Adsorption Characteristics Of TCC/TCS In Wastewater By Modified Materials

Triclocarban（TCC） and triclosan（TCS） as broad-spectrum and high-effect bactericide added to personal care products, which could cause the water security problems with them discharging into the water environment. In this paper, various modified adsorptions were studied and used to the experiment of adsorbing the TCC/TCS in water. The red brick, kaolin, zeolite, yellow earth and loess were modified by HNO3, NaOH and FeCl3, aiming to obserbe the effect of the adsorption capabilities of TCC/TCS before and after the modification. The good modified adsorptions were characterized by X-ray diffraction（XRD）, Brunauer–Emmett–Teller surface measurements（BET） and Scanning electron microscopy（SEM）. Functioned performances, mechanism and influence rules of the sorption of TCC/TCS onto modified adsorptinons were investigated by single-factor batch experiments, in addition the adsorption thermodynamics and regeneration performance was studied. Main factors of the adsorptionwere investigated by single-factor batch experiments, furthermore, the adsorption thermodynamics and regeneration performance were studied. Looking for a new kind of material with low price, abundant resources andwell adsorption capability for TCC/TCS in sewage, which provided theoretical foundation of application of modified materials technology for triclosan contaminant in wastewater. The main conclusions are drawn as follows:First, a method for the pretreatment and determination of triclocarban（TCC） in environmental water samples was developed. With the ENVI-18 as the SPE column and ethyl acetate/acetonitrile（1:1） as the eluent, by high performance liquid chromatography with HPLC-UV. The detection and quantitative limits of the instrument were 2.37 and 7.89 μg/L, respectively. Water enrichment ratio of 200 times, the method detection limit and the quantitative limit were 11.85 ng/L, 39.45 ng/L, respectively. The Sewage and surface water samples were spiked with 1¹0 μg/L TCC and the average recovery rates was 91.05%. The RSD only 5.09%. the detection method of high accuracy, can be used in sewage and surface water detection analysis of TCC.The removal rate of TCC, TCS were absorbed by RBP/N/Fe³⁺ could recched 81.82%, 57.14% respectively, the original RBP removal rate were only 37.77%, 33.37% respectively. The removal rate of TCC, TCS were absorbed by YE/N/Fe³⁺ could recched 76.29%, 55.88% respectively, the original YEremoval rate were only 35.17%, 37.39% respectively. The results of characterization techniques: XRD, BET, SEM showed that adsorption material surface was covered by iron component and did not change the crystal structure of the raw material. Incresaing amount of iron component and decreased the specific surface.The adsorption equilibrium of TCC on RBP/N/Fe³⁺ and YE/N/Fe³⁺ can be reached within 10 min, 60 min, the removal rate of RBP/N/Fe³⁺ and YE/N/Fe³⁺ could exceed 82.13%, 76.09%, respectively, the adsorption equilibrium of TCS on RBP/N/Fe³⁺ and YE/N/Fe³⁺ can be reached within 15 min, 30 min, the removal rate of RBP/N/Fe³⁺ and YE/N/Fe³⁺ could exceed 57.17%, 55.57%, respectively. The cave the best adsorption of TCC and TCS, when the pH is 7¹0 and 3, respectively.The removal percent of TCC and TCS onto RBP/N/Fe³⁺ and YE/N/Fe³⁺ reduced gradually as TCC and TCS initial concentrations increased from 5μg/L to 50μg/L.The optimum addition of RBP/N/Fe³⁺ and YE/N/Fe³⁺ about TCC and TCS 0.25g/L, 0.5g/L, 0.4g/L, 0.4g/L, respectively. In addition, the larger ionic strength and low temperature is advantageous to the RBP/N/Fe³⁺ and YE/N/Fe³⁺ adsorption removal of TCC and TCS.In the range of concentration（5⁵0μg/L） and temperature（25⁴5℃）, the sorption behavior of TCC and TCS onto RBP/N/Fe³⁺ and YE/N/Fe³⁺ can be well fitted by Freundlich isotherm（R2>0.966）. The adsorption process is spontaneous exothermic reaction. The absolute value of delta G decreases and the adsorption force decreases, when the temperature increase.