Sadeek Sadeek A, Negm Nabel A, Hefni Hassan H H, Wahab Mostafa M Abdel
Faculty of Science, Zagazig University, Zagazig, Egypt.
Petrochemicals Department, Egyptian Petroleum Research Institute, Cairo, Egypt.
Int J Biol Macromol. 2015 Nov;81:400-9. doi: 10.1016/j.ijbiomac.2015.08.031. Epub 2015 Aug 15.
Biosorption of Cu(II), Co(II) and Fe(III) ions from aqueous solutions by rice husk, palm leaf and water hyacinth was investigated as a function of initial pH, initial heavy metal ions concentration and treatment time. The adsorption process was examined by two adsorption isotherms: Langmuir and Freundlich isotherms. The experimental data of biosorption process were analyzed using pseudo-first order, pseudo-second order kinetic models. The equilibrium biosorption isotherms showed that the three studied biosorbents possess high affinity and sorption capacity for Cu(II), Co(II) and Fe(III) ions. Rice husk showed more efficiency than palm leaf and water hyacinth. Adsorption of Cu(II) and Co(II) was more efficient in alkaline medium (pH 9) than neutral medium due to the high solubility of metal ion complexes. The metal removal efficiency of each biosorbent was correlated to its chemical structure. DTA studies showed formation of metal complex between the biosorbents and the metal ions. The obtained results showed that the tested biosorbents are efficient and alternate low-cost biosorbent for removal of heavy metal ions from aqueous media.
研究了稻壳、棕榈叶和凤眼莲对水溶液中铜（II）、钴（II）和铁（III）离子的生物吸附作用，考察了初始pH值、初始重金属离子浓度和处理时间对其的影响。通过两种吸附等温线（朗缪尔等温线和弗伦德里希等温线）对吸附过程进行了研究。采用拟一级、拟二级动力学模型对生物吸附过程的实验数据进行了分析。平衡生物吸附等温线表明，所研究的三种生物吸附剂对铜（II）、钴（II）和铁（III）离子具有高亲和力和吸附容量。稻壳的效率高于棕榈叶和凤眼莲。由于金属离子络合物的高溶解度，在碱性介质（pH 9）中铜（II）和钴（II）的吸附比在中性介质中更有效。每种生物吸附剂的金属去除效率与其化学结构相关。差热分析研究表明生物吸附剂与金属离子之间形成了金属络合物。所得结果表明，所测试的生物吸附剂是从水介质中去除重金属离子的有效且低成本的替代生物吸附剂。
