共查询到19条相似文献,搜索用时 62 毫秒
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《应用化工》2022,(3)
对硫酸铁热改性珍珠岩微粉的磷吸附特性进行了研究,发现溶液pH值对磷吸附有显著影响,pH值为5.0时吸附量(3.96 mg/g)最大,溶液磷去除率达98.68%;搅拌时间对磷的吸附影响较小,搅拌10 min与搅拌24 h的磷吸附量没有显著差异;在100 mg/L的磷溶液中,改性珍珠岩微粉用量在5.0~50.0 g/L范围内,其磷吸附量随用量的增加先快速增加,达最大值后缓慢降低;当模拟污水磷浓度为50 mg/L时,添加25 g/L改性微粉的磷去除率达99.3%,污水残磷浓度为0.35 mg/L,含磷量符合国家城镇污水处理厂污染物排放标准(GB 18918)的一级A类排放标准(≤0.5 mg/L)。硫酸铁热改性珍珠岩微粉在酸性、高磷废水的快速除磷处理中具有一定的应用潜力。 相似文献
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采用氯化铁溶液浸渍膨胀珍珠岩进行改性,考察了氯化铁质量分数、温度、时间等因素对改性效果的影响,改性膨胀岩的用量、温度、时间对磷吸附效果的影响,磷的含量采用磷钼蓝分光光度法进行浓度测定。试验结果表明:温度18℃时,1.500 0 g膨胀珍珠岩在20 mL质量分数1%的FeCl3溶液中改性7 h,对磷溶液吸附效果最优;温度18℃时,1.200 0 g改性膨胀珍珠岩加入到20 mL质量浓度3μg/m L的磷溶液中,吸附5 h后,去除率可达99.43%。用Langmuir方程描述了改性膨胀珍珠岩对磷的等温吸附特征,其吸附为单分子层吸附。动力学方程符合准二级吸附动力学模型。 相似文献
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将粉煤灰与碳酸钾混合后焙烧,再浸渍硝酸镧,制备出镧改性粉煤灰(La-FA)。通过多种手段对La-FA进行了表征,并研究了其对含磷废水的吸附性能。结果表明:La-FA表面形成许多孔隙,具有更多吸附位点和羟基官能团,硅和铝含量的增加。La-FA零点电位的pH值为5.8。当水中磷的质量浓度为30 mg/L、温度为20℃、pH为4.1时,投加2 g/L的La-FA且吸附时间为20 min时,磷去除率可达98%,吸附量为24.13 mg/g。La-FA对磷的吸附过程可分为三个阶段,符合Langmuir等温吸附模型和拟二级吸附动力学模型。吸附过程是自发进行的,且为吸热反应,吸附机理为离子交换。 相似文献
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Wyoming bentonite was calcined at 350–550° for 1, 3, and 12 h, dispersed in water and freeze-dried. Calcination at 350–450°C for 12 h decreased the specific surface area strongly. At higher calcination temperatures, the surface area became similar to the value of the uncalcined bentonite (24 m2/g). The micropore (diameter <2 nm) volume of the calcined samples was very small (<0.2 μl). In contrast, the mesopore (diameter 2–50 nm) volume increased sharply when the bentonite was calcined at >450°C. The total specific surface area mainly comprised the mesopore surface area. The Wyoming bentonite used in these experiments adsorbed considerable amounts of metolachlor from aqueous solutions, and the adsorption was enhanced by calcinating the bentonite. The metolachlor molecules, very likely, interact with aluminum ions or oligomeric hydroxoaluminum cations enriched on the edges of the silicate layers as a consequence of the thermal attack to the edges. A pronounced adsorption–desorption hysteresis is advantageous for using these bentonites in slow-release pesticide formulations. 相似文献
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Thermal stability of expanded perlite modified by mullite 总被引:1,自引:0,他引:1
Results of the thermal stability of expanded perlite modified by mullite are presented. Mullite was formed from alumino-silicate gel by sol–gel method. This method allowed us to obtain very homogenous and reactive gel and phase formation of mullite took place at relatively low temperatures. Expanded perlite modified with alumino-silicate gel after firing above the temperature of mullite formation had better thermal stability and durability during heating. The thermal stability of this material was examined up to 1400 °C. 相似文献
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空气-氧化剂联合氧化法制备聚合硫酸铁的研究 总被引:1,自引:0,他引:1
用废铁屑和H2SO4为原料,研究了空气—氧化剂联合氧化法制备聚合硫酸铁的工艺条件,如原料配比、反应温度、反应时间、溶液pH值等。结果表明,在[SO24-]∶[Fe]T=1.40~1.45∶1,反应温度为60℃,经6h的空气氧化后再用氧化剂继续氧化,可减少氧化剂用量80%,产品质量达到国家标准。 相似文献
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The layered material of sodium ferric silicate (SFS) has good adsorption properties for cationic dyes, but its stacking properties limit its application. The organic–inorganic composite assembled by macromolecular polymer and inorganic material can improve this situation. Carboxymethyl chitosan (CC) was loaded onto SFS, and the compound was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscope (TEM), Brunauer–Emmett–Teller (BET), zero energy thermonuclear assembly (Zeta), and Fourier transform infrared spectroscopy (FT-IR). The results showed that CC was successfully supported in the layered structure of SFS, and the adsorption capacity of the composite for methylene blue (MB) was 729.67 mg g−1. The adsorption process was described by pseudo second-order kinetics, Langmuir isothermal equation, and intraparticle diffusion. The adsorption process was endothermic and spontaneous, and the monomolecular adsorption was dominant. 相似文献
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