Adsorption Of Heavy Metal Ion From Marine Protein Hydrolysate Solution By Reconstructed Bamboo Lignocellulose

High efficient utilization of aquatic product process byproducts is an importantresearch topics in sustainable utilization of marine bioresources. Most of aquatic productprocess byproducts can be hydrolysised and prepared for physiological activity products.There are potential contamination of heavy metals in aquatic products because of oceanpollution and natural factors. Heavy metal ions pollution is the key factor that affects theusing of marine protein hydrolyzates. In this dissertation, a series of bioadsorbents(acid–alkali–treated bamboo, enzymatic hydrolysis bamboo, succinoylated bamboo) areprepared using bamboo lignocellulose for absorption Pb(II), Cd(Ⅱ) and Cu(Ⅱ) frommarine protein hydrolyzates solution,respectively. The microstructure of the lignocelluloseand the interaction between lignocellulose and metal ions are revealed by studyingfunctional groups and porous structure. The kinetics of the adsorption process isinvestigated. And the thermodynamic model is developed. The mechanism of adsorption isclarified. This dissertation provides an important technical supports for adsorption heavymetal ions from marine protein hydrolyzates solution and design of chemical processes.This work has important theoretical significances and practical prospects. The maincontents of this work are as following.(1) Effects of different controlling methods on the structure of the bamboo materialswere investigated. Scanning electron microscopy (SEM) and Fourier transform infraredspectroscopy (FTIR) were used to characterize the bioadsorbents. The effects of hydroxylgroup, carboxyl group, porous structure and specific surface area on the adsorptioncapacities were studied. The adsorption mechanism of the process was discussed.(2) The removal of Cu(Ⅱ) from marine protein hydrolyzate solution was investigatedusing acid–alkali–treated bamboo, enzymatic hydrolysis bamboo and succinoylatedbamboo as bioadsorbent. The effects of pH, temperature, contact time, adsorbent dosage,sodium chloride and amino acid concentrations on the adsorption capacities of thebioadsorbents were investigated. And the adsorption mechanism of Cu(Ⅱ) adsorption ontothe bioadsorbents were also investigated. The desorption experiment was studied to evaluate the reusing performance of the adsorbent.(3) The removal of Cd(Ⅱ) from marine protein hydrolyzate solution was investigatedusing enzymatic hydrolysis bamboo and succinoylated bamboo as bioadsorbent. The effectsof pH, temperature, contact time, adsorbent dosage, sodium chloride and amino acidconcentrations on the adsorption capacities of the bioadsorbents were investigated.Thermodynamic model, kinetics model and isotherm model were developed. And theadsorption mechanism of Cd(Ⅱ) adsorption onto the bioadsorbents was revealed.(4) The removal of Cd(Ⅱ) from marine protein hydrolyzate solution was investigatedusing enzymatic hydrolysis bamboo and succinoylated bamboo as bioadsorbents. Theadsorption behaviors of Cd(Ⅱ) on the adsorbents were investigated under differentexperimental conditions, such as pH, temperature, contact time, adsorbent dosage, sodiumchloride and amino acid concentrations. Thermodynamic model, kinetics model andisotherm model were developed. And the adsorption mechanism of Cd(Ⅱ) adsorption ontothe bioadsorbents was revealed.