Abstract

Carbon aerogel powder and polyaniline/carbon aerogel nanocomposites have been used for the remediation of Acid Green 25 (AG25), an anionic dye. Polyaniline/carbon aerogel nanocomposites have been synthesized via in situ polymerization. The AG25 adsorption study was done by involving different parameters. i.e., pH, initial dye concentration, time, adsorbent loading, and temperature. The characterization of carbon aerogel (CA) and polyaniline/carbon aerogel (PANI/CA) was done by Fourier-transform infrared spectroscopy, field emission scanning electron microscopy , BET, and X-ray diffraction techniques. All the experiments were performed at neutral pH =7. For all concentrations studied (50 − 300 mg/L) of AG25, removal by using CA was more than 99% at all temperatures in a short time. At the initial adsorption stage, the AG25 removal rate by CA was very fast, i.e., more than 98% in 1 min. The removal with PANI/CA was 95.98% to 99.28% (50 mg/L) in 60 min period. CA showed better adsorption of AG25 than PANI/CA. The best description of the adsorption equilibrium for AG25 on CA was with two models Langmuir and Freundlich. For PANI/CA, the data fit was best described by the Langmuir model and suggesting monolayer adsorption. The highest adsorption capacity of 518 mg/g was obtained for AG25 onto CA. The pseudo-second-order model has well defined the kinetics of AG25 onto carbon aerogel and polyaniline/carbon aerogel. The present study demonstrated the high efficiency of the carbon aerogel adsorbent for textile wastewater treatment.

摘要

碳气凝胶粉末和聚苯胺/碳气凝胶纳米复合材料已用于修复酸性绿 25 (AG25)，一种阴离子染料。原位合成聚苯胺/碳气凝胶纳米复合材料聚合。AG25 吸附研究是通过涉及不同的参数来完成的。即，pH、初始染料浓度、时间、吸附剂负载和温度。通过傅里叶变换红外光谱、场发射扫描电子显微镜、BET 和 X 射线衍射技术对碳气凝胶 (CA) 和聚苯胺/碳气凝胶 (PANI/CA) 进行了表征。所有实验均在中性 pH = 7 下进行。对于所研究的所有浓度 (50 - 300 mg/L) 的 AG25，在所有温度下短时间内使用 CA 的去除率均超过 99%。在初始吸附阶段，CA 对 AG25 的去除率非常快，即在 1 分钟内达到 98% 以上。PANI/CA 在 60 分钟内的去除率为 95.98% 至 99.28% (50 mg/L)。CA对AG25的吸附比PANI/CA好。AG25 在 CA 上的吸附平衡的最佳描述是使用 Langmuir 和 Freundlich 两个模型。对于 PANI/CA，Langmuir 模型最好地描述了数据拟合，并表明单层吸附。AG25 在 CA 上的最高吸附容量为 518 mg/g。准二级模型很好地定义了 AG25 在碳气凝胶和聚苯胺/碳气凝胶上的动力学。本研究证明了碳气凝胶吸附剂在纺织废水处理中的高效性。准二级模型很好地定义了 AG25 在碳气凝胶和聚苯胺/碳气凝胶上的动力学。本研究证明了碳气凝胶吸附剂在纺织废水处理中的高效性。准二级模型很好地定义了 AG25 在碳气凝胶和聚苯胺/碳气凝胶上的动力学。本研究证明了碳气凝胶吸附剂在纺织废水处理中的高效性。