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对SA在氯化钙溶液中的成球特性进行了研究,并且添加铁、铝、铜等金属离子制备成SA-Ca-Fe等凝胶球.采用FTIR、TG等仪器对凝胶球的结构和形态进行了表征.凝胶球的颜色取决于金属离子,直径为3~4mm,含水率为94%~96%.研究了不同金属离子的SA-Ca凝胶球吸附Cr2O72-的特性.结果表明:反应3h后,SA-Ca、SA-Ca-Co、SA-Ca-Ni凝胶球对Cr2O72-几乎没有吸附能力;SA-Ca-Cu、SA-Ca-Al凝胶球对Cr2O72-吸附能力较小,而SA-Ca-Fe凝胶球对Cr2O72-的去除率达到93%,准二级吸附动力学方程可很好地描述各类凝胶球的吸附过程.

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