Purpose

Different amendments have diverse adsorption capacity for heavy metals. The objectives of this study were to evaluate adsorption efficiency of different kinds of amendments for heavy metals and to provide theoretical guidance for alleviation of heavy metals.

Materials and methods

The indoor oscillating experiments were carried out to investigate the adsorption efficiency of five amendments (i.e., lime, illite ilerite, ground phosphate rock, chitin, and corn straw charcoal) for adsorption capacity of heavy metals (i.e., Zn, Pb, and Cd).

Results and discussion

The adsorption efficiency of lime for Zn and Cd was 99.64% and 99.99% followed by chitin with adsorption efficiency of 74.94% and 81.63% respectively. The adsorption efficiency of amendments for Pb, Zn, and Cd was increased gradually with adsorption time. The adsorption efficiency has gradually reached a stable stage after certain time. In addition to adsorption of Pb by corn straw charcoal, the other four materials (i.e., lime, illite ilerite, ground phosphate rock, and chitin) have reached equilibrium when pH value was 3. The adsorption efficiency of lime (1%) for Zn was highest (99.98%). The adsorption efficiency of other materials for Pb was enhanced with increase in dosage except for chitin; however, the unit adsorption capacity was not decreased.

Conclusions

It is concluded that adsorption efficiency of lime and chitin for heavy metals such as Zn, Pb, and Cd was more than illite ilerite, ground phosphate rock, and corn straw charcoal, which can be considered as an active sorption materials.

中文翻译：

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不同改性剂对重金属（铅，锌和镉）的吸附特性的影响

目的

不同的修正对重金属的吸附能力各不相同。这项研究的目的是评估不同种类的重金属改性剂的吸附效率，并为减轻重金属提供理论指导。

材料和方法

进行室内振荡实验以研究五种改性剂（即石灰，伊利石伊利石，磨碎的磷酸盐岩，甲壳质和玉米秸秆木炭）对重金属（锌，铅，镉和镉）的吸附效率。。

结果和讨论

石灰对Zn和Cd的吸附效率为99.64％和99.99％，其次为几丁质，吸附效率分别为74.94％和81.63％。Pb，Zn和Cd改性剂的吸附效率随吸附时间的增加而逐渐增加。一段时间后，吸附效率逐渐达到稳定阶段。pH值为3时，除玉米秸秆木炭吸附Pb外，其他四种材料（石灰，伊利石ilerite，磨碎的磷矿石和几丁质）也达到平衡。石灰的吸附效率锌（1％）最高（99.98％）。除甲壳素外，其他材料对铅的吸附效率随剂量的增加而增强; 但是，单位吸附容量没有降低。

结论

可以得出结论，石灰和几丁质对锌，铅和镉等重金属的吸附效率高于伊利石，钙磷矿和玉米秸秆木炭，可以认为是活性吸附材料。