Departamento de Química, Universidade Federal do Maranhão, Av. dos Portugueses s/n, 65080-040 São Luis, MA, Brazil.
Universidade Federal do Rio Grande do Norte, Cx. Postal 1664, 59078-970 Natal, RN, Brazil.
J Environ Manage. 2017 Dec 15;204(Pt 1):23-30. doi: 10.1016/j.jenvman.2017.08.033. Epub 2017 Aug 29.
In this work the efficiency of two lignocellulosic waste materials, wood residues and coconut mesocarp, were investigated as adsorbents towards two representative textile dyes (Remazol Red, RR and Remazol Brilliant Violet, RBV). The moisture, carbohydrate, protein, lipid, ash and fiber contents of both natural matrices were characterized. The materials were also characterized by infrared spectroscopy, X-ray diffractometry, scanning electron microscopy, specific surface area analysis and thermogravimetry. The adsorption of dyes was monitored by using UV-Vis spectrophotometry. It was verified that both, coconut mesocarp (CM) and wood residues can act as effective adsorbents towards the investigated dyes. It is verified that the maximum adsorption capacity Γ (mg g) for RBV and RR are 7.28 and 3.97 towards CM and 0.64 and 0.71 towrads SD. Furthermore, it was verified that the adsorption is strongly pH dependent and, as a general behavior, an increase in the pH value is associated with a decrease of the total amount of adsorbed dye. The adsorption of violet dye onto coconut mesocarp is well described by the Langmuir model, while all the remazol red fitted better with the Freundlich equation.
在这项工作中，研究了两种木质纤维素废料（木屑和椰子果肉）作为两种代表性纺织染料（雷马素红 RR 和雷马素亮紫 RBV）的吸附剂的效率。对两种天然基质的水分、碳水化合物、蛋白质、脂肪、灰分和纤维含量进行了表征。还通过红外光谱、X 射线衍射、扫描电子显微镜、比表面积分析和热重分析对材料进行了表征。通过紫外-可见分光光度法监测染料的吸附。结果表明，椰子果肉（CM）和木屑都可以作为两种研究染料的有效吸附剂。结果表明，RBV 和 RR 对 CM 的最大吸附容量Γ（mg g）分别为 7.28 和 3.97，对 SD 的分别为 0.64 和 0.71。此外，还证实吸附强烈依赖于 pH 值，通常情况下，pH 值的增加与吸附染料总量的减少有关。紫罗兰染料在椰子果肉上的吸附很好地符合朗缪尔模型，而所有雷马素红都更符合弗伦德利希方程。
