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1.
改性粉煤灰对二甲酚橙的吸附研究   总被引:1,自引:0,他引:1  
研究了改性粉煤灰对二甲酚橙的吸附性能。探讨了吸附时间、溶液初始浓度、吸附剂用量及溶液初始pH对二甲酚橙去除率的影响。结果表明:在pH=11及常温条件下,改性粉煤灰用量为8g/L时对浓度为7.6mg/L二甲酚橙的去除率为85%。  相似文献   

2.
研究改性柿叶对亚甲基蓝的吸附性能,探讨了吸附剂用量、吸附时间、初始浓度、pH值、温度等因素对吸附性能的影响,结果显示:硝酸改性可明显提高柿叶对亚甲基蓝的吸附效果。室温下1L亚甲基蓝溶液(40mg/L),当吸附剂用量1g、吸附2.0h,溶液pH=5~11时吸附效果较好,吸附行为更符合Langmuir吸附等温式,饱和吸附量为100.4mg/g。  相似文献   

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缩水甘油基三乙基氯化铵交联壳聚糖负载到沸石上,制得了交联壳聚糖改性沸石复合吸附剂。复合吸附剂的结构经热重和扫描电镜进行了表征;考察了吸附剂用量、腐殖酸初始浓度、吸附时间、pH值等对腐殖酸吸附效果的影响。结果表明:交联壳聚糖成功地对沸石进行了改性;复合吸附剂对腐殖酸的吸附性能较沸石有显著提高;适宜的吸附条件是:吸附剂用量为2g/L,腐殖酸初始浓度不大于0.01kg/m3,吸附时间为150min,pH≈7,对腐殖酸的去除率为81.4%,最大吸附量为4.07mg/g。  相似文献   

4.
生物质吸附剂——改性玉米芯对印染废水脱色性能研究   总被引:1,自引:0,他引:1  
研究了生物质吸附剂--改性玉米芯对印染废水的脱色特性.考察了吸附时间、pH值、初始浓度、吸附剂用量、温度、染料结构等对印染废水脱色效果的影响,发现主要影响因素为吸附时间、pH值和初始浓度.改性玉米芯时50 mL印染废水脱色的最佳处理条件为:pH值2、对酸性大红和直接深蓝的吸附时间分别为60 min和30 min、初始浓度50 mg·L-1、吸附剂用量1.0 g.在此条件下,脱色率可迭95%以上,实现了以废治废、变废为宝的目的.  相似文献   

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胡巧开 《染料工业》2008,45(1):53-55
探讨了壳聚糖对酸性大红G的吸附脱色性能。试验了吸附时间、溶液初始浓度、吸附剂用量及溶液pH对酸性大红G去除率的影响。结果表明:在pH=6及常温条件下,当壳聚糖用量为6g/L时,对浓度为50mg/L的酸性大红G去除率为98%。  相似文献   

6.
以柿叶为原料,采用硫酸-甲醛和AlCl_3进行改性制备新型吸附剂硫酸甲醛改性柿叶(SCLAl)。研究了SCL-Al对苯酚的吸附性能,探讨了吸附剂用量、吸附时间、初始浓度、pH值、温度等因素对吸附性能的影响。结果表明:pH值、吸附剂用量和吸附时间对吸附率的影响较明显;温度对吸附率的影响较小;SCL-Al吸附1g/L苯酚时,在pH≥7,1L苯酚溶液中吸附剂用量为15g/L,室温条件下吸附60min基本达平衡,吸附动力学符合准二级动力学方程;吸附行为符合Freundlish吸附等温式。  相似文献   

7.
舒世立  陈伟  贾献峰  王磊 《硅酸盐通报》2021,40(9):3046-3052
为了研究膨润土对含酚废水的吸附性能,采用羟基铁柱撑剂对钠基膨润土进行预改性,随后用十六烷基三甲基溴化铵(CTAB)改性,制备CTAB改性铁柱撑膨润土。利用X射线衍射仪(XRD)、红外光谱仪(FTIR)和场发射扫描电镜(FESEM)对改性膨润土的结构和性能进行表征。考察了吸附剂用量、吸附时间、吸附温度、苯酚初始浓度和pH值对吸附性能的影响,研究了吸附热力学和吸附动力学规律。结果表明,CTAB进入铁柱撑膨润土的层间和表面。当吸附剂用量为3 g·L-1、吸附时间为60 min、吸附温度为25 ℃、苯酚初始浓度为300 mg·L-1、苯酚初始pH值为7时,改性膨润土吸附量达到29.7 mg·g-1,吸附过程符合准二级动力学模型和Freundlich热力学模型。  相似文献   

8.
沸石的改性处理及吸附性能研究   总被引:6,自引:0,他引:6  
介绍了沸石改性的方法,讨论了影响沸石吸附性能的因素.实验表明,在废水温度为25℃,pH为6,Cd2 的初始质量浓度为50 mg/L,吸附剂的用量为20g/L,吸附时间为120 min的条件下,改性沸石对镉离子的去除率达到99.12%.  相似文献   

9.
王友 《广州化工》2014,(21):110-112
以橙子皮为原料,磷酸为改性剂,经化学改性手段制备改性橙子皮生物吸附剂,并研究了其吸附性能。通过单因素试验考察了吸附剂用量、p H、初始浓度和吸附时间对吸附性能的影响,并通过正交试验优化吸附条件。结果表明:吸附剂用量为0.12 g、p H=7、初始浓度为4 mol·L^-1、吸附时间为80 min时吸附性能最佳,吸附率可达91.2%。  相似文献   

10.
利用甲醛和硝酸对木屑进行改性,得到甲醛改性木屑和硝酸改性木屑,并比较了2种改性木屑对铬(Ⅵ)的吸附能力,同时探讨了木屑用量、酸度、铬(Ⅵ)的初始质量浓度、时间等因素对吸附效果的影响,废水铬离子的质量浓度为100mg/L时,最佳吸附条件为:pH值1.0,木屑用量1.5g/15mL,吸附时间60min。用2种改性木屑处理含铬(Ⅵ)废水,都取得满意的效果,吸附率达到99.9%。  相似文献   

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Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.  相似文献   

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In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.  相似文献   

14.
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.  相似文献   

15.
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.  相似文献   

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Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.  相似文献   

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