eprintid: 19645
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/01/96/45
datestamp: 2024-06-04 14:19:23
lastmod: 2024-06-04 14:19:23
status_changed: 2024-06-04 14:15:31
type: article
metadata_visibility: show
creators_name: Yat, Y.D.
creators_name: Foo, H.C.Y.
creators_name: Tan, I.S.
creators_name: Lam, M.K.
creators_name: Show, P.L.
creators_name: Ng, B.W.L.
title: Synthesis of carbon quantum dots via electrochemically-induced carbon dioxide nanobubbles exfoliation of graphite for heavy metal detection in wastewater
ispublished: pub
keywords: Biocompatibility; Environmental management; Fluorescence quenching; Heavy metals; Metal ions; Nanocrystals; Optical properties; Particle size; Quality management; Quantum yield; Semiconductor quantum dots; Sodium compounds; Sulfur compounds; Surface active agents; Synthesis (chemical); Toxic materials; Transition metals; Water conservation; Water quality, Carbon dioxide nanobubble exfoliation; Carbon quantum dots; Conventional synthesis; Fe 3+; Fe3+ detection; Fluorescence quenching; Heavy metals detection; Nanobubbles; Synthesis method; Synthesized carbon, Carbon dioxide
note: cited By 0
abstract: Carbon quantum dots (CQDs) offer significant promise across industries due to their distinctive optical properties and strong biocompatibility. However, conventional synthesis methods frequently need more precision in controlling nanoparticle size, shape, and uniformity, limiting their versatility in diverse applications. Therefore, this study introduced an innovative approach to synthesising CQDs by combining electrochemical techniques with carbon dioxide (CO2) nanobubbles, circumventing the need for conventional surfactant-based exfoliation. According to the findings, the synthesised CQDs exhibited remarkable properties, including a high quantum yield of 26.17 and an average particle size of 2.24 ± 1.07 nm. Such characteristics render them exceptionally suitable for portable sensors for heavy metal detection in wastewater. Moreover, the investigation revealed the outstanding selectivity of the synthesised CQDs, particularly towards iron (Fe3+) ions, but demonstrated limited reactivity towards lead (Pb2+) and copper (Cu2+) ions. The novel approach also generated non-toxic CQD under the supply of CO2 nanobubbles, which offers a scalable avenue for developing advanced materials for various applications, including sensors for heavy metal ion detection in wastewater. The conventional synthesis method that relied on sodium dodecyl sulphate (SDS) surfactants without CO2 nanobubbles yielded CQDs with a significantly lower quantum yield of 11.2. In short, incorporating CO2 nanobubbles with electrochemical techniques enhanced quantum yield and superior control over the size and shape of the synthesized CQDs. This novel method successfully produced CQDs with scalable distinct morphologies and provided a new understanding of the CQD synthesis mechanism, with potential applications in portable sensing for environmental monitoring and water quality management. © 2024 The Authors
date: 2024
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85189755565&doi=10.1016%2fj.jece.2024.112715&partnerID=40&md5=a4a378824774074272e1bdcba0dcdff4
id_number: 10.1016/j.jece.2024.112715
full_text_status: none
publication: Journal of Environmental Chemical Engineering
volume: 12
number: 3
refereed: TRUE
citation:   Yat, Y.D. and Foo, H.C.Y. and Tan, I.S. and Lam, M.K. and Show, P.L. and Ng, B.W.L.  (2024) Synthesis of carbon quantum dots via electrochemically-induced carbon dioxide nanobubbles exfoliation of graphite for heavy metal detection in wastewater.  Journal of Environmental Chemical Engineering, 12 (3).