TiO2��(f��)��̎��U�Uˮ

��r(sh��)�g��2009-12-22 15:30 ��(l��i)Դ��Ї�(gu��)��ˮ̎��W(w��ng) ��: ��x��2534

1 ��(sh��)�(y��n)��

1.1 ��Pb2+ˮ��

��Pb(NO3)2��,��Pb2+�ĝ�Ȟ�50mg/L��

1.2 TiO2��(f��)��Ƃ�[2]

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

1.3 ��(sh��)�(y��n)

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

Pb2+��ȥ��ʣ�%��= [��ρ0 -ρ��/ρ0]×100%

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

2 �Y(ji��)��cӑՓ

2.1 ��C(j��)��

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

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

2.2 ��r(sh��)�g��x��

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

��1��r(sh��)�g��Pb²⁺ȥ��ʵ��P(gu��n)ϵ

��r(sh��)�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��_(k��i)ʼ�S��r(sh��)�g��Ӷ��ӣ��(d��ng)��r(sh��)�g�_(d��)��40min�Ժ�r(sh��)��ȥ��_(d��)��98.2%,��Ժ��,��@�f(shu��)��Pb2+��ѽ�(j��ng)�_(d��)��͡��,��ڴ˷��(y��ng)�l��,��r(sh��)�g��40min��

2.3 ��x��

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

��2 ��Pb²⁺ȥ��ʵ��P(gu��n)ϵ

��r(sh��)�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)��_(d��)�� 1.0g�r(sh��)��Pb2+ȥ��_(d��)��98.2%,��Ժ��ӵò��@,��˕r(sh��)��(du��)��Pb2+��|(zh��)��Ȟ�50mg/L��ˮ�ӣ��(j��ng)̎��,��Pb2+��|(zh��)��ѽ�(j��ng)С��1.0mg/L,��ԓ��(sh��)�(y��n)�У��(du��)��Pb2+�|(zh��)��Ȟ�50mg/L��100mLˮ��,��1.0 g,��

2.4 ��ҺpH��x��

ȡ100mLˮ�ӣ��1.0g,��菊(qi��ng)��ͬ1.3,��r(sh��)�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(sh��),��TiO2�H��,��Q��ã��ڸ�pH�^(q��),��Q��,��ְ��г��ã��ȥ��ʲ��ߣ��^(gu��)�ߵ�pHֵ�l��,��(hu��)��ɷ��x��y,��ʱ��(sh��)�(y��n)�x��pH��8��

2.5 TiO2��(f��)��ͻ��̿��(sh��)�(y��n)��^

ȡ100mLˮ��,��菊(qi��ng)��ͬ1.3,��r(sh��)�g40 min��Һ��pHֵ8,��TiO2��(f��)��ͻ��̿��ͬ�ėl��·քe�M(j��n)��(sh��)�(y��n),��Y(ji��)��Ҋ(ji��n)��4��

��4 TiO2��(f��)��ͻ��̿��(sh��)�(y��n)��^

��/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(shu��)��ͬ��r��,��TiO2��(f��)��(du��)Pb2+��ȥ��ձ��ڣ��ஔ(d��ng)�ڣ��̿��(du��)��Pb2+ȥ��,��(d��ng)Ȼ��̿��l��ض�,��pHֵ�ȣ��ܺ�TiO2��(f��)��l��ͬ,��@��ֻ�Ǟ��f(shu��)��(sh��)�(y��n)��ă�(y��u)Խ��](m��i)��^(gu��)��о�,��

4 �Y(ji��)Փ

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

����D(zhu��n)�d��ǳ��ڂ��f��Ϣ֮Ŀ�ġ��Ё�(l��i)Դ��(bi��o)ע�e(cu��)�`��ַ��ĺϷ��(qu��n)��,��Ո(q��ng)��߳֙�(qu��n)��C��c��W(w��ng)(li��n)ϵ,��҂��r(sh��)��h��,��x�x,��