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

Abstract

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.

Zein/EDTA/chlorophyll/nano-clay Biocomposite Sorbent: Investigation Physicochemical Properties Sorbent and Its Ability to Remove Contaminants of Industrial Wastewater

“…As mentioned earlier, increasing the water absorption capacity increases the interaction between biosorbent and wastewater and increases the efficiency of biosorbent in wastewater treatment. In a similar study, Asadzadeh and Pirsa investigated the physicochemical properties and the water adsorption capacity of biosorbent based on isolated soy protein/ lycopene pigment, which confirms the results of the present study [9]. Zong et al designed the biosorbent of lignin and investigated its physicomechanical properties and solubility.…”

“…Water absorption capacity was determined by Asadzadeh and Pirsa methods [9]. To perform this test, 2 g of biosorbent was dried in an oven at 150 °C.…”

“…This substance disrupts the oxygen supply to the body [8]. Nitrite combines with some of the body's amines and amides to form nitrosamines, which are carcinogenic [7][8][9]. Biodegradable adsorbent polymers are a group of polymer networks whose chains are interconnected by cross links and due to their ionic properties and type of interconnection, holes are formed in the structure of the polymer that cause a large amount of aqueous solutions absorption without dissolving in them [10].…”

Zein/EDTA/chlorophyll/nano-clayBiocomposite Sorbent; Studying Physicochemical Properties and Ability to Remove Industrial Wastewater Contaminants

“…mentioned earlier, increasing the water absorption capacity increases the interaction between biosorbent and wastewater and increases the efficiency of biosorbent in wastewater treatment. In a similar study, Asadzadeh and Pirsa (2020) investigated the physicochemical properties and the water adsorption capacity of biosorbent based on isolated soy protein/lycopene pigment, which confirms the results of the present study[9] Zong et al (2018). designed the biosorbent of lignin and investigated its physicomechanical properties and solubility.…”

“…This substance disrupts the oxygen supply to the body. Nitrite combines with some of the body's amines and amides to form nitrosamines, which are carcinogenic [7][8][9].…”