Ezeonuegbu Blessing Amaka, Machido Dauda Abdulahi, Whong Clement M Z, Japhet Wisdom Sohunago, Alexiou Athanasios, Elazab Sara T, Qusty Naeem, Yaro Clement Ameh, Batiha Gaber El-Saber
Department of Microbiology, Ahmadu Bello University, Zaria, Nigeria.
Department of Botany, Ahmadu Bello University, Zaria, Nigeria.
Biotechnol Rep (Amst). 2021 Mar 26;30:e00614. doi: 10.1016/j.btre.2021.e00614. eCollection 2021 Jun.
The aim of this study was to evaluate the removal of Pb (II) and Ni (II) from untreated waste water using sugarcane bagasse and possible desorption of the metal ions from the adsorbent for effective re-use. The effects of pH (4-6), temperature (30-70 °C), contact time (30-150 min) and adsorbent dosage (0.3-0.7 g) were examined. Optimum conditions for the removal efficiencies of Pb (89.31 %) and Ni (96.33 %) were pH, 6.0; temperature, 30 °C; contact time, 90 min. and adsorbent dosage, 0.5 g. The maximum monolayer adsorption capacities of Pb (II) and Ni (II) were 1.61 mg/g and 123.46 mg/g respectively, by fitting the equilibrium data to the Langmuir isotherm model. Freundlich isotherm and pseudo second order kinetic models were best fitted for Pb (II) and Ni (II) uptake. Desorption of the metal ions from the metal-loaded bagasse was best performed by HNO with removal efficiency of 85.2 %. Therefore, sugarcane bagasse has a high potential for removal of heavy metals from waste water and can be re-used at any time after desorption without losing its efficiency.
本研究的目的是评估利用甘蔗渣从未经处理的废水中去除Pb(II)和Ni(II)以及金属离子从吸附剂上的可能解吸，以便有效再利用。研究了pH值（4 - 6）、温度（30 - 70°C）、接触时间（30 - 150分钟）和吸附剂用量（0.3 - 0.7克）的影响。Pb（去除率89.31%）和Ni（去除率96.33%）去除效率的最佳条件为：pH值6.0；温度30°C；接触时间90分钟；吸附剂用量0.5克。通过将平衡数据拟合到朗缪尔等温线模型，Pb(II)和Ni(II)的最大单层吸附容量分别为1.61毫克/克和123.46毫克/克。Freundlich等温线和伪二级动力学模型最适合Pb(II)和Ni(II)的吸附。用HNO对负载金属的甘蔗渣进行金属离子解吸效果最佳，去除效率为85.2%。因此，甘蔗渣具有从废水中去除重金属的巨大潜力，并且在解吸后可随时再利用而不损失其效率。
