利用废鱼鳞片衍生的生物吸附剂固定重金属以对抗沉积物毒性的方法。

An approach to counter sediment toxicity by immobilization of heavy metals using waste fish scale derived biosorbent.

机构信息

Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India, 826004.

Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India, 826004.

出版信息

Ecotoxicol Environ Saf. 2020 Jan 15;187:109833. doi: 10.1016/j.ecoenv.2019.109833. Epub 2019 Oct 22.

DOI:10.1016/j.ecoenv.2019.109833

PMID:31654862

Abstract

The utilization of fish scale-derived biosorbent for immobilization of cadmium and lead in polluted sediment was thoroughly investigated in this study. Fish scale (FS) biomass was chemically and physically treated. The FS biomass treated with acid (0.1 M HCl), alkali (0.1 M NaOH) and hydrothermally, showed minimum removal capacity. While, FS treated hydrothermally along with acid showed the maximum removal efficiency of metal ions. We used different dosages (0%, 2.5%, 5%, 10%, 15%, and 20%) of FS biosorbent in the sediment. Isotherm modelling showed that this biosorbent can hold 89.30 and 92.65 mg/g of Cd and Pb on its surface. This indicated that prepared FS biosorbent has enough potential to adsorb Cd and Pb ions on its surface from the sediment. Compared to the control, sediment treated with 20% FS showed the highest immobilization capacities for Pb (92.9%), and Cd (87.9%). The values of partition coefficient (K) increased by 83% for Pb and 78% for Cd, which specified that availability of free ions of Pb and Cd in the aquatic system was successfully decreased. The sediment treated with 20% FS biosorbent showed 70-80% immobilization of Cd and Pb from mobile and exchangeable fractions that ultimately decreased the bioavailability of metal ions to the biota. Inclusively, compared to control, sediment served with 20% FS biosorbent showed higher level of Pb and Cd ions in residual fraction near by 80%. The prepared FS biosorbent had shown its potential in immobilizing the Cd and Pb ions from sediment as a cheap and ecologically feasible method for amendment.

摘要

本研究深入探讨了利用鱼鳞衍生的生物吸附剂固定污染沉积物中的镉和铅。对鱼鳞（FS）生物质进行了化学和物理处理。用酸（0.1 M HCl）、碱（0.1 M NaOH）和水热处理的 FS 生物质表现出最小的去除能力。而经水热处理与酸处理的 FS 生物质表现出最大的金属离子去除效率。我们在沉积物中使用了不同剂量（0%、2.5%、5%、10%、15%和 20%）的 FS 生物吸附剂。等温线模型表明，这种生物吸附剂可以在其表面上吸附 89.30 和 92.65 mg/g 的 Cd 和 Pb。这表明，所制备的 FS 生物吸附剂具有足够的潜力，可以从沉积物中吸附 Cd 和 Pb 离子。与对照相比，用 20%FS 处理的沉积物对 Pb（92.9%）和 Cd（87.9%）的固定化能力最高。分配系数（K）值分别增加了 83%和 78%，这表明水体中 Pb 和 Cd 的游离离子的可用性已成功降低。用 20%FS 生物吸附剂处理的沉积物使 Cd 和 Pb 的可移动和可交换分数的固定化率达到 70-80%，从而降低了金属离子对生物群的生物有效性。总的来说，与对照相比，用 20%FS 生物吸附剂处理的沉积物中剩余分数中的 Pb 和 Cd 离子含量接近 80%，含量更高。所制备的 FS 生物吸附剂在固定化 Cd 和 Pb 离子方面表现出了潜力，是一种廉价且生态可行的修复方法。