活性氧化铝固定床吸附除氟的模型化研究

建立了活性氧化铝固定床吸附除氟过程的数学模型,通过连续实验获得了Langmuir吸附容量qm以及Langmuir常数KL,运用最小二乘法拟合了吸附过程的总传质系数ks,并使用龙格-库塔法求得模型的数值解。为了验证模型的可靠性,将所建立模型的计算结果与实验结果进行比较,使用相对误差法进行分析。结果表明当空速小于6.0 h-1时,6组模拟与实验数据的相对误差均小于10%,模拟与实验所得穿透曲线吻合良好。所建立模型的准确性能够满足工程应用和设备设计的需要。     

改性活性氧化铝吸附除氟的连续试验研究

针对不同进水水质、运行条件、设备3个方面，对改性活性氧化铝吸附除氟连续试验进行研究。试验结果表明，进水氟质量浓度、进水pH对吸附柱穿透影响显著，进水氟质量浓度从5mg/L下降到2mg/L时，穿透体积提高1.9倍；进水pH从7.6降低到6.0时，穿透体积提高2.6倍以上，当进水pH在6.0~6.5时，穿透体积达到最大值1388倍体积。穿透体积随进水速率提高而下降，在空速1.3~2.0h^-1时，穿透体积下降较小；当空速大于2.0h^-1时，穿透体积随空速增加而快速下降。吸附柱直径及填充高度对穿透体积无影响。     

尼龙-6的合成工艺研究

以己内酰胺为原料,无机酸为催化剂,水为开环引发剂,己二酸为稳定剂,合成了聚己内酰胺（PA6）.探讨了不同聚合条件对尼龙-6聚合转化率的影响,及不同聚合条件对尼龙-6的软化温度的影响,并对产物进行了产率测算、软化温度测试和红外表征.研究表明,在反应温度240℃、反应时间3.5 h、己内酰胺和浓磷酸质量比为100：2、己内酰胺和己二酸质量比为100：3的聚合条件下,己内酰胺转化率可高达92.0%,所合成的聚合物粘均分子量为6.9×104 g/mol.     

Export and remineralization of POM in the Southern Ocean and the South China Sea estimated from 210Po/210Pb disequilibria

Disequilibria between ^210Po and ^210Pb in the upper water and their potential applications as a proxy of particle export and remineralization were examined in the Southern Ocean （station IV3） and the South China Sea （NS44）. ^210po was deficit in surface waters but excessive relative to ^210Pb in subsurface waters. Good positive correlation between ^210Po and particulate organic carbon （POC） indicated deficits and excess of ^210Po resulted from particulate organic matter （POM） export and remJneralization respectively, which was also supported by the decreased δ^13C and increased δ^15N downwards as a result of particle remineralization. On the basis of ^210Po/^210Pb box-model, POC export flux out of the surface waters were 1.2 mmol C. m^-2. d^-1 and 2.3 mmol C. m^-2. d^-1 for station NS44 and IV3, respectively. In the subsurface waters, remineralization fluxes of ^210Po were 0.062 Bq. m^-2.d^-1 and 0.566 Bq.m^-2.d^-1 for station NS44 and IV3 along with the recycle efficiency of 52±26% and 119±52%, respectively. Remineralized fluxes of POM derived from ^210Po and exported POC were 0.6 mmol C.m^-2.d^-1 and 2.7 mmol C. m^-2. d^-1 for NS44 and IV3. This study suggested that ^210Po was a powerful tracer of particle export and remineralization.     

Export and remineralization of POM in the Southern Ocean and the South China Sea estimated from ~(210)Po/~(210)Pb disequilibria

Disequilibria between 210Po and 210Pb in the upper water and their potential applications as a proxy of particle export and remineralization were examined in the Southern Ocean (station IV3) and the South China Sea (NS44). 210Po was deficit in surface waters but excessive relative to 210Pb in subsurface waters. Good positive correlation between 210Po and particulate organic carbon (POC) indicated deficits and excess of 210Po resulted from particulate organic matter (POM) export and remineralization respecti...