Compare Study of a New Type Adsorbent and 2 Traditional Adsorbents on Their Efficiency for As (V) Adsorption
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Iron coated zeolite is made and its adsorption characteristics are compared with activated alumina and zero-valent iron to get further understand of the new adsorbent. The results show that iron coated zeolite removes As(V) in the similar with that by activated alumina with removal rate of 50% in first 5min's adsorption but slower after 60 mins' adsorption and faster than that by zero-valent iron during the whole adsorption process. Iron coated zeolite sorption fits Langmuir model the best. Capacities of activated alumina, iron coated zeolite and zero-valent iron for As(V) adsorption are 7.3mg/g, 3.9mg/g and 3.3 mg/g, respectively. XRD analysis shows that main components on the surface of the used iron coated zeolite in this paper is FeOOH. To improve the adsorption efficiency of iron coated zeolite, diameter of the zeolite should be decreased and iron should be coated more tightly on the zeolite.Keywords:
Zerovalent iron
Dilution
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수중의 Sr과 Cs 이온을 제거하기 위하여 폴리술폰(polysulfone, PS)을 이용한 제올라이트 고정화로서 PS-zeolite 비드를 제조하였다. PS-zeolite는 SEM, XRD, FT-IR, TGA를 이용하여 특성 및 구조를 분석하였다. PS-zeolite 비드를 제조하기 위한 최적조건은 PS 1.25 g과 제올라이트 A 2 g이었다. 용액 pH의 증가에 따라 PS-zeolite 비드에 의한 Sr과 Cs 이온의 제거효율은 증가하였지만, pH 4 이상에서 일정하게 되었다. 본 연구에서 제조된 PS-zeolite 비드는 Na+, K+, Mg2+ 및 CA₂+와 같은 공존이온이 존재하더라도 Sr과 Cs 이온에 대한 높은 선택도를 나타내었다. 또한, 흡착과정에서 PS-zeolite 비드로부터 제올라이트 입자가 탈리되지 않았으며, PS-zeolite 비드는 SEM 이미지 상에서 구조가 유지되었다. PS-zeolite 비드에 의한 Sr과 Cs의 제거 효율은 5회 흡착-탈착 실험을 반복하여도 90% 이상 유지되었다. 본 연구에서는 이 결과로서 PS-zeolite 비드가 Sr과 Cs 이온의 흡착제로서 적용가능하다 것을 확인할 수 있었다. 또한, PS-zeolite는 산업폐수처리를 위한 방사성 이온 제거용 흡착제로서도 적용이 가능할 것이다.
Polysulfone
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This paper presents the systematic studies of the sorption capacity of natural zeolite with respect to In3+ and Ga3+ cations in the model systems “natural zeolite–In3+–H2O” and “natural zeolite–In3+–Ga3+–H2O”, while varying a number of the main process factors. The patterns of sorption of In3+ and Ga3+ cations by the natural zeolite of the Shankanai deposit are revealed, depending on the zeolite vs. solution ratio, temperature, and time. It is shown that the sorption of In3+ cations by natural zeolite can be controlled by the process duration. The longer the process, the less the sorption by natural zeolite. It has been found that the sorption of In3+ cations in the “natural zeolite–In3+–Ga3+–H2O” model system depends on the amount of zeolite and temperature, and the sorption of Ga3+ cations depends on the temperature and time. The physicochemical characteristics of the spent sorbents confirm the sorption of the cations, present in the systems under study.
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In this paper,the container wall sorption percentage and the sorption ratio of Am betweensolution and such sorption materials as bentonite are studied with the HPGe detector connected-with S-85 multichannel system,the influence of container wall sorption on sorption ratio also isdiscussed.The results show that the container wall sorption with solid sorptive materials is lowerthan that without solid sorptive materials. The container wall sorption should be considered forthe sorptive materials with low sorption ratio values and can be neglected for those with highsorption ratio values.
Bentonite
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In this study, removal of MG (malachite green), a toxic dye, by ZVI (zerovalent iron) and ZVI/US (combining use of zerovalent iron and ultrasound) was comparatively studied. The result shows that MG could be removed by ZVI, and a combined use of ZVI and ultrasonic enhanced MG degradation. MG degradation by ZVI and ZVI/US treatment followed the first-order kinetic equation. The first-order rate constant for MG degradation by ZVI was enhanced by a factor of about 2 under ultrasonic irradiation, at initial pH ranging from 2 to 10. MG degradation percentage by ZVI increased significantly as the initial pH of solution increased from 2 to 4. For ZVI treatment, initial pH of the solution had little effect on MG degradation when it was above 4. For ZVI/US treatment, MG degradation percentage increased significantly with initial pH from 2 to 7, but increased slightly with initial pH from 7 to 10. MG degradation percentage increased as ZVI dosage increased both for ZVI treatment and ZVI/US treatment. MG de radation percentage by ZVI and ZVI/US treatment and the corresponding degradation rate decreased when initial MG concentration increased. An increase in ultrasonic power intensity from 0.5 to 2.0 W ml(-1) resulted in higher MG degradation percentage and rate, whereas a further increase in ultrasonic power intensity resulted in a decrease in MG degradation.
Zerovalent iron
Malachite green
Degradation
Sonochemistry
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國內産 天然 Zeolite를 利用하여 低廉한 重金屬吸着劑의 開發을 위해 이온 交換容量이 큰 Zeolite를 合成하고 이것의 重金屬 吸着能力을 調査하였다.
天然 Zeolite의 主 構成 粘土鑛物은 Clinoptilolite와 Mordenite였으나 合成 Zeolite는 Phillipsite였다.
試料에 依한 Cu와 Zn의 吸着反應은 1時間 以後에 吸着平衡에 到達하였다. 吸着量은 試料量 및 添加重金屬 이온들의 濃度가 增加할수록 增加하는 傾向이었으며 合成 Zeolite가 天然 Zeolite에 比해 高濃度에서 吸着率이 높았다.
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This paper introduces the nature of kaolin and synthesis of 4A zeolite,Y zeolite,X zeolite,P zeolite,ZSM-5 zeolite,SAPO-5 zeolite from kaolin.It also discusses some advanced methods of synthesizing zeolite from kaolin,for example,microwave synthesis,in-situ crystallization,non-water system and the mechanism of preparing zeolite.
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This study was conducted to investigate chemical reduction efficiency of nitrate by synthesis na noscale zero-valent iron (NZVI) in aqueous solution, under aerobic condition. TEM image shows synthesis nano zero-valent iron has a size in the range of 40–150nm. Experimental results suggest that the reduction efficiency of nitrate decreased quickly with increasing initial pH value from 4 to 10 increased considerably with the increasing dosage of nanoscale zero-valent iron from 0.25 to 1gl -1 and did not vary much with initial nitrate concentration changing from 30 to 50 mg l -1 ( NO 3 -N). With reductive denitrification of nitrate by nano zero-valent iron, the removal rate of nitrate reached 80% in 60 min with nano zero-valent dosage of 1.0gl −1 and pH in 4, in room temperature.
Zerovalent iron
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