PDF(Pubmed)
Abstract：
Water pollution with heavy metals owing to industrial and agricultural activities have become a critical dilemma to humans, plants as well as the marine environment. Therefore, it is of great importance that the carcinogenic heavy metals present in wastewater to be eliminated through designing treatment technologies that can remove multiple pollutants. A novel green magnetic nano-composite called (Carbonized Chitosan-Fe3O4-SiO2) was synthesized using Co-precipitation method to adsorb a mixture of heavy metal ions included; cobalt (Co2+), nickel (Ni2+) and copper (Cu2+) ions from aqueous solutions. The novelty of this study was the synthesis of a new nano-composite which was green with magnetic properties to be more sustainable and environmentally friendly. Its magnetic properties made it separated easily from solutions after accomplishment of the adsorption process using a magnet. Extended Freundlich isotherm was the best fitted model with maximum adsorption capacity of the metal ions mixture 2908.92 mg/g. Different experimental parameters have been studied included the initial concentration for a mixture of nickel, cobalt and copper metal ions (0.05-0.1 molar), dosage of adsorbent (0.5-3.5 g/L) and contact time (6-90 min) to investigate their changing effect on the removal percents of the heavy metal ions mixture from aqueous solutions. The experimental adsorption percent of cobalt ion ranged from 1.58 to 64.28%, nickel ion adsorption percent ranged from 10.68 to 94.12% and copper ion adsorption percent ranged from 4.41 to 76.23% at pH = 9 were based on the combination of the adsorption process parameters.
摘要：
由于工业和农业活动造成的重金属污染已成为人类的关键困境，植物以及海洋环境。因此,通过设计可以去除多种污染物的处理技术，消除废水中存在的致癌重金属非常重要。使用共沉淀法合成了一种称为（碳化壳聚糖-Fe3O4-SiO2）的新型绿色磁性纳米复合材料，以吸附包含的重金属离子的混合物；钴（Co2），水溶液中的镍（Ni2）和铜（Cu2）离子。这项研究的新颖之处在于合成了一种新的纳米复合材料，该复合材料具有绿色的磁性，更加可持续和环保。它的磁性能使它在使用磁铁完成吸附过程后很容易与溶液分离。扩展Freundlich等温线是最佳拟合模型，对金属离子混合物的最大吸附容量为2908.92mg/g。已经研究了不同的实验参数，包括镍混合物的初始浓度，钴和铜金属离子（0.05-0.1摩尔），吸附剂用量（0.5-3.5g/L）和接触时间（6-90min），以研究它们对水溶液中重金属离子混合物去除百分比的变化。实验对钴离子的吸附率为1.58~64.28%,根据吸附工艺参数的组合，在pH=9时，镍离子吸附百分比为10.68至94.12％，铜离子吸附百分比为4.41至76.23％。
