孔雀石绿-硼酸体系的热变色性能研究

选用羧酸类溶剂,采用固相法合成了孔雀石绿-硼酸系列可逆热致变色材料.考察了孔雀石绿和硼酸的配比、羧酸类溶剂的种类与用量对其热变色性能的影响并探讨了材料的变色机理.结果表明,孔雀石绿-硼酸体系的最佳配比(质量比)为1∶100,最佳溶剂为丙二酸,且m(孔雀石绿)∶m(硼酸)∶m(丙二酸)=1∶100∶10时,颜料变色敏锐,色彩鲜艳,变色温度降低到65 ℃,复色时间为25 s,可逆性好.DSC检测颜料的热变色过程发现,样品在58～72 ℃之间出现一个强的吸热峰.复配物体系的变色机理可归结为分子间的电子得失机理.     

微波强化类Fenton反应催化氧化脱色降解孔雀石绿废水

以超声浸渍-焙烧法制备的Fe2O3/Al2O3为催化剂,研究了微波促进类Fenton反应催化氧化脱色降解有机染料孔雀石绿及相关机理。考察了溶液pH、H2O2用量、催化剂用量、微波辐射功率及时间等因素对其降解效果的影响。结果表明,催化剂与微波存在协同效应,当pH为3.0时,微波可以明显加快类Fenton法催化氧化脱色降解孔雀石绿溶液,用该方法处理染料孔雀石绿,5 min色度脱除率可达到96.42%。     

水产品中孔雀石绿的研究进展

孔雀石绿(malachite green, MG)因其低廉的价格和显著的杀菌效果常用于水产养殖业，但孔雀石绿有致畸、致癌、致突变等副作用，所以世界上绝大多数国家已经禁止在水产养殖和运输过程中添加孔雀石绿。但由于没有更好的替代品，孔雀石绿这么多年来禁而不止。因此，为了食品安全，建立快速测定水产品中孔雀石绿的方法是迫切需要解决攻克的问题。本文针对近十年来水产中孔雀石绿的前处理和检测方法进行综述。     

孔雀石绿在高岭土上吸附行为和模型研究

研究了孔雀石绿(MG)在高岭土上的吸附行为、等温吸附模型和吸附动力学。分别考察了吸附时间、p H值、高岭土投加量、孔雀石绿初始浓度等因素对孔雀石绿去除的影响。结果表明,吸附时间30 min,高岭土投加量16 g/L,中性条件下就能达到较好的孔雀石绿去除效果。高岭土对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为5.37 mg/g。吸附动力学符合准二级动力学模型。     

孔雀石绿在高岭土上吸附行为和模型研究

研究了孔雀石绿(MG)在高岭土上的吸附行为、等温吸附模型和吸附动力学。分别考察了吸附时间、p H值、高岭土投加量、孔雀石绿初始浓度等因素对孔雀石绿去除的影响。结果表明,吸附时间30 min,高岭土投加量16 g/L,中性条件下就能达到较好的孔雀石绿去除效果。高岭土对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为5.37 mg/g。吸附动力学符合准二级动力学模型。     

茶叶渣对孔雀石绿吸附性能研究

研究了茶叶渣对孔雀石绿(MG)的吸附性能、等温吸附模型和吸附动力学。分别考察了吸附时间、pH值、茶叶渣投加量、孔雀石绿初始浓度、温度等因素变化对孔雀石绿吸附效果的影响。结果表明,吸附时间4 h,茶叶投加量2 g/L,中性条件下就能达到较好的孔雀石绿去除效果。茶叶渣对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为79.37 mg/g。吸附动力学符合准一级、准二级动力学模型。茶叶渣对孔雀石绿的吸附是吸热过程。     

鱼鳞活性生物炭对孔雀石绿的吸附性能研究

以废弃物鱼鳞为原料、磷酸为活化剂制备了鱼鳞活性生物炭,研究了鱼鳞活性生物炭对孔雀石绿的吸附性能,并对吸附过程进行了动力学和热力学分析。结果表明,鱼鳞活性生物炭对孔雀石绿有较好的吸附效果,在吸附温度为40℃、吸附时间为150 min、孔雀石绿初始浓度为1 500 mg·L~(-1)、孔雀石绿溶液体积为25 mL、鱼鳞活性生物炭投加量为0.1 g时,孔雀石绿去除率可达99.43%。鱼鳞活性生物炭对孔雀石绿的吸附过程符合准二级动力学方程,热力学分析表明鱼鳞活性生物炭对孔雀石绿的吸附是吸热、熵增、自发进行的吸附过程。     

茶叶渣对孔雀石绿吸附性能研究

研究了茶叶渣对孔雀石绿(MG)的吸附性能、等温吸附模型和吸附动力学。分别考察了吸附时间、pH值、茶叶渣投加量、孔雀石绿初始浓度、温度等因素变化对孔雀石绿吸附效果的影响。结果表明,吸附时间4 h,茶叶投加量2 g/L,中性条件下就能达到较好的孔雀石绿去除效果。茶叶渣对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为79.37 mg/g。吸附动力学符合准一级、准二级动力学模型。茶叶渣对孔雀石绿的吸附是吸热过程。     

