Synthesis and performance evaluation of chitosan/zinc oxide nanocomposite as a highly efficient adsorbent in the removal of reactive red 198 from water

Abstract

Disposal of textile industrial effluents causes many environmental problems. The presence of chemical dyes in textile wastewater lead to the primary environmental pollution as well as the production of hazardous secondary compounds that are toxic and carcinogenic. In this study, Chitosan and Chitosan-zinc oxide (ZnO) nanocomposite were prepared and selected as a low-cost adsorbent with high adsorption capacity for removing reactive red 198 (RR 198) dye from contaminated. After preparation, it was characterized using Fourier-transform infrared spectroscopy [FT-IR], X-ray diffraction spectrophotometer [XRD], and scanning electron microscopy [SEM]. The effect of pH, temperature, time, adsorbent amount, and initial dye concentration were investigated in the removal efficiency of reactive red 198 (RR 198) dyes. The results showed that the maximum adsorption capacity (qm) obtained from the Langmuir equation was 172.41 mg/g in adsorbent dose of 0.1 g/L, pH: 4, temperature of 25 °C, adsorption time of 40 min. The thermodynamic parameters demonstrated the spontaneous and endothermic nature of the adsorption process. Due to the high efficiency of chitosan/ZnO nanocomposite in removal of RR 198 from water and advantages such as high adsorption capacity, simple synthesis, and easy application, it can be used as an effective method in removal of RR 198 from water.

Removal of Cu(II) from aqueous solutions by zinc oxide‐montmorillonite composite

“…As adsorption proceeds, the concentration of Cu(II) in solution decreases and lots of the active sites on the adsorbent surface is occupied by Cu(II), rendering the mass transfer driving force weaker and thereby reducing the rate of Cu(II) adsorption and diffusion. This is consistent with the results interpretation of the chitosan/zinc oxide nanocomposite for the adsorption of active red 198 in water prepared by Amirmahani et al [44].…”

Heterogeneous Sono-Fenton like catalytic degradation of metronidazole by Fe3O4@HZSM-5 magnetite nanocomposite

“…Amounts of the studied parameters were selected according to similar studies. The parameters of the process including the pH [ [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] ], metronidazole concentration (25–100 mg/L), reaction time (5–90 min), nanocomposite dosage (0.1–1 g/L), and amount of H 2 O 2 (0.2–2 mM) were examined and optimized [ 42 , 51 ]. After optimizing the sono-fenton-like process conditions on the synthetic samples, the process has been carried out on the real sample.…”

“…Physical, biological, and chemical methods are used in wastewater treatment plants to remove pollution from domestic and industrial wastewater [ [5] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] ]. Nevertheless, these methods are not effective enough to remove medicine contaminants such as antibiotics [ 19 ].…”

Facile and green synthesis of recyclable, environmentally friendly, chemically stable, and cost-effective magnetic nanohybrid adsorbent for tetracycline adsorption

“…The adsorption process is a promising method for reducing pollutants due to its low operating costs, high flexibility, non-sensitivity to toxic compounds and contaminants, lack of secondary pollution in the system, possibility of adsorbent separation, effectiveness, and high specific surface area for removal of pharmaceutical products [ 29 ], dye compounds [ 30 ], and heavy metals [ 31 ]. The majority of solid porous adsorbents used in adsorption operations have pores that are in the nanoscale range [ 32 ].…”

“…In order to enhance the structure and function of these magnetic nanosorbents, biological substances can be used in their synthesis [ 36 , 37 , 50 ]. Chitin is used to produce the natural amino polysaccharide known as chitosan (Ch) [ 51 , 52 ]. Following cellulose, chitin is the second most prevalent polymer in nature.…”