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char = s;code = 115
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result sql = Reactive chlorine species in the enhanced degradation of UV stabilizers during the sunlight/free chlorine process.
Reactive chlorine species in the enhanced degradation of UV stabilizers during the sunlight/free chlorine process.
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char = e;code = 101
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char = s;code = 115
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char = o;code = 111
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char = f;code = 102
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char =  ;code = 8239
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char =  ;code = 8239
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char =  ;code = 8239
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char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = s;code = 115
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = k;code = 107
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 3;code = 51
char = .;code = 46
char = 8;code = 56
char = 1;code = 49
char = 8;code = 56
char =  ;code = 8239
char = ±;code = 177
char =  ;code = 8239
char = 0;code = 48
char = .;code = 46
char = 2;code = 50
char = 4;code = 52
char = 3;code = 51
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = <;code = 60
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = >;code = 62
char = -;code = 45
char = 1;code = 49
char = <;code = 60
char = /;code = 47
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = >;code = 62
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = B;code = 66
char = T;code = 84
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 7;code = 55
char = .;code = 46
char = 7;code = 55
char = 5;code = 53
char = 4;code = 52
char =  ;code = 8239
char = ±;code = 177
char =  ;code = 8239
char = 0;code = 48
char = .;code = 46
char = 7;code = 55
char = 1;code = 49
char = 6;code = 54
char = ;code = 32
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = <;code = 60
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = >;code = 62
char = -;code = 45
char = 1;code = 49
char = <;code = 60
char = /;code = 47
char = s;code = 115
char = u;code = 117
char = p;code = 112
char = >;code = 62
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = 5;code = 53
char = -;code = 45
char = M;code = 77
char = e;code = 101
char = B;code = 66
char = T;code = 84
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = H;code = 72
char = ;code = 32
char = 9;code = 57
char = );code = 41
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = n;code = 110
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = o;code = 111
char = b;code = 98
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = n;code = 110
char = l;code = 108
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = /;code = 47
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = e;code = 101
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = u;code = 117
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = g;code = 103
char = e;code = 101
char = n;code = 110
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = H;code = 72
char = O;code = 79
char = •;code = 8226
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = R;code = 82
char = C;code = 67
char = S;code = 83
char = s;code = 115
char = );code = 41
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = c;code = 99
char = h;code = 104
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = •;code = 8226
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = O;code = 79
char = •;code = 8226
char = .;code = 46
char = ;code = 32
char = U;code = 85
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = l;code = 108
char = k;code = 107
char = a;code = 97
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = d;code = 100
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = R;code = 82
char = C;code = 67
char = S;code = 83
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = i;code = 105
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = b;code = 98
char = u;code = 117
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 2;code = 50
char = 1;code = 49
char = .;code = 46
char = 2;code = 50
char = %;code = 37
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 9;code = 57
char = 8;code = 56
char = .;code = 46
char = 7;code = 55
char = %;code = 37
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = r;code = 114
char = e;code = 101
char = a;code = 97
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char = e;code = 101
char = s;code = 115
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = H;code = 72
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 7;code = 55
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 9;code = 57
char = ;;code = 59
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
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char = p;code = 112
char = h;code = 104
char = e;code = 101
char = n;code = 110
char = o;code = 111
char = m;code = 109
char = e;code = 101
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = c;code = 99
char = h;code = 104
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = s;code = 115
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = B;code = 66
char = T;code = 84
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = R;code = 82
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = g;code = 103
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = f;code = 102
char = u;code = 117
char = r;code = 114
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = f;code = 102
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = B;code = 66
char = T;code = 84
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = l;code = 108
char = y;code = 121
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char = d;code = 100
char = e;code = 101
char = c;code = 99
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char = m;code = 109
char = p;code = 112
char = o;code = 111
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = O;code = 79
char = •;code = 8226
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = C;code = 67
char = l;code = 108
char = O;code = 79
char = •;code = 8226
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char = s;code = 115
char = h;code = 104
char = o;code = 111
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char = e;code = 101
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char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
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char = r;code = 114
char = e;code = 101
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = i;code = 105
char = t;code = 116
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char = a;code = 97
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char = e;code = 101
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char = t;code = 116
char = h;code = 104
char = r;code = 114
char = o;code = 111
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char = r;code = 114
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char = a;code = 97
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char = a;code = 97
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char = i;code = 105
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char = ;code = 32
char = A;code = 65
char = ;code = 32
char = b;code = 98
char = y;code = 121
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char = r;code = 114
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char = d;code = 100
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char = d;code = 100
char = e;code = 101
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char = o;code = 111
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char = s;code = 115
char = t;code = 116
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char = a;code = 97
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char = e;code = 101
char = d;code = 100
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char = t;code = 116
char = h;code = 104
char = a;code = 97
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char = B;code = 66
char = T;code = 84
char = ;code = 32
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = r;code = 114
char = w;code = 119
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char = t;code = 116
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char = h;code = 104
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char = x;code = 120
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char = a;code = 97
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char = b;code = 98
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char = g;code = 103
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char = e;code = 101
char = l;code = 108
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char = o;code = 111
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char = ;code = 32
char = 1;code = 49
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char = o;code = 111
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char = (;code = 40
char = 1;code = 49
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char = C;code = 67
char = l;code = 108
char = B;code = 66
char = T;code = 84
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char = f;code = 102
char = o;code = 111
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char = m;code = 109
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char = a;code = 97
char = s;code = 115
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char = o;code = 111
char = b;code = 98
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char = e;code = 101
char = r;code = 114
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = .;code = 46
char = ;code = 32
char = E;code = 69
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = h;code = 104
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result sql = Benzotriazole (BT) and 5-methyl-1H-benzotriazole (5-MeBT) are the most commonly used UV stabilizers and recalcitrant contaminants that are widely distributed in aquatic environments. The novelty of this study was to investigate the role of RCSs in the enhanced degradation of BT and 5-MeBT during the sunlight/free chlorine process. The results showed that sunlight/free chlorine could enhance the degradation of BT and 5-MeBT compared with that obtained with sunlight irradiation and chlorination alone, and this process was well described by pseudo-first-order kinetics. The degradation rate constants of BT and 5-MeBT during sunlight/free chlorine treatment at pH 7 were 0.094  ±  0.001 min-1 and 0.134  ±  0.002 min-1, respectively. The degradation rates further increased with increases in the chlorine dosage and under alkaline conditions (3.818  ±  0.243 min-1 for BT and 7.754  ±  0.716 min-1 for 5-MeBT at pH 9). The enhanced removal obtained during the sunlight/free chlorine process could be attributed to the generation of HO•• and reactive chlorine species (RCSs), such as Cl•• and ClO••. Under alkaline conditions, RCSs were the dominant reactive species, and their contribution increased from 21.2% to 98.7% with increases in the pH from 7 to 9; this phenomenon was due to changes in free chlorine and BT speciation. Radical scavenging tests further verified that BT was mainly decomposed by ClO••, and ClO•• showed high reactivity toward deprotonated BT through second-order rate constant estimation. A byproduct analysis demonstrated that BT underwent hydroxylation and chlorine substitution, and a high yield of 1-chlorobenzotriazole (1-ClBT) formation was observed. Even though the sunlight/free chlorine process resulted in a low level of mineralization, no Microtox® toxicity was detected in the treated solutions. Briefly, the significant contribution of ClO•• to BT removal under alkaline conditions implies that sunlight/free chlorine could be utilized in a broader range of treatment conditions.


