搜索到2404篇“ CR(VI)“的相关文章
生物炭铁基功能化钝化去除水中Cr(VI)研究
2025年
铬作为一种常见重金属,在水中常以六价铬Cr(Ⅵ)形式存在,生物毒性强烈。本研究以Cr(Ⅵ)污染物为研究对象,首先制备了生物炭负载纳米零价铁(nZVI@BC)及生物炭负载硫化亚铁(FeS@BC)功能材料,表征分析了材料的表面结构和物化性质。接着通过单因素实验及响应面优化实验探究了最佳反应条件,揭示了生物炭铁基功能化钝化去除Cr(VI)的性能和影响因素,分析了相关机理。研究结果表明:铁基生物炭投加量、pH、Cr(VI)初始浓度以及温度是影响Cr(VI)钝化去除的关键因素。两种材料去除Cr(VI)的机理主要包括物化吸附、化学还原、金属共沉淀。
王俊祥李英华钱杰黄天赐
关键词:CR(VI)FESNZVI
Insight into the crystal facet-dependent Cr(VI)reduction:A comparative study of pyrite{100}and{111}facets
2025年
The migration and transformation of hexavalent chromium(Cr(VI))in the environment are regulated by pyrite(FeS2).However,variations in pyrite crystal facets influence the adsorption behavior and electron transfer between pyrite and Cr(VI),thereby impacting the Cr(VI)reduction performance.Herein,two naturally common facets of pyritewere synthesized hydrothermally to investigate the facet-dependent mechanisms of Cr(VI)reduction.The experimental results revealed that the{111}facet exhibited approximately 1.30–1.50 times higher efficiency in Cr(VI)reduction compared to the{100}facet.Surface analyses and electrochemical results indicated that{111}facet displayed a higher iron-sulfur oxidation level,which was affected by its superior electrochemical properties during the reaction with Cr(VI).Density functional theory(DFT)calculations demonstrated that the narrower band gap and lower work function on{111}facet were more favorable for the electron transfer between Fe(II)and Cr(VI).Furthermore,different adsorption configurations were observed on{100}and{111}surfaces due to the unique arrangements of Fe and S atoms.Specifically,O atoms in Cr_(2)O_(7)^(2−)directly bound with the S sites on{100}but the Fe sites on{111}.According to the density of states(DOS),the Fe site had better reactivity than the S site in the reaction,which appeared to be related to the fracture of S-S bonds.Additionally,the adsorption configuration of Cr_(2)O_(7)^(2−)on{111}surface showed a stronger adsorption energy and a more stable coordination mode,favoring subsequent Cr(VI)reduction process.These findings provide an in-depth analysis of facet-dependent mechanisms underlying Cr(VI)reduction behavior,offering new insights into studying environmental interactions between heavy metals and natural minerals.
Binlin TangJinye LiangZhilin WenYueqiang ZhouZhiqiang YanYihao ZhouPeng HeChunyao GuMin GanJianyu Zhu
关键词:PYRITE
一种检测与去除Cr(VI)的阳离子聚噻吩衍生物及其方法
本发明涉及无机阴离子污染物检测技术领域,具体涉及一种检测与去除Cr(VI)的阳离子聚噻吩衍生物及其方法。该阳离子聚噻吩衍生物具有良好的水溶性,并且在检测中呈现出明显的特异性,能够灵敏的检测Cr(VI)。该结构的化合物在溶...
徐秦峰郭仁姝闵婉妮杨文琴朱懿杰
Highly enhanced removal of Cr(VI)by nZVI in presence of myo-inositol hexakisphosphate:The depassivation performance and multiple electron transfer mechanisms
2025年
The capability of traditional ligand in countering rapid passivation on nanoscale zero-valent iron(nZVI)surface is inadequate,and the precise electron transfer mechanism remains elusive.In this study,we reported that myo-inositol hexakisphosphate(IHP),a redox-inactive organophosphorus in soil,could highly enhance Cr(VI)reduction and immobilization in comparison with typical ligands(TPP,EDTA,oxalate and phosphate).And the effects of IHP concentration,Cr(VI)concentration and initial pH were systematically investigated.Cr Kedge XANES and XPS analysis revealed that Cr(III)was the exclusive form in solid products regardless of IHP existence.Results of ATR-FTIR and FESEM inferred that IHP was adsorbed on nZVI surface via inner-sphere complexation,thus averting encapsulation of[Fe,Cr](OH)_(3)coprecipitate and impeding solid particles agglomeration.Additionally,IHP expedited the production of surface-bound Fe(II),primarily attributable to the interaction between nZVI and oxygen.These surface-bound Fe(II)species played a pivotal role in Cr(VI)reduction.Electrochemical analysis unveiled that IHP lowered redox potential of Fe(III)/Fe(II),thereby facilitating reaction between Fe(II)and Cr(VI),whereas inhibited direct electron transfer from nZVI core to Cr(VI).Our findings proposed a novel potential ligand for alleviating nZVI passivation in Cr(VI)removal and deepened our understanding in the process of electron transfer.
Cheng WangShuijing ZhouFeng JiangYupeng YanXiaoming WangHui YinWenfeng TanXionghan Feng
关键词:NZVI
具有光催化高浓度Cr(VI)的中空非晶N-TiO<SUB>2</SUB>的制备方法
本发明公开了一种具有光催化高浓度Cr(VI)的中空非晶N‑TiO<SUB>2</SUB>的制备方法,以三维Fe<SUB>3</SUB>O<SUB>4</SUB>为结构骨架,超声混合二(2‑羟基丙酸)二氢氧化二铵合钛作为钛...
