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Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.scitotenv.2020.138535 Mingyue Chen 1 , Shuying Nong 1 , Yantao Zhao 1 , Muhammad Sohail Riaz 1 , Yi Xiao 1 , Maxim S Molokeev 2 , Fuqiang Huang 3
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-08 , DOI: 10.1016/j.scitotenv.2020.138535 Mingyue Chen 1 , Shuying Nong 1 , Yantao Zhao 1 , Muhammad Sohail Riaz 1 , Yi Xiao 1 , Maxim S Molokeev 2 , Fuqiang Huang 3
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Zeolite is a characteristic material for removing heavy metals exhibiting by low tolerance quantities. It is particularly desirable although challenging to cultivate an unmodified and reusable zeolite for eradicating heavy metals with great capacity. Herein, we sought out and firstly synthesized the uniform octahedral zeolite Na6Al6Si10O32·12H2O for heavy metal ions trap, proven extraordinarily effective decontamination of M2+ (Pb2+, Cd2+, Cu2+, and Zn2+). The maximum capacities of Pb2+, Cd2+, Cu2+, and Zn2+ were 649, 210, 90 and 88 mg/g, and the distribution coefficients (Kd) was ~108 mL/g for Pb2+ which emphasized the superior effectiveness of Na6Al6Si10O32·12H2O contrasted with other zeolites. Rapid adsorption was observed that Pb2+ concentration (7.5 ppm) was reduced to 0.6 ppb in 2 min. The removal mechanism was ascribed to the ion exchange and hydroxyl groups thereby affording high adsorption capacity. We also investigated the heavy metal removal of zeolite 13X and 4A for comparison and concluded the determining factor affecting absorption capacity. The removal rate of Pb remained at 97% even after five regeneration recycles. The zeolite was therefore promising for practical water purification and industrialization.
中文翻译：
可再生的P型沸石，可出色地吸收重金属：等温线，动力学和机理。
沸石是用于除去低容许量的重金属的特征材料。特别令人希望的是，尽管要培养出未改性的和可重复使用的沸石以消除高容量的重金属是有挑战性的。在这里，我们寻找并首先合成了用于重金属离子阱的均匀八面体沸石Na6Al6Si10O32·12H2O，证明了对M2 +（Pb2 +，Cd2 +，Cu2 +和Zn2 +）的超强去污效果。Pb2 +，Cd2 +，Cu2 +和Zn2 +的最大容量分别为649、210、90和88 mg / g，Pb2 +的分布系数（Kd）为〜108 mL / g，这与Na6Al6Si10O32·12H2O相比具有突出的优越性。其他沸石。观察到快速吸附，在2分钟内Pb2 +浓度（7.5 ppm）降至0.6 ppb。去除机理归因于离子交换和羟基，从而提供了高吸附能力。我们还研究了13X和4A沸石对重金属的去除以进行比较，并得出了影响吸收容量的决定性因素。即使经过五次再生循环，Pb的去除率仍保持在97％。因此，该沸石有望用于实际的水净化和工业化。
更新日期：2020-04-08
中文翻译：
可再生的P型沸石，可出色地吸收重金属：等温线，动力学和机理。
沸石是用于除去低容许量的重金属的特征材料。特别令人希望的是，尽管要培养出未改性的和可重复使用的沸石以消除高容量的重金属是有挑战性的。在这里，我们寻找并首先合成了用于重金属离子阱的均匀八面体沸石Na6Al6Si10O32·12H2O，证明了对M2 +（Pb2 +，Cd2 +，Cu2 +和Zn2 +）的超强去污效果。Pb2 +，Cd2 +，Cu2 +和Zn2 +的最大容量分别为649、210、90和88 mg / g，Pb2 +的分布系数（Kd）为〜108 mL / g，这与Na6Al6Si10O32·12H2O相比具有突出的优越性。其他沸石。观察到快速吸附，在2分钟内Pb2 +浓度（7.5 ppm）降至0.6 ppb。去除机理归因于离子交换和羟基，从而提供了高吸附能力。我们还研究了13X和4A沸石对重金属的去除以进行比较，并得出了影响吸收容量的决定性因素。即使经过五次再生循环，Pb的去除率仍保持在97％。因此，该沸石有望用于实际的水净化和工业化。
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