Adsorption performance of aluminum-based adsorbent towards Li+in shale gas produced water
Effective recovery of lithium(Li+)resources from shale gas produced water(SGW)may achieve the goals of saving costs and increasing benefits.In this study,an aluminum-based adsorbent powders and particulates were prepared by chemical deposition method and precipitation method,respectively.The adsorption behaviors of the adsorption material to Li+in SGW were investigated,and the effects of dissolved organic substances in SGW on the adsorption behaviors of the adsorption material were analyzed.The results showed that the saturated adsorption capacity of the adsorbent powder reached 7.0 mg·g-1,and the saturated adsorption capacity of the adsorbent particulate was 3.8 mg·g-1,and its adsorption kinetics conformed to the quasi-primary adsorption kinetic model.It also had the adsorption capacity for SGW with different water qualities.However,the saturated adsorption capacity of the adsorbent particulate in the simulated SGW without dissolved organic matter was 5.0 mg·g-1.In the fixed-bed flow adsorption experiments,the adsorbent particulate was able to recover 93.5％of the Li+in the SGW;however,but the Li+concentration in the desorbed solution of the simulated shale gas wastewater group was 96.2 mg·L-1,which was higher than that of the actual SGW group(58.8 mg·L-1).Therefore,the organic matter in the shale gas wastewater can severely inhibit the adsorption and desorption behaviors of the aluminum-based adsorbent.
shale gas produced wateraluminum-based adsorbentadsorption capacityorganicLi+adsorption
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