TiO2-SnO2 coated bamboo biochar for electrochemical treatment of coking wastewater

A new type of bamboo biochar (BC) loaded TiO₂-SnO₂ particle electrode was prepared and characterized by SEM, FT-IR, BET and XRD for efficient treatment of the coking wastewater in a three-dimensional electrochemical reaction system(3DERs). The results showed that bamboo biochar had a dense microporous space structure, and a significant amount of Ti-Sn oxides existed on the surface and in the interior of the BC. The removal rates of COD and DOC in coking wastewater reached to 73.96% and 66.72% respectively, and UV₂₅₄ reduced from 6.65 cm^-1 to 3.00 cm^-1 by the electrolysis treatment of 150 min at the current density of 30 mA/cm². The three-dimensional fluorescence spectra indicated that the most of the soluble organic compounds and soluble microbial by-products were degraded and transformed. The addition of Ti and Sn enhanced the efficacy of the electrooxidation, electro-adsorption and electrocatalytic behavior of the BC particle electrodes, which improved the treatment effect on coking wastewater in the 3DERs. In addition, this study provides the possibility of basic research for the engineering practice of electrochemical oxidation treatment of coking wastewater.     

LiF-NaF-KF-K2 TiF6-KBF4熔体中电沉积TiB2的阴极过程

采用循环伏安法研究了700℃时46.5LiF-11.5NaF-42KF(摩尔分数,%)熔盐中Ti(Ⅳ)(c(K2TiF6)=0.2 mol/L)和B(Ⅲ)(c(KBF4)=0.4 mol/L)在铂电极上的电化学还原机理,计算了各还原步骤传递的电子数。研究了LiF-NaF-KF-K2TiF6-KBF4(c(K2TiF4)=0.3 mol/L,c(KBF4)=0.3,0.6,0.9 mol/L)熔盐中电化学合成TiB2的阴极过程机理。结果表明:Ti(Ⅳ)的电化学还原为三步电荷传递反应,且阴极过程近似可逆;B(Ⅲ)在铂电极上的电化学反应机理为简单的三电子一步反应,阴极过程近似可逆;Ti(Ⅳ)和B(Ⅲ)可在同一电位下发生共沉积并反应生成TiB2。     

Analysis of corrosion behavior of LY12 in sodium chloride solution with wavelet transform technique

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔｕｄｙｏｆｓｐｏｎｔａｎｅｏｕｓｃｕｒｒｅｎｔｏｒｐｏｔｅｎｔｉａｌｆｌｕｃ ｔｕａｔｉｏｎｓ,ｗｈｉｃｈｈａｓｂｅｅｎｄｅｓｉｇｎａｔｅｄａｓｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｎｏｉｓｅ(ＥＮ) ,ｆｏｒｔｈｅｃｈａｒａｃｔｅ     

DEVELOPMENT OF Sr_（0．69）La_（0．31）F_（2．31）＋SrSSOLID ELECTROLYTE SENSOR AND ITS APPLICATION

ＤＥＶＥＬＯＰＭＥＮＴＯＦＳｒ_（０．６９）Ｌａ_（０．３１）Ｆ_（２．３１）＋ＳｒＳＳＯＬＩＤＥＬＥＣＴＲＯＬＹＴＥＳＥＮＳＯＲＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮＺｈａｉ；ＹｕｃｈｕｎＭａ；ＰｉｎｇＴｉａｎ；ＹａｎｗｅｎＸｉａｏ；ＦｅｉＪｉ；Ｃｈｕｎ?..     

制粉工艺对贮氢合金电化学性能的影响研究

研究了干法、湿法和湿法加添加剂三种制粉工艺对贮氢合金电化学性能的影响 ,结果表明 :制粉工艺对合金粉末的表面形貌、粒度分布、氧含量均存在很大的影响 ,并影响到其电化学性能。当采用湿法制粉工艺时 ,贮氢合金电极的活化性能较干法制粉明显改善 ,若加入一定量的添加剂 ,活化性能进一步提高 ,第一次放电容量即达到2 78mAh·g-1,第二次放电容量达到合金电极的稳定容量 32 2mAh·g-1。湿法制粉对贮氢合金电极的循环稳定性能有一定的负面影响 ,这可能与贮氢合金粉末表面的氧化和细粉相对含量较多有关 ,然而 ,当加入一定量的添加剂以后 ,贮氢合金电极的氧含量得到有效的控制 ,3C充放循环稳定寿命达到 5 0 0次 ,与干法制粉工艺接近。     

Characteristics of graphite felt electrode electrochemically oxidized for vanadium redox battery application

The graphite felt was oxidized at a positive electrode potential in sulfuric acid solution.The electrochemical performance of the treated graphite felt served as electrode for vanadium redox battery was investigated with FT-IR,SEM,XPS,BET,cyclic voltammetry and testing VRB system,respectively.The results show that the molar ratio of O to C increases from 0.085 to 0.15 due to the increase of—COOH functional groups during electrochemical oxidation treatment,and the GF surface is eroded by electrochemical oxidation,resulting in the surface area increase from 0.33 m2/g to 0.49 m 2/g.The VRB with modified GF electrode exhibits excellent performance under a current density of 30 mA/cm 2 .The average current efficiency reaches 94%and average voltage efficiency reaches 85%.The improvement of electrochemical activity for the electrode is ascribed to the increase of the number of—COOH group and the special surface of GF.     

镍硫化物阳极溶解的电化学研究

研究了合成镍硫化物的阳极过程。Ni_3S_2,Ni_7S_6和NiS的活性溶解伴随着生成表面产物层,其反应机理与电极电位有关。根据三种不同类型产物层生成规律的电化学研究,Ni溶出表观电子数的测定,以及产物层相组成分析和相的元素分析,认为存在三组平行反应:直接生成HSO_4~-或SO_(4-)~2的反应,生成中间硫化物的反应及生成元素硫的反应,每组反应具有不同的优势发展电位区。NiS_2阳极溶解时,基本上为生成HSO_(4-)或SO_(4-)~2的反应。     

纳米复合涂层对碳钢防腐性能的交流阻抗评定

利用电化学阻抗谱法考察了普通涂层、纳米复合涂层 和憎水纳米复合涂层的防腐性能.结果表明，纳米复合涂层的防腐性能明显高于普通涂层， 而经过氟表面活性剂改性的表面憎水的纳米复合涂层的防腐性能更好.     

电化学方法探讨三聚磷酸钛及磁性氧化铁在有机涂层中的缓蚀机制

本文利用电化学方法研究了在油漆涂层中添加三聚磷酸钛和磁性氧化铁对金属防护性能的影响。结果表明,三聚磷酸钛作为活性防锈颜料,添加在涂层中能够极大地改善涂层的防护性能,磁性氧化铁亦不失为一种较好的防锈颜料,但性能不及三聚磷酸钛。同时亦探讨了这两种颜料的可能防锈机理。     

卷绕铅酸电池泡沫铅负极电化学行为的研究

以泡沫铅作为负极集流体制备了卷绕VRLA电池.采用计时电流法、循环伏安曲线、电化学阻抗谱和充放电实验研究了泡沫铅负极的电化学行为,结果表明泡沫铅负极的真实表面积比铅箔负极的大,因此泡沫铅负极具有较低的过电势,并且不论是在怎样的放电状态下,泡沫铅负极的电化学反应电阻较小;与铅箔负极相比,在10、5和2小时率放电状态下,泡沫铅负极的质量比容量分别增加25.9%,30.0%和48.2%.此外,SEM观察显示,泡沫铅负极表面活性物质为更加细小的晶体颗粒和具有更高的孔率.