Water contamination caused by hazardous organic dyes has drawn considerable attention, among all of the techniques released, adsorption has been widely used, which however to a large degree is dependent on the develop...Water contamination caused by hazardous organic dyes has drawn considerable attention, among all of the techniques released, adsorption has been widely used, which however to a large degree is dependent on the development of high efficiency adsorbents. Waste biomass based porous carbon is becoming the new star class of adsorbents, and thus contribute more to the sustainable development of the society. In this work, for the first time to the best of our knowledge, abundant waste fallen Platanus orientalis leaves are employed as the raw material for hierarchical activated porous carbon(APC) microspheres via a mild hydrothermal carbonization(210 ℃,12.0 h) followed by one-step calcination(750 ℃, 1.0 h). The APC microspheres exhibit a specific surface area of 1355.53 m^2·g^-1 and abundant functional groups such as O—H and C=O. Furthermore, the APC microspheres are used as the adsorbents for removal of Rh B and MO, with the maximum adsorption capabilities of 557.06 mg·g^-1 and 327.49 mg·g^-1, respectively, higher than those of the most porous carbon originated from biomass. The adsorption rates rapidly approach to 98.2%(RhB) and 95.4%(MO) within 10 min. The adsorption data can be well fitted by Langmuir isotherm model and the pseudo-second-order kinetic model, meanwhile the intra-particle diffusion and Boyd models simultaneously indicate that the diffusion within the pores is the main rate-limiting step. Besides, the APC microspheres also demonstrate good recyclability, and may also be applied to other areas such as heterogeneous catalysis and energy storage.展开更多
Plants are capable of reducing environmental pollutions through uptaking contaminants in their tissues. In the study site, twenty one-year-old leaves and shoots as well as twenty soil samples were sampled and analyzed...Plants are capable of reducing environmental pollutions through uptaking contaminants in their tissues. In the study site, twenty one-year-old leaves and shoots as well as twenty soil samples were sampled and analyzed by Inductively Coupled Plasma （ICP）. We investigated the uptaking ability of lead （Pb） and cadmium （Cd） by the leaves and shoots of Platanus orientalis, Robinia pseudoacacia and Fraxinus rotundifolia in Karaj city, the western Tehran, Iran. We also evaluated the total metal accumulation capacity by using metal accumulation index （MAI）. Results indicated that there was no significant difference in uptaking contents of Cd and Pb in the leaves among the trees. However accumulation of Cd in shoots of F. rotundifolia and R. pseudoacacia was significantly higher than that of P. orientalis. The accumulation of Pb in shoots of R. pseudoacacia was significantly higher than the other species. The amount of Pb in the soil of the study area was significantly higher than Cd. Concentrations of Cd and Pb in leaves of the three species are in the ranges of 2.4 2.7 mg Kg-1 and 7.1 14.4 mg Kg-1 , respectively. R. pseudoacacia had the highest MAI value for leaves （2.21） and F. rotundifolia had the highest MAI value for shoots （2.4）.展开更多
Effects of different Indole-3-Buteric Acid （IBA） concentrations （0, 1 000, 1 500 and 2 500 ppm） and curing types （soft wood, semi hard and hard wood） of plane tree were investigated with Randomized Complete Bloc...Effects of different Indole-3-Buteric Acid （IBA） concentrations （0, 1 000, 1 500 and 2 500 ppm） and curing types （soft wood, semi hard and hard wood） of plane tree were investigated with Randomized Complete Block Design （RCBD） at the Agricultural research station, Charsadda. The maximum survival percentage, plant height （cm）, root length （era）, numbers of roots and root weight per cutting were significantly higher in hard wood cuttings. IBA concentration had no speculative effect on plane tree cuttings. Thus, hard wood cutting was the best choice for plan tree propagation.展开更多
