Abstract

Calcium (Ca) is one among the major essential nutrients for plant growth and development. It activates enzymes, nitrate uptake, plant biomass ratio, the rate of photosynthesis and increase metabolisms. In the present study, calcium carbonate (CaCO₃) and calcium oxide (CaO) nanoparticles were prepared using three marine molluscan shells. The elemental composition of three molluscan shells (Lima lima, Lottioidea and Oliva reticularis) was analyzed using XRF. The physico-chemical characterization of raw shell powder (CaCO₃) and CaO nanoparticles was carried out using TGA–DSC, XRD, FT-IR, HR-SEM and TEM. TGA–DSC, a major weight loss peak, has been identified for all the three shells at a temperature range of 650–850 °C indicated the formation of CaCO₃ into CaO. The average size of the CaO nanoparticles of Lima lima, Lottioidea and Oliva reticularis were determined to be 29, 32 and 25 nm, respectively. The effects on the plant growth as a nutrient source revealed that the CaO synthesized at nanoscale from all the marine molluscan shells (Lima lima, Lottioidea and Oliva reticularis) at a concentration of 250 ppm have given higher radicle growth (9.52, 7.92 and 8.12 cm), germination (100, 100 and 100%), shoot length (12.48, 12.12 and 12.40 cm), root length (13.02, 12.80 and 12.24 cm) and vigor index (2550, 2492 and 2464) then CaCO₃ and normal control. Among the marine molluscan shells, the CaCO₃ and CaO synthesized from Lima lima have effected high level of radicle growth and seed quality parameters then Lottioidea and Oliva reticularis.

Graphic Abstract

中文翻译：

---

以海洋软体动物贝壳废料为植物生长的营养源制备氧化钙纳米粒子及其表征

摘要

钙（Ca）是植物生长发育的主要必需营养素之一。它激活酶，硝酸盐吸收，植物生物量比率，光合作用速率并增加新陈代谢。在本研究中，使用三个海洋软体动物壳制备了碳酸钙（CaCO ₃）和氧化钙（CaO）纳米粒子。使用XRF分析了三个软体动物壳（利马利马，Lottiea和网状Oliva）的元素组成。原料贝壳粉（CaCO ₃的理化特性），使用TGA-DSC，XRD，FT-IR，HR-SEM和TEM进行CaO纳米颗粒的制备。TGA–DSC是一个主要的失重峰，已在650–850°C的温度范围内对所有三个壳体进行了鉴定，表明CaCO ₃形成了CaO。利马，莲蓬和网状油菜的CaO纳米颗粒的平均尺寸分别确定为29、32和25 nm。对植物生长作为营养源的影响表明，CaO是从所有海洋软体动物壳（利马利马，Lottioidea和网状Oliva网状壳）以纳米级合成的）在250 ppm的浓度下具有更高的胚根生长（9.52、7.92和8.12 cm），发芽（100、100和100％），茎长（12.48、12.12和12.40 cm），根长（13.02、12.80和12.24）厘米）和活力指数（2550、2492和2464），然后加CaCO ₃和正常对照。间海洋软体动物壳，所述的CaCO ₃和CaO从合成利马已经实现胚根生长和种子质量参数然后高水平Lottioidea和Oliva的网状。

图形摘要