ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2019
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IF 7.149
Xiaolin Zhang,Ping Huang,Siyao Zhu,Ming Hua,Bingcai Pan
Toxic metals are usually present as organic complexes in high-salinity effluents from various industries. The efficient removal of such metal complexes is an imperative but still challenging task due to their stable structure and high mobility. Herein, we propose a new strategy to remove Cu-carboxyl complexes from high-salinity water by using a commercially available nanocomposite HZO-201, i.e., nanohydrated zirconium oxide (HZO) confined inside anion exchanger D201. In contrast to D201 and a cation exchanger D001, which both adsorb Cu-citrate negligibly, HZO-201 exhibits preferable adsorption toward Cu-citrate (∼130 mg Cu/g-Zr) at high salinity (1.5 wt % NaCl). On the basis of scanning transmission electron microscopy energy-dispersive spectrometry (STEM-EDS), attenuated total reflection Fourier transform infrared (ATR-FTIR), and X-ray photoelectron spectrometry (XPS) analysis, the formation of ternary complex among Cu(II), citrate, and the embedded nano-HZO is evidenced to be responsible for the removal of Cu-citrate. The exhausted HZO-201 can be regenerated with a binary HCl-NaCl solution for repeated use for 5 cycles without capacity loss. Fixed-bed adsorption demonstrates that HZO-201 column is capable of producing ∼1150 bed volume (BV) clean water (<0.5 mg Cu/L) from simulated high-salinity wastewater, whereas only ∼10 BV and ∼60 BV was produced for the D001 and D201 columns, respectively. Furthermore, HZO-201 shows excellent removal of Cu(II) complexes with three other carboxyl ligands (oxalate, tartrate, and succinate).
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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2025
·Vol. 122
·期 12
·e2501354122
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IF 9.1
Leiming Lin,Zheng Li,Jun Ren,Ying Meng,Fubo Luan
The co-occurrence of arsenic and uranium in groundwater has been found in many countries, posing a significant challenge to human health. Here, we have demonstrated the efficient simultaneous removal of arsenic and uranyl-carbonate complexes from groundwater using {001}-TiO2. Surprisingly, the presence of U(VI) greatly enhanced the adsorption of As(V) on {001}-TiO2, while As(V) had a negligible impact on U(VI) adsorption. Through in situ ATR-FTIR spectroscopy, we uncovered a mechanism involving the formation of a ternary surface complex [Ti–U(VI)–As(V)] on the surface of {001}-TiO2. This ternary surface complex formed through the substitution of CO32- from uranyl coordination sites. Furthermore, the adsorbed As(V) and U(VI) can be easily recovered using a sodium hydroxide solution, and {001}-TiO2 can be used repeatedly. Our findings offer a promising solution for the simultaneous removal of As(V) and U(VI) from groundwater and provide valuable insights into the mechanisms involved in their removal.
研究领域:
环境科学
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化学
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DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
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2013
·Vol. 9
·期 2
·248-255
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IF 0.797
Jianxian Zeng,Qiannan Guo,Zhenzhong Ou-Yang,Hu Zhou,Huajun Chen
Polyelectrolyte-enhanced ultrafiltration was investigated for the removal of chromium(VI) anion from aqueous solutions with the help of cationic polyquaternium-6 (PQ6). The ultrafiltration behavior of Cr(VI) aqueous solutions was studied at pH 6. Owing to an effect of electrostatic repulsion, the membrane with a molecular weight cutoff (MWCO) of 10 000 Da rejected about 30% of Cr(VI). Then, ultrafiltration of aqueous solutions of a Cr(VI)–PQ6 complex was further studied. Factors affecting Cr(VI) rejection coefficient ( R Cr ) and permeate flux ( J ) such as pH, polymer metal ratio (PMR), the added salts, temperature, operating pressure and MWCO were investigated. The best operating parameters, such as pH 9 and PMR 10, were obtained in order to achieve high R Cr (>0.97). By increasing the concentrations of the added salts (KCl, KNO 3 and K 2 SO 4 ), R Cr was found to decrease significantly. J decreases slightly in the pH range of 2–5. Cl − or SO 4 2− does not affect J , whereas NO 3 − results in the decrease of J . The binding mechanisms of dichromate, chromate and nitrate with PQ6 were proposed. Finally, the concentration experiment was carried out under the optimal conditions. R Cr was close to 1, and J decreases slightly. Chromium was effectively concentrated by the membrane. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
环境科学
