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首页> 外文期刊>Separation and Purification Technology >Removal and recovery of heavy metals from aqueous solution using papaya wood as a new biosorbent
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Removal and recovery of heavy metals from aqueous solution using papaya wood as a new biosorbent

机译：使用木瓜木作为新型生物吸附剂从水溶液中去除和回收重金属

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Papaya wood was evaluated as a new biosorbent of heavy metals.On contacting 10 mg 1~(-1) copper(II),cadmium(II) and zinc(II) solutions with 5 g 1~(-1) papaya wood,during shake flask contact time of 60min,the respective metal removal was noted to be 97.8,94.9 and 66.8%.Sorption was most efficient at pH 5.Metal ion biosorption increased as the ratio of metal solution to the biomass quantity decreased.Conversely,biosorption/g biosorbent decreased as the quantity of biomass increased.The increase in initial metal ion concentration was associated with steep increase in biosorption at lower concentrations,progressively reaching towards plateau at higher metal concentrations.At equilibrium,the affinity of papaya wood to biosorb metals was in the order of copper(II) > cadmium(II) > zinc(II),which remained the same during the testing of variables of different factors.The biosorption data perfectly fit the Langmuir adsorption isotherms model with 0.99 regression coefficient (r~2) for all the metals.The fit on Freundlich adsorption isotherms model was acceptable but not as good.The biosorption kinetics studies indicated that the data followed the second-order reaction with r~2 of 0.99.The first-order reaction was not applicable to the data.The metal-loaded papaya wood was completely desorbed with 0.1N HC1.During repeated biosorption-desorption for five cycles,no loss in the efficiency of copper(II) and cadmium(II) removal from their respective solutions and the metal-loaded biomass was noted.The study points to the potential of a novel use of papaya wood,itself a cause of environmental degradation and otherwise of no utility,for the treatment of wastewaters contaminated with heavy metals.
机译：木瓜木被评估为一种重金属的新型生物吸附剂。在接触过程中，将10 mg 1〜（-1）的铜（II），镉（II）和锌（II）溶液与5 g 1〜（-1）的木瓜木接触。摇瓶接触时间为60分钟，据指出，相应的金属去除率分别为97.8、94.9和66.8％。在pH为5时，吸附最有效。金属离子对生物量的比率降低时，金属离子的生物吸附量增加。随着生物量的增加，生物吸附剂减少。初始金属离子浓度的增加与较低浓度下生物吸附的急剧增加有关，在较高金属浓度下逐渐达到高原。在平衡状态下，木瓜木材对金属吸附的亲和力为铜（II）>镉（II）>锌（II）的顺序在测试不同因素的变量时保持不变。生物吸附数据与0.99回归系数（r〜2）的Langmuir吸附等温线模型完全吻合。对于所有的相遇对Freundlich吸附等温线模型的拟合是可以接受的，但效果不佳。生物吸附动力学研究表明数据遵循二阶反应，r〜2为0.99，一阶反应不适用于该数据。金属负载的木瓜木料用0.1N HCl完全解吸。在重复生物吸附-解吸五个周期期间，从各自溶液中去除铜（II）和镉（II）的效率没有损失，并且注意到金属负载的生物量研究指出了一种新用途的木瓜木材的潜力，该木瓜本身会造成环境退化，而没有其他用途，可以用于处理被重金属污染的废水。

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