Iqhrammullah Muhammad, Saleha Sitti, Maulina Fandini Putri, Idroes Rinaldi
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Kopelma Darussalam, Banda Aceh 23111, Indonesia.
Graduate School of Mathematics and Applied Sciences, Universitas Syiah Kuala, Kopelma Darussalam, Banda Aceh 23111, Indonesia.
Heliyon. 2020 Aug 19;6(8):e04590. doi: 10.1016/j.heliyon.2020.e04590. eCollection 2020 Aug.
This research offers a novel approach of free chemical preparation to obtain algae-based biopolyol through a ball milling method. The algae-based polyurethane (AlgPU) film was obtained from a casting solution made of ball-milled algal polyol particle and methylene diphenyl diisocyanate (MDI). The characteristics of the material had been investigated using Fourier Transform Infrared, Scanning Electron Microscopy - Electron Dispersive Spectroscopy, Differential Scanning Calorimetry, and Tensile Strength Analysis. The surface area was determined by Brunauer-Emmett-Teller (BET) isotherm, meanwhile the total pore volume was by Barrett-Joyner-Halenda (BJH) isotherm, based on the adsorption-desorption of N. The addition of activated carbon contributed in the increase of functional group and surface area, which were important for the NH-N removal. As a result, the adsorption capacity increased greatly after the addition of activated carbon (from 187.84 to 393.43 μg/g). The results also suggested AlgPU as a good matrix for immobilizing activated carbon filler. The adsorption shows a better fit with Langmuir isotherm model, with R = 0.97487 and root-mean-square error (RMSE) = 33.91952, compared to Freundlich isotherm model (R = 0.96477 and RMSE = 44.05388). This means the NH-N adsorption followed the assumption of homogenous and monolayer adsorption, in which the maximum adsorption was found to be 797.95 μg/g. This research suggests the potential of newly developed material for NH-N removal.
本研究提供了一种新颖的免费化学制备方法，通过球磨法获得基于藻类的生物多元醇。基于藻类的聚氨酯（AlgPU）薄膜是由球磨后的藻类多元醇颗粒和二苯基甲烷二异氰酸酯（MDI）制成的浇铸溶液制得。使用傅里叶变换红外光谱、扫描电子显微镜 - 能谱仪、差示扫描量热法和拉伸强度分析对材料的特性进行了研究。通过布鲁诺尔 - 埃米特 - 泰勒（BET）等温线测定比表面积，同时基于氮气的吸附 - 脱附，通过巴雷特 - 乔伊纳 - 哈伦达（BJH）等温线测定总孔体积。活性炭的添加有助于官能团和比表面积的增加，这对于去除NH-N很重要。结果，添加活性炭后吸附容量大幅增加（从187.84μg/g增至393.43μg/g）。结果还表明AlgPU是固定活性炭填料的良好基质。与弗伦德里希等温线模型（R = 0.96477，均方根误差（RMSE）= 44.05388）相比，该吸附与朗缪尔等温线模型拟合得更好，R = 0.97487，RMSE = 33.91952。这意味着NH-N的吸附遵循均匀单层吸附的假设，其中最大吸附量为797.95μg/g。本研究表明新开发材料在去除NH-N方面的潜力。
