氨基(β-羟基)甲酸酯与亚磺酸酯树脂的合成及其对贵金属离子的吸附性

合成了八种氨基(β 羟基)甲酸酯树脂与氨基(β-羟基)亚磺酸酯树脂。探讨了溶剂、试剂摩尔比、反应温度与时间对制得的树脂功能基含量、吸附容量的影响.在一定的pH及酸度范围内,在杂质离子Ni~(2+)、Cu~(2+)、Zn~(2+)、Mn~(2+)、Cd~(2+)存在下,树脂5高选择性地定量吸附Au(Ⅲ);树脂对Au(Ⅲ)、Pt(Ⅳ)、Pd(Ⅱ)有选择吸附性。     

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/PSNH2的重量比为0.7—1.0,PSN2+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Cu2+的吸附量。红外光谱探讨了HAR的结构。AHAR的吸附容量为1.01mmol2+Cd/g树脂,对Ni2+、Mn2+、Cu2+、Co3+、Zn2+为0.6—0.53mmol离子/g树脂。重金属离子在AHAR上的分配系数为 Cu2+(8.7×103)>Cd2+(3.8×102)>Zn2+(2.4×102)>Ni2+(1.8×102)>Mn2+(4.9×10)。 pH6.5时AHAR能定量吸附Cu2+、Cd2+、Ni2+、Mn2+,并能用INHNO3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。     

含亚硫酸乙烯酯和碳酸乙烯酯功能基树脂的合成及其对贵金属离子的选择吸附性

制备了高功能基转化率的孪二羟基树脂,由此合成了含亚硫酸乙烯酯功能基(2.30毫摩尔/克树脂)和碳酸乙烯酯功能基(2.57毫摩尔/克树脂)的树脂4和5。在酸度范围内树脂4选择吸附Pt(Ⅱ),两者对Au(Ⅲ) 有高选择吸附性,而很少吸附共存的Pd(Ⅱ)、Pt(Ⅳ)及铁、钴、镍、铜、锰、锌、铅、镉等二价金属离子。树脂4对金的吸附容量为126(毫克 Au(Ⅲ)/克树脂),分配系数Kd为824(毫升/克),一次洗脱率达85％。树脂5的吸附容量为46.0(毫克 Au(Ⅲ)/克树脂),Kd为84.1(毫升/克)。两种树脂吸附Au(Ⅲ)的速率T_(1/2)分别为1、0.8小时.     

SYNTHESIS OF MACROPOROUS HUMIC ACID RESINS AND THEIR CHELATING PROPERTIES FOR HEAVY METAL IONS

Macroporous HA resins (HAR) can be prepared in pearl form by grafting HA onto crosslinked PS through azo or through ester and / or ether linkages. At pH 13 and the HA / PSNH2 weight ratio 0.7—1.0, PSN2+Cl-couples with HA and results in the formation of a7o-type HA resin (HAR-A), which shows good adsorbility towards heavy metal ions. The Cu2+ sorption capacity of ester / ether type humic acid resin (HAR-E) is increased by lengthening the reaction time of HA and PSCH2Cl. The structure of HAR is discussed on the basis of the IR spectra.The sorption capacity of HAR-A is 1.01mmol/g for Cd2+,Mn2+,Cu2+,Co2+and Zn2+,respectively.The calculated distribution coefficents of heavy metal ions on HAR-A can be arranged in the following order;Cu2+(8.7×103)>Cd2(3.8×102)>Zn2+(2.4×102)>Ni2+(1.8×102)>Mn2+(4.9×10).At pH 6.5,Cu2+,Cd2+,Ni2+,Mn2+ can be quantitatively asdorbed by HAR-A and completely eluted with 1N HNO3.HAR-A can be regenerated and reused.Trace quantities of the above-mentioned heavy metal ions in four samples of the natural occurring water and one sample of the tap water were analyzed by using HAR-A.