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CHEN Gang QING Chengsong CHEN Tianhu LI Xiaoxuan SONG Yinxian PENG Shuchuan 《《地质学报》英文版》2006,80(2):257-261
Decoloration of acidic scarlet GR by pyrolusite is studied in this paper. The effects of pH in solution, dosage and granularity of pyrolusite, reaction temperature, and vibration speed on decoloration efficiency are discussed. According to experiment results, the decoloration efficiency may exceed 95% for 40 mg/L GR solution by pyrolusite. pH is most important among all factors which impact the decoloration of acidic scarlet GR. Dosage and granularity of pyrolusite, reaction temperature, and vibration speed have a little benitfit on decoloration. The high decoloration efficiency and low removal efficiency of COD as well as FT-IR spectra of products between pyrolusite and acidic scarlet GR indicate that acidic scarlet GR undergoes the redox reaction on the interface of mineral and its chromophore is oxidated and decolored, but it is not removed thoroughly by oxidation. 相似文献
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Based on the principle of synthesis, a new method was put forward to dispose Congo Red anion-containing dyestuff from wastewater and its feasibility was also examined. The principle of the method is described as follows： Mg^2＋ and Al^3＋ are hydrolyzed to form Mg/Al-LDH by adding Mg^2＋, Al^3＋ and NaOH in wastewater containing anion dyestuff, which is selectively intercalated with the interlayer of LDH in order to balance positive structural charge. While Mg^2＋ and Al^3＋ are co-precipitated to form LDH, the anion dyestuff in wastewater will be removed by LDH synthesized in-situ, as is confirmed by X-ray diffraction analysis of settlings and chemical analysis of aqueous samples. In this work, we studied the influence of Mg/Al mole ratio, pH value, time and temperature of reaction on the removal of anion dyestuff and the use of Mg and Al. The experimental results showed the maximum removal efficiency of anion dyestuff could be attained when pH value was 9.0, and Mg/Al mol ratio was 2 ： 1, reaction duration was 2 hours, and the effect of temperature was not remarkable, and the removal efficiency could reach 100%. Meanwhile, the Mg and Al added could be made good use of. This technology has the advantage of extraordinary efficiency of wastewater disposal. 相似文献
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PENG Shuchuan L Lü WANG Jin HAN Lu CHEN Tianhu JIANG Shaotong School of Resources Environment Hefei University of Technology Hefei China 《中国地球化学学报》2009,28(2):184-187
A kinetic study was conducted on the adsorption of orthophosphate anions on layer double hydroxide (LDH). The adsorption has
proved itself to be a spontaneous endothermic process and is large in capacity and rate. The adsorption isotherm correlates
well with the Freundlich model, and a rise in temperature will lead to an increase in adsorption efficiency. Additionally,
the results suggested that the adsorption is an entropy-increasing process and is in good agreement with the pseudo-second
order kinetics. The free energy (ΔG) of adsorption of orthophosphate onto LDH varies within the range of −1.75–−3.34 kJ/mol,
the enthalpy (ΔH) varies by 7.96 kJ/mol and the entropy (ΔS) by 33.59 kJ/mol. The adsorption activation energy is 8.3 kJ/mol,
showing that the adsorption of orthophosphate onto LDH is determined to be a physical adsorption. 相似文献
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中日两国渔船动力装置性能的比较 总被引：1，自引：0，他引：1
本文在对中日两国渔船动力装置发展情况调查研究的基础上,对比了中日两国渔船主机的性能,分析了日本渔船主机的发展趋势以及中国渔船主机的现状,提出了中国渔船主机应该以提高强化指标、小型轻量,提高可靠性,降低燃油消耗率,发展系列化为主要发展方向。 相似文献
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Based on the principle of synthesis, a new method was put forward to dispose Congo Red anion-containing dyestuff from wastewater
and its feasibility was also examined. The principle of the method is described as follows: Mg2+ and Al3+ are hydrolyzed to form Mg/Al-LDH by adding Mg2+, Al3+ and NaOH in wastewater containing anion dyestuff, which is selectively intercalated with the interlayer of LDH in order to
balance positive structural charge. While Mg2+ and Al3+ are co-precipitated to form LDH, the anion dyestuff in wastewater will be removed by LDH synthesized in-situ, as is confirmed by X-ray diffraction analysis of settlings and chemical analysis of aqueous samples. In this work, we studied
the influence of Mg/Al mole ratio, pH value, time and temperature of reaction on the removal of anion dyestuff and the use
of Mg and Al. The experimental results showed the maximum removal efficiency of anion dyestuff could be attained when pH value
was 9.0, and Mg/Al mol ratio was 2: 1, reaction duration was 2 hours, and the effect of temperature was not remarkable, and
the removal efficiency could reach 100%. Meanwhile, the Mg and Al added could be made good use of. This technology has the
advantage of extraordinary efficiency of wastewater disposal.
Foundation item: Project supported by the National Natural Science Foundation of China (40472026). 相似文献
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CHEN Tianhu XU Huifang LU Anhuai XU Xiaochun PENG Shuchuan &YUE Shucang .College of Resources Environmental Engineering Hefei University of Technology Hefei China .Department of Geology Geophysics University of Wisconsin Madison WI USA .Department of Geology Peking University Beijing China Correspondence should be addressed to Chen Tianhu 《中国科学D辑(英文版)》2004,47(11):985-994
Palygorskiteusuallyisonlyaminorcomponentofmodernsedimentsandsoils.Onlyinspecificenvi-ronmentscanitoccurinlargeamountsandformeco-nomicaldeposits.Inspiteofitsscarcity,thismineralhasbeenrecordedinnumerousenvironments,rangingfromdeepseaandperitidalflatstosoilsandlacustrinesedimentaryrock[1—4].Palygorskiteinsedimentaryrocksandsoilscanbeofthreedifferentorigins:inherited,detritalandauthigenic[5].Theformationmechanismsofauthigenicpalygorskitearestillcontroversial,andvariousproc-esseshavebeenproposedf… 相似文献
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There were strong volcanic and hot spring activities in Late proterozic in the Xiqiu mining district,Zhejiang province,The volcanic rocks and hydrothermal sedimentary cherts have high contents of the major metallogenic elements,Their atomic percentage of Cu:Zn:Pb is similar very much between volcanic rock,hydrothermal sedimentary chert and ore.Therefore,the metallization has a direct bearing on the volcanic and hot spring activities in the Xiqiu area.The δ34S values vary from -6.5‰to 2.8‰,the δ30Si Values from-0.2‰ to 0.6‰,and the δ18O Values from 8.14‰ to 22.32‰,Lead isotopes were derived mainly from the lower crust.The ores have high contents of As,Sb,Bi,Ga,Zn,and Ba,and low Al/(Al Fe Mn)ratios,with Zn/(Zn Pb)ratios approximate to unity,Therefore,the Xiqiu massive copper sulfide deposit can be ascribed to volcano-hot spring deposition. 相似文献
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The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 mg/L, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 kJ/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of methylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and liquid-film diffusion. 相似文献