齐齐哈尔碾子山麦饭石物化性能及其对Pb2+、Cd2+、Cr3+的吸附行为研究

以齐齐哈尔碾子山麦饭石为研究对象,通过比表面积及孔隙分析、阳离子交换容量(CEC)测试以及p H值缓冲能力测试等,对碾子山区麦饭石的结构和性能进行表征,并进一步研究麦饭石对Pb~(2+)、Cd~(2+)、Cr~(3+)的吸附行为。结果显示:碾子山区麦饭石具有海绵体大孔结构,阳离子交换容量(CEC)13~20 mmol/100 g。碾子山麦饭石对酸碱溶液都具有较好的调节能力,尤其对酸液的调节更高效。重金属吸附性能方面,对Pb~(2+)、Cd~(2+)、Cr~(3+)这3种离子吸附关系为:Pb~(2+)Cr~(3+)Cd~(2+)。

Physicochemical properties and adsorption performances of Nianzishan Maifan Stone in Qiqihar for heavy metal ions

Nianzishan District of Qiqihaer City was awarded the title of "Hometown of Chinese Maifan Stone" by the Committee of Chinese Hometown of Specialty in 2001. In this paper, the specific surface and pore properties, cationic exchange capacity(CEC) and pH buffering capacity of the Nianzishan Maifan Stone were tested and analyzed to reveal the basic structural and functional performances of Maifan stone; in this way, the adsorption performances of Nianzishan Maifan Stone for Pb²⁺, Cd²⁺ and Cr³⁺ can be explored respectively. It is indicated that Nianzishan Maifan Stone shows a cationic exchange capacity(CEC) of 13~20 mmol/100 g, with the sponge macro-porous structure. The pH values of acid and alkali solutions can be adjusted to a neutral point efficiently when the Nianzishan Maifan stone is added, especially for the acid solutions. The heavy metal adsorption performances of Nianzishan Maifan Stone are Pb²⁺ > Cr³⁺ > Cd²⁺.