PMID- 35985491 OWN - NLM STAT- MEDLINE DCOM- 20220914 LR - 20221207 IS - 1096-0953 (Electronic) IS - 0013-9351 (Linking) VI - 214 IP - Pt 3 DP - 2022 Nov TI - Polyethylene glycol functionalized reduced graphene oxide coupled with zinc oxide composite adsorbent for removal of phenolic wastewater. PG - 114044 LID - S0013-9351(22)01371-8 [pii] LID - 10.1016/j.envres.2022.114044 [doi] AB - The development of agricultural activities and industrialization recently has various adverse impacts on living organisms. The ever-increasing problem of organic pollution has been an environmental concern to the community. Among these, phenolic pollutants like 2,4-dichlorophenol (2,4-DCP), phenol, 2-chlorophenol (2-CP), and bisphenol-A (BPA) are priority toxic pollutants that are continuously released into environment from many industries. In this work, a biocompatible zinc oxide incorporated polyethylene glycol functionalized reduced graphene oxide composite (RGO-PEG-ZnO) was synthesized and explored for the adsorptive removal of toxic phenolic pollutants from water. The optimized adsorption parameters were solution pH 7, adsorption time 60 min, temperature 25 degrees C, and dosage 0.25 g/L. The isotherms were well fitted by the Langmuir model for BPA and phenol, whereas for 2-CP, and 2,4-DCP, Freundlich was the best-fitted model, and the maximum uptake of BPA, phenol, 2-CP, and 2,4-DCP were 485.756, 511.248, 531.804, 570.641 mg/g, respectively. The kinetic data for all the phenolic pollutants follow the pseudo-second-order model. The thermodynamic analysis shows that Gibb's free energy (DeltaG(o)) values for all the pollutants were negative, confirming that the process was spontaneous. The positive values of change in enthalpy (DeltaH(o)) 28.261, 37.205, 46.182, and 61.682 kJ/mol for BPA, phenol, 2-CP, and 2,4-DCP, respectively, confirm that the above adsorption process was endothermic. The composite can be used for up to five cycles with a small reduction in the removal percentage. Adsorption performance of the synthesized composite for synthetic industrial effluents shows that up to 86.54% removal occurred in 45 min adsorption time. Based on the remarkably rapid adsorption and high adsorption capacity, RGO-PEG-ZnO composite can be considered an efficient adsorbent for treating phenolic pollutants from wastewater. CI - Copyright (c) 2022 Elsevier Inc. All rights reserved. FAU - Rout, Dibya Ranjan AU - Rout DR AD - Department of Chemical Engineering, National Institute of Technology, Rourkela, 769008, Orissa, India. Electronic address: dvrrout@gmail.com. FAU - Jena, Hara Mohan AU - Jena HM AD - Department of Chemical Engineering, National Institute of Technology, Rourkela, 769008, Orissa, India. Electronic address: hara.jena@gmail.com. LA - eng PT - Journal Article DEP - 20220817 PL - Netherlands TA - Environ Res JT - Environmental research JID - 0147621 RN - 0 (Phenols) RN - 0 (Waste Water) RN - 0 (Water Pollutants, Chemical) RN - 0 (graphene oxide) RN - 339NCG44TV (Phenol) RN - 3WJQ0SDW1A (Polyethylene Glycols) RN - 7782-42-5 (Graphite) RN - SOI2LOH54Z (Zinc Oxide) SB - IM MH - Graphite MH - Phenol MH - Phenols MH - Polyethylene Glycols MH - Wastewater MH - *Water Pollutants, Chemical/analysis MH - *Zinc Oxide OTO - NOTNLM OT - Endothermic OT - Organic pollution OT - Phenol OT - Polyethylene glycol OT - Reduced graphene oxide OT - Zinc oxide COIS- Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. EDAT- 2022/08/20 06:00 MHDA- 2022/09/15 06:00 CRDT- 2022/08/19 19:32 PHST- 2022/03/03 00:00 [received] PHST- 2022/07/31 00:00 [revised] PHST- 2022/08/02 00:00 [accepted] PHST- 2022/08/20 06:00 [pubmed] PHST- 2022/09/15 06:00 [medline] PHST- 2022/08/19 19:32 [entrez] AID - S0013-9351(22)01371-8 [pii] AID - 10.1016/j.envres.2022.114044 [doi] PST - ppublish SO - Environ Res. 2022 Nov;214(Pt 3):114044. doi: 10.1016/j.envres.2022.114044. Epub 2022 Aug 17.