Application of nanochitosan and chitosan particles for adsorption of Zn(II) ions pollutant from aqueous solution to protect environment

Abstract

Existence of heavy metals like zinc within water source is considered as one of the most important environmental problems. Accumulating within alive tissues, zinc raises various diseases and disorders. Chitosan is a hydrophilic polymer which is raised from acetyl groups of chitin from alkaline solution: it is employed widely as a well-known adsorbent for removing heavy metal ions. Present study aimed at optimizing the production of chitosan nano size particles by method of calvo and compared the adsorption of Zn (II) ions by chitosan macro and nano size particles. Adsorption experiments were conducted in a batch system and the effects of temperature, pH, contact time and initial concentration of metal ions on productivity of adsorption of zinc ions have been considered. Performing analysis DLS revealed that mean size of nano chitosan particles is 19.84 nm. Optimal adsorption by chitosan and nano chitosan has been done in pH 7 and about of 5. Efficiencies of both adsorbent were increased by increasing contact time. Both adsorbent had maximum efficiency at the temperature of 25°C. At the concentration of 10 mg/ L of zinc metal ions, maximum effective removal of chitosan macro and nano size particles were 90.80 and 99.10 %, respectively. Maximum capacity of adsorption by chitosan macro and nano size particle was 196.07 and 370.37 mg/g, respectively. Adsorption kinetics followed a pseudo second order model. Nanochitosan compared to chitosan particles had higher removal efficiency for Zinc metal ions due to nano size of particles, larger adsorption surfaces and more functional groups.

Effects of Bentonite Activation Methods on Chitosan Loading Capacity

“…As the temperature increases, the velocity of the chitosan molecules in the solution increases, which promotes chitosan desorption and reduces the loading. This trend also indicates that the loading of chitosan onto the bentonite surface is an exothermic reaction [21].…”

Evaluation of the role of chitosan and chitosan nanoparticles on reducing or removing heavy metals in the Nile tilapia, Oreochromis niloticus

“…Thus, it is more efficient to supplement fishmeal-based diet with CSNP that has higher effective chelation capacity for heavy metal compared to CS. Small size, large surface and high stability may be the reasons for CSNP high ability of chelation (Seyedmohammadi et al, 2016;Zareie et al, 2019). The higher density of adsorption sites of CSNP increases the probability of coordinate bond formation between the CSNP functional group and heavy metals compared to CS (Yu et al, 2013).…”

Carbohydrate biopolymers, lignin based adsorbents for removal of heavy metals (Cd2+, Pb2+, Zn2+) from wastewater, regeneration and reuse for spent adsorbents including latent fingerprint detection: A review

“… Chitosan and nanochitosan -pH 7 and 5 as optimum. -Nanochitosan compared to Chitosan particles had higher removal efficiency for Zinc metal ions due to nano-size and larger surfaces area Zn 2+ [ 34 ] −90.80% and 99.10 % adsorption observed. -Utmost adsorption capacities to adsorb of 196.07 and 370.37 mg g −1 , respectively.…”

“…Adsorption kinetics followed a pseudo second order model. Nanochitosan compared to chitosan particles had a higher removal efficiency for Zinc metal ions due to the nano -sized particles, larger adsorption surfaces and more functional groups [ 34 ].…”