CAJ | 학술논문

为了探究丁二酸改性对茶油树木屑吸附铀的促进作用，将茶油树木屑经过粉碎、筛分、碱化和酸化等前处理后，再利用丁二酸对茶油树木屑作改性处理.红外分析表明改性后木屑内部的化学基团中增加了羧基、酯基；扫描电镜可知，改性后的茶油树木屑由致密平直的条状结构变为疏松褶皱的叶片状结构，说明改性作用增加木屑内部的空隙.通过静态吸附实验，考察了吸附反应时间、木屑用量、 pH 值、温度、以及溶液初始浓度等因素对茶油树木屑改性前后吸附铀的影响；结果表明，茶油树木屑经丁二酸改性后对铀吸附效果明显提高，在12.5 mg?L -1的铀溶液中约提高了20％.改性和未改性的茶油树木屑对铀的吸附都在180 min 内达到平衡，并且都符合准二级动力学模型.改性和未改性茶油树木屑对铀的吸附等温线都符合Langmuir 和 Freundlich 模型.且由 Langmuir 等温方程计算可知，在35℃、 pH ＝4.0条件下，改性后的茶油树木屑对铀的最大吸附容量(Qm )由21.4133 mg?g -1提高到31.5457 mg?g -1.
위료탐구정이산개성대다유수목설흡부유적촉진작용，장다유수목설경과분쇄、사분、감화화산화등전처리후，재이용정이산대다유수목설작개성처리.홍외분석표명개성후목설내부적화학기단중증가료최기、지기；소묘전경가지，개성후적다유수목설유치밀평직적조상결구변위소송습추적협편상결구，설명개성작용증가목설내부적공극.통과정태흡부실험，고찰료흡부반응시간、목설용량、 pH 치、온도、이급용액초시농도등인소대다유수목설개성전후흡부유적영향；결과표명，다유수목설경정이산개성후대유흡부효과명현제고，재12.5 mg?L -1적유용액중약제고료20％.개성화미개성적다유수목설대유적흡부도재180 min 내체도평형，병차도부합준이급동역학모형.개성화미개성다유수목설대유적흡부등온선도부합Langmuir 화 Freundlich 모형.차유 Langmuir 등온방정계산가지，재35℃、 pH ＝4.0조건하，개성후적다유수목설대유적최대흡부용량(Qm )유21.4133 mg?g -1제고도31.5457 mg?g -1.
In order to explore how the modification of succinic acid improves the adsorption of tea oil tree sawdust for uranium, the tea oil tree sawdust was modified by succinic acid, after the pretreatments of crushing, screening, alkalization and acidification. Infrared analysis indicated carboxylic acid groups and ester groups were added to the sawdust after modification, and scanning electron microscope demonstrated after modification the appearance of tea oil tree sawdust was transferred from the structure like compact and straight stripped into the structure like loose and wrinkled leaves, which meant modification increased its inner pores. By the static experiments, effects of reaction time between adsorbent and solvent, dosage of adsorbent, temperature, pH value and initial concentration of uranium were investigated. The results showed that after the modification by succinic acid, the absorption rate of tea oil tree sawdust for uranium increased significantly by about 20% in 12. 5 mg?L - 1 initial concentration uranium solution. Adsorption equilibrium was achieved within 180 min, and the kinetic data can be well described by the pseudo-second-order kinetic model. The experimental adsorption isotherm followed the Langmuir and Freundlich models. In addition, the maximum adsorption amounts of tea oil tree sawdust after modification calculated from Langmuir equation raised from 21. 413 3 to 31. 545 7 mg?g - 1 at 35℃ and pH 4. 0.