Abstract In this study, activated carbon/chitosan/Carica papaya seeds (CHASPAC) composite was prepared by coating chitosan (CH) with activated carbon (AC) and Carica papaya seeds (ASP). The composite was characterized by IRFT, XRD, ATD/DTG and SEM, and then used as adsorbent for methylene blue (MB). Kinetic studies revealed that the pseudo-second-order and Elovich models were better described the adsorption process than the pseudo-first-order kinetic model. The equilibrium data were best agreeing with the Langmuir isotherm. The maximum adsorption capacity of CHASPAC 302.01 mg g−1 at pH=8 and at 30°C was higher than 93.97, 196.36 and 233.74 mg g−1 determined for CH, AC and ASP respectively. Thermodynamic study indicated favorable and spontaneous process with enthalpy 1.217 kJ mol−1 and entropy 132.544 J mol−1 K−1, suggesting endothermic process and increase in disorder at solid-liquid interface. Regeneration study of composite revealed the adsorption efficiency greater than 90% after five adsorption/desorption cycles attempted, hence, CHASPAC composite has a great reuse potential and could be used as efficient adsorbent for dyes removal from wastewater.

中文翻译：

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活性炭/壳聚糖/番木瓜种子复合物的制备以高效吸附水溶液中的阳离子染料

摘要 本研究采用活性炭（AC）和番木瓜种子（ASP）包覆壳聚糖（CH）制备活性炭/壳聚糖/番木瓜种子（CHASPAC）复合材料。该复合材料通过IRFT、XRD、ATD/DTG和SEM进行表征，然后用作亚甲基蓝(MB)的吸附剂。动力学研究表明，伪二级和 Elovich 模型比拟一级动力学模型更好地描述了吸附过程。平衡数据最符合朗缪尔等温线。CHASPAC 302.01 mg g-1 在 pH=8 和 30°C 下的最大吸附容量分别高于 CH、AC 和 ASP 测定的 93.97、196.36 和 233.74 mg g-1。热力学研究表明有利的自发过程，焓为 1.217 kJ mol-1，熵为 132.544 J mol-1 K-1，表明吸热过程和固液界面无序增加。复合材料的再生研究表明，在尝试五个吸附/解吸循环后，吸附效率大于 90%，因此，CHASPAC 复合材料具有很大的再利用潜力，可用作去除废水中染料的有效吸附剂。