Publication: Chemosphere 2022 Sep:136677.
Publication Date: Sep 2022
Study Author(s): Choo Zhen-Shuen ZS ; Hsieh Ming-Chi MC ; Hui-Hsiang Lin Hank H ; Yang Jheng-Sian JS ; Yu-Chen Lin Angela A ;
Institution: Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei, 106, Taiwan.
Shortcut link to this study:
Benzotriazole (BT) and 5-methyl-1H-benzotriazole (5-MeBT) are the most commonly used UV stabilizers and recalcitrant contaminants that are widely distributed in aquatic environments. The novelty of this study was to investigate the role of RCSs in the enhanced degradation of BT and 5-MeBT during the sunlight/free chlorine process. The results showed that sunlight/free chlorine could enhance the degradation of BT and 5-MeBT compared with that obtained with sunlight irradiation and chlorination alone, and this process was well described by pseudo-first-order kinetics. The degradation rate constants of BT and 5-MeBT during sunlight/free chlorine treatment at pH 7 were 0.094  ±  0.001 min-1 and 0.134  ±  0.002 min-1, respectively. The degradation rates further increased with increases in the chlorine dosage and under alkaline conditions (3.818  ±  0.243 min-1 for BT and 7.754  ±  0.716 min-1 for 5-MeBT at pH 9). The enhanced removal obtained during the sunlight/free chlorine process could be attributed to the generation of HO•• and reactive chlorine species (RCSs), such as Cl•• and ClO••. Under alkaline conditions, RCSs were the dominant reactive species, and their contribution increased from 21.2% to 98.7% with increases in the pH from 7 to 9; this phenomenon was due to changes in free chlorine and BT speciation. Radical scavenging tests further verified that BT was mainly decomposed by ClO••, and ClO•• showed high reactivity toward deprotonated BT through second-order rate constant estimation. A byproduct analysis demonstrated that BT underwent hydroxylation and chlorine substitution, and a high yield of 1-chlorobenzotriazole (1-ClBT) formation was observed. Even though the sunlight/free chlorine process resulted in a low level of mineralization, no Microtox® toxicity was detected in the treated solutions. Briefly, the significant contribution of ClO•• to BT removal under alkaline conditions implies that sunlight/free chlorine could be utilized in a broader range of treatment conditions.

PMID: 36191762

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