Abstract
This work presented the removal of nitrate ions in aqueous solution based on silica nanoparticles (SiNPs), which were extracted from rice husk ash. The optimal conditions for nitrate ion adsorption were studied including pH, contact time, adsorbate concentration, and amount of absorbance. The surface morphological analysis showed that the SiNPs extracted (purity of 98%) were around 50 nm with a surface area of 30 m2·g−1 and adsorption average pore width of 2.72 nm, offers possibility for high capability of nitrate ion removal. The experimental results showed that the nitrate ion capability of adsorption was obtained around 14.22 mg·g−1 with a concentration range from 0 to 25 mg·L−1 based on optimizing conditions including pH 6, contact time of 50 minutes, and SiNP dosage of 0.15 g vol−1. In addition, nitrate ion removal based on SiNPs will provide considerate benefits such as the reducing costly sample pretreatment steps, less time-consuming, and reliable methods for processing nitrate-polluted water.
Highlights
Nowadays, pollution of surface water by nitrate is serious problem
These materials needed the pretreatment for the removal process. erefore, it is worth to consider that silica nanoparticles (SiNPs) are promising material for removal of heavy metals [26,27,28] with high adsorption capability
The main elements were comprising of Si, O, and Na (Figure 1(c)) with weight concentrations of 23, 75, and 2%, respectively. e small amount of Na remained was due to unperfect process of washing
Summary
Pollution of surface water by nitrate is serious problem. Using large amount of artificial fertilizers has caused the penetration of nitrates into the surface water. Several methods for removal of nitrogen ions in wastewater have been reported including wetland treatment system [2,3,4], electrodialysis [5,6,7,8,9,10], electrochemical reaction [11,12,13,14,15,16], bioreactor system [17], integration between electrodialysis and electrolysis [18, 19], catalytic oxidation-removal process [20], and anion exchange resin [21]. Several adsorption materials have been used for nitrate ion removal such as coal-fired blue gas [20], soil profiles and sediments [22], and sawdust [23,24,25]. The reuse and recycling process of RHA for extraction of SiNPs is a cost-effective and environmental friendly method
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