The bryophytic vegetation associated with Platanus orientalis trees were studied and compared with other important tree species of Nainital. In total 27 mosses and liverworts belonging to 14 families with three morpho...The bryophytic vegetation associated with Platanus orientalis trees were studied and compared with other important tree species of Nainital. In total 27 mosses and liverworts belonging to 14 families with three morphological groups formed the principle component of Platanus orientalis tree bark. Based on IVI (Important Value Index), Regmatodon orthostegius together with Brachymenium capitulatum formed the pioneer community, while Herpetineuron toccoae formed the climax community on the Platanus orientalis stems. Comparison of the bryoflora of P. orientalis with other dominant trees of this locality indicated that 15 species were common, while 12 species viz., Didymodon vinealis (Brid.) R.H., Bryoerythrophyllum dentatum (Mitt.) Chen, Gemmabryum apiculatum (Schw?gr.), Ditrichum heteromallum (Hedw.) Britt., Entodon chloropus Ren. & Card., Cylindrothecium laetum (Griff.) Paris, Fabronia schensiana C. Muell., Lejeunea tuberculosa Stephani, Levierella neckeroides (Griff.), Regmatodon orthostegius Mont., Rhynchostegiella menadensis (Lac.) Bartr. and Stereophyllum fulvum (Harv.) Jaeg. were confined to the tree barks of P. orientalis.展开更多
对三球悬铃木(俗称法国梧桐)落叶酸碱预处理及其同步糖化发酵产氢工艺进行实验研究,利用修正的冈珀茨模型(Gompertz model)对产氢曲线加以拟合,以累积产氢量和产氢速率为考察指标,研究不同酸碱预处理方法(添加质量分数为2%、4%、6%、8%...对三球悬铃木(俗称法国梧桐)落叶酸碱预处理及其同步糖化发酵产氢工艺进行实验研究,利用修正的冈珀茨模型(Gompertz model)对产氢曲线加以拟合,以累积产氢量和产氢速率为考察指标,研究不同酸碱预处理方法(添加质量分数为2%、4%、6%、8%的H2SO4和Ca(OH)2)对三球悬铃木落叶光合生物产氢性能的影响规律,优化出最佳酸碱预处理工艺条件为:稀酸预处理后的落叶试样的产氢性能优于氢氧化钙预处理后的落叶试样,其中H2SO4质量分数为4%时处理效果最佳,发酵产气中的氢气最大体积分数达66.34%,累积产氢量为369 m L,最高产氢速率11.03 m L/h。稀酸处理液可以实现3次有效回收利用。展开更多
基金Supported by the National Natural Science Foundation of China(21276141)the State Key Laboratory of Chemical Engineering,China(SKL-Ch E-17A03).
文摘Water contamination caused by hazardous organic dyes has drawn considerable attention, among all of the techniques released, adsorption has been widely used, which however to a large degree is dependent on the development of high efficiency adsorbents. Waste biomass based porous carbon is becoming the new star class of adsorbents, and thus contribute more to the sustainable development of the society. In this work, for the first time to the best of our knowledge, abundant waste fallen Platanus orientalis leaves are employed as the raw material for hierarchical activated porous carbon(APC) microspheres via a mild hydrothermal carbonization(210 ℃,12.0 h) followed by one-step calcination(750 ℃, 1.0 h). The APC microspheres exhibit a specific surface area of 1355.53 m^2·g^-1 and abundant functional groups such as O—H and C=O. Furthermore, the APC microspheres are used as the adsorbents for removal of Rh B and MO, with the maximum adsorption capabilities of 557.06 mg·g^-1 and 327.49 mg·g^-1, respectively, higher than those of the most porous carbon originated from biomass. The adsorption rates rapidly approach to 98.2%(RhB) and 95.4%(MO) within 10 min. The adsorption data can be well fitted by Langmuir isotherm model and the pseudo-second-order kinetic model, meanwhile the intra-particle diffusion and Boyd models simultaneously indicate that the diffusion within the pores is the main rate-limiting step. Besides, the APC microspheres also demonstrate good recyclability, and may also be applied to other areas such as heterogeneous catalysis and energy storage.
