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首页> 外文期刊>Environmental research >Production of aminated peat from branched polyethylenimine and glycidyltrimethylammonium chloride for sulphate removal from mining water
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Production of aminated peat from branched polyethylenimine and glycidyltrimethylammonium chloride for sulphate removal from mining water

机译：用支链聚乙烯亚胺和缩水甘油基三甲基氯化铵生产胺化泥炭，用于去除矿井水中的硫酸盐

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A novel bio-based anion exchanger was developed to remove sulphate from synthetic solutions and mine water. Different modification parameters such as chemical dosage and reaction time were tested when using a unique combination of branched polyethylenimine (PEI) and glycidyltrimethylammonium chloride (GTMAC) to produce an aminated biosorbent (termed PG-Peat). The novel and environment-friendly modification method was shown by FTIR and XPS analyses to be able to introduce quaternary ammonium and N-H groups into PG-Peat. The optimal modification conditions (PEI: 0.26 mmol/g, GTMAC: 0.0447 mol/g, reaction time: 18 h) resulted in the maximum sulphate uptake capacity (189.5 +/- 2.7 mg/g) with a partition coefficient value of 0.02 mg/g/mu M under acidic conditions. At low pH, amine groups on the peat surface became cationized, thereby resulting in a higher sulphate removal capacity. Batch sorption tests using PG-Peat exhibited rapid sulphate sorption after only five minutes of contact. The sulphate uptake by PG-Peat was unaffected by the presence of varying chloride concentrations, while slightly lower uptake capacity was observed when different concentrations of nitrate were present. The biosorbent showed high recyclability, which was revealed in regeneration studies. Tests were performed involving real mine water, where PG-Peat showed its potential to be a highly efficient biosorbent for sulphate removal at low pH values, indicating its suitability for treating acidic mine waters.
机译：开发了一种新型的基于生物的阴离子交换剂，用于从合成溶液和矿井水中去除硫酸盐。当使用支化聚乙烯亚胺（PEI）和缩水甘油基三甲基氯化铵（GTMAC）的独特组合以生产胺化生物吸附剂（称为PG-Peat）时，测试了不同的修饰参数，例如化学剂量和反应时间。 FTIR和XPS分析表明，该新型环保改性方法能够将季铵和N-H基团引入PG-泥炭。最佳修饰条件（PEI：0.26 mmol / g，GTMAC：0.0447 mol / g，反应时间：18 h）导致最大的硫酸盐吸收能力（189.5 +/- 2.7 mg / g），分配系数值为0.02 mg / g /μM在酸性条件下。在低pH下，泥炭表面上的胺基被阳离子化，从而导致更高的硫酸盐去除能力。仅接触五分钟后，使用PG-Peat进行的批次吸附测试就显示出快速的硫酸盐吸附。 PG-Peat对硫酸盐的吸收不受氯化物浓度变化的影响，而当存在不同浓度的硝酸盐时，则观察到吸收能力略低。该生物吸附剂显示出高可回收性，这在再生研究中得到了证实。进行了涉及实际矿井水的测试，其中PG-Peat显示出其在低pH值下具有高效去除硫酸盐的生物吸附剂的潜力，表明其适用于处理酸性矿井水。

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