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Phosphorus(P) is the key element of the growth of phytoplankton, and is also significant cause of water eutrophication. In this work, the magnetic Fe3O4(FE) microspheres were employed as the core material, the La compound was coated on the surface of the FE microspheres and the adsorbent obtained was denoted as La@Fe. The effects of preparation conditions including the dosage of NaOH, the preparation time, the ratio of FE and LaCl3(LC), and the stirring time were discussed. The optimized La@Fe has a good adsorption capacity (130–160 mg·g−1) and strong magnetic recovery capacity (43.4 emu/g). In the low concentration (1 mg·L−1), the optimized La@Fe still had an excellent performance. It can keep a good adsorption in a wide pH range (3−8). Except Na2CO3, common anions (NaHCO3, NaCl, NaNO3, Na2SO4, KF, KNO2) in the wastewater could not affect the adsorption capacity of La@Fe. After 7 regeneration, the adsorption capacity of La@Fe reduced by 25% indicating the excellent regeneration property of La@Fe. The La@Fe was analyzed by SEM, TEM, XRD, XPS, BET, and LPS, and the obtained results showed that the particles of La@Fe were spherical, the particle sizes were between 0.1 and 100μm. The main components at the surface of La@Fe was La-(OH), which adsorbed phosphate to form La-PO4. The specific surface area of La@Fe was small and the mesopores were main pore structure. In addition, the adsorption kinetics analysis indicated that the Elovich model worked well on modeling La@Fe adsorbing phosphate, so the adsorption was chemical adsorption with heterogeneous adsorbing surfaces. Adsorption isotherms experiments revealed that the increasing adsorption temperature would enhance the adsorption capacity of La@Fe. It could be obtained from the thermodynamic experiments that the adsorption process was endothermic and chemical adsorption. Therefore, La@Fe is an excellent phosphate adsorbent and has a good application prospect in the field of phosphorus recovery and adsorbent reuse.

AbstractIn this article, we reported a new method in which molybdenum heteropolyacid salt was selected to mix with lanthanum oxide and bentonite, respectively, and the dipping method was used to prepare the new composites of heteropolyacid salt–lanthanum oxide, heteropolyacid salt–bentonite, and heteropolyacid salt–lanthanum oxide–bentonite. We observed that the composites have a better removal effect for phosphorus by control of the ratio and calcination temperature. The effect of quantity, adsorption time, phosphorus wastewater concentration, and pH value of composites on phosphorus adsorption was studied. We also found that the removal rate of phosphorus by the composite of heteropolyacid salt–lanthanum oxides increases up to 99.1% under the condition of 1:1 mass ratio and 500°C of calcination temperature. IR and XRD studies suggest that molybdenum heteropolyacid salt has been loaded to lanthanum oxide carrier successfully and heteropolyacid salt keeps the original Keggin structure. Heteropolyacid salt–lanthanum oxide has a good adsorption effect on phosphorus under the condition of 0.15 g of the composite, 90 min of adsorption time, phosphorus concentration of 50 mg L−1, and pH value of 3. The adsorption of phosphorus corresponds with the Langmuir isotherm model and Lagergren first-order kinetics equation. Therefore, the composite has excellent absorption ability and was competent in removing phosphorus with a low concentration from aqueous solution. It could be a great potential adsorbent for the removal of phosphorus in lakes, rivers, and reservoirs.

In this article, we reported a new method in which molybdenum heteropolyacid salt was selected to mix with lanthanum oxide and bentonite, respectively, and the dipping method was used to prepare the new composites of heteropolyacid salt–lanthanum oxide, heteropolyacid salt–bentonite, and heteropolyacid salt–lanthanum oxide–bentonite. We observed that the composites have a better removal effect for phosphorus by control of the ratio and calcination temperature. The effect of quantity, adsorption time, phosphorus wastewater concentration, and pH value of composites on phosphorus adsorption was studied. We also found that the removal rate of phosphorus by the composite of heteropolyacid salt–lanthanum oxides increases up to 99.1% under the condition of 1:1 mass ratio and 500°C of calcination temperature. IR and XRD studies suggest that molybdenum heteropolyacid salt has been loaded to lanthanum oxide carrier successfully and heteropolyacid salt keeps the original Keggin structure. Heteropolyacid salt–lanthanum oxide has a good adsorption effect on phosphorus under the condition of 0.15g of the composite, 90 min of adsorption time, phosphorus concentration of 50 mg L−1, and pH value of 3. The adsorption of phosphorus corresponds with the Langmuir isotherm model and Lagergren first-order kinetics equation. Therefore, the composite has excellent absorption ability and was competent in removing phosphorus with a low concentration from aqueous solution. It could be a great potential adsorbent for the removal of phosphorus in lakes, rivers, and reservoirs.

To observe the effect of lit-moxa stimulating acupoint Guanyuan (CV 4) on lactic acid and super-oxide dismutase (SOD) in skeletal muscle after exercise exhaustion.

Superoxide dismutases (SODs) are ubiquitous metalloenzymes in aerobic organisms that play a crucial role in protecting organisms against ROS. Here, we report the molecular cloning and functional characterization of a novel alternatively spliced variant of the iron-superoxide dismutase gene, OsFe-SODb, from a rice panicle cDNA library. The alternative splicing event occurred in the fourth exon of the OsFe-SODgene, and led to the translation of two isoforms of different sizes. The 5′ flanking region of the OsFe-SODwas cloned and many cis-acting regulatory elements were found that are involved in light responsiveness, including a G-box and an I-box. RT-PCR analysis showed that the two alternative forms of OsFe-SODwere expressed in both the vegetative and reproductive tissues of Cpslo17. Moreover, accumulation of both isoforms was upregulated by light induction. In addition, the alternative splicing of OsFe-SODmRNA was sensitive to low temperature. High yield production of the two recombinant OsFe-SOD isoforms was achieved in Escherichia coli. SOD assays showed that C-terminal truncation in OsFe-SODb did not result in a loss of SOD enzyme activity.Superoxide dismutases (SODs) are ubiquitous metalloenzymes in aerobic organisms that play a crucial role in protecting organisms against ROS. Here, we report the molecular cloning and functional characterization of a novel alternatively spliced variant of the iron-superoxide dismutase gene, OsFe-SODb, from a rice panicle cDNA library. The alternative splicing event occurred in the fourth exon of the OsFe-SODgene, and led to the translation of two isoforms of different sizes. The 5′ flanking region of the OsFe-SODwas cloned and many cis-acting regulatory elements were found that are involved in light responsiveness, including a G-box and an I-box. RT-PCR analysis showed that the two alternative forms of OsFe-SODwere expressed in both the vegetative and reproductive tissues of Cpslo17. Moreover, accumulation of both isoforms was upregulated by light induction. In addition, the alternative splicing of OsFe-SODmRNA was sensitive to low temperature. High yield production of the two recombinant OsFe-SOD isoforms was achieved in Escherichia coli. SOD assays showed that C-terminal truncation in OsFe-SODb did not result in a loss of SOD enzyme activity.