基金The project was financially supported by parks organization of Karaj municipality
文摘Plants are capable of reducing environmental pollutions through uptaking contaminants in their tissues. In the study site, twenty one-year-old leaves and shoots as well as twenty soil samples were sampled and analyzed by Inductively Coupled Plasma （ICP）. We investigated the uptaking ability of lead （Pb） and cadmium （Cd） by the leaves and shoots of Platanus orientalis, Robinia pseudoacacia and Fraxinus rotundifolia in Karaj city, the western Tehran, Iran. We also evaluated the total metal accumulation capacity by using metal accumulation index （MAI）. Results indicated that there was no significant difference in uptaking contents of Cd and Pb in the leaves among the trees. However accumulation of Cd in shoots of F. rotundifolia and R. pseudoacacia was significantly higher than that of P. orientalis. The accumulation of Pb in shoots of R. pseudoacacia was significantly higher than the other species. The amount of Pb in the soil of the study area was significantly higher than Cd. Concentrations of Cd and Pb in leaves of the three species are in the ranges of 2.4 2.7 mg Kg-1 and 7.1 14.4 mg Kg-1 , respectively. R. pseudoacacia had the highest MAI value for leaves （2.21） and F. rotundifolia had the highest MAI value for shoots （2.4）.
文摘Effects of different Indole-3-Buteric Acid （IBA） concentrations （0, 1 000, 1 500 and 2 500 ppm） and curing types （soft wood, semi hard and hard wood） of plane tree were investigated with Randomized Complete Block Design （RCBD） at the Agricultural research station, Charsadda. The maximum survival percentage, plant height （cm）, root length （era）, numbers of roots and root weight per cutting were significantly higher in hard wood cuttings. IBA concentration had no speculative effect on plane tree cuttings. Thus, hard wood cutting was the best choice for plan tree propagation.
文摘The bryophytic vegetation associated with Platanus orientalis trees were studied and compared with other important tree species of Nainital. In total 27 mosses and liverworts belonging to 14 families with three morphological groups formed the principle component of Platanus orientalis tree bark. Based on IVI (Important Value Index), Regmatodon orthostegius together with Brachymenium capitulatum formed the pioneer community, while Herpetineuron toccoae formed the climax community on the Platanus orientalis stems. Comparison of the bryoflora of P. orientalis with other dominant trees of this locality indicated that 15 species were common, while 12 species viz., Didymodon vinealis (Brid.) R.H., Bryoerythrophyllum dentatum (Mitt.) Chen, Gemmabryum apiculatum (Schw?gr.), Ditrichum heteromallum (Hedw.) Britt., Entodon chloropus Ren. & Card., Cylindrothecium laetum (Griff.) Paris, Fabronia schensiana C. Muell., Lejeunea tuberculosa Stephani, Levierella neckeroides (Griff.), Regmatodon orthostegius Mont., Rhynchostegiella menadensis (Lac.) Bartr. and Stereophyllum fulvum (Harv.) Jaeg. were confined to the tree barks of P. orientalis.
文摘对三球悬铃木(俗称法国梧桐)落叶酸碱预处理及其同步糖化发酵产氢工艺进行实验研究,利用修正的冈珀茨模型(Gompertz model)对产氢曲线加以拟合,以累积产氢量和产氢速率为考察指标,研究不同酸碱预处理方法(添加质量分数为2%、4%、6%、8%的H2SO4和Ca(OH)2)对三球悬铃木落叶光合生物产氢性能的影响规律,优化出最佳酸碱预处理工艺条件为:稀酸预处理后的落叶试样的产氢性能优于氢氧化钙预处理后的落叶试样,其中H2SO4质量分数为4%时处理效果最佳,发酵产气中的氢气最大体积分数达66.34%,累积产氢量为369 m L,最高产氢速率11.03 m L/h。稀酸处理液可以实现3次有效回收利用。
