The Study Of Antimony Removal In Raw Water With Modified Activated Carbon

Activated carbon that is the water treatment of the porous material is widely used and activated carbon which can remove mom-polar organics quickly and effectively is a non-polar adsorbent in an aqueous solution of non-polar organics. But antimony Sb(III) and other heavy metal ions are polar solute, so non-polar activated carbon is usually modified with a polarity to the surface to improve heavy metal ions antimony Sb(III) adsorption capacity. Previous studies showed that antimony is a heavy metal ion that is difficult to remove and most studies focused on antimony containing water to remove traces of antimony are rarely reported. Therefore, finding a cast-effective research has important significance in order to ensure drinking water safety in humans and other creatures.Activated carbon adsorption material as the core of the research on the adsorption of antimony raw Sb (III) removal is chosen for this subject research, including activated carbon modified experiment and static adsorption experiment. The concrete content includes the following:activated carbon,the modification methods and the choice of optimum modification conditions,by comparing the selected,an economic and efficient removal of the activated carbon with good effect as a best modified activated carbon modified activated carbon(0.1mol/L potassium permanganate solution); study of potassium modification of activated carbon in addition to influence factors of antimony Sb (III)(including adsorbent doing quantity, contact time, temperature, pH, interference ions(Cl-,NO3-,Ca2+, Mg2+); modified activated carbon static experiment simulated water samples in addition to adsorption properties of antimony Sb(Ⅲ) and to explore its removal mechanism, analyze its effectiveness and feasibility.The result of the experiment showed that using different concentrations of modifier of granular activated carbon through canning election microscope (SEM), XRD diffraction, infrared spectrometer (FTIR) to its pHysical and chemical properties of the modified were characterized. Activated carbon(maximum removal rate of95.88%) has the best adsorption effect through potassium permanganate modification, nitric acid modified(maximum removal rate of89.55%)times, in the case of adsorbent different dosing quantity clear modified activated carbon in the raw water Sb(III) adsorption removal efficiency is much higher than the unmodified activated carbon(maximum removal rate of62.04%).The result of the static adsorption experiment showed that modification of activated carbon adsorption of antimony Sb(III) removal efficiency is higher with the removal rate of95.88%and the corresponding adsorption capacity is31.96under the condition of pH value of3.1,potassium permanganate solution(0.1mol/L),initial concentration of Sb(III), adsorbent additive quantity of3.0g, the temperature of25℃.Found in the experiments, the effect of pH on adsorption is larger, the influence of only in the pH value of3.1or so to achieve the best effect of adsorption. In addition, the research on modified activated carbon adsorption isothermal process showed that the potassium permanganate process of modified activated carbon adsorption of antimony better accord with the Freundlich isothermal adsorption model, the correlation coefficient R2is0.9857; modified activated carbon in addition to the Sb(III) adsorption kinetics can better conform to the first order kinetics model, the correlation coefficient R2of0.9749.The experiment results show modified activated carbon for removal of trace antimony raw water Sb(III) has a good effect, with simple operation and efficient advantages. Therefore, the use of modified activated carbon to remove antimony raw water Sb(III),so as to meet "drinking water health standards"of the mass concentration limits antimony(5μg/L) is feasible.