Kinetic and thermodynamic aspects of Cu(II) and Cr(III) removal from aqueous solutions using rose waste biomass
Kinetic and thermodynamic aspects of Cu(II) and Cr(III) removal from aqueous solutions using rose waste biomass
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DOI：
10.1016/j.jhazmat.2008.04.040
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发表时间：
2009-01-30
影响因子：
13.6
通讯作者：
Nadeem, Razyia
中科院分区：
文献类型：
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作者：
Iftikhar, Abdur Rauf;Bhatti, Haq Nawaz;Nadeem, Razyia
玫瑰花瓣蒸馏废液用于去除水溶液中的Cu（II）和Cr（III）。结果表明，金属吸附的pH值，吸附剂剂量，吸附剂的大小，初始体积浓度，时间和温度的依赖性。发现1 g/L玫瑰废弃物生物质的剂量对于Cu（II）和Cr（III）的最大吸收是有效的。Cu（II）和Cr（III）的最佳吸附温度和pH分别为303 +/- 1 K和5。Freundlich回归模型和准二级动力学模型的相关系数较高，能较好地描述玫瑰废弃物对Cu（II）和Cr（III）的吸附。在平衡时，Cu（II）和Cr（III）的q（max）（mg/g）分别为55.79和67.34。Cu（II）和Cr（III）吸附过程的自由能变化（Δ G度）分别为-0.829 kJ/mol和-1.85 kJ/mol，这表明吸附过程的自发性质。其他热力学参数如熵变（Δ S度）、焓变（Δ H度）和活化能（Δ E）对于Cu（II）分别为0.604J mol（-1）K-1、-186.95 kJ/mol和68.53 kJ/mol，对于Cr（III）分别为0.397J mol（-1）K-1、-119.79 kJ/mol和114.45 kJ/mol。这项工作的主要新奇之处是确定最短的可能的吸附时间为Cu（II）和Cr（III）在早期的研究相比。在100 mg/L的初始浓度下，仅在前20 min内就去除了几乎超过98%的Cu（II）和Cr（III）。(C)2008 Elsevier B. V.保留所有权利。
Distillation waste of rose petals was used to remove Cu(II) and Cr(III) from aqueous solutions. The results demonstrated the dependency of metal sorption on pH, sorbent dose, sorbent size, initial bulk concentration, time and temperature. A dosage of 1 g/L of rose waste biomass was found to be effective for maximum uptake of Cu(II) and Cr(III). Optimum sorption temperature and pH for Cu(II) and Cr(III) were 303 +/- 1 K and 5, respectively. The Freundlich regression model and pseudo-second-order kinetic model were resulted in high correlation coefficients and described well the sorption of Cu(II) and Cr(Ill) on rose waste biomass. At equilibrium q(max) (mg/g) of Cu(II) and Cr(III) was 55.79 and 67.34, respectively. The free energy change (Delta G degrees) for Cu(II) and Cr(III) sorption process was found to be -0.829 kJ/mol and -1.85 kJ/mol, respectively, which indicates the spontaneous nature of sorption process. Other thermodynamic parameters such as entropy change (Delta S degrees), enthalpy (Delta H degrees)and activation energy (Delta E) were found to be 0.604J mol(-1) K-1, -186.95 kJ/mol and 68.53 kJ/mol, respectively for Cu(II) and 0.397J mol(-1) K-1, -119.79 kJ/mol and 114.45 kJ/mol, respectively for Cr(III). The main novelty of this work was the determination of shortest possible sorption time for Cu(II) and Cr(III) in comparison to earlier studies. Almost over 98% of Cu(II) and Cr(III) were removed in only first 20 min at an initial concentration of 100 mg/L. (C) 2008 Elsevier B.V. All rights reserved.