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化学工程
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高影响因子
APPLIED CATALYSIS A-GENERAL
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2020
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IF 5.006
Wenyan Wang,Yunlan Xu,Dengjie Zhong,Nianbing Zhong
Removal of complexation metal from plating effluents is always a problem. In this work, a core-shell structure zero-valent iron@nitrogen/graphite carbon nitride doped carbon (ZVI@C-N/g-C 3 N 4 ) composite was prepared and used to activate peroxymonsulfate (PMS) to treat complexation nickel simulated wastewater. Compared with ZVI, ZVI@C-N/g-C 3 N 4 significantly enhanced the efficiency and repeatability of PMS activation. For 45 min treatment, the removal efficiency of 50 ppm Ni-EDTA and Ni-citrate simulated wastewater reached 95.8 % and 100 %, respectively. The excellent performance of ZVI@C-N/g-C 3 N 4 is attributed to that the amino groups of nitrogen in C-N/g-C 3 N 4 shell can regulate the transmission rate of electrons released from ZVI core by adjusting the transmission rate of H + , so as to improve the electron utilization efficiency of PMS activation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Ya Gao,Xinzhuang Fu,Zujiang Pan,Tong Yue,Wei Sun
Although the relevant direct and revers flotation mechanism has been discussed a lot in diaspore and kaolinite separation, the quantitative analysis of surface-active sites and their reaction descriptions during flotation have not been reported yet. In this study, the hydration and collector adsorption reactions of anionic sodium oleate (NaOL) and cationic hexadecyl trimethyl ammonium bromide (CTAB) onto diaspore and kaolinite were quantized. Surface complexation model (SCM) was referred to obtain intrinsic reaction equilibrium constants. It can be found that for NaOL adsorption, the equilibrium constant of diaspore (10 13.55 ) was obviously bigger than that of kaolinite (10 11.76 and 10 10.35 for ≡AlOH and ≡SiOH, respectively), corresponding to direct flotation of bauxite. While the interaction (10 3.90 for ≡XNR) between the permanent negatively charged site ≡X − and CTAB was much stronger than other sites. Besides, the single adsorbed amount in mixed minerals were successfully predicted at ratios of 1:2, 1:1 and 2:1. Finally, the fitted potential curves were also acceptable to zeta potential tests. These conclusions from SCM calculation can provide strong supports for collector adsorption differences and then help for separation much more efficiently and economically through saving preliminary exploration cost.
研究领域:
矿物加工工程
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物理化学
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高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 15
·e202300287
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IF 2.1
Mengyu Liu,Xiang Yu,Lanting Yang,Guangzai Nong
Graphical In this study, copper-ammonia complexes were utilized as catalysts for the polymerization of hydroquinone. These complexes not only acted as catalysts, but also bound to the poly(hydroquinone) during the polymerization process. With acid hydrolysis to remove the complexes, a thermally stable poly(hydroquinone was obtained with a degree of polymerization of 2–9 and yield of 63.2 %. The copper-ammonia complexes also accelerated the polymerization rate by three times compared to using only ammonia solution, offering potential for improving hydroquinone polymerization efficiency. Poly(hydroquinone) (PHQ) is a class of polymers with a leading chain composed entirely of quinone-phenol structures, which possess both the heat resistance of polymers and the redox activity of the monomer quinone-phenol and have promising applications in sensors, anti-corrosion and antioxidants. However, the current synthesis efficiency is low, and the product solubility is poor, which hinders its wide application. In this paper, the copper-ammonia complex was used to catalyze the polymerization of hydroquinone. The product‘s structure was verified by FTIR, UV-Vis, XPS, SSNMR and EDS. The degree of PHQ obtained by GPC was 2–9, and the reaction mechanism of the polymerization process was demonstrated in detail. The experiments showed that the copper-ammonia complex not only acted as a catalyst but also participated in the reaction, firstly generating the PHQ copper-ammonia complex, which is almost insoluble in water and common organic solvents. Then by further acid washing to dislodge the copper-amino groups, the resulting PHQ was able to dissolve in solvents such as DMSO and methanol. In addition, the method is three times faster than the catalytic rate using an equivalent amount of ammonia.
