Lime () is one of the most extensively exported agricultural products from Indonesia. Citric acid and ascorbic acid content from limes () is such one of the carbon-rich fruits that is a suitable source for Carbon Quantum Dots (CQDs) synthesis. CQD synthesized by relying on natural carbon precursors from lime () is a more environmentally friendly approach in the present research, CQDs in this research will be used as an addition to ZnO by hydrothermal method in order to enhance photocatalytic activity. Corresponding to the results, the presence of CQDs improves both the optical and structural properties of ZnO, which led to enhance photocatalytic activity with a degradation percentage of 98% shortly after 75 min of visible light irradiation and to each of the repeatability test cycle results showing the consistent results and with the rate constant (k) fluctuating and the specified compound's degradation percentage remains relatively constant with minor changes.

中文翻译：

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石灰（Citrus aurantifolia）绿色合成ZnO光催化剂复合碳量子点（CQD）

石灰 (Lime) 是印度尼西亚出口最广泛的农产品之一。酸橙 () 中的柠檬酸和抗坏血酸是富含碳的水果之一，是碳量子点 (CQD) 合成的合适来源。依靠石灰天然碳前体合成的CQD是目前研究中一种更加环保的方法，本研究中的CQD将通过水热法用作ZnO的添加物以增强光催化活性。与结果相对应的是，CQD 的存在改善了 ZnO 的光学和结构特性，从而增强了光催化活性，在可见光照射 75 分钟后不久，降解百分比达到 98%，并且每个重复性测试周期结果均显示结果一致，随着速率常数 (k) 的波动，指定化合物的降解百分比保持相对恒定，变化较小。