Chromate is considered as a serious environmental problem due its toxicity. Iron nanoparticles produced by green tea polyphenols (GT-nZVI) is a powerful reductant, which can effectively reduce Cr(VI) to Cr(III). Nano ZVI suspension was initially conceived ideal for direct injection in the contaminated aquifers. However GT-nZVI presents limited mobility in calcareous aquifers. For this reason the incorporation of nanoiron in a permeable reactive barrier was investigated as an alternative mode of GT-nZVI application. Namely an amount of soil was loaded with nZVI (0.40 mmol/g of soil) and was evaluated for Cr(VI) removal by conducting batch and column tests. Batch tests were carried out by mixing soil samples, loaded with different levels of nZVI from 0.04 to 0.40 mmol per gram, with contaminated groundwater (GW) containing 1300 ppb Cr(VI). Cr(VI) concentration dropped below detection limit within 1 day using the highest nZVI dose. Soil pre-loaded with nZVI (S-nZVI) presented also high efficiency for chromates remediation, when tested under flow conditions by conducting column tests.

铬酸盐由于其毒性而被认为是严重的环境问题。绿茶多酚（GT-nZVI）生产的铁纳米颗粒是一种强大的还原剂，可以有效地将Cr（VI）还原为Cr（III）。纳米ZVI悬浮液最初被认为是直接注入受污染含水层的理想选择。但是，GT-nZVI在钙质含水层中的活动性有限。因此，研究了将纳米铁掺入可渗透的反应性阻挡层中作为GT-nZVI应用的替代方式。即，一定量的土壤中装有nZVI（0.40 mmol / g土壤），并通过分批和柱测试评估了Cr（VI）的去除。批处理测试是通过将负载了0.04至0.40 mmol / g不同水平的nZVI的土壤样品与含有1300 ppb Cr（VI）的受污染的地下水（GW）混合来进行的。使用最高的nZVI剂量，Cr（VI）浓度在1天之内降至检测极限以下。当在流动条件下进行柱测试时，预装载nZVI（S-nZVI）的土壤对铬酸盐的修复也具有很高的效率。