研究领域:
材料科学
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化学工程
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高影响因子
Water
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2019
·Vol. 11
·期 12
·2532
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IF 2.524
Md. Nahid Pervez,Felix Y. Telegin,Yingjie Cai,Dongsheng Xia,Tiziano Zarra,Vincenzo Naddeo
In this study, a Fenton-activated persulfate (Fe2+/PS) system was introduced for the efficient degradation of Mordant Blue 9 (MB 9) as a textile dye in an aqueous solution. Results showed that the degradation of MB 9 was markedly influenced by operational parameters, such as initial pH, PS concentration, Fe2+concentration, and initial dye concentration. Optimal reaction conditions were then determined. Inorganic anions, such as Cl−and HCO3−, enhanced the degradation efficiency of MB 9 under optimal conditions. Addition of HCO3−reduced the degradation performance of MB 9, whereas the addition of Cl−increased the degradation percentage of MB 9. In addition, quenching experiments were conducted using methanol and tert-butyl alcohol as scavengers, and methanol was identified as an effective scavenger. Thus, the degradation of MB 9 was attributed to SO4•−and•OH radicals. The degradation and mineralization efficiency of MB 9 was significantly reduced using the conventional Fenton process i.e., Fe2+/ hydrogen peroxide (HP) because of the formation of a Fe complex during degradation. Meanwhile, the Fe2+/persulfate (PS) system improved the degradation and mineralization performance.Keywords:Fenton-activated;Fe-complex;persulfate;mordant dyes;scavengers
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
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2024
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IF 9.4
Junyi Yu,Yin Cheng,Anhong Cai,Xianfeng Huang,Qingrui Zhang
Herein, the Cu(III) synthesized from copper plating effluent was developed for the first time to evaluate the onsite degradation performance of heavy metal complexes in the wastewater, thus achieving the purpose of “treating waste with waste”. The results indicated that synthetic Cu(III) presented the excellent decomplexation performance for Cu(II)/Ni(II)-organic complexes. The removal efficiency of Cu(II)/Ni(II)-EDTA significantly increased with increasing Cu(III) dosage, and the degradation of Cu(II)/Ni(II)-EDTA by synthetic Cu(III) system displayed highly pH-dependent reactivity. The radical quencher experiments confirmed that Cu(III) direct oxidation were mainly involved in the degradation of Cu(II)-EDTA. Additionally, the continuous decarboxylation process was proven to be the main degradation pathway of Cu(II)-EDTA in Cu(III) system. The coexisting substances (SO 4 2− , Cl − and fulvic acids) showed little impacts at low level for the removal of Cu(II)/Ni(II)-EDTA, while retarded the degradation of Cu(II)-EDTA slightly at high level, which features high selective oxidation. Encouragingly, it was also effective to remove Cu(II)/Ni(II)-EDTA from in treating actual Cu/Ni-containing wastewater through synthetic Cu(III) treatment.
研究领域:
环境科学
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化学工程
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高影响因子
SPECTROSCOPY LETTERS
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2015
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IF 0.852
Yunfei He,Lifu Liao,Canhui Xu,Shijun Li,Rurong Wu,Yanyan Yang
The formation of a manganese (II) coordination supramolecular polymer was studied by resonance light scattering spectra for manganese (II) detection. Bis-sulfosalophen (a ditopic tetradentate Schiff base ligand) and bis-phenanthroline-glutaraldehyde (a ditopic bidentate ligand) were prepared for the construction of the supramolecular polymer. In a procedure of manganese (II) detection, manganese (II) ion reacts with bis-sulfosalophen to form a binuclear manganese (II) complex. The binuclear complex then self-assembles with bis-phenanthroline-glutaraldehyde to form the supramolecular polymer, resulting in the production of strong resonance light scattering signal. The amount of manganese was detected by measuring the resonance light scattering intensity. Under optimal conditions, a linear range was found to be 0.5–50.0 ng/mL, with a detection limit of 0.1 ng/mL. The method has been successfully applied to determine manganese in vegetable and tea samples with relative standard deviations of less than 5% and recoveries of 95.8–105.7%.
