Removal Of BPA, NP And TBBPA From Aqueous Solutions Using Bioadsorbents

Selecting biomass as bioadsorbent, such as peat, sawdust, peanut shell, rice husk, mangosteen shell, corn cob and bagasse, and those were modified. Study on the removal efficiency of bisphenol A (BPA), nonylphenol (NP) and tetrabromobisphenol A (TBBPA) in water on bioadsorbents and modified bioadsorbents.According to adsorption efficiency the efficient bioadsorbent was selected. When the dosage was 1 g/L, the removal efficiency of BPA, NP and TBBPA were 80.4%,89.2% and 87.9%, respectively on peat. Different modifiers were used to modified peat and wooden peat, such as hexadecyl trimethyl ammonium bromide (CTAB), cetylpyridinium bromide (HPB) and tetrabutylammonium bromide (TBAB). The result was shown that the removal rate of BPA, NP and TBBPA on CTAB modified peat was highest. When the dosage of CTAB modified peat was 0.4g/L, the removal rate were 80.2%,92.1%,95.8%, respectively. Effect of ionic strength and pH value in waste water on the adsorption of BPA, NP and TBBPA, indicating that the concentration of CaCl2 was 1 mol/L, the removal efficiency of BPA, NP and TBBPA on CTAB modified peat were improved 4.29%,3.08% and 2.88%. pH values varied between 6-8, the removal efficiency of BPA, NP and TBBPA on modified peat were changed fractionally. Langmuir model can not effectively explain the adsorption isotherms of BPA, NP and TBBPA on wooden meal, peat, bagasse and corncob. The error was high by Freundlich model to fitting the adsorption isotherm of BPA. Deviations ND were more than 10%, when Dubinin-Radushkevich was used to fit the adsorption isotherm of NP on peat and modified peat and BPA on modified peat. The ND was less than 1% when the Redlich-Peterson model was used to fit adsorption isotherms of BPA, NP and TBBPA on peat and modified peat. Thermodynamic results show that theâ–³G,â–³H andAS of reactions are all below zero, indicating that the reaction between sorbent (peat or modified peat) and adsorbate (BPA, NP or TBBPA) is radiative and entropy increasing, can spontaneously occur.