Adsorption of nitrate from aqueous solution by magnetic amine-crosslinked biopolymer based corn stalk and its chemical regeneration property

Adsorption of Nitrate onto ZnCl2‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

“…e mechanism of nitrate adsorption by magnetic amine-cross-linked biopolymer includes electrostatic attraction, ion exchange, and surface complex formation [27]. Soybean was modified with calcium chloride and hydrochloric acid and by calcination, and results confirmed that the mechanism of nitrate adsorption was mainly ion exchange [29].…”

“…e adsorption kinetics described the uptake rate of nitrate ion on the ZnCl 2 -modified CGAC, which controlled the equilibrium time [33]. e kinetic studies were helpful for predicting the adsorption rate with time and explaining the dynamic interactions of nitrate ions with adsorbents, which gave important information for designing and modeling the processes [27,33]. e experimental data were fitted by three different kinetic models: the pseudo-first-order model, pseudo-second-order model, and intraparticle diffusion model, and the results were discussed below.…”

“…Meanwhile, according to the calculated value (q e,cal ) and experimental uptake value (q e,exp ), the pseudo-second-order model was considered as the best-fit model in describing the nitrate adsorption from aqueous solution [29,35]. Pseudo-second-order model has been frequently invoked to describe adsorption of inorganic pollutants on GAC-based materials [29], and a similar study reported the nitrate adsorption onto magnetic amine-cross-linked biopolymer fitted with pseudo-second-order model as well [27].…”

“…In addition, studies showed the nitrate adsorption due to the different mechanisms [26][27][28][29][30]. e mechanism of nitrate adsorption by magnetic amine-cross-linked biopolymer includes electrostatic attraction, ion exchange, and surface complex formation [27].…”

A Simple Method for Synthesis of Triamine-SiO2Material toward Aqueous Nitrate Adsorption

“…This could be explained by the effect of solution pH value on the surface charge of adsorbent and nitrate species. Under acidic condition, NO3ions tend to combine with H + ions in solution to form HNO3, which reduces the electrostatic attraction between nitrate and positively charged functional groups on the surface of Amine-P-SiO2 adsorbent (Song et al, 2016). Meanwhile, the poor adsorption capacity of Amine-P-SiO2 under basic condition could be due to the competition of OHand nitrate ions for the same adsorption sites (Battas et al, 2019).…”