Wei Tingting, Wu Liang, Yu Feng, Lv Yin, Chen Long, Shi Yulin, Dai Bin
Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University Shihezi 832003 P. R. China
Chongqing Daxin Pharmaceutical Co., Ltd Chongqing 400714 P. R. China.
RSC Adv. 2018 Nov 26;8(69):39334-39340. doi: 10.1039/c8ra07424k. eCollection 2018 Nov 23.
In this work, we introduce a simple and effective method for the controlled release of dye from dye saturation flocs by a well-designed pH responsive chitosan-based flocculant. The dye flocculation capacities could be precisely controlled from 0.5 to 2 g g by simply adjusting the pH of the desorption solution. A series of flocs with different dye flocculation capacities was prepared and used as nitrogen-rich precursors to prepare nitrogen-doped carbon materials through one-step carbonization. The results demonstrate that the specific surface areas, pore structures and supercapacitance performance of the resulting N-doped carbon materials could be readily controlled by varying the dye flocculation capacity. By using a dye sludge floc with an appropriate dye flocculation capacity (1.5 g g) as a precursor, the resulting N-doped material exhibited a high specific capacity and good cycling performance for a supercapacitor electrode. The unique pH-responsive properties of the chitosan-based flocculant facilitated easy tuning of the surface cationic degree and deprotonation behavior by varying pH. This work presents a new concept for balancing between environmental capacity and energy capacity using a smart pH-responsive carrier system based on modified chitosan, which is highly promising for the recycling of industrial wastewater to produce energy materials.
在这项工作中，我们介绍了一种简单有效的方法，通过精心设计的基于壳聚糖的pH响应型絮凝剂，实现染料从染料饱和絮凝物中的可控释放。通过简单调节解吸溶液的pH值，染料絮凝能力可在0.5至2 g/g之间精确控制。制备了一系列具有不同染料絮凝能力的絮凝物，并将其用作富氮前驱体，通过一步碳化制备氮掺杂碳材料。结果表明，通过改变染料絮凝能力，可以很容易地控制所得氮掺杂碳材料的比表面积、孔结构和超级电容性能。以具有适当染料絮凝能力（1.5 g/g）的染料污泥絮凝物为前驱体，所得氮掺杂材料作为超级电容器电极表现出高比容量和良好的循环性能。基于壳聚糖的絮凝剂独特的pH响应特性，通过改变pH值便于调节表面阳离子度和去质子化行为。这项工作提出了一个新的概念，即利用基于改性壳聚糖的智能pH响应载体系统在环境容量和能量容量之间取得平衡，这对于工业废水回收生产能源材料极具前景。
