PMID- 34091835
OWN - NLM
STAT- MEDLINE
DCOM- 20211026
LR  - 20211026
IS  - 1614-7499 (Electronic)
IS  - 0944-1344 (Linking)
VI  - 28
IP  - 41
DP  - 2021 Nov
TI  - Enhanced sequestration of Cr(VI) onto plant extract anchored on carbon-coated 
      aluminium oxide composite.
PG  - 57723-57738
LID - 10.1007/s11356-021-14694-9 [doi]
AB  - Aluminium oxide (ALU) and carbon-coated aluminium oxide modified with Kigelia 
      africana leaf extract (KECA) were employed for the removal of toxic hexavalent 
      chromium (Cr(VI)) from the aqueous phase. The adsorbents (ALU and KECA) were 
      characterized by TGA, BET, FESEM, FTIR, Raman and XRD spectroscopic techniques. 
      The potential of KECA and ALU to remove Cr(VI) from simulated wastewater was 
      optimum at pH 2, sorbent dose of 0.025 g and a contact time of 200 min. 
      Meanwhile, the uptake capacity of KECA and ALU was enhanced with an increase in 
      sorbent dose, contact time and initial Cr(VI) concentration. The uptake of Cr(VI) 
      onto the adsorbents ALU and KECA was kinetically best described by the 
      pseudo-second-order and Elovich models, respectively. Besides, the equilibrium 
      data acquired for ALU and KECA obeyed Freundlich and Langmuir isotherm models, 
      respectively. ALU and KECA were observed to have optimum adsorption capacity of 
      56.45 mg g(-1) and 258.2 mg g(-1), respectively. The adsorption of Cr(VI) onto 
      the adsorbents was thermodynamically feasible, endothermic in nature and 
      entropy-driven. A decrease in efficiency was observed on regeneration of the 
      absorbents, thus limiting their reusability. However, the presence of functional 
      groups with reducing property in the extract of Kigelia africana leaves was 
      noticed to enhance the capacity of the adsorbent to abstract Cr(VI) from the 
      solution. Hence, this study demonstrates the potential of KECA to sequestrate 
      Cr(VI) from an aqueous solution and provides a reference for its application to 
      the treatment of Cr(VI)-laden industrial wastewater.
CI  - (c) 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, 
      part of Springer Nature.
FAU - Amaku, James Friday
AU  - Amaku JF
AD  - Department of Chemistry, Michael Okpara University of Agriculture, Umudike, 
      Nigeria. amakufj2006@gmail.com.
FAU - Ogundare, Segun A
AU  - Ogundare SA
AD  - Chemical Sciences Department, Olabisi Onabanjo University, Ago-Iwoye, P. M. B. 
      2002, Nigeria.
FAU - Akpomie, Kovo G
AU  - Akpomie KG
AD  - Department of Chemistry, University of the Free State, Bloemfontein, South 
      Africa.
AD  - Department of Pure & Industrial Chemistry, University of Nigeria, Nsukka, 
      Nigeria.
FAU - Conradie, Jeanet
AU  - Conradie J
AD  - Department of Chemistry, University of the Free State, Bloemfontein, South 
      Africa.
LA  - eng
PT  - Journal Article
DEP - 20210606
PL  - Germany
TA  - Environ Sci Pollut Res Int
JT  - Environmental science and pollution research international
JID - 9441769
RN  - 0 (Plant Extracts)
RN  - 0 (Water Pollutants, Chemical)
RN  - 0R0008Q3JB (Chromium)
RN  - 18540-29-9 (chromium hexavalent ion)
RN  - 7440-44-0 (Carbon)
RN  - LMI26O6933 (Aluminum Oxide)
SB  - IM
MH  - Adsorption
MH  - Aluminum Oxide
MH  - *Carbon
MH  - Chromium/analysis
MH  - Hydrogen-Ion Concentration
MH  - Kinetics
MH  - Plant Extracts
MH  - *Water Pollutants, Chemical/analysis
OTO - NOTNLM
OT  - Adsorption
OT  - Chromium (VI)
OT  - Isotherms
OT  - Kigelia africana leaves
OT  - Kinetics
OT  - Regeneration
EDAT- 2021/06/07 06:00
MHDA- 2021/10/27 06:00
CRDT- 2021/06/06 21:18
PHST- 2020/12/23 00:00 [received]
PHST- 2021/05/31 00:00 [accepted]
PHST- 2021/06/07 06:00 [pubmed]
PHST- 2021/10/27 06:00 [medline]
PHST- 2021/06/06 21:18 [entrez]
AID - 10.1007/s11356-021-14694-9 [pii]
AID - 10.1007/s11356-021-14694-9 [doi]
PST - ppublish
SO  - Environ Sci Pollut Res Int. 2021 Nov;28(41):57723-57738. doi: 
      10.1007/s11356-021-14694-9. Epub 2021 Jun 6.