Chemical Engineering Department, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai 400019, India.
Chemical Engineering Department, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai 400019, India.
J Environ Manage. 2018 Mar 15;210:226-238. doi: 10.1016/j.jenvman.2018.01.008.
Biosorbent synthesized from dead leaves of Prunus Dulcis with chemical activation during the synthesis was applied for the removal of Acid Green 25 dye from wastewater. The obtained biosorbent was characterized using Brunauer-Emmett-Teller analysis, Fourier transform-infrared spectroscopy and scanning electron microscopy measurements. It was demonstrated that alkali treatment during the synthesis significantly increased surface area of biosorbent from 67.205 to 426.346 m/g. The effect of various operating parameters on dye removal was investigated in batch operation and optimum values of parameters were established as pH of 2, 14 g/L as the dose of natural biosorbent and 6 g/L as the dose of alkali treated biosorbent. Relative error values were determined to check fitting of obtained data to the different kinetic and isotherm models. It was established that pseudo-second order kinetic model and Langmuir isotherm fitted suitably to the obtained batch experimental data. Maximum biosorption capacity values were estimated as 22.68 and 50.79 mg/g for natural biosorbent and for alkali activated Prunus Dulcis, respectively. Adsorption was observed as endothermic and activation energy of 6.22 kJ/mol confirmed physical type of adsorption. Column experiments were also conducted to probe the effectiveness of biosorbent for practical applications in continuous operation. Breakthrough parameters were established by studying the effect of biosorbent height, flow rate of dye solution and initial dye concentration on the extent of dye removal. The maximum biosorption capacity under optimized conditions in the column operation was estimated as 28.57 mg/g. Thomas and Yoon-Nelson models were found to be suitably fitted to obtained column data. Reusability study carried out in batch and continuous column operations confirmed that synthesized biosorbent can be used repeatedly for dye removal from wastewater.
采用化学活化法合成的苦杏仁叶生物吸附剂可用于从废水中去除酸性绿 25 染料。通过比表面积分析、傅里叶变换红外光谱和扫描电子显微镜对得到的生物吸附剂进行了表征。结果表明，在合成过程中进行碱处理可使生物吸附剂的表面积从 67.205 增加到 426.346 m/g。在间歇操作中考察了各种操作参数对染料去除的影响，并确定了最佳参数值为 pH 值 2、天然生物吸附剂用量 14 g/L 和碱处理生物吸附剂用量 6 g/L。为了检查获得的数据与不同的动力学和等温线模型拟合情况，确定了相对误差值。结果表明，准二级动力学模型和 Langmuir 等温线模型适合于获得的间歇实验数据。天然生物吸附剂和碱处理苦杏仁叶的最大吸附容量值分别为 22.68 和 50.79 mg/g。吸附过程被观察为吸热过程，6.22 kJ/mol 的活化能证实了吸附的物理类型。还进行了柱实验以研究生物吸附剂在连续运行中的实际应用的有效性。通过研究生物吸附剂高度、染料溶液流速和初始染料浓度对染料去除程度的影响，确定了穿透参数。在柱操作的优化条件下，估计最大吸附容量为 28.57 mg/g。Thomas 和 Yoon-Nelson 模型被发现适合拟合获得的柱数据。在间歇和连续柱操作中的可重复使用性研究证实，合成的生物吸附剂可用于从废水中去除染料。
