Abstract

Recycling agricultural waste, such as corn cobs, tree cones or grape stalks, contributes to converting waste into a new resource by encouraging the development of the circular economy. In this study, colour removal efficiency of H₃PO₄ activated cypress tree cone (H₃PO₄-CTC) from Methylene Blue (MB) (C₁₆H₁₈N₃SCl) was investigated by using conventional and ultrasonic-assisted adsorption processes. The properties of the prepared H₃PO₄-CTC adsorbent were obtained by SEM-EDX and FTIR analysis, and the optimum pH and adsorbent dose effect on MB adsorption was determined. Kinetic and isotherm models were presented for conventional and ultrasonic-assisted adsorption processes under optimum conditions. The removal of MB was found favourable at conventional and ultrasonic-assisted adsorption processes. Comparing the Freundlich isotherm, the Langmuir isotherm was also found to fit the experimental data more. According to the Langmuir isotherm, qmax values were obtained as 3.87 and 4.50 mg/g, respectively, by conventional and ultrasonic-assisted adsorption processes. It was also determined that MB removal was over 90% in the first two uses of H₃PO₄-CTC. In the study, it was observed that H₃PO₄ activated cypress tree cone could be used as a low-cost adsorbent in MB adsorption, and it was also seen that MB adsorption could be increased with the ultrasonic adsorption process compared to the conventional adsorption process.

中文翻译：

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使用 H3PO4 活化柏树锥去除亚甲基蓝的常规和超声波辅助吸附工艺的比较

摘要

回收玉米芯、树锥或葡萄秆等农业废弃物，通过鼓励循环经济的发展，有助于将废弃物转化为新资源。在本研究中，采用常规和超声辅助吸附工艺研究了 H ₃ PO ₄活化柏树锥体 (H ₃ PO ₄ -CTC) 从亚甲基蓝 (MB) (C ₁₆ H ₁₈ N ₃ SCl) 中的脱色效率. 制备的H ₃ PO _4的性质通过SEM-EDX和FTIR分析得到-CTC吸附剂，确定了最佳pH和吸附剂用量对MB吸附的影响。在最佳条件下，为常规和超声波辅助吸附过程提出了动力学和等温线模型。在常规和超声辅助吸附过程中发现 MB 的去除是有利的。比较 Freundlich 等温线，还发现 Langmuir 等温线更符合实验数据。根据 Langmuir 等温线，通过常规和超声辅助吸附过程，qmax 值分别为 3.87 和 4.50 mg/g。还确定在 H ₃ PO ₄ -CTC 的前两次使用中 MB 去除率超过 90%。在研究中，观察到 H ₃ PO₄活化柏树锥可用作MB吸附中的低成本吸附剂，并且与常规吸附工艺相比，超声波吸附工艺可以增加MB吸附。