Specific Removal of Nitrite from Lake Urmia Sediments by Biohydrogel Based on Isolated Soy Protein/Tragacanth/Mesoporous Silica Nanoparticles/Lycopene,Global Challenges

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Specific Removal of Nitrite from Lake Urmia Sediments by Biohydrogel Based on Isolated Soy Protein/Tragacanth/Mesoporous Silica Nanoparticles/Lycopene
Global Challenges ( IF 4.4 ) Pub Date : 2020-09-30 , DOI: 10.1002/gch2.202000061
Farrokh Asadzadeh _{1,

2} , Sajad Pirsa _{2,

3}

Affiliation

In this study, a biodegradable biohydrogel based on isolated soy protein/tragacanth containing mesoporous silica nanoparticles and lycopene pigment (ISP/TG/MPS/Lyc) is prepared. The physicochemical characteristics and structure of the biohydrogel are investigated by scanning electron microscopy, Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction, and thermal gravimetry analysis (TGA) techniques. Mechanical properties (tensile strength and elongation at break point), antioxidant activity, water solubility, water absorption capacity (WAC), and the humidity content of the biohydrogels are studied. Five optimal biohydrogels including pure ISP, ISP/TG, ISP/MPS, ISP/Lyc, and ISP/TG/MPS/Lyc are used for chemical treatment of Lake Urmia sediments. For this purpose, biochemical oxygen demand (BOD), chemical oxygen demand (COD), nitrate, and nitrite of sediments are examined before and after treatment with biohydrogels. According to the FTIR results, there is only physical interaction between lycopene and isolated soy protein. According to the TGA results, adding silica mesoporous to biohydrogel increases its thermal stability. Tragacanth gum and lycopene pigment reduce water solubility and increase the WAC of biohydrogel. The biohydrogel significantly reduces the BOD and COD of the sediments. The biohydrogel reduces nitrite content up to 90%, while reducing nitrate content by almost 30%. The results show that the biohydrogel containing lycopene selectively purifies nitrite from the sediment solution of Lake Urmia.

中文翻译：

基于分离大豆蛋白/黄芪胶/介孔二氧化硅纳米粒子/番茄红素的生物水凝胶特异性去除乌尔米亚湖沉积物中的亚硝酸盐

在本研究中，制备了一种基于分离大豆蛋白/黄蓍胶、含有介孔二氧化硅纳米颗粒和番茄红素色素（ISP/TG/MPS/Lyc）的可生物降解生物水凝胶。通过扫描电子显微镜、傅里叶变换红外光谱（FTIR）、X射线衍射和热重分析（TGA）技术研究了生物水凝胶的物理化学特性和结构。研究了生物水凝胶的机械性能（拉伸强度和断裂点伸长率）、抗氧化活性、水溶性、吸水能力（WAC）和湿度含量。包括纯 ISP、ISP/TG、ISP/MPS、ISP/Lyc 和 ISP/TG/MPS/Lyc 在内的五种最佳生物水凝胶用于乌尔米亚湖沉积物的化学处理。为此，在生物水凝胶处理之前和之后检查沉积物的生化需氧量 (BOD)、化学需氧量 (COD)、硝酸盐和亚硝酸盐。根据 FTIR 结果，番茄红素和大豆分离蛋白之间仅存在物理相互作用。根据TGA结果，在生物水凝胶中添加二氧化硅介孔可提高其热稳定性。黄芪胶和番茄红素色素降低了水溶性并增加了生物水凝胶的WAC。生物水凝胶显着降低沉积物的BOD和COD。生物水凝胶可将亚硝酸盐含量降低高达 90%，同时将硝酸盐含量降低近 30%。结果表明，含有番茄红素的生物水凝胶可以选择性地净化乌尔米亚湖沉积液中的亚硝酸盐。

更新日期：2020-12-03

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