Affiliation:
1. Madan Mohan Malaviya University of Technology
2. Veer Bahadur Singh Purvanchal University
3. Indian Institute of Science Education and Research (IISER)Mohali (140306)
Abstract
Abstract
Three grades of xanthates of β-cyclodextrin (β-CD) viz. β-CDX1 β-CDX2 and β-CDX3 have been synthesized by the rection of β-CD with CS2 in alkaline medium (NaOH), through xanthation process. The synthesized β-CDXs have been characterized by UV, FTIR, 1HNMR, DSC, ΔpHPZC and SEM analysis. Further, β-CDXs and raw β-CD has been used for the heavy metals removal (Cu2+ and Ni2+) and also lignin removal from lignin enriched paper industry wastewater (LEPIW). The maximum % removal of β-CD, β-CDX1, β-CDX2 and β-CDX3 have been found to be 73.6, 91.9, 93.4 & 95.8% for Cu2+ ion and 65.8, 88.6, 91.3 & 94.1% for Ni2+ ion at optimum adsorbent dosage 2.0 g/L, pH 6.5, initial concentration 1000 mg/L, temperature 45 oC for Cu2+ and 55 oC for Ni2+, and contact time: 80 min for Cu2+ and 100 min for Ni2+ ion respectively. While LEPIW treatment efficacy of 54, 77, 83 and 86% has been noticed (initial COD: 2.0 g/L, pH: 7, optimum temperature: 40°C at 80 min operating time) for β-CD, β-CDX1, β-CDX2 and β-CDX3 respectively. The calculated data fitted well with Langmuir isotherm model confirming the adsorption of Cu2+ & Ni2+ ions onto the β-CDXs adsorbent is monolayer. The rate of adsorption of heavy metals (Cu2+ and Ni2+) on the β-CDXs adsorbent has been controlled by kinetic model of Pseudo second order indicating the chemisorption. The optimal adsorption capacities of β-CD, β-CDX1, β-CDX2 and β-CDX3 has been found to be 357.14, 473.93, 510.20 & 534.75 mg/g for Cu2+ and 294.11, 384.61, 408.16 & 423.72 mg/g and for Ni2+ ions, respectively.
Publisher
Research Square Platform LLC
Reference46 articles.
1. A review on magnetic sensors for monitoring of hazardous pollutants in water resources;Hojjati-Najafabadi A;Sci Total Environ
2. Heavy metals causing toxicity in humans, animals and environment;Govind P;Res J Anim Vet Fish Sci,2014
3. New trends in removing heavy metals from industrial wastewater;Barakat MA;Arab J Chem
4. Hina Khatoon, Rai JPN (2016) Agricultural Waste Materials As Biosorbents for the Removal, Octa J. Environ. Res., vol. 4, no. 3, pp. 208–229, [Online]. Available: http://www.sciencebeingjournal.com
5. Removal of heavy metal ions from wastewater: a comprehensive and critical review;Qasem NAA;npj Clean Water,2021