搜索到2414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
胍基改性葡萄废弃物对废水中Cr(VI)的吸附研究
2025年
通过简单方法成功制备了一种以葡萄废弃物为基础的生物质表面有丰富氨基的功能化材料。1,3-二氨基胍盐酸盐(DGH)被添加到富含单宁的葡萄废弃物中(GW),以改善其理化性质并提高其吸附性能。胍基的改性导致了材料特性的显著变化。该功能化的材料表面有丰富的官能团,可以有效地应用于Cr(VI)的去除。吸附过程表明,静电相互作用是去除Cr(VI)的主要作用机制,同时其他相互作用也可能协同发生。功能化的生物质吸附剂的Cr(VI)最大吸附量(Q_(max))为121.8 mg·g^(-1)。Cr(VI)在DGH功能化吸附剂的吸附热力学研究表明,Cr(VI)在DGH功能化生物质上的吸附是自发的、浓度驱动的单分子层吸附。因此,DGH用来改性生物质材料可以作为一种多功能的吸附剂,应用于废水处理中。
章贞阳
关键词:功能化生物质
茶皂素去除水体中重金属Cr(VI)的综合化学实验设计
2025年
设计一个利用茶籽饼提取物——茶皂素去除水体中重金属Cr(VI)的综合化学实验,明确茶皂素去除Cr(VI)的机制.实验包括用扫描电镜(SEM)和傅里叶变换红外光谱仪(FT-IR)对茶皂素的形貌和结构进行表征,设计化学实验进行茶皂素去除Cr(VI)的性能测试和环境影响因素分析.结果表明,实验设计原理清晰、流程简单、易于操作,能锻炼学生的动手操作、仪器使用、数据处理和报告写作等能力,能让学生了解现代仪器分析技术的应用,并能让学生建立学以致用意识,整体提升大学生综合素质.实验适用于大学本科高年级的综合化学实验,自2020年在化学、应用化学和环境工程专业中成功开设,效果显著.
胡月黄鑫程家源陶春瑶卢文贯王小兵
关键词:茶皂素综合化学实验
Comparative mechanisms of Cr(VI)adsorption on biosynthetically derived iron-minerals
2025年
In this study,Schwertmannite,Akaganéite and ammoniojarosite were biosynthesized by different bacteria and characterized.The results showed that bacteria are critical in mediating the mineral formation process:the morphology,crystallinity,grain size and specific surface area of each mineral varied upon different bacteria and culturing conditions.In addition,the formed minerals’elemental composition and group disparity lead to different morphology,crystallinity and subsequent adsorption performance.In particular,adsorption difference existed in iron minerals biosynthesized by different bacteria.The maximal adsorption capacities of Akaganéite,Schwertmannite and ammoniojarosite were 26.6 mg/g,17.5 mg/g and 3.90 mg/g respectively.Cr(VI)adsorption on iron-minerals involves hydrogen bonding,electrostatic interaction,and ligand exchange.The adsorption only occurred on the surface of ammoniojarosite,while for Akaganéite and Schwertmannite,the tunnel structure greatly facilitated the adsorption process and improved adsorption capacity.Thus,the molecular structure is the primary determining factor for adsorption performance.Collectively,the results can provide useful information in selecting suitable bacteria for synthesizing heavy-metal scavenging minerals according to different environmental conditions.
ZHANG KeZENG Xiang-fengWANG JunGAN MinZHU Jian-yuHE QiangHAZEN Terry C.LIU Jun-wuFANG Ying-chun
关键词:BIOMINERALIZATION
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
氨基改性聚丙烯腈多孔纳米纤维膜的制备及其对Cr(VI)的吸附性能
2025年
本研究利用静电纺丝技术制备了聚丙烯腈(PAN)纳米纤维膜,采用聚乙烯亚胺(PEI)对水解后的聚丙烯腈多孔纳米纤维膜进行氨基化改性,得到了H-EPPAN-PEI纳米纤维膜,利用FT-IR、SEM和TG对H-EPPAN-PEI进行表征分析,研究了该材料对Cr(VI)的吸附性能。实验结果表明:该电纺纳米纤维膜对Cr(VI)的最佳pH值为2,吸附平衡时间为3 h,其吸附动力学符合伪二级动力学模型。对Cr(VI)的最大吸附量为425.56 mg·g^(-1)。在阴离子竞争吸附实验中,表现出良好的选择性。经10次吸附-解吸循环后,吸附率仅下降4%,表现出良好的重复利用性能。本研究为Cr(VI)的去除提供了一种有前景的解决策略。
高京吴金丽刘嘉鑫曹帆戴桂林
关键词:纳米纤维膜聚丙烯腈
基于多异质结构二氧化钛光电极同步去除污水中抗生素和Cr(VI)的方法
本发明涉及一种基于多异质结构二氧化钛光电极同步去除污水中抗生素和Cr(VI)的方法,以Ag/AgVO<SUB>3</SUB>QDs@3D TiO<SUB>2</SUB>光电极为工作电极、3D TiO<SUB>2</SUB...
张亚男高雨晴马海英
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

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