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对双硫腺分光光度法测定Cd时,水样处理方法进行了探讨,针对某些污染严重的水样,采用浓硝酸-过氧化氢前处理水样,并在有Na3PO4存在的情况下,于600℃的高温炉中灰化,结果令人满意。 相似文献
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Three-dimensional detonation cellular structures in rectangular ducts using an improved CESE scheme 下载免费PDF全文
The three-dimensional premixed H_2-O_2 detonation propagation in rectangular ducts is simulated using an in-house parallel detonation code based on the second-order space-time conservation element and solution element(CE/SE) scheme.The simulation reproduces three typical cellular structures by setting appropriate cross-sectional size and initial perturbation in square tubes.As the cross-sectional size decreases,critical cellular structures transforming the rectangular or diagonal mode into the spinning mode are obtained and discussed in the perspective of phase variation as well as decreasing of triple point lines.Furthermore,multiple cellular structures are observed through examples with typical aspect ratios.Utilizing the visualization of detailed three-dimensional structures,their formation mechanism is further analyzed. 相似文献
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采用热解法,以磷酸为活化剂,以葵花籽壳为碳源,制备了葵花籽壳活性炭,利用扫描电镜表征了其表面形貌,采用平衡吸附法研究了葵花籽壳活性炭对溶液中四环素的吸附性能和对养殖废水中四环素的去除能力。结果表明,在20°C时,葵花籽壳活性炭对四环素的最大吸附量为244.1 mg·g~(-1);吸附平衡时间为30 min;当pH值处于4-8时,pH值对葵花籽壳活性炭吸附四环素的容量没有显著性影响;葵花籽壳活性炭吸附四环素的容量随着温度的升高而增大,表明四环素吸附是一个吸热过程;利用葵花籽壳活性炭去除含有四环素的养殖废水时,四环素的去除率达到96.2%。等温吸附曲线符合Langmuir等温吸附模型;四环素的吸附动力学数据均符合准二级反应动力学模型。 相似文献
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