ADSORPTION OF ZINC ON COLLOIDAL (HYDR)OXIDES OF SI, AL AND FE IN THE PRESENCE OF A FULVIC-ACID
ADSORPTION OF ZINC ON COLLOIDAL (HYDR)OXIDES OF SI, AL AND FE IN THE PRESENCE OF A FULVIC-ACID
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DOI：
10.1016/0883-2927(94)00052-8
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发表时间：
1995-03-01
影响因子：
3.4
通讯作者：
ALLARD, B
中科院分区：
文献类型：
--
作者：
DUKER, A;LEDIN, A;ALLARD, B
通过间歇技术，在恒定离子强度 (0.01 M) 条件下，研究了 Zn（总浓度 10(-6) M）在胶体石英、水铝矿和针铁矿（分别为 50、300 和 70 mg/l）上的吸附，但 pH 值（3-10）和黄腐酸（FA）浓度（0、2 或 20 mg/l）发生变化。在没有 FA 的情况下，所有系统中的吸附都具有类似的 pH 依赖性，在这些条件下，pH(50)（50% 吸附的 pH）为 7.6。 FA 的存在降低了对石英的总体吸附（2 mg FA/I 时的 pH(50) 为 7.9，20 mg/l 时的 pH(50) 为 9.3），并且在 2 mg FA/I 的水铝矿和针铁矿系统中，吸附曲线向下移动（pH(50) 为 6.8）。当 FA/I 为 20 mg 时，后两个系统中的吸附在 pH 6.5 时增加。结果反映了表面对 FA 的亲和力以及 Zn-FA 复合物的形成（在溶液中和在固体表面上）。
The adsorption of Zn (total concentration 10(-6) M) to colloidal quartz, hydrargillite and goethite (50, 300 and 70 mg/l, respectively) was studied by a batch technique at a constant ionic strength (0.01 M) but with variation of pH (3-10) and fulvic acid (FA) concentration (0, 2 or 20 mg/l). The adsorption had similar pH-dependence in all systems in the absence of FA giving a pH(50) (PH of 50% adsorption) of 7.6 under these conditions. The presence of the FA reduced the overall adsorption to quartz (pH(50) Of 7.9 at 2 mg FA/I and 9.3 at 20 mg/l) and shifted the adsorption curves downwards (pH(50) Of 6.8) in the hydrargillite and goethite systems at 2 mg FA/I. At 20 mg FA/I, the adsorption in the two latter systems was increased at pH 6.5. The results reflect the affinity of the surfaces for FA as well as the formation of Zn-FA complexes (in solution and on solid surfaces).