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241.
Tiancui Li Yaocheng Fan Deshou Cun Yanran Dai Wei Liang 《Frontiers of Environmental Science & Engineering》2020,14(2):26
242.
Alisa Salimova Jian e Zuo Fenglin Liu Yajiao Wang Sike Wang Konstantin Verichev 《Frontiers of Environmental Science & Engineering》2020,14(3):48
243.
接枝羧基淀粉对贵金属离子吸附性能研究 总被引:5,自引:0,他引:5
研究了接枝羧基淀粉(ISC)对贵金属离子Ag(Ⅰ),Pd(Ⅱ)、Pt(Ⅳ)的静态吸附性能和选择性及介质的PH对其吸附性能的影响,利用接枝羧基淀粉与Ag(Ⅰ)形成螯合物的红外光谱和X-射线光电子能谱数据(XPS)探讨了其吸附作用机理。 相似文献
244.
Haiguang Zhang Lei Du Jiajian Xing Gaoliang Wei Xie Quan 《Frontiers of Environmental Science & Engineering》2023,17(5):59
245.
用3种入侵植物的地上(O)和地下(U)凋落物浸提液(Le)对紫色土进行修饰,采用批处理法研究各Le修饰土样对金霉素(CTC)的等温吸附特征,分析pH值、离子强度和温度对CTC吸附的影响。结果表明:各Le修饰紫色土对CTC的吸附等温线最适用于Freundlich模型描述;当pH值为2,离子强度为0.1 mol/L和试验温度40 ℃时,一年蓬(Conyzaannumus)Le修饰紫色土对CTC的吸附效果最佳,最大吸附量为1.68 mmol/kg~7.94 mmol/kg;当Le修饰比例为100%时,OLe和ULe修饰紫色土对CTC的吸附量均达到最大,且OLe修饰紫色土对CTC的吸附效果相比ULe更佳。 相似文献
246.
Yaqian Shen Ke Zhu Dongdong He Jin Huang Hongmei He Lele Lei Wenjin Chen 《环境科学学报(英文版)》2022,34(1):351-366
Recently, metal-based carbon materials have been verified to be an effective persulfate activator, but secondary pollution caused by metal leaching is inevitable. Hence, a green metalfree 3D macroscopic N-doped porous carbon nanosheets(NPCN) was synthesized successfully. The obtained NPCN showed high adsorption capacity of tetracycline(TC) and excellent persulfate(PS) activation ability, especially when calcined at 700 °C(NPCN-700). The maximum adsorption capacity of NPCN-700 was 121.51 mg/g by ... 相似文献
247.
Abhishek Mandal 《Journal of environmental science and health. Part. B》2016,51(3):192-203
The aim of this study was to establish the bark of Eucalyptus tereticornis L. (EB) as a low cost bio-adsorbent for the removal of imidacloprid and atrazine from aqueous medium. The pseudo-first-order (PFO), pseudo-second-order (PSO), Elovich and intra-particle diffusion (IPD) models were used to describe the kinetic data and rate constants were evaluated. Adsorption data was analysed using ten 2-, 3- and 4-parameter models viz. Freundlich, Jovanovic, Langmuir, Temkin, Koble–Corrigan, Redlich–Peterson, Sips, Toth, Radke–Prausnitz, and Fritz-Schluender isotherms. Six error functions were used to compute the best fit single component isotherm parameters by nonlinear regression analysis. The results showed that the sorption of atrazine was better explained by PSO model, whereas the sorption of imidacloprid followed the PFO kinetic model. Isotherm model optimization analysis suggested that the Freundlich along with Koble–Corrigan, Toth and Fritz-Schluender were the best models to predict atrazine and imidacloprid adsorption onto EB. Error analysis suggested that minimization of chi-square (χ2) error function provided the best determination of optimum parameter sets for all the isotherms. 相似文献
248.
鄱阳湖作为中国最大的淡水湖,国际重要湿地,其生态环境保护与可持续发展意义重大。基于GIS技术,以鄱阳湖流域为研究区域,利用3个时期多源数据,首先运用土壤流失方程估算鄱阳湖流域土壤侵蚀量,计算土壤侵蚀模数,然后根据泥沙输移比估算水体的泥沙负荷,最后采用颗粒态氮磷营养盐迁移经验模型定量研究鄱阳湖流域非点源吸附态污染物N、P负荷的时空变化规律。结果显示:吸附态氮磷污染负荷在空间分布上呈现出四周高、中间低的特点,相对较高的区域位于流域中、上游,这主要由于该区域多为山地陡坡;相对略低的区域位于流域的下游地区,这主要因为该区域平原和丘陵交错分布,土壤侵蚀强度较低。时间变化上,全流域单位面积N、P吸附态污染物负荷大都呈现先增加后减少的趋势,同时减少的幅度较增加的幅度大。 相似文献
249.
This study investigated adsorption of fulvic acid (FA) by single-walled (SWCNT) and multi-walled carbon nanotubes (MWCNT) and activated carbon. Adsorption of FA depends greatly on the adsorbent surface area and solution pH. SWCNT has higher adsorption than MWCNT and activated carbon. Lower E4/E6 (absorbance at 465 nm to that at 665 nm) and higher E2/E3 (absorbance at 250 nm to that at 365 nm) ratios of the residual FA in solution after adsorption than that of original FA in low pH ranges suggest that aromatic rich FA fractions with polar moieties readily adsorb on the adsorbents. The apparent interaction mechanisms between FA and CNT surfaces include electrostatic, hydrophobic, π-π and hydrogen-bond interactions. FA adsorption was reduced greatly with increasing pH because of the increase of electrostatic repulsion and the decrease of hydrophobic and hydrogen-bond interactions. 相似文献
250.
Xie Shuibo Zhang Chun Zhou Xinghuo Yang Jing Zhang Xiaojian Wang Jingsong 《Journal of environmental radioactivity》2009
Hematite, a type of inorganic-sorptive medium, was used for the removal of U (VI) from aqueous solutions. Variables of the batch experiments including solution pH, contact time, initial concentration, temperature, calcium and magnesium ions were studied. The results indicated that the adsorption capacities are strongly affected by the solution pH, contact time and initial concentration. A higher pH favors higher U (VI) removal. The adsorption was also affected by temperature and calcium and magnesium ions, but the effect is very weak. The maximum adsorption capacity (qm) only increased from 3.36 mg g−1 to 3.54 mg g−1 when the temperature was increased from 293 K to 318 K. A two-stage kinetic behavior was observed in the adsorption of uranium (VI): very rapid initial adsorption in a few minutes, followed by a long period of slower uptake. It was found that an increase in temperature resulted in a higher uranium (VI) loading per unit weight of the sorbent. The adsorption of uranium by hematite had good efficiency, and the equilibrium time of adsorbing uranium (VI) was about 6 h. The isothermal data were fitted with both Langmuir and Freundlich equations, but the data fitted the former better than the latter. The pseudo-first-order kinetic model, pseudo-second-order kinetic model and intraparticle diffusion model were used to describe the kinetic data, but the pseudo-second-order kinetic model was the best. The thermodynamic parameter ΔG0 were calculated, the negative ΔG0 values of uranium (VI) at different temperatures confirmed the adsorption processes were spontaneous. 相似文献