Characterisation of products from fungally modified wollastonite and the simulation experiment of Pb2+ fixation
Characterisation of products from fungally modified wollastonite and the simulation experiment of Pb2+ fixation
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真菌改性硅灰石产品表征及固定Pb2模拟实验
DOI：
10.1016/j.scitotenv.2020.143357
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发表时间：
2021
影响因子：
9.8
通讯作者：
Lian B
中科院分区：
文献类型：
--
作者：
Yu CF;Wang XX;Huang SS;Zhang XW;An XC;Xu M;Lian B
利用廉价的原材料和简单的生物改性方法获得改性材料修复重金属具有潜在的应用前景。本文采用黑曲霉对硅灰石进行改性，进一步探讨其固矿能力和固矿机理。结果表明，在不同的生长和代谢条件下，A.黑曲霉促进了硅灰石的风化和白硅钙石的合成，形成了一种对重金属Pb 2+具有良好固定性能的真菌改性矿物复合体（MCF）。MCF对Pb 2+的最大吸附量（434.78 mg/g）明显大于硅灰石（11.86 mg/g），但解吸率较低。在不同的酸性条件下（1 ≤ pH ≤ 5.5），Pb 2+的去除率均大于75%。XRD、FTIR、BET比表面积和SEM-EDS测试结果表明，MCF具有特殊的有机-无机复合结构，使其与离子有较大的接触面积，能有效地通过物理-化学吸附去除Pb 2+。批吸附实验结果表明，MCF吸附过程主要是单分子膜内的自发吸热反应。该研究为硅灰石的生物改性及其在重金属污染修复中的应用提供了新的视角。
Using cheap raw materials and simple biological modification methods to obtain modified materials to remediate heavy metals has potential application prospects. Here,Aspergillus nigerwas used to modify wollastonite and further explore its fixation capacity and mechanism. The results showed that the growth and metabolism ofA. nigerpromoted the weathering of wollastonite and the synthesis of whewellite, forming a mineral composite through fungal modification (MCF) with excellent fixation properties of heavy metal Pb2+. The maximum adsorption capacity of MCF for Pb2+(434.78 mg/g) is significantly greater than that of original wollastonite (11.86 mg/g) with a desired lower desorption rate. Additionally, its removal rate of Pb2+is higher than 75% under varying acidic conditions (1 ≤ pH ≤ 5.5). The results of XRD, FTIR, BET specific surface area, and SEM-EDS showed that MCF has a special organic-inorganic composite structure, which imparts a larger contact area for ions, and efficient removal of Pb2+through combined physico-chemical adsorption. Batch adsorption results also indicated that the adsorption process by MCF was mainly a spontaneous endothermic reaction in the monolayer. This study provides a new perspective for the bio-modification of wollastonite and its application in the remediation of heavy metal pollution.