共查询到17条相似文献,搜索用时 78 毫秒
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活性炭是应用范围最广的吸附剂,可以有效地吸附工业和医药等领域废水中的重金属离子和有机污染物等物质。但活性炭在吸附过程中易饱和,达到饱和状态的活性炭工作性能迅速下降,同时存在资源浪费以及二次污染的问题,使活性炭的产业化推广受到限制。本文针对饱和废弃活性炭的再生循环问题,梳理了目前饱和活性炭的各类再生技术方法的原理及特点,得出结论:要实现饱和废弃活性炭再生循环技术实现工业产业化推广,需综合考虑损失率、再生效率以及重复使用情况,但是由于现有的废活性炭再生循环方法均存在不同程度的技术短板,故活性炭再生循环技术并没有形成产业化规模从而大范围推广应用。建议将多种活性炭再生技术进行耦合以期达到固废利用的预期值,随着活性炭再生技术的不断研究和发展,终将突破瓶颈,逐步实现产业化推广。 相似文献
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分析了p H对颗粒活性炭(GAC)吸附苯酚性能的影响。实验选择质量分数为1%Na OH溶液,采用微波辅助溶液再生的方法,对吸附苯酚的GAC进行再生研究,探讨实验因素对GAC再生效率的影响。实验结果表明:最佳的再生条件为微波功率520 W、再生时间1.5 min、Na OH再生辅助溶液用量10 m L,此时GAC再生效率为95.6%。在最佳再生条件下,经过6次再生后GAC的吸附能力依然很强。 相似文献
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为了对有机物吸附饱和的活性炭纤维(ACF)进行电化学再生研究,以含油废水为模拟有机物,通过测量再生前后ACF对含油废水的吸附效果,考察了电流密度、再生时间、pH值、电解质的电化学再生的影响因素,并研究了电化学再生过程对ACF结构的影响以及ACF电化学再生的机理。结果表明,在电流密度为30 mA·cm-2,pH值为4,15 g·L-1 NaCl的溶液中再生120 min,再生率可达到90%,5次电化学再生循环后,ACF保持较高的吸附容量。再生后ACF的表面没有明显损伤,比表面积也没有明显减小,微孔孔径分布于0.5~1.0 nm。由紫外光谱分析可知,ACF的电化学再生机理主要包括电脱附及电化学氧化过程。 相似文献
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焦化废水吸附饱和活性炭的超声波再生研究 总被引:1,自引:0,他引:1
浸没式超滤配合粉末活性炭工艺对焦化废水二级生化出水进行深度回用处理,饱和的活性炭采用超声波技术进行再生后重复使用,研究考察以自来水、焦化废水二级生化出水做再生介质的情况下,再生时间、超声波频率对活性炭再生效果的影响,结果表明,自来水再生介质下,活性炭可以达到50%左右的再生效果,而利用焦化废水作为再生介质最多只能达到16%左右的再生效果,但通过与自来水配水,可以达到活性炭脱附再生目的,当焦化废水与自来水体积比为1∶3时,再生率可以达到36%左右,在一定程度上降低了活性炭再生的成本。 相似文献
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M. Angeles Ferro-Garcia Jos Rivera-Utrilla Isidora Bautista-Toledo Carlos Moreno-Castilla 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1996,67(2):183-189
An activated carbon obtained by activation of olive stones in carbon dioxide at 1113 K has been used in this study. This was saturated with o-chlorophenol and m-chlorophenol from their corresponding aqueous solutions. The spent activated carbon samples were regenerated by means of organic solvent treatments and subsequent heat treatments. The organic solvents used were: acetone, methanol, ethanol and benzene. The extent of the chemical regeneration in these systems is a function of the strength of the adsorbent–adsorbate interactions. When the systems are treated with organic solvents the adsorbate extracted mainly comes from the physisorbed fraction. When the samples extracted with organic solvents are thermally regenerated by heating at 1073 K in an inert flow, in most of the cases, the amount of adsorbate removed increased in comparison to treatments without solvents. A part of the physisorbed fraction remaining in these samples after the solvent treatments is released at lower temperatures than the chemisorbed fraction. During the heat treatment, part of the physisorbed fraction is transformed to a chemisorbed one which has a greater desorption energy than the former. 相似文献
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Vicente Gmez‐Serrano Manuel Acedo‐Ramos Cristobal Valenzuela‐Calahorro Antonio Jos Lpez‐Peinado 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2000,75(9):835-839
This study deal's with the feasible use of a commercial activated carbon in the uptake of H2SO4 from aqueous solution and with the regeneration of the spent product. Thermogravimetry TG and FT‐IR spectroscopy are used in the analysis of samples. The activated carbon is a very effective material for the uptake of H2SO4. Using a 9.0 mol dm−3 H2SO4 solution, the mass increase is 37.8 wt%. From the sample obtained, the H2SO4 can be removed largely either by heating at 250 °C for 2 h in a N2 atmosphere or by washing thoroughly with distilled water for 24 h. The mass loss in both cases amounts to 33.6 wt%. The FT‐IR spectroscopy results indicate that the surface chemistry of the carbon is not affected, noticeably, at least, after its contact with the H2SO4 solution. The behavior of H2SO4 toward carbon is compared with that of HNO3. © 2000 Society of Chemical Industry 相似文献
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提出用二氧化碳活化法再生乙酸乙烯合成用触媒载体活性炭工艺。研究了活化温度、活化时间和二氧化碳流量对活性炭吸附性能和得率的影响。确定最佳工艺条件为活化温度1 273 K,活化时间100 m in,二氧化碳流量0.5 L/m in,在此条件下得到的活性炭碘吸附值为1 091.33 mg/g,乙酸吸附值为518.30 mg/g,强度为72%,活化得率为80.33%,并对制得的活性炭做了比表面积测定和孔结构分析。再生后的活性炭强度和乙酸吸附值均达到标准,符合乙酸乙烯合成用触媒载体活性炭的要求。 相似文献
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Phosphotungstic acid/activated carbon (PTA/AC) catalysts with various AC sizes or PTA content have been synthesized and characterized by N2 physisorption, X-ray diffraction, Fourier transform infrared spectroscopy and temperature programmed desorption of ammonia. These catalysts were then evaluated in terms of the removal of dibenzothiophene (DBT) by ultrasound-assisted oxidative desulfurization process. The results showed that the DBT conversion obviously increased with the decrease of AC support size and the increase of PTA content. After supporting PTA on AC, the DBT conversion can be improved by 38.9% after ultrasound irradiation for 10 min. In addition, the stability tests of PTA/AC showed that the catalytic oxidative activity of PTA/AC was nearly kept constant after ultrasound irradiation for 20 min, which makes it a promising catalyst to use in ultrasound-assisted oxidative desulfurization process. 相似文献
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活性炭改性对用于甲酸分解的Pd/活性炭催化剂的影响 总被引:1,自引:0,他引:1
采用磁力搅拌法和水浴振荡法制备应用于甲酸分解的Pd/活性炭(AC)催化剂,研究了活性炭载体改性和制备方法对催化剂分解甲酸性能的影响。采用恒温水浴振荡装置,在80℃水浴中进行甲酸催化分解反应,以甲酸的催化分解率评价催化剂催化活性。结果表明,以经过不同的酸、碱、盐溶液改性后的活性炭为载体采用不同方法制备的Pd/AC催化剂对甲酸的催化分解效果不同,以Na2CO3改性的活性炭为载体采用磁力搅拌法制备的催化剂活性最好,甲酸水溶液的分解率达85%以上,含甲酸的工业废水的分解率达70%。 相似文献