Succulent shaped CaO 3D nano flowers have been synthesized by time growth morphological evaluation from bud-to-blossom using dumped egg shells. A comparative study between commercially available calcium oxide and synthesized CaO nano flowers for adsorptive removal of used engine oil and aldol condensation was conducted. The as-synthesized nano particles were characterized by hydrodynamic particle size analyser, surface area by (BET) Brunauer-Emmett-Teller, XRD (X-ray Diffraction) for crystal structural and SEM-EDX (Scanning Electron Microscopy - Energy Dispersive X-ray) and HR-TEM (High-Resolution-Transmission Electron Microscopy) for morphological examinations. The average size distribution calculated using W-H analysis (1.28–1.38 µm) and morphological studies (1.26–1.30 µm) were in good agreement. The CaO_nsf showed higher adsorption activity for spill oil remediation by dispersion-adsorption method with an extent of separation capacity upto 18 times its weight (18.31 gg⁻¹ of CaO_nsf) in comparison to CaO_cm (8.4 gg⁻¹). The as-synthesized nano flowers displayed excellent catalytic activity for aldol condensation between acetophenone and benzaldehyde. The nano flowers comprising of succulent petals, are formed from many irregular elongated nanospheres. Higher surface area availability leads to higher catalytic activity for production of chalcone with a yield of about 76.3%. This study paves a way for development of CaO based 3D nanostructures, possessing higher adsorption efficiency for oil and an efficient catalyst for base catalysed reactions.

使用倾倒的蛋壳，通过从芽到开花的时间生长形态评估合成了多汁形状的 CaO 3D 纳米花。进行了市售氧化钙和合成的 CaO 纳米花之间的比较研究，用于吸附去除用过的发动机油和羟醛缩合。合成的纳米颗粒通过流体动力学粒度分析仪进行表征，表面积通过（BET）Brunauer-Emmett-Teller 表征，XRD（X 射线衍射）用于晶体结构和 SEM-EDX（扫描电子显微镜 - 能量色散 X 射线) 和 HR-TEM（高分辨率透射电子显微镜）用于形态学检查。使用 WH 分析 (1.28–1.38 µm) 和形态学研究 (1.26–1.30 µm) 计算的平均粒径分布非常吻合。CaO _nsf对于溢油补救由分散吸附法用的分离能力高达18倍于其重量的程度表现出较高的吸附活性（18.31 GG ^-1的CaO _NSF相比的CaO）_厘米（8.4 GG ^-1）。合成的纳米花对苯乙酮和苯甲醛之间的羟醛缩合表现出优异的催化活性。由多汁花瓣组成的纳米花由许多不规则的细长纳米球形成。更高的表面积可用性导致更高的催化活性以生产查耳酮，产率约为 76.3%。该研究为开发基于 CaO 的 3D 纳米结构铺平了道路，该结构具有更高的油吸附效率和碱催化反应的高效催化剂。