Department of Environmental Chemistry, Jiwaji University, Gwalior, 474011, India.
Environ Sci Pollut Res Int. 2013 Mar;20(3):1493-502. doi: 10.1007/s11356-012-0994-x. Epub 2012 Jun 12.
The presence of dyes in water is undesirable due to the toxicological impact of their entrance into the food chain. Owing to the recalcitrant nature of dyes to biological oxidation, a tertiary treatment like adsorption is required. In the present study, unsaturated polyester resin (UPR) has been used as a sorbent in the treatment of dye-contaminated water. Different concentrations of Tropaeoline 000 containing water were treated with UPR. The preliminary investigations were carried out by batch adsorption to examine the effects of pH, adsorbate concentration, adsorbent dosage, contact time, and temperature. A plausible mechanism for the ongoing adsorption process and thermodynamic parameters have also been obtained from Langmuir and Freundlich adsorption isotherm models. Thermodynamic parameter showed that the sorption process of Tropaeoline 000 onto activated carbon (AC) and UPR were feasible, spontaneous, and endothermic under studied conditions. The estimated values for (ΔG) are -10.48 × 10(3) and -6.098 × 10(3) kJ mol(-1) over AC and UPR at 303 K (30 °C), indicating towards a spontaneous process. The adsorption process followed pseudo-first-order model. The mass transfer property of the sorption process was studied using Lagergren pseudo-first-order kinetic models. The values of % removal and k (ad) for dye systems were calculated at different temperatures (303-323 K). The mechanism of the adsorption process was determined from the intraparticle diffusion model.
水中染料的存在是不理想的，因为它们进入食物链会产生毒理学影响。由于染料对生物氧化具有难降解性，因此需要进行三级处理，如吸附。在本研究中，不饱和聚酯树脂（UPR）被用作处理染料污染水的吸附剂。用 UPR 处理了不同浓度的含有 Tropaeoline 000 的水。通过批量吸附进行了初步研究，以检查 pH、吸附物浓度、吸附剂用量、接触时间和温度的影响。还从 Langmuir 和 Freundlich 吸附等温线模型获得了正在进行的吸附过程的合理机制和热力学参数。热力学参数表明，在研究条件下，Tropaeoline 000 吸附到活性炭（AC）和 UPR 上的吸附过程是可行的、自发的和吸热的。在 303 K（30°C）下，对于 AC 和 UPR，(ΔG)的估计值分别为-10.48×10(3)和-6.098×10(3)kJ mol(-1)，表明这是一个自发过程。吸附过程遵循拟一级动力学模型。使用 Lagergren 拟一级动力学模型研究了吸附过程的传质性质。在不同温度（303-323 K）下计算了染料体系的去除率和 k（ad）。从内扩散模型确定了吸附过程的机理。
