Hong Chang-hong, Huang Ben-sheng, Qiu Jing, Zhang Wei-ming
Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China.
Huan Jing Ke Xue. 2011 May;32(5):1388-93.
Desorption behaviors of loaded 4-nitrophenol (4-NP) on hyper-cross-linked polymer resin NDA-701 were studied. The molar ratio of NaOH and 4-NP desorbed (M(NAOH/4-NP)) selection experiments were carried out at two different reaction temperature(303 K and 333 K). Desorption kinetics characteristic of4-NP on NDA-701 in the batch and fixed-bed mode were examined at different reaction temperature and M(NaOH/4-NP) values. The results showed that optimal M(NaOH/4-NP) values were 1.2 and 100% 4-NP could be desorbed from NDA-701 at two different temperature. When the M(NaOH/4-NP) was lower than 1.2, the desorption efficiency increases with the increase of temperature, but the function of temperature decrease with increasing of M(NaH/4-NP) values for desorption ratio. The information indicated that desorption thermodynamic characteristic of NDA-701 was controlled by M(NaOH/4-NP) values. Desorption kinetics in the alkaline system can be well described by pseudo-second-order kinetic model, and desorption rate is increased with the increase of desorption temperatures, the k2 value increase from 0.010 g x (mmol x min)(-1) to 0.035 g x (mmol x min)(-1) when desorption temperature increase from 303 K to 333 K. Nevertheless, higher M(NaOH/4-NP) values could not promote desorption rate if only M(NaOH/4-NP) value was larger than the optimal molar ratio of NaOH and 4-NP. When M(NaOH/4-NP) values increase from 1.2 to 5.0, the k2 value increase from 0.038 g x (mmol x min)(-1) to 0.044 g x (mmol x min)(-1) merely at 333 K. the results indicated that desorption kinetic characteristic of NDA-701 was controlled by temperature. NDA-701 can be completely recovered using 2 times Bed Volume of 2% NaOH solution at the temperature of 333 K, comparing with field application, implying that more energy and cost can be saved in comparison with the actual desorption process in the industry.
研究了负载4-硝基苯酚（4-NP）在超交联聚合物树脂NDA-701上的解吸行为。在两个不同反应温度（303 K和333 K）下进行了NaOH与解吸的4-NP的摩尔比（M(NaOH/4-NP)）选择实验。在不同反应温度和M(NaOH/4-NP)值下，考察了4-NP在NDA-701上的间歇和固定床模式下的解吸动力学特征。结果表明，最佳M(NaOH/4-NP)值为1.2，在两个不同温度下100%的4-NP可从NDA-701上解吸。当M(NaOH/4-NP)低于1.2时，解吸效率随温度升高而增加，但温度对解吸率的作用随M(NaH/4-NP)值的增加而降低。该信息表明NDA-701的解吸热力学特征受M(NaOH/4-NP)值控制。碱性体系中的解吸动力学可用伪二级动力学模型很好地描述，解吸速率随解吸温度的升高而增加，当解吸温度从303 K升高到333 K时，k2值从0.010 g·(mmol·min)(-1)增加到0.035 g·(mmol·min)(-1)。然而，如果仅M(NaOH/4-NP)值大于NaOH与4-NP的最佳摩尔比，较高的M(NaOH/4-NP)值并不能促进解吸速率。当M(NaOH/4-NP)值从1.2增加到5.0时，仅在333 K下k2值从0.038 g·(mmol·min)(-l)增加到0.044 g·(mmol·min)(-1)。结果表明NDA-701的解吸动力学特征受温度控制。在333 K温度下，使用2倍床体积的2% NaOH溶液可使NDA-701完全再生，与实际应用相比，这意味着与工业中的实际解吸过程相比可节省更多的能量和成本。
