000 04019nas a2200397 a 4500
005 20260818113237.0
008 230203s2022 th a ||| 000 eng d
035 _a.b12398287
099 9 _aAIT Thesis no.ISE-22-11
100 0 _aSanti Prommajan
245 1 0 _aFabrication of mno2/activated carbon electrodes for heavy metal ions removal from water using capacitive deionization technique
260 _aPathum Thani :
_bAsian Institute of Technology,
_c2022
300 _a75 p. :
_bill.
490 1 _aThesis ;
_vno. ISE-22-11
502 _aThesis (M. Eng.) - Asian Institute of Technology, 2022
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Nanotechnology
520 _aDue to the prevalent global water crisis, susceptibility to heavy metal pollution has become concerning for many communities. As a potential solution, the capacitive deionization (CDI) technique was proposed for its energy and material recovery over the conventional metal removal techniques. In recent works, the adsorption capability is further enhanced with the incorporation of MnO2 into the electrodes for the CDI operation. However, this type of electrode is still limited by its complex synthesis method. In this work, a simpler alternative, cyclic voltammetry electrodeposition, was used to prepare MnO2/activated carbon cloth electrode and the effects of the synthesis conditions on the electrode{u2019}s characteristics were studied. The adsorption capabilities of the electrode in CDI operation were also investigated on various metal species {u2013} chromium, cadmium, copper, and lead {u2013} with varying operating conditions: adsorption of individual metal species with varied applied voltage and flow rate, adsorption from mixtures of multiple metal species, and adsorption under continuous multiple cycle operation. Using cyclic voltammetry for the electrodeposition, the electrode{u2019}s areal capacitance increased with higher depositing scan rate and depositing cycles, reaching 134.51 mF/cm2 at 25 mV/s scan rate and 10 cycles compared to 107.25 mF/cm2 of the raw ACC. The MnO2/ACC electrodes in CDI operation were able to achieve the adsorption capacity of 8.76, 6.48, 3.64, and 3.41 mg/g for Cr3+, Pb2+, Cu2+, and Cd2+ , respectively. The adsorption capacity would reduce with either increased flow rate or decreased applied voltage. For the adsorption from the mixtures of multiple metal species, the adsorption capacity of each species was reduced down to 2.79, 5.26, 3.52, and 1.43 mg/g for Cr3+, Pb2+, Cu2+, and Cd2+, respectively; this is attributed to the high ion activity in the solution. Lastly, for the adsorption under multiple cycles, the adsorption capacity of each species decreased with each cycle. This is believed to be from the lower desorption rate compared to the adsorption rate, reducing the available adsorption capacity in the following cycles.
650 0 _aHeavy metals
_xEnvironmental aspects
650 0 _aElectrodes, Carbon
700 1 _aBora, Tanujjal,
_eChairperson
700 1 _aRicco, Raffaele,
_eExamination committee
700 0 _aChanchana Thanachayanont,
_eExamination committee
710 2 _aHis Majesty the King{u2019}s Scholarships (Thailand),
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. ISE-22-11
856 4 0 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B18185
907 _a.b12398287
_bmnait
_cm
902 _a250421
998 _b0
_c230203
_dm
_ea
_fm
_g0
945 _lmnarc
945 _lmnarc
942 _c67
942 _c40
909 _aBarcode : -
_bCREATED : 2023-01-02
_cRECORD # : i13429012
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050121041676
_bCREATED : 2023-02-13
_cRECORD # : i13432102
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c42744
_d42744