溶解性有机物对Cd吸附行为及影响因素的研究

Study on DOM Adsorption Behavior and Influencing Factors of Cd

摘要: 本文以作物秸秆中溶解性有机物(DOM)为吸附剂，Cd²⁺为吸附质，设置单一影响因素，研究DOM对Cd污染的吸附行为，找出最优吸附条件，并且在光谱层面上对DOM进行了紫外扫描，为后续利用该作物中DOM处理Cd污染的土壤提供科学依据。单因素试验结果表明：影响吸附的主要因素为DOM剂量与pH。DOM溶液添加的增多增加了土壤组分中的吸附位点，DOM溶液添加量为0.25 mL时，对Cd²⁺的吸附率为72.3%左右，在DOM溶液添加量达到2 mL的时候，吸附率达到最高点89.6%。pH在6~8之间时，DOM对Cd²⁺的吸附率能保持在高效稳定的状态。

Abstract: In this paper, the soluble organic matter (DOM) in crop straw is used as the adsorbent, Cd²⁺ is the adsorption, a single factor is set, the adsorption behavior of DOM on Cd pollution is studied, the optimal adsorption conditions are found, and the DOM is scanned for ultraviolet ism at the spectral level. It provides a scientific basis for the subsequent use of DOM in the crop to treat Cd²⁺. The results of the single-factor test showed that the main factors affecting adsorption were DOM dose and pH. The increase of DOM solution increased the adsorption site in the soil component, when the amount added by DOM solution was 0.25 mL, the adsorption rate of Cd²⁺ was about 72.3%, and the adsorption rate reached the highest point of 89.6% when the amount added by DOM solution reached 2 mL. When pH is between 6 and 8, the adsorption rate of Cd²⁺ can be maintained in an efficient and stable state.