Sustainable remediation of toxic congo red dye pollution using bio based carbon nanocomposite: Modelling and performance evaluation

被引:10
|
作者
Gopalakrishnan S. [1 ]
Kannan P. [2 ]
Balasubramani K. [3 ]
Rajamohan N. [4 ]
Rajasimman M. [5 ]
机构
[1] Department of Food Technology, Dhanalakshmi Srinivasan College of Engineering, Coimbatore
[2] Department of Chemistry, V.S.B. College of Engineering Technical Campus, Coimbatore
[3] Department of Chemical Engineering, Hindusthan College of Engineering and Technology, Valley Campus, Coimbatore
[4] Chemical Engineering Section, Faculty of Engineering, Sohar University, Sohar
[5] Department of Chemical Engineering, Annamalai University, Annamalai Nagar
关键词
Biodegradation; Bionanocomposite; Chitosan; Congo red; Dye remediation; Efficiency; Zinc oxide;
D O I
10.1016/j.chemosphere.2023.140206
中图分类号
学科分类号
摘要
Remediation of synthetic dyes found in aqueous environment poses a serious challenge for treatment due to their resistance to chemical and biological degradation. This research study investigated the application of Chitosan-ZnO-Seaweed bio nanocomposite in the remediation of congo red. The novel bionanocomposite was characterised by FTIR, SEM, TEM, EDS and XRD studies. The FTIR spectra and SEM images indicated the adsorption of congo red onto the synthesized bionanocomposite. The batch wise experimental studies were done to explore the influence of process variables on removal of congo red from synthetic wastewater and to determine optimized conditions. Under optimized conditions of pH 3, temperature 40 °C, initial congo red concentration 50 mg/L, bionanocomposite quantity 0.03 g/L and interaction period 30 min, the bionanocomposite removed 95.64% of congo red. Thermodynamic studies were carried out and the parameters, ΔH° and ΔS° were found to be 38.386 kJ/mol and 0.1451 kJ/mol. K, respectively. The isotherm and kinetic study showed that monolayer Langmuir model was obeyed (R2 = 0.968) and the experimental value of congo red adsorption correlated well with pseudo second order model (R2 = 0.9938) respectively. The maximum adsorption capacity was found to be 303.03 mg/g. Protonated amino group of chitosan, hydroxyl group of seaweed accounts for congo red adsorption along with zinc oxide. © 2023 Elsevier Ltd
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