Con inuous low Reac o Based on UV LEDs
and TiO2 Suppo ed on Alumina Ce amic
Foam o Pho oca aly ic Deg ada ion o
DBPs
P. Mazie ski, M. Miodyńska-Melze , O. Ca da , A. Pieczyńska, A. Zaleska-Medynska
Depa men o En i onmen al Technology, Facul y o Chemis y, Uni e si y o Gdansk, Wi a S wosza 63 S ee , 80-308 Gdańsk, e-mail: pawel.mazie [email protected]
Disin ec ion by-p oduc s (DBPs) a e a g oup o chemical compounds o med when disin ec an s, pa icula ly chlo ine, a e used o elimina e ha m ul o ganisms such
as bac e ia, i uses, and pa asi es du ing wa e ea men (Richa dson, 2003). This disin ec ion p ocess is essen ial o ensu e he sa e y and po abili y o d inking
wa e (S i as a e al., 2020). Howe e , when disin ec an s eac wi h o ganic and ino ganic ma e ials na u ally p esen in he wa e , hey can unin en ionally c ea e
DBPs, which may pose po en ial heal h isks (Sadiq & Rod iguez, 2004).
Among he a ious echnologies de eloped o mi iga e o emo e DBPs, pho oca alysis using TiO2 has gained a en ion o i s high e iciency, low ene gy
consump ion, and en i onmen ally iendly app oach in deg ading o ganic pollu an s (Go a e al., 2018).
In his s udy, pho oca aly ic deg ada ion o DBPs was in es iga ed o he i s ime using a con inuous- low eac o equipped wi h low-cos UV LEDs and TiO2-coa ed
alumina ce amic oams.
CONCLUSIONS
4 h In e na ional Con e ence on Disin ec ion and DBPs | Oc obe 21s –24 h 2024 | Alme ía, Spain
Acknowledgemen :
The esea ch was unded by he Ho izon Eu ope P og am o he Eu opean Union as pa o he p ojec No. 101081963 “Inno a i e In eg a ed Tools and Technologies o P o ec and T ea
D inking Wa e om Disin ec ion Byp oduc s (DBPs)”, ac onym “H2O o All”.h ps://h2o o all.eu/
Re e ences:
1. Richa dson, S. D. 2003 Disin ec ion by-p oduc s and o he eme ging con aminan s in d inking wa e . T AC T ends in Analy ical Chemis y, 22,666–684.
2. S i as a , A. L., Pa el, N., & Chaudha y, V. K. 2020 Disin ec ion by-p oduc s in d inking wa e : Occu ence, oxici y and aba emen . En i onmen al Pollu ion, 267, 115474.
3. Sadiq, R., & Rod iguez, M. J. 2004 Disin ec ion by-p oduc s (DBPs) in d inking wa e and p edic i e models o hei occu ence: a e iew. The Science o he To al En i onmen , 321,21–46.
4. Go a, S. L., Liang, R., Zhou, Y. N., & And ews, S. A. 2018 Pho oca alysis wi h easily eco e able linea enginee ed TiO2 nanoma e ials o p e en he o ma ion o disin ec ion byp oduc s in d inking wa e .
Jou nal o En i onmen al Chemical Enginee ing, 6, 197–207.
RESULTS AND DISSCUSIONMETHODOLOGY
INTRODUCTION
•The TiO₂-coa ed alumina ce amic oams, wi h nanopa icle sizes anging be ween 30-60 nm, c ea ed a highly ac i e su ace o pho oca alysis, con ibu ing o he sys em's
o e all e iciency.
•The con inuous- low eac o equipped wi h UV LEDs and TiO₂-coa ed alumina ce amic oam demons a ed signi ican pho oca aly ic deg ada ion o DBPs, wi h no iceable
educ ions in he concen a ion o all es ed compounds.
•Among he es ed DBPs, monochlo oace ic acid (MSAA) and 2,4,6- ichlo ophenol (TCP) exhibi ed he highes deg ada ion a es.
•This s udy con i ms ha he combina ion o low-cos UV LEDs and TiO₂-coa ed ma e ials can se e as an e ec i e, scalable, and en i onmen ally iendly solu ion o
mi iga ing he p esence o ha m ul DBPs in wa e ea men p ocesses.
Syn hesis o pho oca aly ic laye s:
•TiO2 was coa ed on he su ace o alumina ce amic oam (Fig. 1) acco ding
o ou pa en applica ion (PCT/PL2021/050011).
•B ie ly, comme cial alumina ce amic oam (100x100x22 mm, po osi y 20 ppi)
was imme sed o 5 min in TiO2 pas e composed o comme cial TiO2 (P25-
Degussa), wa e , PEG 400, T i on X-100 and isop opanol. A e ha excess
pas e was emo ed by blowing wi h a s eam o ni ogen, d ied o 12 h a
60˚C and inally calcined a 450˚C o 3 h.
Figu e 1 – Image o he po ous pho oca aly ic laye , p epa ed in acco dance wi h ou pa en applica ion
(PCT/PL2021/050011)
Pho oca aly ic expe imen s:
•Con inuous low eac o ( olume 2L) wi h in e nal chambe dimensions o
200x100 mm, con aining maximum h ee pho oca aly ic laye s wi h
dimensions o 100x100x22 mm and LED modules (max = 360 nm) was
designed (Fig. 2).
•Con inues low eac o was 3D p in ed using ABS ilamen and connec ed o
a sys em (Fig. 2) enabling he deg ada ion p ocess o be ca ied ou unde
low condi ions (5L ank and pe is a ic pump).
•The p ocesses o pho oca aly ic deg ada ion o monochlo oace ic acid, 4-
chlo o-3-ni ophenol, 4-chlo ophenol, 2,4-dichlo ophenol, 2,4, 6-
ichlo ophenol and 5-chlo osalicylic acid in a con inues- low eac o was
ca ied ou up o 4 h.
•DBPs concen a ion was es ed using a high-pe o mance liquid
ch oma og aph (HPLC, Nexe a XR SIL-20AC by Shimadzu) and ion
ch oma og aph (Me ohm AG 940 P o essional IC Va io).
Figu e 2 – Visualiza ion o con inuous low eac o and sys em enabling he deg ada ion p ocess o be ca ied ou unde
low condi ions
Figu e 3 – SEM images o TiO2 coa ed on alumina ce amic oam wi h po osi y 20 ppi
•As can be seen om Fig. 3 he su ace o alumina ce amic oams was
e ec i ely coa ed wi h TiO2 nanopa icles enabling de eloped su ace o
conduc ing deg ada ion p ocesses.
•The size o TiO2 nanopa icles a ied in he ange o 30-60 nm.
•The e iciency o pho oca aly ic deg ada ion p ocess o selec ed DBPs in a
con inues- low eac o is p esen ed in Fig. 4.
Figu e 4 – Pho oca aly ic deg ada ion o monochlo oace ic acid, 4-chlo o-3-ni ophenol, 4-chlo ophenol, 2,4-
dichlo ophenol, 2,4, 6- ichlo ophenol and 5-chlo osalicylic acid in a con inues- low eac o
