TiO2��(f��)��̎��U�Uˮ

��r�g��2009-12-22 15:30 ��Դ��Ї��ˮ̎��W(w��ng) ��: ��x��2541

1 ��򞲿��

1.1 ��Pb2+ˮ��

��Pb(NO3)2��ƣ�Pb2+�ĝ�Ȟ�50mg/L,��

1.2 TiO2��(f��)��Ƃ�[2]

TiCl4��^��м��һ��ӄ�,��(j��ng)΢�V��,��џ��Ƶ�TiO2��(f��)��,��

1.3 ��

ȡ100mLˮ�Ӽ��뵽��У��{(di��o)��Һ��pHֵ,��һ��TiO2��(f��)��º��Q��,��_��һ��r�g��,��Է��ú��^�V,��VҺ��p��ֹ��ȷ��y��е�Pb2+�ĝ��[3]��M��Ӌ��Pb2+��ȥ��,��

Pb2+��ȥ��ʣ�%��= [��ρ0 -ρ��/ρ0]×100%

ʽ��,��ρ0 – ��ǰ��ˮ��Pb2+��|(zh��)��,��mg/L,��
ρ - ��ˮ��Pb2+��|(zh��)��,��mg/L,��

2 �Y(ji��)��cӑՓ

2.1 ��C��

��С��,��^��ıȱ��e,��Ծ��к܏��ú��^��Ԍ��Ⱦ��ȥ,��ͬ�r,��ӄ��ąf(xi��)ͬ��,��܉��ȥ��ʡ�

��ı��控ؓ(f��)늺�,��O��ˮ�Ў��늺ɵ��x��Pb2+��,��l(f��)��ۣ��a(ch��n)��y��ԵĻ��,��@Щ��ٱ��,��ȥ��

2.2 ��r�g��x��

ȡ100 mL ˮ��,��{(di��o)��Һ��pHֵ��8,��菊��ͬ1.3��1.0g,��ͬ��r�g��Pb2+ȥ��ʵ�׃��1��ʾ,��

��1��r�g��Pb²⁺ȥ��ʵ��P(gu��n)ϵ

��r�g/min	5	10	20	30	40	50
Pb²⁺ȥ��/%	50.6	68.5	89.5	95.5	98.2	98.3

�ı�1��Կ��Pb2+��ȥ��ʄ��_ʼ�S��r�g��Ӷ��,��(d��ng)��r�g�_��40min�Ժ�r,��ȥ��_��98.2%��Ժ��,��@�f��Pb2+��ѽ�(j��ng)�_���,��ˣ��ڴ˷��(y��ng)�l��,��r�g��40min,��

2.3 ��x��

ȡ100 mLˮ�ӣ��{(di��o)��Һ��pH��8,��菊��ͬ1.3,��r�g40 min��׃��,��Pb2+ȥ��ʵ�׃��2��ʾ,��

��2 ��Pb²⁺ȥ��ʵ��P(gu��n)ϵ

��r�g/min	0.2	0.4	0.4	0.8	1.0	1.2
Pb²⁺ȥ��/%	78.8	84.5	93.2	97.7	98.2	98.5

�ı�2��Pb2+��ȥ��S��Ӷ��,��(d��ng)��_�� 1.0g�r,��Pb2+ȥ��_��98.2%��Ժ��ӵò��@,��˕r��Pb2+��|(zh��)��Ȟ�50mg/L��ˮ��,��(j��ng)̎��Pb2+��|(zh��)��ѽ�(j��ng)С��1.0mg/L,��ԓ��У��Pb2+�|(zh��)��Ȟ�50mg/L��100mLˮ��,��1.0 g,��

2.4 ��ҺpH��x��

ȡ100mLˮ��,��1.0g��菊��ͬ1.3,��r�g40min,��׃?n��i)�Һ��pH��Pb2+ȥ��ʵ�׃��3��ʾ,��

��3 ��ҺpHֵ��Pb²⁺ȥ��ʵ��P(gu��n)ϵ

��ҺpH	3	4	5	6	7	8	9
Pb²⁺ȥ��	45.5	48.8	57.5	72.5	90.4	98.2	98.3

�ı�3��Կ��,��(d��ng)��Һ��pHֵ��3 ~ 9��Pb2+��ȥ��ʲ��,��ڵ�pH�^(q��)�r,��TiO2�H��Q��,��ڸ�pH�^(q��),��Q��ã��ְ��г��,��ȥ��ʲ��,��^�ߵ�pHֵ�l��£��ɷ��x��y,��ʱ��x��pH��8,��

2.5 TiO2��(f��)��ͻ��̿��^

ȡ100mLˮ�ӣ��菊��ͬ1.3,��r�g40 min,��Һ��pHֵ8��TiO2��(f��)��ͻ��̿��ͬ�ėl��·քe�M��,��Y(ji��)��Ҋ��4,��

��4 TiO2��(f��)��ͻ��̿��^

��/g	0.2	0.4	0.6	0.8	1.0
��ȥ��/ %	78.8	84.5	93.2	97.7	98.2
��̿��ȥ��/%	77.8	84.5	93.1	96.8	98.1

��4�Y(ji��)��f��ͬ��r�£�TiO2��(f��)��Pb2+��ȥ��ձ��ڣ��ஔ(d��ng)�ڣ��̿��Pb2+ȥ��,��(d��ng)Ȼ,��̿��l��ضȡ�pHֵ�ȣ��ܺ�TiO2��(f��)��l��ͬ,��@��ֻ�Ǟ��f��ă�(y��u)Խ,��]��^��о��

4 �Y(ji��)Փ

��TiO2��(f��)��ɹ��M��˺��U�Uˮ��ȥ��,��Pb2+��|(zh��)��Ȟ�50mg/L��100mLˮ��,��1.0g��r�g40min,��ҺpHֵ8,��˕rPb2+��ȥ�� 98.2%��ڻ��ஔ(d��ng)�ڻ��̿��,��

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