Adsorption Of Some Heavy Metal Ions From Aqueous Solution By Modified Bentonite

Along with the progress of the industry, environment pollute has been more attention bypeople, expecially for heavy metal ions.How to recycle them became a new direction.Bentonite as a natural polymer adsorbent, which can be used as the adsorbent of heavy metals.This article attempted through two ways to modified bentonite, adsorption of heavy metalions were studied respectively.Firstly, Use ultrasonic wave to deal with natural bentonite, preparation of ultrasonicbentonite under different times.Every ultrasonic bentonites were characterised by FTIR, XRD.This experimental study is on the adsorption of heavy metal ions (Cu2+,Zn2+,Mn2+,Co2+), theresults show that ultrasonic bentonite is better than the bentonite. The results shown that whenthe concentration of heavy metal ions were50mg·L-1, the adsorbents were0.1g, two times,could remove them all.Secondly, Modified bentonite with physical method. Purity bentonite (montmorillonite95%~97%) modified with xanthate, hexadecyl trimethyl ammonium bromide(CTMAB),2-mercaptobenzothiazole(MBT) and ethylenediaminetetraacetic acid(EDTA), then four kindsof modified bentonites would be obtained, marked as Xan-BT, CT-BT, CT-MBT-BT andCT-ED-BT. All adsorbents were characterised by FTIR, XRD and TG.The results showed thathad made modified bentonite successfuly. These adsorbents were used as remove of Cu2+, theeffect of various factors on the adsorption was investigated, the results shown that theadsorption capacity is better than the unmodified bentonite, under the different initialconcentration of metal ion and different adsorption time, use the kinetic equation andadsorption isotherms fitting the adsorption. The results shown that every adsorption fitted theorder kinetic equation.