CAJ | 학술논문

用乙醇及氢氧化钠对蔗渣进行处理,得到改性蔗渣( MB)。通过扫描电镜、X射线衍射及傅里叶变换红外光谱对改性前后蔗渣进行了表征分析,通过静态吸附试验,研究了反应时间、反应温度、溶液的pH、Cd2+初始浓度、共存离子( Ca2+,Mg2+和Na+)对MB吸附Cd2+的影响。结果表明,改性蔗渣的比表面积增大,蔗渣原有的晶格结构被破坏,羟基的活性增强。 MB对Cd2+的吸附适宜pH为4.0~6.0；MB对Cd2+吸附平衡时间为20 min；MB对Cd2+的吸附过程的吸附等温线结果发现表明MB对Cd2+的吸附是化学吸附,MB对Cd2+的饱和吸附量为14.450 mg/g。 MB对Cd2+的吸附过程符合准二级动力学模型。热力学研究结果表明,MB对Cd2+的吸附过程是自发的放热过程。共存离子Ca2+,Mg2+和Na+对MB吸附Cd2+影响的顺序为Na+<Ca2+<Mg2+。
용을순급경양화납대자사진행처리,득도개성자사( MB)。통과소묘전경、X사선연사급부리협변환홍외광보대개성전후자사진행료표정분석,통과정태흡부시험,연구료반응시간、반응온도、용액적pH、Cd2+초시농도、공존리자( Ca2+,Mg2+화Na+)대MB흡부Cd2+적영향。결과표명,개성자사적비표면적증대,자사원유적정격결구피파배,간기적활성증강。 MB대Cd2+적흡부괄의pH위4.0~6.0；MB대Cd2+흡부평형시간위20 min；MB대Cd2+적흡부과정적흡부등온선결과발현표명MB대Cd2+적흡부시화학흡부,MB대Cd2+적포화흡부량위14.450 mg/g。 MB대Cd2+적흡부과정부합준이급동역학모형。열역학연구결과표명,MB대Cd2+적흡부과정시자발적방열과정。공존리자Ca2+,Mg2+화Na+대MB흡부Cd2+영향적순서위Na+<Ca2+<Mg2+。
In this study, bagasse was modified by ethanol and sodium hydroxide to produce adsor-bent ( MB). Then the surface morphology characterization of unmodified and modified bagasse get by used scanning electron microscope, infrared spectrometer and X-ray diffraction. The feasibility of u-sing MB for adsorption cadmium from aqueous solutions was investigated under different experimental conditions. The influence factor such as pH, reaction time, initial metal ions concentration and coex-istence cations( Ca2+,Mg2+,Na+) has been investigated for the adsorption of cadmium. The results showed that the specific surface area of modified sugarcane bagasse was increased. The lattice struc-ture of bagasse was destroyed after modified and the hydroxyl activity was increased. The optimum pH was ranged from 4 to 6 , the adsorption equilibrium time was 20 minutes. The result for simulation of isotherm show that the adsorption rate was controlled by chemical adsorption and the maximum ad-sorption capacities of Cd2+was 14. 450 mg/g. The adsorption kinetic data followed a pseudo-second <br> order model. The thermodynamic results show that the adsorption of cadmium ( II) by MB was spon-taneous and exothermic. The coexistence cations( Ca2+,Mg2+,Na+) affected the adsorption of Cd2+ in the follow oder :Na+< Ca2+< Mg2+.