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[目的]研究凹凸棒土对苯酚的吸附效果及生物再生条件.[方法]用苯酚溶液模拟含酚废水,研究吸附剂投加量、pH、温度等因素对凹凸棒土吸附苯酚的影响及最佳条件.[结果]凹凸棒土吸附苯酚的最佳条件为吸附剂投加量4 g/100 ml、吸附温度40℃、pH10.0、吸附时间40 min,对苯酚的去除率可达27.1%.在pH为4.0、酵母力液浓度2.040 g/L、30℃条件下对吸附饱和的凹凸棒土再生3h,再生后的凹凸棒土达到最佳吸附效果,对苯酚的去除率达到39.07%.[结论]该研究可为含酚废水的处理及凹凸棒土的再生提供指导. 相似文献
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采用固态粒子烧结法在陶土-粉煤灰基体表面制备了纳米级凹凸棒土膜,改善了基体表面形貌,收窄了基体的孔径分布区间。考察了凹凸棒土膜对不同类型离子模拟废水的处理效果,并研究了pH值对凹凸棒土膜截留性能的影响。结果表明:涂覆在陶土-粉煤灰基体上的凹凸棒土膜对Ca2+、PO34-和Cl-等离子均具有一定的截留效果,特别是对高价阴离子的截留效果优异;不同类型离子模拟废水均在特定pH值时出现最低截留率,证明了凹凸棒土膜的截留机理为道南排斥和介电效应,此特定pH值即为等电位点,且等电位点随溶液的不同而发生变化。 相似文献
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一种负载型氮氧化物净化催化剂及制备属于多相催化技术及其环境保护领域,其特征在于是一种在HZSM-5上负载有含钼和铜双金属氧化物的专门用于柴油车及稀燃汽油机车尾气氮氧化物净化的催化剂,分子表达式为:Cu—Mo/ZSM-5。本发明具有以下优点:1)首创性。Cu—Mo/ZSM-5作为一种新型的用于柴油车及稀燃汽油机车尾气中氮氧化物净化催化剂,尚未见文献和专利报道,2)高活性。在空速为60000~80000h^-1等接近实用条件下,多次对不同Cu/Mo比样品的催化活性进行测试, 相似文献
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研究了用凹凸棒土、氧氯化锆和氯化铈制备锆-铈@凹凸棒土复合吸附剂,并通过单因素试验和响应面优化法考察所制备吸附剂对磷的去除性能及再生效果,分析其除磷机制。结果表明:所制备复合吸附剂表面粗糙,对磷的吸附主要基于羟基与磷酸根的配位交换;在废水初始磷质量浓度10 mg/L、pH=6.0、吸附剂用量1.6 g/L、吸附时间120 min条件下,磷去除率达96.31%,且去除效果稳定;用盐酸再生吸附剂,重复脱附—吸附3次,磷去除率仍保持在76%以上;磷浓度-pH及磷浓度-复合吸附剂用量对去除率的交互影响显著。 相似文献
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为探究Keggin离子改性凹凸棒土用于去除水溶液中Zn(Ⅱ),采用XRD、SEM、AFM、TG和XPS技术对改性土进行表征,并利用等温吸附、动力学及热力学方程对其吸附机制进行研究。结果显示,改性土于2θ为13.7°、19.9°和27.6°对应衍射面为(200)、(040)和(400)处出现了凹凸棒土的特征衍射峰。SEM分析显示其形貌为棒晶及棒晶束之间形成的聚集体。AFM表征显示该材料表面粗糙度为32.3nm。热重分析表明改性土表面仅有少量有机物。XPS谱图分析显示Zn(Ⅱ)已成功被吸附到改性土表面上,该过程并未发生氧化还原反应。改性凹凸棒土吸附水溶液中Zn(Ⅱ)是一个自发、吸热及熵驱动的过程。采用Keggin离子改性凹凸棒土制成的廉价吸附剂可用于去除水溶液中Zn(Ⅱ)。 相似文献
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利用凹凸棒土比表面积大,吸附能力强的特点,以火焰原子吸收光谱(FAAS)法为检测手段,探讨了凹凸棒土对Cd(Ⅱ)和Ni(Ⅱ)的吸附行为,考察了静态饱和吸附容量,研究了影响其吸附和解吸的主要因素,以及共存离子的影响情况。当pH 4.0、凹凸棒土用量为0.50g时,凹凸棒土对Cd(Ⅱ)、Ni(Ⅱ)的吸附率达到94%以上;以20 mL 0.5 mol/L的HCl可将吸附在凹凸棒土上的Cd(Ⅱ)、Ni(Ⅱ)定量洗脱。凹凸棒土对Cd(Ⅱ)和Ni(Ⅱ)的静态饱和吸附容量分别为32.5 mg/g、25.0 mg/g;本法对Cd(Ⅱ)和Ni(Ⅱ)的检出限分别为31 ng/mL、0.19 ng/mL;相对标准偏差分别为1.1%和0.94%(Cd(Ⅱ):0.30μg/mL,n=11;Ni(Ⅱ):0.80μg/mL,n=11)。在优化的实验条件下,本法用于天然水样中Cd(Ⅱ)和工业废水中Ni(Ⅱ)含量的测定,加标回收率分别为92%~98%和87%~102%。 相似文献
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综述了Cu-Ni合金腐蚀行为的宏观电化学的国内外研究进展.介绍了合金成分、外界环境、腐蚀产物膜及初始表面膜等因素对Cu-Ni合金耐蚀性能的影响,详细介绍了合金元素通过影响腐蚀产物膜的组织结构从而影响腐蚀过程的各种理论,针对目前Cu-Ni合金腐蚀行为的研究不足作出了适当的分析并指出了今后的研究方向. 相似文献
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云南某铜镍矿选矿工艺研究 总被引:2,自引:1,他引:1
针对云南某铜镍多金属矿石进行了选矿试验研究,通过对浮选指标各影响因素的优化,确定了原矿磨矿(60%-200目)-混选-粗精矿再磨(85.7%-200目)分离的工艺流程,可以获得铜品位23.79%、镍品位0.87%、铜回收率94.94%、镍回收率21.42%的铜精矿和镍品位7.01%、铜品位1.19%、镍回收率58.53%、铜回收率1.6%的镍精矿的工艺指标。有价元素铜、镍、银、金、铋等得到了综合回收。 相似文献
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铜镍合金冷凝管产品市场分析 总被引:1,自引:0,他引:1
铜镍合金冷凝管主要用于电力、石油化工、造船、海水淡化和海洋工程等行业。铜镍合金冷凝管在舰船、海洋工程、海水淡化行业具有不可替代性,不锈钢管和钛管无法替代铜镍合金冷凝管在这些领域的应用。在火力发电行业,不锈钢管具有与汽轮机几乎等同使用寿命的优点,具有替代铜镍合金冷凝管的趋势。不锈钢管用于冷凝器的主要缺点是导热性能低,随着社会对提高设备节能性能的要求越来越高,铜镍合金冷凝管的优势越来越显现。 相似文献
