Environmental Materials Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur-440020, India.
Anal Methods. 2021 Nov 18;13(44):5309-5327. doi: 10.1039/d1ay01402a.
Polyaniline-iron(II) nitrate was prepared by the polymerization of aniline hydrochloride with Fe(NO). The as-prepared materials were characterized for surface area and pore volume and were used to remove the reactive orange 16 (RO16) dye from an aqueous solution. Batch studies were conducted as a function of pH (2-12), adsorbent amount (10-100 mg), initial RO16 concentration (100-300 mg L), contact time (10-240 min), and temperature (303-323 K). RO16 was removed at high speed, and equilibrium was achieved in 80 min. Langmuir (six linear forms, , L-I-VI) and other isotherm models were explored for their applicability. With the maximum adsorption capacity of 508.7267 mg g and a pH of 4 at 313 K, the adsorption isotherm could be adequately characterised using the Langmuir (L-V) model. The kinetics of the adsorption process were investigated by fitting experimental data to pseudo-second order (PSO) (type-I-VI) and other kinetic models, with the findings indicating that the adsorption closely matched the PSO-I model. For isotherm models, twelve linear error functions were investigated. The absorption process was spontaneous, endothermic, and feasible according to the thermodynamics study (Δ° = -8.8888 kJ mol, Δ° = 3.1940 kJ mol, and Δ° = 39.8749 J mol K). The phototoxicity studies revealed that the untreated dye was highly toxic compared to the treated dye. It was also shown that the material could be recycled substantially, with an RO16 value of 82.8%. The findings also indicated that the PANI/Fe(NO) material was sufficient for RO16 dye adsorption in both model and real water samples.
聚苯胺-硝酸铁是由盐酸苯胺与 Fe(NO₃)₂聚合而成的。所制备的材料进行了比表面积和孔体积的表征，并用于从水溶液中去除活性橙 16（RO16）染料。作为 pH（2-12）、吸附剂用量（10-100mg）、初始 RO16 浓度（100-300mg/L）、接触时间（10-240min）和温度（303-323K）的函数进行了批量研究。RO16 被快速去除，在 80min 内达到平衡。探索了朗缪尔（六种线性形式，、L-I-VI）和其他等温模型的适用性。在 313K 时，pH 值为 4 时，最大吸附容量为 508.7267mg/g，吸附等温线可以用朗缪尔（L-V）模型很好地描述。通过将实验数据拟合到伪二级（PSO）（类型-I-VI）和其他动力学模型来研究吸附过程的动力学，结果表明吸附过程与 PSO-I 模型非常吻合。对于等温模型，研究了十二种线性误差函数。热力学研究表明，吸附过程是自发的、吸热的和可行的（Δ°=-8.8888kJ/mol，Δ°=3.1940kJ/mol，Δ°=39.8749J/mol·K）。光毒性研究表明，未经处理的染料比处理过的染料毒性更高。还表明，该材料可以大量回收，RO16 值为 82.8%。研究结果还表明，PANI/Fe(NO₃)材料足以在模型和实际水样中吸附 RO16 染料。
