Muhammad Amir, Shah Anwar-Ul-Haq Ali, Bilal Salma, Rahman Gul
Institute of Chemical Sciences, University of Peshawar, Peshawar 25120, Pakistan.
National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.
Materials (Basel). 2019 May 30;12(11):1764. doi: 10.3390/ma12111764.
Owing to its exciting physicochemical properties and doping-dedoping chemistry, polyaniline (PANI) has emerged as a potential adsorbent for removal of dyes and heavy metals from aqueous solution. Herein, we report on the synthesis of PANI composites with magnetic oxide (FeO) for efficient removal of Basic Blue 3 (BB3) dye from aqueous solution. PANI, FeO, and their composites were characterized with several techniques and subsequently applied for adsorption of BB3. Effect of contact time, initial concentration of dye, pH, and ionic strength on adsorption behavior were systematically investigated. The data obtained were fitted into Langmuir, Frundlich, Dubbanin-Rudiskavich (D-R), and Tempkin adsorption isotherm models for evaluation of adsorption parameters. Langmuir isotherm fits closely to the adsorption data with R values of 0.9788, 0.9849, and 0.9985 for FeO, PANI, and PANI/FeO composites, respectively. The maximum amount of dye adsorbed was 7.474, 47.977, and 78.13 mg/g for FeO, PANI, and PANI/FeO composites, respectively. The enhanced adsorption capability of the composites is attributed to increase in surface area and pore volume of the hybrid materials. The adsorption followed pseudo second order kinetics with R values of 0.873, 0.979, and 0.999 for FeO, PANI, and PANI/FeO composites, respectively. The activation energy, enthalpy, Gibbs free energy changes, and entropy changes were found to be 11.14, -32.84, -04.05, and -0.095 kJ/mol for FeO, 11.97, -62.93, -07.78, and -0.18 kJ/mol for PANI and 09.94, -74.26, -10.63, and -0.210 kJ/mol for PANI/FeO respectively, which indicate the spontaneous and exothermic nature of the adsorption process.
由于其令人兴奋的物理化学性质和掺杂-脱掺杂化学性质，聚苯胺（PANI）已成为一种从水溶液中去除染料和重金属的潜在吸附剂。在此，我们报告了用于从水溶液中高效去除碱性蓝3（BB3）染料的磁性氧化物（FeO）与聚苯胺复合材料的合成。用多种技术对聚苯胺、FeO及其复合材料进行了表征，并随后将其应用于BB3的吸附。系统研究了接触时间、染料初始浓度、pH值和离子强度对吸附行为的影响。将获得的数据拟合到朗缪尔、弗伦德利希、杜宾宁-鲁德斯基维奇（D-R）和坦普金吸附等温线模型中，以评估吸附参数。朗缪尔等温线与吸附数据拟合紧密，FeO、聚苯胺和聚苯胺/FeO复合材料的R值分别为0.9788、0.9849和0.9985。FeO、聚苯胺和聚苯胺/FeO复合材料对染料的最大吸附量分别为7.474、47.977和78.13 mg/g。复合材料吸附能力的增强归因于杂化材料表面积和孔体积的增加。吸附遵循准二级动力学，FeO、聚苯胺和聚苯胺/FeO复合材料的R值分别为0.873、0.979和0.999。FeO、聚苯胺和聚苯胺/FeO的活化能、焓、吉布斯自由能变化和熵变化分别为11.14、-32.84、-04.05和-0.095 kJ/mol，11.97、-62.93、-07.78和-0.18 kJ/mol，以及09.94、-74.26、-10.63和-0.210 kJ/mol，这表明吸附过程具有自发和放热的性质。
