CAJ | 학술논문

镉污染对饮用水安全造成了严重的威胁。活性炭吸附是水处理中最重要的处理方法之一，但是对镉等重金属的吸附较弱，通过改性可以改变活性炭的表面特性，从而促进对重金属的吸附。该文对活性炭进行了混酸氧化改性，臭氧氧化改性和乙二胺氨基化的改性，零电荷点和表面官能团大大发生变化，混酸改性后的零电荷点最低。通过吸附动力学的研究发现混酸改性的活性炭（AC—O）对镉的吸附效果最好，且更加符合二级动力学的吸附模型。对AC O活性炭进行了不同pH下吸附热力学的研究，结果表明吸附等温线用Freundlich的热力学模型拟合比较好，并且pH越大越有利于镉的吸附，pH对AC O吸附镉效果的影响试验也表明，由于零电荷点的影响，在pH小于9的情况下，随着pH的升高静电吸引力越强。
력오염대음용수안전조성료엄중적위협。활성탄흡부시수처리중최중요적처리방법지일，단시대력등중금속적흡부교약，통과개성가이개변활성탄적표면특성，종이촉진대중금속적흡부。해문대활성탄진행료혼산양화개성，취양양화개성화을이알안기화적개성，령전하점화표면관능단대대발생변화，혼산개성후적령전하점최저。통과흡부동역학적연구발현혼산개성적활성탄（AC—O）대력적흡부효과최호，차경가부합이급동역학적흡부모형。대AC O활성탄진행료불동pH하흡부열역학적연구，결과표명흡부등온선용Freundlich적열역학모형의합비교호，병차pH월대월유리우력적흡부，pH대AC O흡부력효과적영향시험야표명，유우령전하점적영향，재pH소우9적정황하，수착pH적승고정전흡인력월강。
The pollution caused by cadmium is seriously threatening people's health. Adsorption by activated carbon is one of the most important ways in water treatment,but has little effect in heavy metal removal,which can be improved by modifying the surface characteristics. Modified granular activated carbon by oxidation of mixed acid,oxidation by ozone and amination by ethylenediamine were carried out,which had great changes in the activated carbon's surface functional groups and pHpzc. The activated carbon modified by mixed acid has the lowest pHpzc. The results of adsorption kinetics show that the modified activated carbon oxidized by mixed acid has the best removal efficiency of cadmium,which can be described by second-order kinetic equation better. The results of adsorption thermodynamics at different pH conditions indicates that the higher pH is,the better the adsorption effect of cadmium is,which can be described by Freundlich model better. The results of effects of pH on adsorption of cadmium by AC—O also indicates that when pH<9,the electrostatic attraction grows with the increase of pH.