（SEM-EDX）、透射电子显微镜（TEM）、选区衍射图案（SAED）和X射线光电子能谱（XPS）等不同仪器技术对合成的生物纳米复合材料（BNC）进行了表征。光学研究表明，将CuO NRs与Alg-Agar生物聚合物共混物固定化可使光吸收能力增强，同时将能带隙从2.53 eV降低至2.37 eV。该生物纳米复合材料被用作光催化剂，在可见光照射下从水环境中降解苋菜红（AN）染料。考虑了一种与响应面方法（RSM）相关的统计工具——中心复合设计（CCD），以评估工艺变量的优化值及其对光催化效率的协同作用。发现工艺变量的优化值为照射时间（45分钟）、AN浓度（80 ppm）、催化剂剂量（20毫克）和pH值（4），在95%置信水平下，染料降解率为95.69%，可取性水平为1。基于相关系数值（R2 = 0.99），AN降解速率最好用准一级反应来定义，这表明最初在催化剂表面建立吸附-解吸平衡，然后光生O自由基与AN分子相互作用，将其矿化为CO、HO等无毒小分子。在光催化降解实验中，所使用的材料在高达四个循环的可重复使用性方面具有高效率和稳定性。
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