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This paper discussed in detail about the BEE component and the characteristics of the different kinds of attapulgite clay ores as well as basalts, weathered basalts in four localities of attapulgite clay deposits of Jiangsu and Anhui Provinces of China. It is concluded that the half-weathered basalts have not distinct REE fractionation and strong weathered basalts have HREE loss in the process of the basalts weathered to form smectite group minerals. And the latefitic montmorillonite clays that formed from the basalts weathering have a distinct Ce positive anomaly, a little MREE loss and LREE and HREE renew enrichment. That reflects the particular oxidation condition in the Earth‘‘ s surface and the adsorption of the colloid solution of the lake water in the basin of the continent in the time of the clays formed. The attapulgite clays produced by the reaction between basahs with lake water in the original place of the basin have same REE characteristics as that of the basalts and the weathered basahs. This shows that REE does not transfer heavily in the progressive chemical weathering process. The sedimentary attapulgite clays have also a similar REE component and characteristic parameters to the basalts and the weathered basalts, and have a distinct Eu negative anomaly and a big value of LREE/HREE, which shows that the sedimentary clay came from the weathered basalts, and BEE partitioning patterns characters of the clays are controlled by the residual material of the weathered basalts. 相似文献
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ZUO Liyan PEI Rongfu SHUAI Kaiye YANG Fengqi ZHU Riwei ZHANG Liemeng 《Canadian Metallurgical Quarterly》2011,85(1)
Magmatic Cu-Ni sulfide deposits are generally associated with mafic-ultramafic rocks and it has not been reported that lamprophyre is one of the surrounding rocks of Cu-Ni sulfide deposits.The Dhi Samir deposit in Yemen,however,is a rare example of Cu-Ni deposits which are hosted in lamprophyre dikes.In this paper,comprehensive research is made on petrology,petrochemistry and isotope geochemistry for Cu-Ni-bearing rocks in the Dhi Samir area and the results show that dark rocks related to Cu-Ni orebodies are sodium-weak potassium and belong to calc-alkaline series lamprophyre,especially camptonite,characterized by enriched alkali,iron and titanium.In these rocks
large-ion-lithophile elements are obviously concentrated,while high field strength elements slightly depleted,showing clear negative anomalies of Ta and Nb,and weak deficiency of Ti.The ∑REE is very high(225.67-290.05 ppm)and the REE partition curves are flat and right-inclined,featuring a LREEenriched pattern with low negative Eu anomalies.Study of magmatic source areas indicates that the rocks have low(87Sr/86Sr)and high εNd(t),and the magmas were probably derived from the enriched
mantle Ⅰ(EM-Ⅰ)end-member.Based on the LA-ICPMS on zircon U-Pb isotope dating,the lamprophyre in the Dhi Samir mining area has an age of 602±2.6 Ma,indicating that the rock was formed in the late Proterozoic and in an intraplate setting due to magmatism of an extensional environment in the post-Pan-Africa orogeny. 相似文献
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拉水峡铜镍矿位于秦祁昆造山系西南缘日月山-化隆新元古代地块中部。赋矿地层为化隆岩群的一套中高级变质岩系, 岩性主要为黑云斜长片麻岩、角闪片岩。因矿区普遍被厚50~150 m 的古近系-新近系西宁群紫红色砂砾岩、粘土岩等岩层覆盖, 采用常规的矿产勘查方法很难发挥作用。近几年在该矿区通过1∶5 000地气汞气测量详查工作, 共圈出地气汞气异常11处, 初步认为Ⅰ号和Ⅲ号异常找矿意义最大。结果表明利用地气汞气测量方法对寻找隐伏矿床有一定借鉴意义。 相似文献
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