金成召王彩云闫雪黄婷
曙红Y后修饰Zr-MOF及光化学清除Cr(Ⅵ)离子和活性染料
2025年
为了开发能够高效光催化还原Cr(Ⅵ)和降解活性染料的新型双功能光催化剂,将光敏剂曙红Y(EY)原位内嵌于Zr-MOF中,制备了新型EY@Zr-MOF材料。通过X射线衍射、傅里叶变换红外光谱和扫描电镜等对其进行结构和形貌表征,并探究其光催化还原Cr(Ⅵ)和降解活性深蓝K-R(K-R)的效能。结果显示:在500 W汞灯下,Cr_(2)O_(7)^(2-)的浓度在70 min内从27.99 mg/L降至0.57 mg/L,光催化还原效率为97.94%,还原速率常数为0.0495 min^(-1);相同条件下,360 min内K-R的质量浓度从12.89 mg/L降至0.18 mg/L,光催化降解效率和反应速率常数分别达到98.60%和0.01038 min^(-1)。瞬态光电流响应(TPR)、电化学阻抗(EIS)及电子顺磁共振波谱(EPR)分析发现,光电流强度提升及界面电阻降低是EY@Zr-MOF光催化性能提升的原因;光激发下产生的电子及超氧自由基(·O_(2)^(-))对驱动光催化氧化还原反应起重要作用。
王洋刘洁秦颖彤翟薇丽李庆
胶原生物炭/g-C_(3)N_(4)/WO_(3)复合材料光催化去除水体中Cr(Ⅵ)
2025年
以制革领域中废弃的皮胶原纤维为原料,基于鞣制化学中的矿物鞣制原理,将钨离子负载在皮胶原纤维上,并经过高温热解得到负载氧化钨的生物炭材料(C/WO_(3)),最后采用机械混合法将石墨相氮化碳(g-C_(3)N_(4))与C/WO_(3)进行复合,制备得到g-C_(3)N_(4)/C/WO_(3)光催化剂。采用扫描电子显微镜、X射线衍射和荧光光谱等进行形貌结构和性能的表征,并且以Cr(Ⅵ)作为目标污染物,研究了g-C_(3)N_(4)/C/WO_(3)对Cr(Ⅵ)的去除效果。结果表明,g-C_(3)N_(4)/C/WO_(3)比表面积达到244.62 m2/g,远高于单独的g-C_(3)N_(4)(9.95 m2/g),同时g-C_(3)N_(4)/C/WO_(3)的光催化性能明显提升。Cr(Ⅵ)的去除实验表明,当催化剂用量为0.1 g,Cr(Ⅵ)初始质量浓度为50 mg/L,溶液pH为2时,g-C_(3)N_(4)/C/WO_(3)对Cr(Ⅵ)的去除率高达99.99%,并且几乎不受水中共存物质的影响,循环性能比较稳定。
陈然贾红斌李奕莹李双洋周建飞石碧
关键词:胶原纤维生物碳光催化
CuNPs的合成及在水中Cr(Ⅵ)的检测
2025年
构建了一种基于抗坏血酸修饰CuNPs高选择性检测水中Cr(Ⅵ)的方法。采用一锅合成法,以硝酸铜作为铜源,抗坏血酸作为还原剂,在氢氧化钠溶液的调节下简易合成铜纳米粒子(CuNPs).合成的CuNPs表现出高且稳定的荧光性能,由于内滤效应,Cr(Ⅵ)可淬灭其荧光,因此可作为高灵敏度的Cr(Ⅵ)传感器,从而建立一种Cr(Ⅵ)的荧光检测方法。CuNPs的荧光淬灭效率与Cr(Ⅵ)浓度在(1~10)μmol/L范围内线性相关,线性相关系数R2=0.992 5,检测限为0.100 4μmol/L,该方法可快速、灵敏、选择性地检测Cr(Ⅵ).
杨颖胡一铭刘楠高竹青
关键词:荧光淬灭荧光检测
废弃石粉负载型非晶零价铁的制备及其去除水中Cr(Ⅵ)的性能
2025年
自“双碳”目标提出以来,我国生态环境保护进入了以废弃物循环利用为重点战略方向的关键时期.零价铁在重金属污染治理领域表现出广泛应用前景,但零价铁活性常因其磁性团聚而降低,制备负载型零价铁可增加铁颗粒的分散度.目前研究表明,非晶体零价铁通常具有比晶体零价铁更优异的性能,因此,该研究以廉价易得的废弃石粉(WSP)为载体,以乙二胺为诱导剂,通过液相还原法合成负载型非晶零价铁(WSP-AZVI),有效地解决了零价铁易团聚的问题,同时将Cr(VI)的去除百分率从49%提升至100%.进一步的条件优化结果表明,当WSP-AZVI的含铁量为10%,铁与乙二胺的比例为1∶1时,可获得最佳的Cr(VI)去除效果,该研究为零价铁的进一步广泛应用推广提供了理论指导.
高燕王海莉项园符婷婷全凤娇李建芬裴超申文娟
关键词:非晶零价铁六价铬电镀废水
一种Cr(VI)还原酶及其制备方法和在铬污染水体修复中的应用
本发明公开了一种Cr(VI)还原酶及其制备方法和在铬污染水体修复中的应用,所述Cr(VI)还原酶的氨基酸序列如SEQ ID NO.1所示,所述制备方法为:将核苷酸序列如SEQ ID NO.3所示片段连接至质粒中得到重组质...
刘俊胡文哲常利草方云

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