Application of mesoporous magnetic carbon composite for reactive dyes removal: Process optimization using response surface methodology
Application of mesoporous magnetic carbon composite for reactive dyes removal: Process optimization using response surface methodology
复制标题
DOI：
10.1007/s11814-016-0155-x
复制
发表时间：
2016-10-01
影响因子：
2.7
通讯作者：
Takdastan, Afshin
中科院分区：
文献类型：
--
作者：
Jafari, Ahmad Jonidi;Kakavandi, Babak;Takdastan, Afshin
由于纺织废水的反应性、毒性和化学稳定性，将纺织废水排放到饮用水源中可能会危害生态系统。在这项研究中，研究了磁铁矿纳米粒子改性的粉末活性炭（PAC-MNP）作为吸附剂在间歇系统中去除活性染料（活性黑5（RB5）和活性红120（RR120））的应用。吸附性能作为温度、接触时间和不同吸附剂和吸附物浓度的函数进行评估。使用响应面方法 (RSM) 中的 Box-Behnken Design (BBD) 对因子水平进行统计优化，以最大限度地提高系统效率。两种染料的吸附过程均符合准二级动力学模型和Langmuir等温线模型。确定的最佳吸附条件分别为温度 38.7 A 摄氏度、46.3 分钟、0.8 g/L 和 102 mg/L 的温度、接触时间、吸附剂剂量和初始染料浓度。根据朗缪尔等温线，RB5 和 RR120 的最大吸附容量分别为 175.4 和 172.4 mg/g。热力学研究表明活性染料的吸附过程是自发的、可行的、吸热的。五个循环后，RB5 和 RR120 的吸附效率分别约为 84% 和 83%。获得了较高的解吸值，表明PAC-MNPs具有良好的再生和可重复使用潜力，并且可以在工业应用中有效利用。 PAC-MNP 在去除染料工业废水中的活性染料方面也表现出良好的抗干扰潜力。
Discharging the effluents of textile wastewaters into potable water resources can endanger the ecosystem, due to their reactivity, toxicity, and chemical stability. In this research, the application of powder activated carbon modified with magnetite nanoparticles (PAC-MNPs) as an adsorbent for removal of reactive dyes (Reactive black 5 (RB5) and reactive red 120 (RR120)) was studied in a batch system. The adsorption performance was evaluated as a function of temperature, contact time and different adsorbent and adsorbate concentrations. The levels of factors were statistically optimized using Box-Behnken Design (BBD) from the response surface methodology (RSM) to maximize the efficiency of the system. The adsorption process of both dyes was fit with the pseudo-second order kinetic and Langmuir isotherm models. The identified optimum conditions of adsorption were 38.7 A degrees C, 46.3 min, 0.8 g/L and 102 mg/L for temperature, contact time, adsorbent dose, and initial dyes concentration, respectively. According to the Langmuir isotherm, the maximum sorption capacities of 175.4 and 172.4 mg/g were obtained for RB5 and RR120, respectively. Thermodynamics studies indicated that the adsorption process of the reactive dyes was spontaneous, feasible, and endothermic. After five cycles, the adsorption efficiency was around 84 and 83% for RB5 and RR120, respectively. A high value of desorption was achieved, suggesting that the PAC-MNPs have a good potential in regeneration and reusability, and also can be effectively utilized in industrial applications. PAC-MNPs also show a good anti-interference potential for removal of reactive dyes in dye-industry wastewaters.