Degradation of n-butyl benzyl phthalate using TiO2/UV.
n-Butyl benzyl phthalate (BBP) has been classified as endocrine disrupting compound and priority pollutant. Effects of TiO(2) dosage, pH, initial BBP concentration and co-existing substances on the degradation of BBP by TiO(2)/UV process were investigated. The optimal TiO(2) dosage and pH value for the BBP degradation were 2.0gL(-1) and 7.0, respectively. The degradation rate of BBP by TiO(2)/UV process could be fitted pseudo-first-order kinetics. The effects of co-existing substances on the degradation rate of BBP revealed that some anions (such as BrO(3)(-), ClO(4)(-) and Cr(2)O(7)(2-)) could enhance BBP degradation, and other anions would restrain BBP degradation. The sequence of inhibition was PO(4)(3-)>CO(3)(2-)>NO(3)(-)>SO(4)(2-)>Cl(-). The cations K(+), Na(+), Mg(2+) and Ca(2+) had the restrained effect on the BBP degradation, and the effect of Ca(2+) was the strongest among four cations tested. The organic compounds acetone and methanol decreased the degradation rate of BBP. The major intermediates of BBP degradation were identified as mono-butyl phthalate, mono-benzyl phthalate and phthalic acid, and a primary degradation mechanism was proposed.
Xu
Xiang-Rong
XR
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China.
Li
Shen-Xin
SX
Li
Xiao-Yan
XY
Gu
Ji-Dong
JD
Chen
Feng
F
Li
Xiang-Zhong
XZ
Li
Hua-Bin
HB
D000838:Anions; D002412:Cations; D052244:Endocrine Disruptors / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010795:Phthalic Acids / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects; D014025:Titanium; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
D000838:Anions; D002412:Cations; D052244:Endocrine Disruptors; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C103325:mono-benzyl phthalate; D014025:Titanium