ADSORPTION OF NICKEL (II) IONS FROM SOLUTION USING SAWDUST AND MODIFIED SAWDUST

B. Olufemi, Emeka Nnanna
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Abstract

By varying adsorbate concentration, temperature, contact time, pH, and adsorbent weight, the capacity of non-modified (NM) and modified (M) sawdust adsorbents to adsorb Ni2+ ions were studied in this work. The adsorption of Ni (II) ions rose as the adsorbent weight increased but reduced as the adsorbate concentration increased. Adsorption was greatest at pH 6, with the NM and M adsorbents removing 95.09 and 96.95% of Ni2+ ions, respectively. The highly dependent nature of the percent removal on operational variables was established by employing Analysis of Variance (ANOVA) as well as the Bonferroni-Holm Posthoc statistical test relationship significance. It was discovered that the NM and M sawdust are adequate adsorbents in removing Ni2+ cations from its solution. Freundlich, Langmuir, Temkin and Dubinin Raduschkevich (DR) isotherms were applied to match the sorption data. The adsorption of the two biosorbents was best characterized by the Freundlich isotherm model. Chemisorption was suspected based on the energy values obtained from the Temkin and DR isotherms. The second order kinetics best fit both the NM and M adsorption activities. The ability to absorb Ni (II) ions is impressive.
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木屑和改性木屑对溶液中镍离子的吸附
通过改变吸附剂浓度、温度、接触时间、pH和吸附剂重量,研究了未改性(NM)和改性(M)木屑吸附剂对Ni2+离子的吸附能力。对Ni (II)离子的吸附量随吸附剂质量的增加而增加,随吸附剂浓度的增加而降低。在pH为6时吸附效果最好,NM和M吸附剂对Ni2+的去除率分别为95.09和96.95%。通过方差分析(ANOVA)和Bonferroni-Holm postthoc统计检验关系显著性,确定了去除率对操作变量的高度依赖性质。发现NM和M木屑是去除溶液中Ni2+阳离子的较好吸附剂。采用Freundlich, Langmuir, Temkin和Dubinin Raduschkevich (DR)等温线对吸附数据进行拟合。两种生物吸附剂的吸附用Freundlich等温线模型进行了最好的表征。根据从Temkin和DR等温线得到的能量值,怀疑是化学吸附。二级动力学最适合NM和M的吸附活性。吸收Ni (II)离子的能力令人印象深刻。
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21
审稿时长
6 weeks
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