硅胶负载壳聚糖/海藻酸钠(SiO_2-CTS/SA)脱除扇贝废弃物酶解液重金属的研究

Study on heavy metals removal from hydrolyzate of scallop processing waste by SiO_2-CTS/SA

研究了硅胶负载壳聚糖/海藻酸钠（SiO2-CTS/SA）对扇贝废弃物酶解液中重金属的脱除作用。以扇贝加工废弃物为原料,SiO2-CTS/SA为实验材料,对酶解液进行处理,利用原子吸收石墨炉法测定处理液中各种重金属的含量。结果显示：在投加量为5 g/L,p H为6,吸附时间2 h条件下,SiO2-CTS/SA对Cr、Cd、Pb的脱除率分别为92.5%、82.3%和84.6%;在10-50℃间,吸附热力学较好的符合Langmuir方程式;吸附动力学均符合Lagergren准二级动力学模型。动态过柱实验表明,在流动过柱状态下SiO2-CTS/SA对Cr、Cd、Pb的吸附量分别为0.678、0.523、0.457 mg/g,在流速1BV/h,流动过柱2 h时后,脱除率接近100%;通过定量过柱实验,SiO2-CTS/SA可完全脱除酶解液中Cr、Cd和Pb;蛋白质、氨基酸态氮保存率分别为90.86%和92.39%。硅胶负载壳聚糖/海藻酸钠（SiO2-CTS/SA）能有效脱除扇贝酶解液中重金属Cr、Cd、Pb。

The removal of heavy metals from scallop waste by silica- supported chitosan/alginate （ SiO2- CTS/SA） was studied. Scallop processing wastes were used as raw materials and SiO2- CTS/SA was utilized to be experimental materials to treat enzymatic hydrolysate.Atomic absorption spectrometry was used to measure heavy metal contents in the liquid.It was found that the removal rate of Cr, Cd, Pb was 92.5%,82.3% and 84.6% in the condition dosage of 5 g/L, pH 6 and adsorption time of 2 h. The adsorption thermodynamics was well in accordance with the Langmuir equation between 10 ℃ to 50 ℃.The adsorption isotherm was conformed to the Langmuir equation.The pattern of adsorption was single molecular adsorption,and the adsorption kinetic followed the pseudo-second-order dynamics.Flow velocity of 1Bv/h,time of 2 h,the adsorption amount of SiO2-CTS/SA to Cr,Cd,Pb was 0.678,0.523,0.457 mg/g, respectively. Heavy metals of enzymolysis liquid collected after column cannot be detected.The retention rate of protein and amino acid nitrogen attained 90.86% and 92.39%.SiO2-CTS/SA can remove Cr,Cd, Pb of scallops enzymolysis liquid effectively.