In this work, an eco-firendly biosorbent was simply fabricated via self-polymerization of polydopamine on the porous pomelo peel. The composition and morphology of the obtained polydopamine modified pomelo peel (PP-PDA) were confirmed by Fourier transform infrared, emission scanning electron microscopy and Brunauer−Emmett−Teller surface area measurements, respectively. Next, the adsorption capacity of the PP-PDA towards various anionic and cationic dyes was investigated. Interestingly, the PP-PDA exhibited high adsorption capacity towards cationic dyes with the maximum adsorption capacities of 434.78 mg/g for methylene blue, 208.33 mg/g for neutral red and 143.88 mg/g for malachite green, respectively. Due to this adsorption feature, the PP-PDA can achieve selective adsorption of cationic dyes from mixtures. Meanwhile, the adsorption kinetics and adsorption isotherms of the PP-PDA towards cationic dyes obeyed pseudo-second-order kinetic and Langmuir isotherm model, respectively. Additionally, the results presented that the adsorption capacity of the PP-PDA increased with the increment of pH value of the aqueous solution, however, its adsorption capacity decreased with increasing of the salt concentration. Most importantly, the fabricated PP-PDA could be easily regenerated, its adsorption capacity could be maintained well even after twenty cycles. Therefore, the as-prepared PP-PDA can be employed as a promising biosorbent for dye-contaminated wastewater of treatment.

在这项工作中，通过在多孔柚皮上进行聚多巴胺的自聚合，简单地制造了一种环保型生物吸附剂。分别通过傅立叶变换红外光谱，发射扫描电子显微镜和Brunauer-Emmett-Teller表面积测量来确认所获得的聚多巴胺改性柚皮（PP-PDA）的组成和形态。接下来，研究了PP-PDA对各种阴离子和阳离子染料的吸附能力。有趣的是，PP-PDA对阳离子染料表现出高吸附能力，亚甲基蓝最大吸附容量为434.78 mg / g，中性红最大吸附容量为208.33 mg / g，孔雀绿最大吸附容量为143.88 mg / g。由于这种吸附特性，PP-PDA可以从混合物中选择性吸附阳离子染料。与此同时，PP-PDA对阳离子染料的吸附动力学和吸附等温线分别服从拟二级动力学和Langmuir等温线模型。另外，结果表明PP-PDA的吸附容量随水溶液pH值的增加而增加，但其吸附容量随盐浓度的增加而降低。最重要的是，制得的PP-PDA易于再生，即使经过20个循环也可以很好地保持其吸附能力。因此，所制备的PP-PDA可以用作有前途的生物吸附剂，用于处理被染料污染的废水。结果表明，PP-PDA的吸附能力随水溶液pH值的增加而增加，但随着盐浓度的增加其吸附能力下降。最重要的是，制得的PP-PDA易于再生，即使经过20个循环也可以很好地保持其吸附能力。因此，所制备的PP-PDA可以用作有前途的生物吸附剂，用于处理被染料污染的废水。结果表明，PP-PDA的吸附能力随水溶液pH值的增加而增加，但随着盐浓度的增加其吸附能力下降。最重要的是，制得的PP-PDA易于再生，即使经过20个循环也可以很好地保持其吸附能力。因此，所制备的PP-PDA可以用作有前途的生物吸附剂，用于处理被染料污染的废水。