Department of Chemical and Process Engineering, Faculty of Engineering and Architecture, Kırşehir Ahi Evran University, Kırşehir, Turkey.
Department of Medical Biochemistry, Faculty of Medicine, Kırşehir Ahi Evran University, Kırşehir, Turkey.
Int J Phytoremediation. 2021;23(11):1145-1156. doi: 10.1080/15226514.2021.1880368. Epub 2021 Feb 15.
This study investigated the reduction of hexavalent chromium (Cr(VI)) with sulfur dioxide (SO) and adsorption of Cr(VI) onto dried grape pulp carbonized with sulfuric acid. Cr(VI) reduction capacities of SO were determined. The filtrate was titrated with NaOH solution after shaking and filtering the carbonized material to retain unreacted sulfuric acid (HSO). Simple washing recovered 25-38% of the experimental acid at low concentrations. The carbonized material was washed twice with distilled water and then dried at 105°C and weighed. The carbonized material had a yield of 56.6% (grape pulp/sulfuric acid ratios of 1:2), and the lower the HSO content, the better the yield, suggesting that the higher the acid content, the lower the Cr(VI) content per unit grape pulp. Cr(VI) reduction capacities were 219.5, 195.3, and 190.9mg Cr(VI)/g-HSO for the grape pulp/sulfuric acid ratios of 1:1, 1:2, and 1:3, respectively. : A carbonaceous material was obtained from grape pulp by carbonizing with concentrated sulfuric acid. The main objective of this study was to evaluate gas, liquid, and solid products or co-products obtained during carbonization process for hexavalent chromium treatment in aqueous solutions. In this context, (a) hexavalent chromium reduction capability of the gas evolved during carbonization was determined, (b) characterization of unreacted acid recovered by washing the carbonized product left after carbonization step was done, (c) carbonaceous adsorbent obtained was characterized and (d) hexavalent chromium adsorption characteristics of carbonaceous material obtained was determined.HIGHLIGHTSReduction and adsorption mechanisms of hexavalent chromium were investigated.A waste recycling method was proposed.The effects of sulfuric acid on carbonization were assessed.The structures and chemical compositions of a carbonized material were evaluated.The carbonized material is a cost-effective porous adsorbent for a clean environment.
这项研究调查了二氧化硫（SO）对六价铬（Cr(VI)）的还原作用以及用硫酸碳化的干葡萄浆对 Cr(VI)的吸附作用。测定了 SO 的 Cr(VI)还原能力。将碳化材料摇匀并过滤后，用 NaOH 溶液滴定以保留未反应的硫酸（HSO）。简单洗涤可在低浓度下回收 25-38%的实验酸。用蒸馏水洗涤碳化材料两次，然后在 105°C 下干燥并称重。碳化材料的产率为 56.6%（葡萄浆/硫酸比为 1:2），HSO 含量越低，产率越高，这表明酸含量越高，单位葡萄浆中的 Cr(VI)含量越低。葡萄浆/硫酸比分别为 1:1、1:2 和 1:3 时，Cr(VI)的还原能力分别为 219.5、195.3 和 190.9mg Cr(VI)/g-HSO。用浓 HSO 碳化葡萄浆得到一种炭质材料。本研究的主要目的是评估碳化过程中获得的气体、液体和固体产品或副产物，以处理水溶液中的六价铬。在这种情况下，（a）确定碳化过程中产生的气体的六价铬还原能力，（b）对碳化后残留的碳化产物进行洗涤回收的未反应酸进行表征，（c）对获得的炭质吸附剂进行表征，（d）确定获得的炭质材料对六价铬的吸附特性。
