Department of Environmental Health Engineering, Faculty of Health, Kashan University of Medical Sciences, Kashan, Iran; Students' Scientific Research Center (SSRC), Tehran University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Department of Environmental Health Engineering, School of Public Health, Alborz University of Medical Sciences, Karaj, Iran; Research Center for Health, Safety and Environment (RCHSE), Alborz University of Medical Sciences, Karaj, Iran.
Int J Biol Macromol. 2019 Jun 15;131:633-645. doi: 10.1016/j.ijbiomac.2019.03.058. Epub 2019 Mar 8.
Magnetic separation of toxic dyes has become a potential and effective method in wastewater treatments. In present research, a facile in situ one step co-precipitation synthetic approach is used to develop water-dispersible FeO/Chitosan/Glutaraldehyde nanocomposites (MCS-GA) as an efficient adsorbent for the removal of Crystal Violet (CV) from aqueous solution. The physicochemical properties of the MCS-GA were investigated using FTIR, SEM, TEM, XRD, BET, and VSM techniques. 5-level and 3-factors central composite design (CCD) combined with the response surface methodology (RSM) was applied to investigate the statistical relationships between independent variables i.e. initial pH, adsorbent dosage, initial dye concentration and adsorption process as response. The optimal values of the parameters for the best efficiency (99.99%) were as follows: pH of 11, the initial dye concentration of 60 mg L and MCS-GA dosage of 0.817 g L, respectively. The adsorption equilibrium and kinetic data were fitted with the Langmuir monolayer isotherm model (q: 105.467 mg g, R: 0.996) and pseudo-second order kinetics (R: 0.960). Thermodynamic parameters (R > 0.941, ΔH°: 690.609-896.006 kJ mol, ΔG°: -1.6849 to -13.4872 kJ mol, ΔS°: 0.168-0.232 kJ mol K) also indicated CV adsorption is feasible, spontaneous and endothermic in nature. Overall, taking into account the excellent efficiency, good regeneration and acceptable performance in real terms, MCS-GA can be introduced as a promising absorbent for dyes removal from the textile wastewater.
磁性分离有毒染料已成为废水处理中一种有潜力和有效的方法。在本研究中，采用简便的原位一步共沉淀合成方法，制备了水分散的 FeO/壳聚糖/戊二醛纳米复合材料（MCS-GA），作为一种从水溶液中去除结晶紫（CV）的有效吸附剂。采用 FTIR、SEM、TEM、XRD、BET 和 VSM 技术对 MCS-GA 的物理化学性质进行了研究。采用 5 水平 3 因素中心组合设计（CCD）结合响应面法（RSM）研究了独立变量（即初始 pH、吸附剂用量、初始染料浓度和吸附过程）与吸附过程之间的统计关系。为了获得最佳效率（99.99%），参数的最佳值如下：pH 值为 11，初始染料浓度为 60mg/L，MCS-GA 用量为 0.817g/L。吸附平衡和动力学数据分别拟合 Langmuir 单层吸附等温线模型（q：105.467mg/g，R：0.996）和准二级动力学模型（R：0.960）。热力学参数（R＞0.941，ΔH°：690.609-896.006kJ/mol，ΔG°：-1.6849 至-13.4872kJ/mol，ΔS°：0.168-0.232kJ/mol·K）也表明 CV 吸附是可行的，自发的和吸热的。总的来说，考虑到其出色的效率、良好的再生能力和实际应用中的良好性能，MCS-GA 可以作为一种从纺织废水中去除染料的有前途的吸附剂。
