Johnson Preethi, Loganathan Chitra, Krishnan Vennila, Sakayanathan Penislusshiyan, Raji Vijayan, Vijayan Sudha, Sathishkumar Palanivel, Murugesan Kumarasamy, Palvannan Thayumanavan
a Department of Biochemistry , Periyar University , Salem , India.
b Centre for Environmental Sustainability and Water Security (IPASA), Research Institute for Sustainable Environment (RISE) , Universiti Teknologi Malaysia , Skudai , Malaysia.
Environ Technol. 2018 Jun;39(11):1376-1383. doi: 10.1080/09593330.2017.1329355. Epub 2017 May 25.
The aqueous extract of various plants like Coriandrum sativum (AECS), Alternanthera tenella colla (AEAT), Spermacoce hispida (AESH) and Mollugo verticillata (AEMV) was studied for its hexavalent chromium (Cr) reduction property. Even though antioxidant activity was present, AEAT, AESH and AEMV did not reduce Cr. AECS showed rapid and dose-dependent Cr reduction. The efficient reduction of 50 mg/L of Cr using AECS was attained in the presence of 250 µg/mL of starting plant material, incubating the reaction mixture at pH 2, 30°C and agitation at 190 rpm. Under such conditions, about 40 mg/L of Cr was reduced at 3 h of incubation. FT-IR analysis revealed the involvement of phenols, alcohols, alpha-hydroxy acid and flavonoids present in the AECS for the Cr reduction. These results indicate that not all the plant extracts with rich antioxidants are capable of reducing Cr. Using the conditions standardized in the present study, AECS reduced about 80% of Cr present in the tannery effluent. These results signify the application of AECS as an eco-friendly method in the wastewater treatment.
对多种植物的水提取物进行了研究，如芫荽（AECS）、细叶莲子草（AEAT）、粗叶丰花草（AESH）和粟米草（AEMV），考察其对六价铬（Cr）的还原性能。尽管AEAT、AESH和AEMV具有抗氧化活性，但它们不能还原Cr。AECS表现出快速且剂量依赖性的Cr还原。在250μg/mL起始植物材料存在的情况下，将反应混合物在pH 2、30°C下孵育并以190 rpm搅拌，使用AECS可有效还原50 mg/L的Cr。在这种条件下，孵育3小时后约40 mg/L的Cr被还原。傅里叶变换红外光谱（FT-IR）分析表明，AECS中存在的酚类、醇类、α-羟基酸和黄酮类化合物参与了Cr的还原。这些结果表明，并非所有富含抗氧化剂的植物提取物都能还原Cr。采用本研究中标准化的条件，AECS可还原制革废水中约80%的Cr。这些结果表明AECS作为一种环保方法在废水处理中的应用。
