The present study aimed at enhancing the adsorption potential of novel nanocomposites of Sesbania bispinosa biochar (SBC) with copper oxide (SBC/CuO) and manganese oxide nanoparticles (SBC/MnO) for the efficient and inexpensive removal of environmentally concerned contaminant arsenic (As) from contaminated water at batch scale. The scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, energy dispersive X-ray (EDX), X-ray diffraction (XRD) and point of zero charge (PZC) analyses proved successful impregnation of the metallic nanoparticles on SBC surface. The results revealed the maximum As removal (96 %) and adsorption (12.47 mg/g) by SBC/CuO composite at 10 mg As/L, optimum pH-4, dose 1.0 g/L and ambient temperature (25 ± 1.5 °C) as compared with SBC (7.33 mg/g) and SBC/MnO (7.34 mg/g). Among four types of adsorption isotherms, Freundlich isotherm demonstrated best fit with R² > 0.997. While pseudo second-order kinetic model revealed better agreement with kinetic experimental data as matched with other kinetic models. The thermodynamic results depicted that As adsorption on the as-synthesized adsorbents was endothermic and spontaneous in nature with increased randomness. The SBC/CuO displayed excellent reusability and stability over four adsorption/desorption cycles and proved that the as-synthesized SBC/CuO composite may be the efficient adsorbent for practical removal of As from contaminated water.

本研究旨在提高Sesbania bispinosa新型纳米复合材料的吸附潜力。生物炭（SBC）与氧化铜（SBC / CuO）和氧化锰纳米颗粒（SBC / MnO）一起以批量方式从污染水中高效，廉价地去除环境相关的砷砷。扫描电子显微镜（SEM），傅立叶变换红外（FTIR）光谱，能量色散X射线（EDX），X射线衍射（XRD）和零电荷点（PZC）分析证明了将金属纳米颗粒成功浸渍在SBC上表面。结果显示，在10 mg As / L，最佳pH-4、1.0 g / L剂量和环境温度（25±1.5°C）下，SBC / CuO复合材料的最大As去除量（96％）和吸附（12.47 mg / g） ）与SBC（7.33 mg / g）和SBC / MnO（7.34 mg / g）相比。在四种吸附等温线中，Freundlich等温线显示最适合R ²> 0.997。伪二级动力学模型显示出与动力学实验数据更好的一致性，与其他动力学模型相匹配。热力学结果表明，合成后的吸附剂上的As吸附是吸热的，自然是自发的，随机性增加。SBC / CuO在四个吸附/解吸循环中显示出优异的可重复使用性和稳定性，并证明了合成后的SBC / CuO复合物可能是从污染水中实际去除As的有效吸附剂。