二硫代羧基化羟甲基聚丙烯酰胺与Cu<sup>2+</sup>的螯合稳定性

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Abstract A heavy metal floccutant dithiocarboxyl hydroxymethy-polyacrylamide (DTMPAM) was prepared by using polyacrylamide, formaldehyde, sodium hydroxide and carbon disulfide as raw materials. The absorption spectra of the chelate formed between DTMPAM and Cu²⁺ was determined by UV spectrophotometry under different Cu²⁺ concentrations, dithiocarboxyl groups (—CSS^-) concentrations and pH values. The coordination ratio of the chelate was discussed, the stability of the chelate DTMPAM-Cu at different pH values and different —CSS^- concentrations was investigated, and its stability constant was calculated. The results showed that the maximum absorption peaks of DTMPAM appeared at 207 and 226nm, but the maximum absorption peaks of chelate DTMPAM-Cu appeard at 220 and 260nm, respectively. Compared with the absorption peaks of DTMPAM, the maximum absorption peaks of chelate DTMPAM-Cu occurred red shifting. Under different —CSS^- concentrations (3.0×10^-5~6.0×10^-5mol/L) and pH values (3.0~9.0), the chelating ratio of DTMPAM and Cu²⁺ was 2:1. When the —CSS^- concentration was 3.0x10^-5~6.0×10^-5mol/L, the chelation stability constant lgβ₂ of DTMPAM-Cu was between 10.5725~11.4473; with the increase of —CSS^- concentration, the chelating stability constant decreased slightly. At different pH values, the chelation stability constants of DTMPAM-Cu were different, when the pH value was 3.0~5.0, the stability constant of DTMPAM-Cu increased gradually with the increase of pH value. When the pH value was 6.0~9.0, the stability constant of DTMPAM-Cu decreased slightly.

Key words： ultraviolet spectrophotometric method stability constant chelate dithiocarboxyl copper

Received: 18 November 2020

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X703

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	YAN Ya-ping
	WANG Gang
	WANG Lu-lu
	ZHOU Ya-qi

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YAN Ya-ping,WANG Gang,WANG Lu-lu等. Chelating stability of dithiocarboxyl hydroxymethy-polyacrylamide with Cu²⁺[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3266-3274.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3266

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