CAJ | 학술논문

制备了镉单独污染和镉-菲复合污染的模拟水样,研究了菲对湘江沉积物吸附模拟水样中镉的动力学和热力学特征的影响,并进一步研究了在不同水样pH和ρ(沉积物)下,菲存在与否及ρ(菲)对沉积物吸附镉的影响.结果表明,无论菲存在与否,湘江沉积物吸附镉的热力学数据均能够用Langmuir方程拟合,相关系数达到0.99以上,属单分子层吸附;动力学数据均可用拉格朗日二级动力学方程拟合,相关系数接近1;以化学吸附过程为主,且在湘江沉积物上的吸附均以快速吸附为主;但是菲的存在削弱了沉积物对镉的吸附能力,提高了镉的解吸率.在试验范围内随着水样pH逐渐增大,菲对沉积物吸附镉的影响越小;ρ(菲)越大,沉积物对镉的吸附量越小;菲对沉积物吸附镉的影响主要是由于菲与镉竞争沉积物颗粒矿物之间的孔隙以及甲醇化的菲分子与颗粒的结合掩蔽了颗粒物表面的部分极性基团两方面原因造成的.
제비료력단독오염화력-비복합오염적모의수양,연구료비대상강침적물흡부모의수양중력적동역학화열역학특정적영향,병진일보연구료재불동수양pH화ρ(침적물)하,비존재여부급ρ(비)대침적물흡부력적영향.결과표명,무론비존재여부,상강침적물흡부력적열역학수거균능구용Langmuir방정의합,상관계수체도0.99이상,속단분자층흡부;동역학수거균가용랍격랑일이급동역학방정의합,상관계수접근1;이화학흡부과정위주,차재상강침적물상적흡부균이쾌속흡부위주;단시비적존재삭약료침적물대력적흡부능력,제고료력적해흡솔.재시험범위내수착수양pH축점증대,비대침적물흡부력적영향월소;ρ(비)월대,침적물대력적흡부량월소;비대침적물흡부력적영향주요시유우비여력경쟁침적물과립광물지간적공극이급갑순화적비분자여과립적결합엄폐료과립물표면적부분겁성기단량방면원인조성적.
Two synthetic water samples, one contaminated by cadmium (Cd) and phenanthrene (phe), and the other contaminated by Cd, were prepared. The effects of phe on the dynamics and thermodynamics of adsorption of Cd on Xiangjiang River sediments in both water samples were investigated. The influences of pH, mass concentration of sediment and mass concentration of phe on the adsorption of Cd were also studied. The results showed that the Langmuir equation described the adsorption isotherms well, with a correlation coefficient up to more than 0.99, whether phe existed or not. The Lagrangian second-order dynamic equation described the adsorption dynamics well, with a correlation coefficient of about 1. This indicated that the adsorption of Cd on Xiangjiang River sediments was monolayer adsorption, and that the dominant mechanism was chemical adsorption in both water samples. Rapid adsorption played the main role in the adsorption of Cd on Xiangjiang River sediments. The adsorption capacity reduced and the desorption ratio increased when phe existed. The degree of the effect of phe on the adsorption of Cd on Xiangjiang River sediments decreased when pH increased. The adsorbance of Cd reduced with the increase of phe concentration. The effect of phe on the adsorption of Cd on Xiangjiang River sediments is due to two reasons: one is competition on the particulates surface between phe and Cd; the other is the particulates polar groups being reduced as a result of the combination of methanolized phe and sediment particulates.