Effective Removal of Methylene Blue from Simulated Wastewater Using ZnO-Chitosan Nanocomposites: Optimization, Kinetics, and Isotherm Studies

Abstract

Successful synthesis of ZnO-chitosan nanocomposites was conducted for the removal of methylene blue from an aqueous medium. Remarkable performance of the nanocomposites was demonstrated for the effective uptake of the dye, thereby achieving 83.77, 93.78 and 97.93 mg g−1 for the chitosan, 5 wt.% ZnO-Chitosan and 10 wt.% ZnO-Chitosan, respectively. The corresponding adsorption efficiency was 88.77, 93.78 and 97.95 for the chitosan, 5 wt.% ZnO-Chitosan and 10 wt.% ZnO-Chitosan, respectively. Upon regeneration, good reusability of the nanocomposites was manifested for the continuous removal of the dye up to six consecutive cycles. The adsorption process was kinetically described by a pseudo-first order model, while the isotherms were best fitted by the Langmuir model.

Optimization, Kinetics, and Isotherm Studies of Methyl Thioninium Chloride Removal from Simulated Solutions Using Chitosan Derivatives

“…The increment in the swelling capacity may also be ascribed to the free water content, which has high mobility and resulted in the capillary wetting of interconnected open hydrogel pores, which finally causes higher swelling capacity in alkaline media. 1 On the other hand, the effect of temperature on the % swelling capacity can be observed in two different behaviors:…”

“…The electrostatic effect is crucial in the adsorption behavior of MB. 1 Plenty of protons exist in the aqueous solution under acidic circumstances. These protons will increase the positive charge on the surface of the adsorbents, preventing the cationic dye MB from making contact with the active adsorption sites on the surface of the N,O-CM/Cs, Cs/GA, Cs/GA/ECH, and Cs/GA/MBA.…”

“…The extraordinary growth of the textile industry has resulted in a huge increase in the demand for organic dyestuffs as primary colorants. The yearly global production of dyes was anticipated to surpass 700,000 tons until recently. – Yet, 15–20% of all the dyestuffs used in this industry were discharged into bodies of water. , Methylene blue (MB), one of the most often utilized cationic dyes, possesses a high color saturation that blocks sunlight from penetrating water bodies, hindering photosynthesis in aquatic creatures, and posing a serious threat to the ecological balance of water bodies. , When taken after an inappropriate exposure, MB can also cause respiratory distress, diarrhea, vomiting, and other unpleasant symptoms. , To protect the environment and public health, dyes must be removed from wastewater . The treatment of printing and dyeing wastewater using conventional technologies includes membrane filtration, adsorption, , chemical oxidation, photodegradation, etc.…”

L-Arginine Grafted Chitosan as Corrosion Inhibitor for Mild Steel Protection

“…Some researchers have claimed that chitosan is a suitable corrosion inhibitor for mild steel [ 6 , 12 ]. However, the extensive inter- and intramolecular hydrogen bonding of the polymer decreased its solubility in an aqueous and acidic environment, thereby lowering its inhibitory actions on mild steel [ 13 , 14 ]. Herein, we aim to boost the effectiveness of the polymer’s inhibitory actions by incorporating L-arginine ( Figure 1 ).…”

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…Adsorption, among the techniques, is the most powerful, economical, and efficient technique utilized to decontaminate dyes from wastewater at low concentrations due to its simplicity, low cost, and not requiring advanced technology [ 10 , 11 , 12 , 13 ]. During this year, novel adsorbent materials have been reported to remove toxic dyes such as methylene blue from wastewater [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Activated carbon (AC) is one of the most traditional, effective, and extensively utilized adsorbents in adsorption technologies, and it is among the cheapest sorbents in market.…”