银杏落叶对孔雀石绿的生物吸附作用

利用秋季银杏落叶为生物吸附剂,研究了其对孔雀石绿的吸附性能、等温吸附模型和吸附动力学。考察了吸附时间、银杏落叶投加量、p H值、孔雀石绿初始浓度等因素对孔雀石绿吸附的影响。结果表明,吸附平衡时间2 h,银杏落叶投加量4 g/L,中性条件下就能达到较好的孔雀石绿吸附效果。25℃,银杏落叶对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为74.07 mg/g。吸附动力学可用准二级动力学模型更好的描述。     

银杏落叶对孔雀石绿的生物吸附作用

利用秋季银杏落叶为生物吸附剂,研究了其对孔雀石绿的吸附性能、等温吸附模型和吸附动力学。考察了吸附时间、银杏落叶投加量、p H值、孔雀石绿初始浓度等因素对孔雀石绿吸附的影响。结果表明,吸附平衡时间2 h,银杏落叶投加量4 g/L,中性条件下就能达到较好的孔雀石绿吸附效果。25℃,银杏落叶对孔雀石绿吸附符合Langmuir、Freundlich、Temkin模型,最大吸附量为74.07 mg/g。吸附动力学可用准二级动力学模型更好的描述。     

Fe3+/TiO2光催化剂降解孔雀绿染料的研究

采用快速溶胶法制备纳米TiO2光催化剂,用Fe^3 对其掺杂改性,并进行了催化剂的X-射线衍射分析(XPd3),傅立叶红外光谱分析(FT-IR),BET比表面积的表征,用于光催化降解水中孔雀绿染料的研究．研究了不同催化剂的光催化活性,确定了光催化剂的用量．结果发现60W紫外光辐射80min,孔雀绿可以彻底降解;可见光下,光催化剂对孔雀绿降解120h,其转化率为98%,COD的去除率为75．3%。可见光下孔雀绿的脱色率和COD的变化不一致,并对其产生的原因和孔雀绿的光催化降解机理作了探讨。孔雀绿的光催化降解符合一级动力学反应规律,反应速率常数随催化剂的用量增加而增大,但增大幅度逐渐减小。     

Poly(malachite green) film: Electrosynthesis, characterization, and sensor application

Poly(malachite green) films were synthesized electrochemically on the glassy carbon electrode in the potentiodynamic mode. The characterization and growth mechanism of as-prepared films were studied with FT-IR spectroscopy, UV-vis spectroscopy, cyclic voltammetry, chronocoulometry, and electrochemical impedance spectroscopy. Charge transfer and ion transport of poly(malachite green) films were investigated in the aqueous solutions with different types of supporting electrolytes. The poly(malachite green) film coated glassy carbon electrode showed catalytic ability towards ascorbic acid and dopamine. The difference of the anodic peak potential of ascorbic acid on the poly(malachite green) film modified electrode from that of dopamine was 180 mV. Based on their voltammetric responses, the poly(malachite green) film coated glassy carbon electrode was utilized as an electrochemical sensor for the content determination of ascorbic acid and dopamine simultaneously and separately in pharmaceutical and injections.     

Removal of Basic Dye from Aqueous Solution using Cinnamomum camphora Sawdust: Kinetics,Isotherms, Thermodynamics,and Mass-Transfer Processes

Cinnamomum camphora sawdust (CCS) was employed as a cheap and effective biosorbent to remove basic dye from aqueous solutions. The biosorbent was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Adsorption experiments were carried out in a batch system as a function of initial pH, adsorbent dose and particle size, ionic strength, initial dye concentration, and reaction temperature. The selected basic dye (malachite green) adsorption onto CCS significantly depended on these factors. By comparative kinetic analysis, the rate of sorption was conformed with good correlation to pseudo-second-order kinetics. Equilibrium data were fitted well by Langmuir isotherm with the maximum adsorption capacity of 155.0 mg/g at the temperature of 318 K and pH 7.0 ± 0.1. Thermodynamic parameters proved that malachite green dye biosorption process was spontaneous and endothermic within the investigated temperature range. The mechanism of adsorption was also studied. It was found that the adsorption of malachite green onto CCS was mainly governed by film diffusion. The electrostatic attractions and ionic interactions between malachite green dye and CCS might be responsible for the adsorption process. The comparative investigation suggested that the sawdust could be considered as a potential adsorbent for malachite green dye removal from wastewater.     

