Facile preparation of a polypyrrole modified Chinese yam peel-based adsorbent: characterization, performance, and application in removal of Congo red dye

Yan Wang; Rongyao Chen; Zijing Dai; Qingcai Yu; Yongmei Miao; Ronghua Xu

doi:10.1039/d1ra08280a

Facile preparation of a polypyrrole modified Chinese yam peel-based adsorbent: characterization, performance, and application in removal of Congo red dye

RSC Adv. 2022 Mar 25;12(15):9424-9434. doi: 10.1039/d1ra08280a. eCollection 2022 Mar 21.

Authors

Yan Wang¹, Rongyao Chen¹, Zijing Dai¹, Qingcai Yu¹, Yongmei Miao¹, Ronghua Xu¹

Affiliation

¹ College of Life and Health Sciences, Anhui Science and Technology University Fengyang 233100 China yanwang0129@126.com.

Abstract

In this study, Chinese yam peel (CYP) was modified with polypyrrole via an in situ polymerization method to remove Congo red from aqueous media. The prepared CYP-polypyrrole (CYP-PPy) composite was characterized using FTIR, SEM, TEM, XRD, TG and BET analysis. The performance of CYP-PPy towards the adsorption of Congo red (CR) was explored in batch mode. The removal efficiency of CR was found to be 86% at the initial concentration of 100 mg L^-1, contact time of 120 min, and the adsorbent dosage of 10 g L^-1. At equilibrium time (20 h), the removal efficiency was significantly acceptable (98.9%). The adsorption kinetics data were most consistent with the pseudo-second-order kinetic model. The adsorption equilibrium data could be described well by the Langmuir isotherm model with the maximum adsorption capacity of 86.66 mg g^-1. In view of thermodynamics, the adsorption process was endothermic and more favorable for CR removal at 45 °C. A reusability study indicated that CYP-PPy could be reused effectively for up to three successive cycles of ad-/de-sorption. Hence, this work provides an alternative scheme for the targeted exploitation of agricultural waste to control dye pollution.