This work consists of gathering the leaves of ten different South African plants from the local reserve. Black and green tea were sourced commercially. The plants were air dried and polar crude material extracted using deionized water. These crude phytochemicals were used as green chelators to remove metal ions from an aqueous solution. Iron(III), lead(II) and copper(II) ions were competitively removed from an eight metal ion solution with iron(III) being removed at more than 80% followed by lead(II) with greater than 40% removal and copper(II) with removal values of more than 20%. Metal ion removal was shown to be affected by change in pH of the solution, indicating that removal took place via the pH-swing mechanism. As the pH is increased, iron(III) is first removed followed by lead(II) and then copper(II). Iron(III) and lead(II) were selectively removed even at a 10-fold dilution level compared to the other metal ions present. Loading tests showed that iron(III) removal does not change, but for lead(II) and copper(II) there is a noticeable increase in removal with an increase in the amount of crude. The phytochemicals in the crude were identified using Liquid chromatography-tandem mass spectrometry (LC-MS/MS). Some crudes had similar phytochemicals (quercetin) while others had unique compounds. Statement of novelty It is the first time that crude polar phytochemicals from South African plants are used as green chelators. These green chelators selectively remove iron(III), lead(II) and copper(II) from a mix of eight different base metal ions. Iron(III) can be selectively removed at pH as low as 3.00 and, when iron(III) and lead(II) are 10 times more dilute compared to the other metal ions, iron(III) and lead(II) are still selectively removed. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is used to identify some of the phytochemicals present in these plants.

译文

这项工作包括从当地保护区收集十种不同的南非植物的叶子。红茶和绿茶是商业采购的。将植物风干,并使用去离子水提取极性粗物质。这些粗植物化学物质用作绿色螯合剂,以从水溶液中去除金属离子。从八种金属离子溶液中竞争性地除去铁 (III) 、铅 (II) 和铜 (II) 离子,其中铁 (III) 以超过80% 除去,接着除去大于40% 的铅 (II) 和除去值大于20% 的铜 (II)。金属离子的去除受到溶液pH变化的影响,表明去除是通过pH摆动机制进行的。随着ph值的增加,首先除去铁 (III),然后除去铅 (II),然后除去铜 (II)。与存在的其他金属离子相比,甚至以10倍的稀释水平选择性地去除铁 (III) 和铅 (II)。负载测试表明,铁 (III) 的去除率没有变化,但是对于铅 (II) 和铜 (II),随着原油量的增加,去除率显着增加。使用液相色谱-串联质谱法 (lc-ms/MS) 鉴定了原油中的植物化学物质。一些原油具有相似的植物化学物质 (槲皮素),而另一些则具有独特的化合物。新颖性声明这是南非植物的粗极性植物化学物质首次被用作绿色螯合剂。这些绿色螯合剂从八种不同的贱金属离子的混合物中选择性地去除铁 (III),铅 (II) 和铜 (II)。铁 (III) 可以在低至3.00的pH下被选择性地除去,并且当铁 (III) 和铅 (II) 比其它金属离子稀释10倍时,铁 (III) 和铅 (II) 仍然被选择性地除去。液相色谱-串联质谱 (lc-ms/MS) 用于鉴定这些植物中存在的某些植物化学物质。

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