大孔型腐植酸树脂的合成及其对重金属离子的螯合性

交联的聚苯乙烯(PS)通过偶氮键—N=N—或酯、醚键与腐植酸(HA)相连接枝得珠状大孔型腐植酸树脂(HAR)。当HA/PSNH_2的重量比为0.7—1.0,PSN_2~+Cl~-偶联PH13时制得的偶氮型腐植酸树脂(AHAR)对重金属离子有优良的吸附性。延长PSCH_2Cl与HA的反应时间可提高酯醚型腐植酸树脂(EHAR)对Cu~(2+)的吸附量。红外光谱探讨了HAR的结构。AHAR的吸附容量为1.01mmol~(2+)Cd/g树脂,对Ni~(2+)、Mn~(2+)、Cu~(2+)、Co~(3+)、Zn~(2+)为0.6—0.53mmol离子/g树脂。重金属离子在AHAR上的分配系数为 Cu~(2+)(8.7×10~3)>Cd~(2+)(3.8×10~2)>Zn~(2+)(2.4×10~2)>Ni~(2+)(1.8×10~2)>Mn~(2+)(4.9×10)。 pH6.5时AHAR能定量吸附Cu~(2+)、Cd~(2+)、Ni~(2+)、Mn~(2+),并能用INHNO_3定量洗脱。AHAR可再生,重复使用,分析了四种天然水、自来水中痕量上述金属离子的浓度。

SYNTHESES OF MACRO-POROUS HUMIC ACID RESINS AND THEIR CHELATING PROPERTIES FOR HEAVY METAL IONS

Macro-porous humic acid resins (HAR) bearing-N=N-bond or ester and/or ether bond were prepared by crosslinked polystyrene derivatives and humic acids. Azo type HAR (AHAR) prepared under HA/PSNH2 0.7-1.0 (wt. ratio) and coupling pH 13 conditions has the best adsorption properties for metal ions. The adsorption quantities for Cu2+ of ester and/or ether type HAR (EHAR) are increasing with increasing reaction time of BHAR formation. The structures of HAR were examined by IR-spectra. Adsorption capacities of AHAR for Cd2+, Ni2+, Mn2+, Cu2+, Co3+, Zn2+ are 1.01, 0.60, 0.59, 0.56, 0.55, 0.53 mmol ion/g resin, respectively. The distribution coefficients of metal ions on AHAR are Cu2+(8.7 × 103) > Cd2+(3.8 × 102) > Zn2+(2.4 × 102) > Ni2+(l.8 × 102) > Mn2+(4.9 × 10), respectively. Cu2+, Cd2+,Ni2+, Mn2+ions can be quantitatively adsorbed and eluated by IN HNO3 with AHAR. The resin can be regenerated and reused. The trace heavy metal ions in four kinds of nature water and tap water have been determined.