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首页> 外文期刊>The Canadian Journal of Chemical Engineering >ADSORPTION ISOTHERMS, KINETICS AND MECHANISM OF PB(II) IONS REMOVAL FROM AQUEOUS SOLUTION USING CHEMICALLY MODIFIED AGRICULTURAL WASTE
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ADSORPTION ISOTHERMS, KINETICS AND MECHANISM OF PB(II) IONS REMOVAL FROM AQUEOUS SOLUTION USING CHEMICALLY MODIFIED AGRICULTURAL WASTE

机译：化学修饰的农业废料从水溶液中去除PB（II）离子的吸附等温线，动力学和机理

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The removal of Pb(II) ions from aqueous solution by chemically surface modified Strychnos potatorum seeds (SMSP) was investigated. The surface modification of the adsorbent was confirmed by the FTIR and SEM analyses. The Freundlich adsorption isotherm model provides a better fit to the adsorption isotherm data. The maximum adsorption capacity of SMSP for Pb(II) ions was found to be 166.67 mg/g at optimum conditions of pH 5.0, contact time of 30 min, SMSP dosage of 2 g/L and temperature of 30°C. The adsorption kinetics for Pb(II) ions removal by the SMSP follows the pseudo-second order kinetic model. Adsorption mechanism of Pb(II) ions onto the SMSP was explained with the intraparticle diffusion, Boyd kinetic and Shrinking core models (SCM). The effective diffusivity values were calculated from the Boyd kinetic model: 7.723 × 10~(-12), 8.464 × 10~(-12), 6.877 × 10~(-12), 8.358 × 10~(-12) and 6.983 × 10~(-12) m~2/s for the initial Pb(II) ions concentration from 100 to 500mg/L, respectively. The diffusivity values were estimated from the SCM: 8.901 × 10~(-9), 8.586 × 10~(-9), 8.359 × 10~(-9), 5.368 × 10~(-9) and 4.318 × 10~(-9) m~2/s for the initial Pb(II) ions concentration from 100 to 500 mg/L, respectively. The results suggest that SMSP can be used as an effective low-cost adsorbent for the Pb(II) ions removal.
机译：研究了通过化学表面改性的马兜铃种子（SMSP）从水溶液中去除Pb（II）离子的方法。通过FTIR和SEM分析证实了吸附剂的表面改性。 Freundlich吸附等温线模型可以更好地拟合吸附等温线数据。在pH 5.0的最佳条件，30分钟的接触时间，2 g / L的SMSP剂量和30°C的温度下，SMSP对Pb（II）离子的最大吸附能力为166.67 mg / g。 SMSP去除Pb（II）离子的吸附动力学遵循伪二级动力学模型。用粒子内扩散，Boyd动力学和收缩核心模型（SCM）解释了Pb（II）离子在SMSP上的吸附机理。根据博伊德动力学模型计算出有效扩散系数值：7.723×10〜（-12），8.464×10〜（-12），6.877×10〜（-12），8.358×10〜（-12）和6.983×初始Pb（II）离子浓度从100至500mg / L分别为10〜（-12）m〜2 / s。根据SCM估算扩散系数：8.901×10〜（-9），8.586×10〜（-9），8.359×10〜（-9），5.368×10〜（-9）和4.318×10〜（ -9）m〜2 / s的初始Pb（II）离子浓度分别为100至500 mg / L。结果表明，SMSP可以用作去除Pb（II）离子的有效低成本吸附剂。

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