Cu And Mechanism Of Adsorption Properties Of Porous Film Of Sodium Alginate In Water U (â…¥), (â…¡) In

The discharge of U（Ⅵ）, Cu²⁺from industries into the environment has resultedin a great of harm for aquatic organisms and human, therefore, the technology foreffective removal of U（Ⅵ）, Cu²⁺from wastewater is urgently needed. Removal ofU（Ⅵ）, Cu²⁺from wastewater by adsorption has been investigated by manyresearchers. The main advantages of the adsorption are recovery of the heavy metals,less sludge volume produced, simplicity of design and the meeting of strict dischargespecification, and adsorbent is the key of adsorption. Owing to the faster rate of themetal ions to be removed can be brought to the external and internal binging sites inthe adsorptive membrane than that of adsorptive beads, investigating into theadsorptive membrance is becoming more and more attractive.Glutaraldehyde crosslinked humic acid-immobilized sodium alginate wasdeveloped as a novel porous composite membrane adsorbent （GA-HA/SA） for theremoval of uranium （Ⅵ） ions from uranium-contained wastewater. Thephysico-chemical properties of GA-HA/SA before and after adsorption wereinvestigated by FT-IR, SEM and EDX methods. To investigate the effects ofexperimental parameters on adsorption behavior, a batch of experiments wereperformed by changing solution pH, initial U （Ⅵ） ions concentration, contact timeand temperature. The experimental data fitted well with Langmuir andDubinin-Radushkevich （D-R） isotherm models. The adsorption process could bedescribed by pseudo-second-order kinetic model, and the relation coefficient wasmore than0.99. The adsorption rate is controlled mainly by intra-particle diffusion.Thermodynamic parameters such as Gibbs free energy change, enthalpy change andentropy change were calculated, and the results showed that the adsorption of U（Ⅵ）onto GA-HA/SA was feasible, spontaneous and endothermic in nature. FT-IR andmean free energy of adsorption for D-R isotherm showed that the adsorption of U （Ⅵ）ions onto GA-HA/SA involves an ion exchange process.Glutaraldehyde crosslinked hydroxyethyl cellulose-immobilized sodium alginatewas developed as a novel porous composite membrane adsorbent （GA-HEC/SA） for the removal of copper （Ⅱ） ions from copper-contained wastewater. To investigate theeffects of experimental parameters on adsorption behavior, a batch of experimentswere performed by changing solution pH, initial copper （Ⅱ） ions concentration andcontact time. The experimental data fitted well with Freundlich, Sips,Redlich-Peterson（R-P） and Khan isotherm models. The adsorption process could bedescribed by pseudo-second-order kinetic model, and the relation coefficient wasmore than0.999. The analysis of pH and mean free energy of adsorption for D-Risotherm showed that the adsorption of Cu （Ⅱ） ions onto GA-HEC/SA involves an ionexchange process.