Xu Wanqiang, Cai Bo, Zhang Xujie, Zhang Yating, Zhang Yongjian, Peng Hehuan
College of Optical, Mechanical and Electrical Engineering, Zhejiang A & F University, Hangzhou 311300, China.
College of Chemistry and Materials Engineering, Zhejiang A & F University, Hangzhou 311300, China.
Molecules. 2024 Nov 22;29(23):5532. doi: 10.3390/molecules29235532.
Organic pollutants, especially dyes, are seriously hazardous to the aquatic system and humans due to their toxicity, and carcinogenic or mutagenic properties. In this study, a biochar prepared from agricultural waste (pecan shells) via pyrolysis was applied to remove the dye pollutant Congo Red from wastewater to avoid a negative effect to the ecosystem. This study also investigated the effect of preparation conditions (temperature and heating rate) on the physicochemical properties and the adsorption performance of biochars. The physicochemical properties of the biochar were characterized using scanning electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The adsorption performance of the biochar was evaluated for Congo Red removal. The results showed that biochar prepared at 800 °C with a heating rate of 20 °C/min (PSC-800-20) exhibited a higher specific surface area of 450.23 m/g and a higher adsorption capacity for Congo Red (130.48 mg/g). Furthermore, adsorption experiments indicated that the pseudo-second-order and Langmuir models fitted well with the adsorption kinetics and isotherms of the biochar derived from pecan shells, respectively. Additionally, the PSC-800-20 biochar demonstrated a stable adsorption capacity over multiple cycles, suggesting its potential for regeneration and reuse in wastewater treatment applications. Therefore, the biochar derived from agricultural waste presents a promising and sustainable solution for the removal of toxic dye pollutants from wastewater.
有机污染物，尤其是染料，因其毒性、致癌性或致突变性，对水生系统和人类具有严重危害。在本研究中，通过热解由农业废弃物（山核桃壳）制备的生物炭被用于去除废水中的染料污染物刚果红，以避免对生态系统产生负面影响。本研究还考察了制备条件（温度和升温速率）对生物炭理化性质及吸附性能的影响。使用扫描电子显微镜、X射线粉末衍射、傅里叶变换红外光谱和X射线光电子能谱对生物炭的理化性质进行了表征。对生物炭去除刚果红的吸附性能进行了评估。结果表明，在800℃、升温速率为20℃/min条件下制备的生物炭（PSC - 800 - 20）具有较高的比表面积，为450.23 m²/g，对刚果红具有较高的吸附容量（130.48 mg/g）。此外，吸附实验表明，准二级模型和朗缪尔模型分别很好地拟合了山核桃壳衍生生物炭的吸附动力学和等温线。此外，PSC - 800 - 20生物炭在多个循环中表现出稳定的吸附容量，表明其在废水处理应用中具有再生和再利用的潜力。因此，农业废弃物衍生的生物炭为去除废水中有毒染料污染物提供了一种有前景的可持续解决方案。
