CAJ | 학술논문

分别采用酸、碱、巯基乙酸3种化学方法对泡桐树叶粉末进行改性，利用扫描电镜（SEM）和傅立叶变换红外光谱（FTIR）对泡桐树叶吸附剂结构特性进行表征，研究了其对水中Pb2+和Cd2+的吸附行为。结果表明：吸附剂用量为3 g·L-1，温度25℃，溶液pH为5时，3种改性方法制得的泡桐树叶吸附剂4 h内都能达到吸附平衡，吸附过程可以用准二级吸附动力学模型描述。NaOH-乙醇改性的泡桐树叶（MPPA No.1）较未改性的泡桐树叶（UMPPA）对Pb2+和Cd2+的吸附能力得到明显提高，Pb2+、Cd2+平衡吸附量分别为15.38 mg·g-1和14.71 mg·g-1，对Cd2+的吸附速率较Pb2+快。UMPPA表面平展光滑，改性MPPA No.1表面粗糙呈蜂窝状，MPPA No.1比表面积为3.124 m2·g-1，较UMPPA增大150％。泡桐树叶主要含有羟基、羧基、酰胺等活性基团，有利于对Pb2+和Cd2+的吸附，经NaOH-乙醇改性的泡桐树叶对水中Pb2+和Cd2+有更好的吸附性能。
분별채용산、감、구기을산3충화학방법대포동수협분말진행개성，이용소묘전경（SEM）화부립협변환홍외광보（FTIR）대포동수협흡부제결구특성진행표정，연구료기대수중Pb2+화Cd2+적흡부행위。결과표명：흡부제용량위3 g·L-1，온도25℃，용액pH위5시，3충개성방법제득적포동수협흡부제4 h내도능체도흡부평형，흡부과정가이용준이급흡부동역학모형묘술。NaOH-을순개성적포동수협（MPPA No.1）교미개성적포동수협（UMPPA）대Pb2+화Cd2+적흡부능력득도명현제고，Pb2+、Cd2+평형흡부량분별위15.38 mg·g-1화14.71 mg·g-1，대Cd2+적흡부속솔교Pb2+쾌。UMPPA표면평전광활，개성MPPA No.1표면조조정봉와상，MPPA No.1비표면적위3.124 m2·g-1，교UMPPA증대150％。포동수협주요함유간기、최기、선알등활성기단，유리우대Pb2+화Cd2+적흡부，경NaOH-을순개성적포동수협대수중Pb2+화Cd2+유경호적흡부성능。
Tree leaves are waste litter and can be used as an adsorbent to remove heavy metals from water. In this study, paulownia leaf powder was modified with three chemicals, sulfuric acid, sodium hydroxide and thioglycolic acid, and was then examined its adsorption of Pb2+and Cd2+from aqueous solution. The surface and structure of modified paulownia leaf powder were characterized using Fourier transform infrared spectroscopy(FTIR)and scanning electron microscope(SEM). Adsorption of Pb2+and Cd2+by three modified paulownia leaf pow-der was fast and reached an equilibrium within 4 h. At pH5, temperature of 25℃and adsorbent dose of 3 g·L-1 in solution, adsorption ki-netics of Pb2+ and Cd2+ could be expressed by pseudo-second-order kinetics model. Compared with unmodified paulownia leaf powder (UMPPA), adsorption ability of NaOH-ethanol modified paulownia leaf powder(MPPA No.1)was improved significantly, and the equilibri-um adsorption capacity of Pb2+and Cd2+was 15.38 mg·g-1 and 14.71 mg·g-1, respectively. In addition, the adsorption speed was faster for Cd2+than for Pb2+. UMPPA revealed flat and smooth surface, while MPPA No.1 exhibited rough and honeycomb-patterned surface. The spe-cific surface area of MPPA No.1 was 3.124 m2·g-1, 50%greater than that of UMPPA. Paulownia leaves contain active functional groups such as hydroxyl, carboxyl and amides, facilitating adsorption of Pb2+and Cd2+. In conclusion, NaOH-ethanol modified paulownia leaves exhibited excellent adsorption for Pb2+and Cd2+in wastewater.