Yousefi Mahmood, Nabizadeh Ramin, Alimohammadi Mahmood, Mohammadi Ali Akbar, Mahvi Amir Hossein
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Department of Environmental Health Engineering, Neyshabur University of Medical Sciences, Neyshabur, Iran.
MethodsX. 2018 Dec 18;6:35-42. doi: 10.1016/j.mex.2018.12.010. eCollection 2019.
Response surface methodology has been used to design experiments and to optimize the effect of independent variables responsible for higher adsorption of humic acid (HA) by granular ferric hydroxide (GFH) from aqueous solutions. The variables of pH (3-11), contact time (15-120 min), adsorbent dose (1-5 g/L) and initial concentration of humic acid (5-20 mg/L) were examined. The adsorption isotherms and kinetics of humic acid substances on granular ferric hydroxide (GFH) were studied. Also the design of the experiments was performed using R software by the CCD (central composite design) method. Variance analysis (ANOVA) was used as the statistical response analysis method. Result of this study proved the optimal values of the independent variables of the adsorbent dose, contact time, initial concentration of humic acid and pH were 4 g/L, 93.75 min, 16.25 mg/L, and 5, respectively. The experimental data followed the Langmuir isotherm and pseudo-second kinetic model. Based on the response surface methodology, higher HA removal efficiencies were obtained with acidic condition, longer reaction time, and appropriated loading amount of GFH.
响应面法已被用于设计实验，并优化负责从水溶液中通过颗粒氢氧化铁（GFH）更高吸附腐殖酸（HA）的自变量的影响。考察了pH值（3 - 11）、接触时间（15 - 120分钟）、吸附剂剂量（1 - 5克/升）和腐殖酸初始浓度（5 - 20毫克/升）等变量。研究了腐殖酸物质在颗粒氢氧化铁（GFH）上的吸附等温线和动力学。此外，实验设计是使用R软件通过中心复合设计（CCD）方法进行的。方差分析（ANOVA）用作统计响应分析方法。本研究结果证明，吸附剂剂量、接触时间、腐殖酸初始浓度和pH值等自变量的最佳值分别为4克/升、93.75分钟、16.25毫克/升和5。实验数据符合朗缪尔等温线和伪二级动力学模型。基于响应面法，在酸性条件、较长反应时间和适当的GFH负载量下可获得更高的HA去除效率。