研究领域:
分析化学
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超分子化学
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高影响因子
Journal of Physical Chemistry C
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2017
·
IF 4.536
Xiaopeng Huang,Xiaojing Hou,Fahui Song,Jincai Zhao,Lizhi Zhang
The interaction between ascorbate and hematite facets was systematically investigated with attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, density functional theory (DFT) calculation, and kinetics model. Results of ATR-FTIR spectroscopy and DFT calculation suggested formation of nonprotonated inner-sphere bidentate mononuclear and monodentate mononuclear iron–ascorbate complexes on the hematite {001} and {012} facets, respectively. The estimated reductive dissolution rate constants at pH 5.0 were (4.04 ± 0.16) × 10–4 and (1.59 ± 0.14) × 10–4 min–1 for hematite nanoplates and nanocubes, respectively, indicating that the bidentate mononuclear iron–ascorbate complexes on the {001} facets favored the hematite reductive dissolution process than the monodentate mononuclear iron–ascorbate counterparts on the {012} facets. These results also revealed that the hematite facet reduction with ascorbate was strongly dependent on the iron–ascorbate complexes formed on the hematite facets. This study provides new insights into the reductive interaction between ascorbate and hematite facets and also shed light on the environmental effects of hematite at the atomic level.
研究领域:
环境科学
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材料科学
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化学
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高影响因子
FUEL PROCESSING TECHNOLOGY
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2015
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IF 3.352
Hui Shang,Yu Liu,Jin-Chun Shi,Quan Shi,Wen-Hui Zhang
Most crude oils contain traces of metal complexes, among which vanadium (V) and nickel (Ni) compounds are the most harmful poisons to the catalysts of fluid catalytic cracking (FCC) and hydrogenation units. These metals are proven to be extremely hard to remove, since they exist in crude oil as stable oil-soluble complexes. The microwave technology provides a new way for Ni/V removal, their removal efficiency using chemical reagents and the mechanism of microwave-assisted demetallization were studied in this paper. It was concluded that the demetallization efficiency can be highly enhanced under microwave irradiation . There is no specific structural selectivity for vanadium porphyrins during microwave treatment process. The demetallization agent — methanesulfonic acid , containing a sulfonyl acid group was found to react with VO 2 + and Ni 2 + . Ni and V were removed from porphyrin ring without destroying the ring structure, corresponding water soluble inorganic salts were formed, thus can be successfully separated from crude oil by washing or desalting process.
研究领域:
化学工程
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石油加工
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环境科学
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DOI
高影响因子
Results in Physics
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2017
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IF 0.946
Lang Yang,Feifei Jia,Bingqiao Yang,Shaoxian Song
The adsorption of gold cyanide complex ion (Au(CN) 2 − ) on graphene oxide-polyethylenimine hydrogel (GO/PEI hydrogel) from gold cyanidation has been studied to explore the possibility of the application of GO/PEI hydrogel in gold cyanidation process for extracting gold from ores. The adsorption was carried out in artificial Au(CN) 2 − aqueous solution with GO/PEI hydrogel as adsorbent. The experimental results, as well as IR, XPS and SEM−EDS, have shown that GO/PEI hydrogel exhibited a high adsorption capacity and a fast adsorption rate of Au(CN) 2 − , suggesting that GO/PEI hydrogel might be a good adsorbent for the recovery of Au(CN) 2 − . The adsorption of Au(CN) 2 − on GO/PEI hydrogel obeyed the Langmuir isotherm model and fitted well with the pseudo second order model. The good recovery of Au(CN) 2 − was largely related to the porous structure, large specific surface area, as well as the oxygenous functional groups on the surface of GO/PEI hydrogel.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）