现代城市商业步行街的人性化设计与植物配置

对现代城市商业步行街的主要特征、商业步行街植物造景的功能以及当前商业步行街植物造景设计存在的问题进行了分析,提出了商业步行街人性化的植物配置和造景建议。     

甲醛改性花生壳对亚甲基蓝的吸附特性研究

［目的］为花生壳在染料工业废水处理中的应用提供理论指导。［方法］通过甲醛改性花生壳对亚甲基蓝的吸附试验,探讨振荡时间、初始浓度、pH值、温度等因素对吸附过程的影响。［结果］15 min内,甲醛改性花生壳对亚甲基蓝的吸附量随时间的延长而快速增加15 min后,吸附量随时间变化增加缓慢。35～55 min内,改性花生壳对亚甲基蓝的吸附量变化较小,55～75 min变化较大,95 min后,基本不再改变。pH值为1～3时,改性花生壳对亚甲基蓝的吸附量随pH值的增加而减小,pH值为3～5时吸附量达到最小值 pH值为5～8时,吸附量增加,pH值大于8时,其吸附量又减小。改性花生壳对亚甲基蓝的吸附过程符合Langmuir与Freundlich模型,其吸附平衡常数与最大吸附量随温度的升高而增大。［结论］该吸附过程为自发的吸热过程且符合二级动力学反应。     

膨润土吸附结晶紫的动力学与热力学研究

利用天然钠基膨润土,以一定浓度的结晶紫水溶液为摸拟染料废水,探讨了不同参数如接触时间、初始pH值、温度等对其吸附性能的影响,结果表明:用300目的钠基膨润土,用40 mL初始浓度250 mg/L,pH 7的结晶紫溶液,在303 K振荡35 min,其吸附量达219.75 mg/g,且吸附量随温度的升高而增大.通过计算不同温度下的热力学参数△G0,△H0和△S0,证实该吸附为一自发的吸热过程.对实验数据进行拟合,得出等温吸附平衡更符合Langmuir模型,吸附动力学更适合准二级反应方程.

Abstract：

Na-bentonite was used as an adsorbent to adsorb crystal violet from aqueous solution, which served as simulated dye waste water, to study the influence of contact time, initial pH and temperature on its adsorption capacity. An adsorption capacity of 219.75 mg/g was achieved when 40 mL crystal violet with an initial concentration of 250 mg/L and a Ph of 7 was oscillated at 303 K for 35 min, and adsorption capacity increased with temperature. Calculation of the thermodynamic parameters △G0 ,△H0 and △S0 under different temperatures showed that the adsorption was a spontaneous, endothermic process. The experimental data indicated that the adsorption followed Langmuir isotherm model while the adsorption kinetics fit the pseudo-second-order reaction model.