Functionalization of mesoporous carbons derived from pomelo peel as capacitive electrodes for preferential removal/recovery of copper and lead from contaminated water

Lu，Jiming1,2; Kumar Mishra，Prashant2; Hunter，Timothy N.2; Yang，Fan3; Lu，Zhouguang1; Harbottle，David2; Xu，Zhenghe1

2022-04-01

10.1016/j.cej.2022.134508

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

Water is not only a valuable resource that is needed to sustain life, but also an essential ingredient in many engineering processes, which unavoidably leads to large volumes of water being contaminated. To achieve safe discharge and also recover valuable “pollutants”, better performing sorbents are needed to rapidly and efficiently decontaminate water while generating minimal secondary wastes. Bio-sorbents derived from pomelo peel were functionalized with pyrrolic-N (BNC-5 electrode) and pyridinic-N (BNC-6 electrode) to enhance electroadsorption and selectivity of Pb and Cu. The interaction between soft acid ions (Pb) and soft base sites (pyrrolic-N) contributed to a strong chemisorption that elevated the electroadsorption capacity to 2.0 mmol g for Pb at an applied voltage of 1.2 V. With fast removal kinetics (0.077 g mg min of Pb), the BNC-5 sorbent performed comparably to other N-doped sorbents prepared using graphene. The large adsorption–desorption hysteresis of BNC-5 in responding to the applied electric voltage confirmed the nature of chemisorption. The results showed only 32.4% of the adsorbed ions being desorbed from the sorbent by reducing the applied voltage to 0 V, but reached almost complete desorption (98.5% of adsorbed ions) at –0.8 V. When operated in adsorption–desorption cycle mode, BNC-5 after ∼ 400 cycles maintained a capacity retention ≥ 80%. After 400 cycles, the electrode capacity was almost fully restored (98.7%) by only mild chemical washing (0.1 M HNO) of the sorbent and the cycling performance maintained. The study demonstrated the robustness of the sorbent over 1200 cycles and hence the potential to successfully convert waste into high-performance materials for large-scale remediation strategies of contaminated wastewater using CDI.

Bio-based sorbent Capacitive deionization Heavy metal ions Ion selectivity

SCI ; EI

英语

第一

Shenzhen Science and Technology Innovation Commission[ZDSYS20200421111401738] ; Leading Talents of Guangdong Province Program[2016LJ06C536] ; SUSTech[EP/S032797/1] ; Engineering and Physical Sciences Research Council (EPSRC)[51974162,21808101] ; National Nat-ural Science Foundation of China[20200207]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000786608300006

ELSEVIER SCIENCE SA

20220311466138

Chemicals removal (water treatment) ; Chemisorption ; Copper ; Desorption ; Doping (additives) ; Electric discharges ; Electrodes ; Lead compounds ; Metal ions ; Sorbents

Industrial Wastes:452.3 ; Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Copper:544.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Chemical Reactions:802.2 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804

ENGINEERING

2-s2.0-85122655337

Scopus

1.Shenzhen Key Laboratory of Interfacial Science and Engineering of Materials,Department of Materials Science & Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Chemical and Process Engineering,University of Leeds,Leeds,LS2 9JT,United Kingdom
3.College of New Materials and New Energies,Shenzhen Technology University,Shenzhen,518118,China

Lu，Jiming,Kumar Mishra，Prashant,Hunter，Timothy N.,et al. Functionalization of mesoporous carbons derived from pomelo peel as capacitive electrodes for preferential removal/recovery of copper and lead from contaminated water[J]. CHEMICAL ENGINEERING JOURNAL,2022,433.

Lu，Jiming.,Kumar Mishra，Prashant.,Hunter，Timothy N..,Yang，Fan.,Lu，Zhouguang.,...&Xu，Zhenghe.(2022).Functionalization of mesoporous carbons derived from pomelo peel as capacitive electrodes for preferential removal/recovery of copper and lead from contaminated water.CHEMICAL ENGINEERING JOURNAL,433.

Lu，Jiming,et al."Functionalization of mesoporous carbons derived from pomelo peel as capacitive electrodes for preferential removal/recovery of copper and lead from contaminated water".CHEMICAL ENGINEERING JOURNAL 433(2022).