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采用干压成型法和造孔剂结合将锆柱撑蒙脱土(Zr-MMT)成型为大孔吸附材料(P-ZMt),采用X射线衍射(XRD)、扫描电子显微镜(SEM)、热重分析仪(TG)和全自动压汞仪对P-ZMt进行表征,研究不同造孔剂配比、造孔剂量和压力对P-ZMt的孔隙率、渗透系数和比表面积的影响,并对P-ZMt吸附Cu~(2+)、Cr~(3+)、Pb~(2+)、Cr6+的效果进行探讨。结果表明:P-ZMt成型的最佳条件为m(聚甲基丙烯酸甲酯)∶m(偶氮二酰胺)=1∶2,w(造孔剂)=40%,压力为20 MPa,焙烧温度为550℃;P-ZMt孔径介于100~170μm,孔隙率达39.85%,大孔之间相互贯通,且孔壁呈现三维蜂窝状孔隙;当吸附剂投加量为1 g/L时,P-ZMt对Cr~(3+)、Cu~(2+)、Pb~(2+)去除率均大于90%,而对Cr6+几乎不吸附。
Zirconium pillared montmorillonite (Zr-MMT) was formed into a macroporous adsorption material (P-ZMt) by dry-pressure forming method and pore-forming agent. XRD, SEM, P-ZMt was characterized by TG, automatic mercury intrusion porosimetry and the effects of different pore-forming agent ratio, pore-forming dosage and pressure on the porosity, permeability coefficient and specific surface area of P-ZMt were studied. P-ZMt adsorption of Cu ~ (2 +), Cr ~ (3 +), Pb ~ (2 +), Cr6 + effect were discussed. The results showed that the optimal conditions of P-ZMt molding were m (polymethylmethacrylate): m (azodicarbonamide) = 1: 2, w (pore forming agent) = 40%, pressure 20 MPa, calcination Temperature is 550 ℃. P-ZMt has a pore size of 100-170μm and a porosity of 39.85%. The large pores are interpenetrated and the three-dimensional honeycomb pores are present in the pore walls. When the adsorbent dosage is 1 g / L, P-ZMt removal rates of Cr ~ (3 +), Cu ~ (2 +) and Pb ~ (2+) were more than 90%, while almost no adsorption to Cr6 +.