In order to study the influences of functionalized groups onto the adsorption of tetracycline,we prepared a series of amino and amino-Fe3+ complex mesoporous silica adsorbents with diverse content of amino and Fe3+ groups (named N,N-SBA15 and Fe-N,N-SBA15).The resulting mesoporous silica adsorbents were fully characterized by X-ray powder diffraction (XRD),Fourier transform infrared spectrometer (FTIR) and N2 adsorption/desorption isotherms.Furthermore,the effects of functionalized groups on the removal of TC were investigated.The results showed that the periodic ordered structure of SBA-15 was maintained after modification of amino/Fe3+ groups.The functionalized amino groups decreased the adsorption capacity while the coordinated Fe3+ increased the adsorption capacity.The adsorption kinetics of TC fitted pseudo-second-order model well and the equilibrium was achieved quickly.The adsorption isotherms fitted the Lanuir model well and with the Fe3+ content increased from 3.93％ to 8.26％,the Qmax of the adsorbents increased from 102 to 188 mmol/kg.The solution pH affected the adsorption of TC onto amino complex adsorbents slightly while influenced the adsorption onto Fe-amine complex adsorbents greatly.The adsorption of TC on SBA15 and N,N-SBA15 may be related to the formation of outer-sphere surface complexes,while the adsorption of TC onto Fe-N,N-SBA15 was mainly attributed to the inner-sphere surface complexes.This study could offer potential materials that have excellent adsorption behavior for environmental remediation and suggested useful information for the preparing other adsorbents in environmental applications.