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首页> 外文期刊>RSC Advances >Environmental surface chemistries and adsorption behaviors of metal cations (Fe3+, Fe2+, Ca2+ and Zn2+) on manganese dioxide-modified green biochar
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Environmental surface chemistries and adsorption behaviors of metal cations (Fe3+, Fe2+, Ca2+ and Zn2+) on manganese dioxide-modified green biochar

机译：金属阳离子（Fe3 +，Fe2 +，Ca2 +，Zn2 +）的环境表面化学和吸附行为在二氧化碳改性的绿色Biochar上

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The facile preparation and modification of low-cost/efficient adsorbents or biochar (CP) derived from the carbonization of palm kernel cake (lignocellulosic residue) has been studied for the selective adsorption of various metal cations, such as Fe ~(3+) , Fe ~(2+) , Ca ~(2+) and Zn ~(2+) , from aqueous solution. The CP surface was modified with KMnO _(4) (CPMn) and HNO _(3) (CPHNO _(3) ) in order to improve the adsorption efficiency. The physicochemical properties of the as-prepared adsorbents were investigated via BET, pH _(pzc) , FT-IR, Boehm titration, TG-DTG, XRD and SEM-EDS techniques. The surfaces of all adsorbents clearly demonstrated negative charge (pH _(pzc) > pH of the mixture solution), resulting in a high adsorption capacity for each metal cation. Fe ~(2+) was found to be more easily adsorbed on modified CP than the other kinds of metal cations. Synergistic effects between the carboxylic groups and MnO _(2) on the surface of CPMn resulted in better performance for metal cation adsorption than was shown by CPHNO _(3) . The maximum adsorption capacities for Fe ~(3+) , Fe ~(2+) , Ca ~(2+) and Zn ~(2+) using CPMn, which were obtained from a monolayer adsorption process via Langmuir isotherms ( R ~(2) > 0.99), were 70.67, 68.60, 5.06 and 22.38 mg g ~(?1) , respectively. The adsorption behavior and monolayer-physisorption behavior, via a rapid adsorption process as well as single-step intra-particle diffusion, were also verified and supported using Dubinin–Radushkevich, Redlich–Peterson and Toth isotherms, a pseudo-second-order kinetic model and the Weber–Morris model. Moreover, the thermodynamic results indicated that the adsorption process of metal cations onto the CPMn surface was endothermic and spontaneous in nature. This research is expected to provide a green way for the production of low-cost/efficient adsorbents and to help gain an understanding of the adsorption behavior/process for the selective removal of metal ions from wastewater pollution.
机译：研究了源自棕榈仁蛋糕（木质纤维素残留物）碳化的低成本/有效吸附剂或生物炭（CP）的化合物制备和改性，用于选择性吸附各种金属阳离子，例如Fe〜（3+）， Fe〜（2+），Ca〜（2+）和Zn〜（2+），来自水溶液。用KMNO _（4）（CPMN）和HNO _（3）（CPHNO _（3））修饰CP表面，以提高吸附效率。通过BET，pH _（PZC），FT-IR，BOEHM滴定，TG-DTG，XRD和SEM-EDS技术研究了AS制备的吸附剂的物理化学性质。所有吸附剂的表面清楚地证明了混合物溶液的负电荷（pH _（PC）> pH值），导致每个金属阳离子的吸附能力高。发现Fe〜（2+）更容易吸附于改性CP上的其他类型的金属阳离子。 CPMN表面上的羧基和MnO _（2）之间的协同效应导致金属阳离子吸附性能比CPHNO _（3）所示的更好的性能。使用CPMN的Fe〜（3+），Fe〜（2+），Ca〜（2+）和Zn〜（2+）的最大吸附容量，该CPMN通过Langmuir等温线从单层吸附过程中获得（R〜（ 2）> 0.99）分别为70.67,68.60,5.06和22.38mg g〜（α1）。通过快速吸附过程以及单步歧粒子扩散的吸附行为和单层 - 物理吸附行为也使用Dubinin-Radushkevich，Redlich-Peterson和Toth Isotherms进行验证和支持伪二阶动力学模型和Weber-Morris模型。此外，热力学结果表明，金属阳离子在CPMN表面上的吸附过程在自然中吸热和自发性。该研究预计将为生产低成本/有效的吸附剂提供一种绿色方式，并有助于了解从废水污染中选择性地去除金属离子的吸附行为/过程。

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