环境污染与防治
環境汙染與防治
배경오염여방치
ENVIRONMENTAL POLLUTION AND CONTROL
2010年
3期
75-78,84
,共5页
吸附剂浓度效应%蛭石%缓冲体系%非缓冲体系%Zn~(2+)%Cd~(2+)
吸附劑濃度效應%蛭石%緩遲體繫%非緩遲體繫%Zn~(2+)%Cd~(2+)
흡부제농도효응%질석%완충체계%비완충체계%Zn~(2+)%Cd~(2+)
adsorbent effect%vermiculite%buffer system%non-buffer system%Zn~(2+)%Cd~(2+)
探讨了蛭石分别在非缓冲体系与缓冲体系中的Zn~(2+)、Cd~(2+)吸附行为,比较了2个体系中Zn~(2+)、Cd~(2+)的平衡吸附量(q_e),q_e与平衡液相离子浓度(c_e),q_e与c_e和吸附剂浓度(W_0)之比(c_e/W_0)的对应关系.结果表明.在非缓冲体系与缓冲体系中,在3个W_0水平上,Zn~(2+)、Cd~(2+)都具有其独立的q_e-c_e等温吸附曲线,而q_e与c_e/W_0具有良好的相关性,在3个W_0水平上的q_e-c_e/W_0等温吸附曲线基本拟合在一起.即在q_e-c_e/W_0等温吸附曲线中均基奉消除了吸附剂浓度效应;加入缓冲溶液的传统方法并不能消除W_0对离子吸附效果的影响;缓冲体系中,大量的其他阳离子参与Zn~(2+)、Cd~(2+)的竞争吸附,从页使得Zn~(2+)、Cd_(2+)的q_e相对降低;缓冲体系的q_e-c_e、q_e-c_e/W_0等温吸附曲线与非缓冲体系相比,线性形式更为明显,缓冲体系的q_e-c_e/W_0等温吸附曲线中,q_e与c_e/W_0的对廊关系没有非缓冲体系中的好.
探討瞭蛭石分彆在非緩遲體繫與緩遲體繫中的Zn~(2+)、Cd~(2+)吸附行為,比較瞭2箇體繫中Zn~(2+)、Cd~(2+)的平衡吸附量(q_e),q_e與平衡液相離子濃度(c_e),q_e與c_e和吸附劑濃度(W_0)之比(c_e/W_0)的對應關繫.結果錶明.在非緩遲體繫與緩遲體繫中,在3箇W_0水平上,Zn~(2+)、Cd~(2+)都具有其獨立的q_e-c_e等溫吸附麯線,而q_e與c_e/W_0具有良好的相關性,在3箇W_0水平上的q_e-c_e/W_0等溫吸附麯線基本擬閤在一起.即在q_e-c_e/W_0等溫吸附麯線中均基奉消除瞭吸附劑濃度效應;加入緩遲溶液的傳統方法併不能消除W_0對離子吸附效果的影響;緩遲體繫中,大量的其他暘離子參與Zn~(2+)、Cd~(2+)的競爭吸附,從頁使得Zn~(2+)、Cd_(2+)的q_e相對降低;緩遲體繫的q_e-c_e、q_e-c_e/W_0等溫吸附麯線與非緩遲體繫相比,線性形式更為明顯,緩遲體繫的q_e-c_e/W_0等溫吸附麯線中,q_e與c_e/W_0的對廊關繫沒有非緩遲體繫中的好.
탐토료질석분별재비완충체계여완충체계중적Zn~(2+)、Cd~(2+)흡부행위,비교료2개체계중Zn~(2+)、Cd~(2+)적평형흡부량(q_e),q_e여평형액상리자농도(c_e),q_e여c_e화흡부제농도(W_0)지비(c_e/W_0)적대응관계.결과표명.재비완충체계여완충체계중,재3개W_0수평상,Zn~(2+)、Cd~(2+)도구유기독립적q_e-c_e등온흡부곡선,이q_e여c_e/W_0구유량호적상관성,재3개W_0수평상적q_e-c_e/W_0등온흡부곡선기본의합재일기.즉재q_e-c_e/W_0등온흡부곡선중균기봉소제료흡부제농도효응;가입완충용액적전통방법병불능소제W_0대리자흡부효과적영향;완충체계중,대량적기타양리자삼여Zn~(2+)、Cd~(2+)적경쟁흡부,종혈사득Zn~(2+)、Cd_(2+)적q_e상대강저;완충체계적q_e-c_e、q_e-c_e/W_0등온흡부곡선여비완충체계상비,선성형식경위명현,완충체계적q_e-c_e/W_0등온흡부곡선중,q_e여c_e/W_0적대랑관계몰유비완충체계중적호.
Experiments of Zn~(2+) and Cd~(2+) adsorptions by three concentration level of vermiculitein in buffer and non-buffer solutions were conducted to compare the adsorption behavior of Zn~(2+) and Cd~(2+) in two systems. Two types of adsorption isotherms were established by index of absorption quantity (q_e ), equilibrium concentration (c_e) and ratio of q_e to the concentration of adsorbent (W_0). The results showed that the adsorption of Zn~(2+) and Cd~(2+) at three level of W_0 had independent q_e-c_e adsorption isotherm both in buffer and in non-buffer solutions. The q_e was well correlated with c_e/W_0, and the q_e-c_e/W_0 adsorption isotherms obtained at three W_0 level coincided with each other. The absorption quantity of aim ions was relative low in buffer solutions for the competition of other cations; the q_e-c_e and q_e-c_e/W_0 adsorption isotherm in buffer solutions presented more obvious liner form than that in non-buffer solutions, while the correspondence of q_e and c_e/W_0 in non-buffer solutions was better than that in buffer solutions. The present findings suggest that the method of containing buffer solution to eliminate the adsorbent effect was not advisable.