Preparation and characterization of p-tert-butyl thiacalix[4]arene imbedded flexible polyurethane foam: An efficient novel cationic dye adsorbent

In this study, a new type of flexible polyurethane foam containing p-tert-butyl thiacalix[4]arene (TC4A) macrocycle was synthesized. TC4A macrocycle was incorporated into polyurethane foam as a part of crosslinking agent as well as glycerol. Structural, morphological, thermal and mechanical properties of this prepared foam were studied and compared with a polyurethane foam based on only glycerol as crosslinking agent, by Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), Thermal gravimetric analysis (TGA), and dynamic mechanical thermal analysis (DMTA). The effect of introduction of TC4A crosslinker on cream time, rise time, apparent density, and water absorbency of the PU foams was evaluated. Moreover, it was shown that new TC4A-based polyurethane foam (TC-PUF) can be a high performance adsorbent for removal of malachite green from aqueous media using batch adsorption technique. The adsorption results indicated that TC-PUF has a high adsorption capacity of 58.82 mg/g for malachite green due to the presence of TC4A macrocycles in the structure of polyurethane foam. The kinetics of adsorption of malachite green was also investigated using the pseudo-first-order and pseudo-second-order kinetic models. The results of kinetic studies showed that the adsorption of malachite green onto TC-PUF followed pseudo-second-order kinetic model.     

Evaluation of Adsorption Characteristics of Malachite Green onto Almond Shell (Prunus dulcis)

The potential usage of almond shell (P. dulcis), which is an agricultural waste product, in the removal of malachite green from aqueous solutions was evaluated with respect to various experimental parameters including contact time, initial malachite green concentration, temperature, adsorbent concentration, etc. The adsorption kinetics of malachite green fitted well the pseudo-second-order kinetic model. The monolayer adsorption capacity of almond shell was found to be 29.0 mg g^?1. The adsorption of malachite green onto almond shell increased with raising the temperature. From the experimental results, almond shell could be employed as a low cost and easily available adsorbent for removal of malachite green in wastewater treatment process.     

硫化锌掺锰量子点用于天然水中孔雀石绿磷光传感的应用研究

根据孔雀石绿对锰掺杂硫化锌量子点(Mn:Zn S QDs)的磷光猝灭作用,建立了一种快速检测天然水样中孔雀石绿的磷光传感新方法。实验结果表明,孔雀石绿浓度在0.04~0.50μmol/L和0.50~1.30μmol/L两个范围内变化时,Mn:Zn S QDs的磷光猝灭值(ΔPL)与孔雀石绿浓度变化呈线性关系,方法的检出限0.02μmol/L。本方法用于天然水加标样品中孔雀石绿的检测,RSD分别为4.98%和2.77%。     

LaCoO_3光催化降解孔雀绿染料的研究

采用硬脂酸溶胶-凝胶法合成出钙钛矿型复合氧化物LaCoO3,用XRD,TEM等手段进行了表征,并以其为催化剂对染料孔雀绿进行降解实验。以高压汞灯为光源,研究了催化时间、催化剂用量、染料起始浓度、溶液pH值以及H2O2加入量对降解率的影响。结果表明,100 mL10 mg/L孔雀绿溶液用0.15 g催化剂降解2 h,降解率达到90.1%,加入适量的H2O2、提高溶液pH值均会提高染料的降解率。     

微波辐射-吸附催化法处理孔雀石绿染料废水的研究

采用微波辐射-活性炭吸附催化法,研究其处理孔雀石绿染料废水的可行性及其影响处理过程的因素和规律。结果表明:微波辐射-吸附催化法对孔雀石绿染料废水具有较好的处理效果,当孔雀石绿染料废水的质量浓度为250 mg/L,活性炭的投加量为36 g/L,辐射电压为165 V,辐射时间为20 min时,脱色率可达83%;增加活性炭用量、处理时间和染料废水浓度均能提高微波-吸附催化法处理孔雀石绿染料废水的脱色率;微波辐射可加快活性炭吸附催化孔雀石绿的速率,具有加速孔雀石绿裂解和氧化速率的作用。     

Mg掺杂TiO_2光催化降解孔雀绿染料的研究

采用溶胶-凝胶法制备的Mg掺杂TiO2光催化剂降解孔雀石绿(MG)染料废水,考察了MG初始浓度、催化剂加入量等因素对其降解的影响。结果表明,Mg的掺杂显著提高了TiO2光催化降解孔雀石绿的活性,当催化剂用量为1.0 g/L,经120 min紫外光照射后,可使30 mg/L孔雀石绿溶液降解率达到84%,同时讨论了光催化机制。     

负载型酞菁钴(Ⅱ)光催化降解孔雀石绿的研究

采用光催化法研究了MCM-41-α-四(2-甲氧基乙氧基)酞菁钴(Ⅱ)催化剂对孔雀石绿降解速率的影响:在室温30℃中性环境下,研究了负载金属酞菁催化剂对4 mg/L孔雀石绿溶液的降解情况,同时研究了催化剂投加量、过氧化氢浓度对孔雀石绿降解的影响并探讨了光催化降解孔雀石绿的动力学规律.实验结果表明:制备的催化剂对孔雀石绿...