【摘要】：以無機材料硅膠為基體,利用有機硅烷偶聯(lián)劑KH550、乙二醛和戊二醛為原料進(jìn)行希夫堿反應(yīng),分別合成含有C=N的硅膠鍵合醛基型吸附材料(乙二醛修飾的為SG-1、戊二醛修飾的為SG-2),并采用紅外光譜、熱重、掃描電子顯微鏡和孔結(jié)構(gòu)等分析手段對吸附材料進(jìn)行了表征。結(jié)果表明:(1)從微觀上看,硅膠表面較光滑;SG-1、SG-2表面的粗糙度、孔隙率都較硅膠明顯增加,有利于吸附實驗的進(jìn)行。(2)擬二級動力學(xué)方程更適合描述SG-1、SG-2對重金屬離子的吸附行為,吸附過程由化學(xué)吸附過程決定。SG-1、SG-2對4種重金屬離子的吸附熱力學(xué)過程適合用Langmuir等溫吸附方程解釋,其過程是單分子層吸附。(3)SG-1、SG-2對4種重金屬離子的靜態(tài)飽和吸附量均表現(xiàn)為Cu(Ⅱ)Ni(Ⅱ)Pb(Ⅱ)Cr(Ⅵ)。SG-1、SG-2對Cu(Ⅱ)靜態(tài)飽和吸附量分別達(dá)到9.401、9.738mg/g。(4)SG-1、SG-2對4種重金屬離子解吸率與解吸液(5%(質(zhì)量分?jǐn)?shù))硫脲+0.1mol/L鹽酸)體積并不呈現(xiàn)正相關(guān),解吸率基本可達(dá)到90%,再生性能良好,當(dāng)解吸液體積為6mL時解吸率最大。
[Abstract]:Silica gel bonded aldehydes containing C N were synthesized by Schiff base reaction using organic silane coupling agent KH550, Glyoxal and glutaraldehyde as raw materials, respectively (SG-1, modified by Glyoxal). Glutaraldehyde modified as SG-2) was characterized by IR, TG, SEM and pore structure. The results show that: (1) from the microscopic point of view, the surface of silica gel is smooth; The roughness and porosity of SG-1,SG-2 surface are obviously higher than that of silica gel, which is beneficial to the adsorption experiment. (2) the pseudo-second-order kinetic equation is more suitable to describe the adsorption behavior of heavy metal ions by SG-1,SG-2. The adsorption process is determined by the chemisorption process. SG-1, SG-2 adsorption thermodynamic process for four heavy metal ions is suitable to be explained by the Langmuir isotherm adsorption equation, and the adsorption process is monolayer adsorption. (3) SG-1,. The static saturated adsorption capacity of SG-2 to four heavy metal ions is Cu (鈪，

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