Removal of guar and humus from water by layered double hydroxides

摘要

Natural organic matter such as guar and humus are recalcitrant to conventional pretreatmentntechnologies and can potentially foul processes such as membranes during water treatment.nAn innovative method of using synthetic layered double hydroxides (LDH) was investigated fornremoving common natural organic matter in the form of guar gum (GG) and humic acid (HA) fromnwater. Adsorption isotherms were evaluated with Langmuir and Freundlich models. Results shownthe affinity of GG and HA to LDH to be 11.31 and 9.33mgg21 LDH, respectively. Kinetic isothermsnindicate that the sorbing rates of LDH to GG and HA increase with initial GG and HAnconcentrations, fitting a pseudo-second order model. This study demonstrate that LDH may benan effective material in removing GG and HA from waters and offer an alternative to conventionalnpretreatment technologies for the mitigation fouling of membrane and other systems in waterntreatment.