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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 Fe3+, Fe2+, Ca2+ and Zn2+, from aqueous solution. The CP surface was modified with KMnO4 (CPMn) and HNO3 (CPHNO3) 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. Fe2+ was found to be more easily adsorbed on modified CP than the other kinds of metal cations. Synergistic effects between the carboxylic groups and MnO2 on the surface of CPMn resulted in better performance for metal cation adsorption than was shown by CPHNO3. The maximum adsorption capacities for Fe3+, Fe2+, Ca2+ and Zn2+ 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：已经研究了从棕榈仁蛋糕的碳化（木质纤维素残留物）的低成本/有效吸附剂或生物炭（CP）的化合物制备和修饰已经研究了各种金属阳离子的选择性吸附，例如Fe3 +，Fe2 +，Ca2 +和Zn2 + ，来自水溶液。 CP表面用KMnO4（CPMN）和HNO3（CPHNO3）进行修饰，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，导致每种金属阳离子的高吸附能力。发现Fe2 +更容易吸附在改性CP上的改性CP而不是其他种类的金属阳离子。 CPMN表面上羧基和MNO2之间的协同效应导致金属阳离子吸附的性能比CPHNO3所示。使用CPMN的Fe3 +，Fe2 +，Ca2 +和Zn2 +的最大吸附容量，从单层吸附过程中通过Langmuir等温线（R-2> 0.99），分别为70.67,68.60,5.06和22.38mg g（-1） 。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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    《RSC Advances》 |2019年第42期|共13页
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