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Sequential Abatement of FeII and CrVI Water Pollution by Use of Walnut Shell-Based Adsorbents
Processes ( IF 3.5 ) Pub Date : 2021-01-25 , DOI: 10.3390/pr9020218
Marius Gheju , Ionel Balcu

In this study walnut shells, an inexpensive and readily available waste, were used as carbonaceous precursor for preparation of an innovative adsorbent (walnut-shell powder (WSP)) which was successfully tested for the removal of FeII from synthetic acid mine drainage (AMD). Then, the exhausted iron-contaminated adsorbent (WSP-FeII) was recovered and treated with sodium borohydride for the reduction of adsorbed FeII to Fe0. The resulting material (WSP-Fe0) was subsequently tested for the removal of CrVI from aqueous solutions. Treatability batch experiments were employed for both FeII and CrVI-contaminated solutions, and the influence of some important experimental parameters was studied. In addition, the experimental data was interpreted by applying three kinetic models and the mechanism of heavy metal removal was discussed. The overall data presented in this study indicated that fresh WSP and WSP-Fe0 can be considered as promising materials for the removal of FeII and CrVI, respectively. Furthermore, the present work clearly showed that water treatment residuals may be converted in upgraded materials, which can be successfully applied in subsequent water treatment processes. This is an example of sustainable and environmentally-friendly solution that may reduce the adverse effects associated with wastes and delay expensive disposal methods such as landfilling or incineration.

中文翻译:

通过使用核桃壳基吸附剂依次减少FeII和CrVI水污染

这项研究中,使用核桃壳(一种廉价且易于获得的废物)作为碳质前体来制备创新的吸附剂(核桃壳粉(WSP)),该吸附剂已成功通过测试从合成酸性矿井排水中去除了Fe II。 )。然后,回收用尽的铁污染的吸附剂(WSP-Fe II),并用硼氢化钠处理以将吸附的Fe II还原为Fe 0。随后测试所得材料(WSP-Fe 0)从水溶液中去除Cr VI的能力。Fe II和Cr VI均采用可批处理的实验污染的溶液,并研究了一些重要实验参数的影响。此外,通过应用三个动力学模型解释了实验数据,并讨论了重金属去除的机理。这项研究提供的总体数据表明,新鲜的WSP和WSP-Fe 0可以被认为是去除Fe II和Cr VI的有前途的材料, 分别。此外,目前的工作清楚地表明,水处理残留物可以转化为升级材料,可以成功应用于后续的水处理过程。这是可持续和环境友好型解决方案的一个示例,可以减少与废物相关的不利影响,并延迟昂贵的处置方法(如垃圾填埋或焚化)。
更新日期:2021-01-25
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