This study involves the preparation of hematite/biochar (HBC) nanocomposite and its photocatalytic evaluation for methylene blue degradation. HBC material was synthesized based on carbonization of iron oxide precursor-treated Salacca skin powder. Characterization studies of the material were carried out using x-ray diffraction, scanning electron microscope-energy dispersive x-ray, transmission electron microscope, and gas sorption analysis. Dispersed Fe₂O₃ with sizes ranging from 20 to 50 nm in the nanocomposite were identified, showing a band gap energy of 2.21 eV. Results show that the material demonstrates suitable physicochemical performance for photocatalytic application. By varying the initial concentration of methylene blue, it is noted that the decolorization obeys pseudo-first-order kinetics and fits the Langmuir-Hinshelwood mechanism. The decolorization kinetics was observed to be at optimum level at pH 7, reaching this state with a catalyst dosage of 0.5 g/L. The performance of the photocatalyst was observed to be better with H₂O₂ addition, in which the decolorization efficiencies reach 99.9% for all varied initial concentrations with 1 h treatment.

这项研究涉及赤铁矿/生物炭（HBC）纳米复合材料的制备及其对亚甲基蓝降解的光催化评价。基于氧化铁前体处理过的Salacca皮肤粉末的碳化来合成HBC材料。使用X射线衍射，扫描电子显微镜-能量色散X射线，透射电子显微镜和气体吸附分析对材料进行表征研究。分散铁₂ O ₃在纳米复合材料中鉴定出具有20至50nm范围内的分子，其带隙能量为2.21eV。结果表明，该材料表现出适合光催化应用的理化性能。通过改变亚甲基蓝的初始浓度，可以注意到，脱色服从伪一级动力学，并且符合朗缪尔-欣塞尔伍德机制。观察到在pH 7时，脱色动力学处于最佳水平，催化剂用量为0.5 g / L时达到该状态。在加入H ₂ O _{2的情况下}，观察到光催化剂的性能更好，其中，经过1 h处理后，所有初始浓度的脱色效率均达到99.9％。