排序方式: 共有18条查询结果,搜索用时 31 毫秒
1.
2.
The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl2 chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM) ,Fourier transform infrared spectroscopy(FT-IR) ,and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2 ·g-1of BET surface,0.12 and 0.10 ml·g-1of microporous and mesoporous volume,respectively) .The oxygen functional groups such as OH,C O and C O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g-1at 12.58μg·m-3to 87.9μg·g-1at 72.50μg·m-3,and decreased as the adsorption temperature increased,from 246 μg·g-1 at 25°C to 61.3μg·g-1 at 140°C,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g-1and 53.8μg·g-1respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent. 相似文献
3.
4.
采用固相法合成系列铬钴复合氧化物催化剂,该催化体系在中低温[(180~300)℃]下具有优异的氨选择性催化氮氧化物还原活性,其中,Cr(0.5)-Cr Ox催化剂在空速50 000 h-1、反应温度200℃和220℃条件下,NOx转化率达100%。采用原位DRIFIS研究催化剂表面吸附物种以及催化机理,在反应温度220℃考察Cr(0.5)-Co Ox催化剂表面NH3与NO的吸附态形式和NH3-SCR反应过程中中间态及其反应机理。结果表明,Cr(0.5)-Cr Ox催化剂上NH3吸附在L酸位,也能吸附在B酸位,但只与气态的NOx反应,生成中间体NH2NO,再进一步反应,最终生成N2与H2O。吸附态的NOx不参与SCR反应,反应遵循Eley-Rideal机理。 相似文献
5.
6.
利用污水处理厂的脱水污泥,采用ZnCl2化学活化热解炭化法制备炭化污泥吸附剂。研究了炭化污泥吸附剂去除水溶液中Pb^2+的效果。通过正交试验确定最佳试验参数,试验结果表明,在炭化污泥吸附剂吸附时间为1h,溶液pH值为5.0,炭化污泥吸附剂用量为5g/L时,处理含Pb^2+的质量浓度为40mg/L的废水,Pb^2+的平均去除率为42.31%,炭化污泥吸附剂的平均吸附容量为2.94mg/g。实际应用中炭化污泥吸附剂可以用于处理低浓度含Pb^2+废水,当然为了达到较好的去除效果,炭化污泥吸附剂用量一般不能低于20g/L。 相似文献
7.
炭化污泥吸附剂对Pb~(2+)的吸附试验研究 总被引:3,自引:1,他引:2
利用污水处理厂的脱水污泥,采用ZnCl2化学活化热解炭化法制备炭化污泥吸附剂。研究了炭化污泥吸附剂去除水溶液中Pb2+的效果。通过正交试验确定最佳试验参数,试验结果表明,在炭化污泥吸附剂吸附时间为1h,溶液pH值为5.0,炭化污泥吸附剂用量为5g/L时,处理含Pb2+的质量浓度为40mg/L的废水,Pb2+的平均去除率为42.31%,炭化污泥吸附剂的平均吸附容量为2.94mg/g。实际应用中炭化污泥吸附剂可以用于处理低浓度含Pb2+废水,当然为了达到较好的去除效果,炭化污泥吸附剂用量一般不能低于20g/L。 相似文献
8.
9.
含芳香族化合物废气吸收液的氧化预处理 总被引:1,自引:1,他引:0
吸收法净化含芳香族污染物废气的吸收液具有COD浓度高,难生物降解的特点,采用Fenton试剂对模拟喷漆车间含二甲苯废气的吸收液进行氧化预处理,考察了H2O2和Fe2+浓度、pH、反应时间等因素对COD去除效果的影响。在H2O2投加量为0.39 mol/L,FeSO4.7H2O投量为16.32 mmol/L,pH为7.4,反应1 h的条件下,初始COD为12850 mg/L的废水的COD去除率可达到71.36%。结果表明,Fenton试剂对该废水可以取到很好的预处理作用。 相似文献
10.