Clay-moringa seedcake composite for removal of cationic and anionic dyes

被引:6
作者
Rawat S. [1 ]
Ahammed M.M. [1 ]
机构
[1] Department of Civil Engineering, Sardar Vallabhbhai National Institute of Technology, Surat
关键词
Acid orange-7; Adsorption; Clay-biomass composites; Dye wastewater; Methylene blue; Moringa oleifera; Textile wastewater;
D O I
10.1016/j.chemosphere.2023.141083
中图分类号
学科分类号
摘要
The present study investigated the potential of a composite prepared from kaolinite clay and moringa seedcake in removing methylene blue (MB) and acid orange-7 (AO-7) dyes from aqueous solutions using batch and column tests. The composite was modified using different chemicals during the synthesis process, and the composites were characterised using different techniques such as FTIR, SEM-EDS and XRD. Characterisation showed the presence of actively charged functional groups and porous structure on the composites prepared. Batch tests were performed to assess the effect of operating conditions such as adsorbent dosage, pH, initial dye concentration and contact time. NaOH-modified and H2SO4/NaOH-modified composites demonstrated the highest adsorption capacities for AO-7 and MB, respectively, and were selected for subsequent studies. The adsorption process of dye was best fitted by the Freundlich isotherm and pseudo-second-order kinetic models suggesting that the sorption of MB and AO-7 onto the composites is a heterogeneous, multilayer chemical adsorption process. Long-term fixed-column tests were conducted with the composites to assess the impact of flow rate, bed depth and initial dye concentration on the dye removal efficiency. Optimum removals of 86 and 94%, respectively at pH 2 and pH 10 were obtained for AO-7 and MB in batch tests, along with adsorption capacities of 205.65 and 230.49 mg/g for AO-7 and MB. Results from the column tests were best explained by the Clark model and the Bed Depth-Service Time model. Competing ions impacted the removal of AO-7, while no significant effect was found for MB. The composites could be reused up to four cycles without significantly affecting the adsorption capacity. The present study thus shows the potential of the composite for removal of both the dyes. © 2023 Elsevier Ltd
引用
收藏
相关论文
共 59 条
[41]  
Olu-Owolabi B.I., Diagboya P.N., Unuabonah E.I., Alabi A.H., During R.A., Adebowale K.O., Fractal-like concepts for evaluation of toxic metals adsorption efficiency of feldspar-biomass composites, J. Clean. Prod., 171, pp. 884-891, (2018)
[42]  
Patel H., Comparison of batch and fixed bed column adsorption: a critical review, Int. J. Environ. Sci. Technol., 19, pp. 10409-10426, (2022)
[43]  
Premarathna K.S.D., Rajapaksha A.U., Adassoriya N., Sarkar B., Sirimuthu N.M.S., Cooray A., Ok Y.S., Vithanage M., Clay-biochar composites for sorptive removal of tetracycline antibiotic in aqueous media, J. Environ. Manag., 238, pp. 315-322, (2019)
[44]  
Qhubu M.C., Mgidlana L.G., Madikizela L.M., Pakade V.E., Preparation, characterization and application of activated clay biochar composite for removal of Cr(VI) in water: isotherms, kinetics and thermodynamics, Mater. Chem. Phys., 260, (2021)
[45]  
Raghu S., Ahmed Basha C., Chemical or electrochemical techniques, followed by ion exchange, for recycle of textile dye wastewater, J. Hazard Mater., 149, pp. 324-330, (2007)
[46]  
Rawat S., Ahammed M.M., Clay-biomass composites for water purification, Journal of Hazard, Toxic, and Radioactive Waste, 26, (2022)
[47]  
Rawat S., Ahammed M.M., Dye removal by clay-pumpkin seed cake composite: modelling and optimization, Int. J. Environ. Sci. Technol., 20, pp. 12481-12498, (2023)
[48]  
Safarzadeh H., Peighambardoust S.J., Mousavi S.H., Foroutan R., Mohammadi R., Peighambardoust S.H., Adsorption ability evaluation of the poly(methacrylic acid-co-acrylamide)/cloisite 30B nanocomposite hydrogel as a new adsorbent for cationic dye removal, Environ. Res., 212, (2022)
[49]  
Saha P.D., Chakraborty S., Chowdhury S., Batch and continuous (fixed-bed column) biosorption of crystal violet by Artocarpus heterophyllus (jackfruit) leaf powder, Colloids Surf. B Biointerfaces, 92, pp. 262-270, (2012)
[50]  
Sardabi F., Azizi M.H., Gavlighi H.A., Rashidinejad A., Potential benefits of Moringa peregrina defatted seed: effect of processing on nutritional and anti-nutritional properties, antioxidant capacity, in vitro digestibility of protein and starch, and inhibition of α-glucosidase and α-amylase enzymes, Food Chemistry Advances, 1, (2022)