The Impact of Surface Properties and Dominant Ions on the Effectiveness of G-nZVI Heterogeneous Catalyst for Environmental Remediation

Overview

Journal Sci Total Environ

Date 2018 Oct 27

PMID 30360250

Authors

Usman Farooq

Muhammad Danish

Shuguang Lyu

Mark L Brusseau

Mengbin Gu

Waqas Qamar Zaman

Zhaofu Qiu

Qian Sui

Affiliations

Soon will be listed here.

Abstract

The surface properties of nanocomposites are influenced by the existence of inorganic species that may affect its performance for specific catalytic applications. The impact of different ionic species on particular catalytic activity had not been investigated to date. In this study, the surface charge (zeta potential) of graphene-oxide-supported nano zero valent iron (G-nZVI) was tested in definitive cationic (Na, K, Ca and Mg) and anionic (Br, Cl, NO, SO, and HCO) environments. The efficiency of G-nZVI catalyst was inspected by measuring the generation of reactive oxygen species (ROS) for the degradation of 1,1,1-trichloroethane (TCA) in sodium percarbonate (SPC) system. Tests conducted using probe compounds confirmed the generation of OH and O radicals in the system. In addition, the experiments performed using scavenging agents certified that O were primary radicals responsible for TCA removal, along with prominent contribution from OH radicals. The study confirmed that G-nZVI catalytic capability for TCA degradation is notably affected by various cationic species. The presence of Ni and Cu significantly enhanced (94%), whereas Na and K had minor effects on TCA removal. Overall, the results indicated that groundwater ionic composition may have low impact on the effectiveness of G-nZVI-catalyzed peroxide TCA treatment.

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