This study reports solution combustion synthesis of magnesia nanoparticles (nMgO) using magnesium nitrate as oxidiser and glycerol as fuel. Size, morphology, crystal structure and surface properties of synthesised nMgO were analysed by PXRD, SEM, TEM, FTIR and Point of Zero Charge. The XRD pattern of nMgO confirmed prepared samples were single cubic-phase without any impurities. TEM analysis proved nMgO was in nano regime with an average particle diameter of 20–40 nm. FTIR spectra show the presence of characteristic peaks of nMgO and support the XRD results. The prepared nMgO was employed as an adsorbent for the removal of two anionic dyes viz. Indigo Carmine (IC) and Orange G (OG). Furthermore, various adsorption isotherms and kinetic models were performed to understand the kinetics and mechanism of the adsorption process. Experimental results demonstrated that the adsorption equilibrium data fit well to Sips isotherm (R²>0.98) and the saturated adsorption capacities of nMgO were found to be 262 mg g⁻¹ for IC and 126 mg g⁻¹ for OG. Adsorption kinetics analysis revealed that the adsorption followed pseudo-first-order model, with both film and pore diffusion governing the rate of adsorption. Excellent adsorption capacity combined with efficient regeneration proved the potential of the prepared nMgO as an adsorbent for the removal of harmful dyes from industrial effluent.

这项研究报告了使用硝酸镁作为氧化剂和甘油作为燃料的氧化镁纳米颗粒（nMgO）的溶液燃烧合成。通过PXRD，SEM，TEM，FTIR和零电荷点分析了合成的nMgO的尺寸，形貌，晶体结构和表面性质。nMgO确认的制备样品的XRD图谱为单一立方相，没有任何杂质。TEM分析证明，nMgO处于纳米状态，平均粒径为20-40 nm。FTIR光谱显示了nMgO的特征峰的存在并支持XRD结果。所制备的nMgO用作吸附剂，用于去除两种阴离子染料。靛红色胭脂红（IC）和橙色G（OG）。此外，进行了各种吸附等温线和动力学模型，以了解吸附过程的动力学和机理。² > 0.98），发现nMgO的饱和吸附容量对IC为262 mg g ^-1，对OG为126 mg g ^-1。吸附动力学分析表明，吸附遵循伪一级模型，膜和孔的扩散均决定了吸附速率。出色的吸附能力与有效再生相结合证明了所制备的nMgO作为吸附剂从工业废水中去除有害染料的潜力。