JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Nan Zhao,Kunyuan Liu,Bofang Yan,Ling Zhu,Chuanfang Zhao,Jia Gao,Jujun Ruan,Weihua Zhang,Rongliang Qiu
In the last years, the synthesis and applications of biochar/Fe composites have been extensively studied, but only few papers have systematically evaluated their removal performances. Herein, we successfully synthesized and structurally characterized Fe 0 , Fe 3 C, and Fe 3 O 4 -coated biochars (BCs) for the removal of chlortetracycline hydrochloride (CH). Evaluation of their removal rate and affinity revealed that Fe 0 @BC could achieve better and faster CH removal and degradation than Fe 3 C@BC and Fe 3 O 4 @BC. The removal rate was controlled by the O–Fe content and solution pH after the reaction. The CH adsorption occurred on the O C groups of Fe 0 @BC and the O C and O Fe groups of Fe 3 C@BC and Fe 3 O 4 @BC. Electron paramagnetic resonance analysis and radical quenching experiments indicated that HO and 1 O 2 / O 2 − were mainly responsible for CH degradation by biochar/Fe composites. Additional parameters, such as effects of initial concentrations and coexisting anions, regeneration capacity, cost and actual wastewater treatment were also explored. Principal component analysis was applied for a comprehensive and quantitative assessment of the three materials, indicating Fe 0 @BC is the most beneficial functional material for CH removal.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Boya Hao,Zhiguo Ye,Jilin Xu,Liangliang Li,Juntong Huang,Xinyuan Peng,Duosheng Li,Zhong Jin,Guang Ma
Transforming the intermittent solar and wind energies into green hydrogen energy by water electrolysis is deemed to be a promising approach to substitute traditional fossil energies. However, the scarcity of precious IrO 2 /RuO 2 -based metal oxides for oxygen evolution reaction hinders the large-scale utilization. Here, based on the nanoscale Kirkendall effect , we fabricate nanoporous γ-Ni based solid solution with the simulated FeCoNi surface compositions of Gibeon meteorites by a facile microwave sintering method. A metal (oxy)hydroxide layer with a thickness of approximately 9 nm was formed on the surface of as-prepared electrode after aging, achieving an overpotential of only 254 mV at 10 mA cm −2 and a low Tafel slope of 37.0 mV dec −1 . The electrode exhibits outstanding long-term stability in a wide range of current densities without compromising the electrocatalytic activity, which is attributed to the 3D-interconnected nanoporous structure, synergistic effect of different species, high conductivity and excellent wettability . The fabrication of nanoporous non-precious solid solution architectures which mimic naturally-formed materials provides a feasible strategy for the design of high-performance electrocatalysts towards clean energy applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Haichuan Zhang,Yang Liu,Shiyu Fu,Yulin Deng
Upgrading of lignin derived bio-oil is an essential step for producing sustainable bio-based chemicals and fuel. Taken into account that α hydroxyl is the abundant functional group in lignin, high effective and selective catalytic alcoholysis for cleaving the C α -OH linkages would be desirable. However, an in-depth understanding of the reaction mechanisms involved in the cleavage of C aromatic -C α and C α -O bonds over a novel catalyst is still needed. Herein, we report an efficient liquid-phase hydrogen transfer strategy for the selective hydrodeoxygenation of a non-phenolic lignin model compound, 3,4-dimethoxybenzyl (veratryl) alcohol, under mild conditions. By employing iso-propanol as solvent and H-donor, and palladium nanoparticles immobilized on nitrogen-doped carbon (Pd/CN X ) as efficient multifunctional catalyst, veratryl alcohol dehydroxylation exhibited almost 100% conversion along with very high selectivity for 1,2-dimethoxy-benzene (46%) and 3,4-dimethoxytoluene (54%). Compared with other Pd catalysis, the Pd/CN X has excellent catalytic performances and exhibits higher selectivity for 3,4-dimethoxytoluene under incorporation with 1% HCOOH at 220 °C. The proportion of Pd (0) significantly increases in Pd/CN X catalyst when introduced into N precursor because of its highly dispersed Pd NPs and preventing the reoxidation of Pd (0). The dehydrogenation reaction occurred through the hydrogen generation of a secondary alcohol. Then, the C α -OH and C aromatic -C α bonds of veratryl alcohol were selectively cleaved by catalytic transfer hydrogenolysis . The alcoholysis mechanism is supported by dispersion-corrected density functional theory computations.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Cai Hui,Yiping Zhang,Xin Ni,Qilu Cheng,Yunpeng Zhao,Yuhua Zhao,Linna Du,Hui Jiang
The interactions and mechanisms between soil dissolved organic matter (DOM) and three types of iron-based nanoparticles (NPs), i.e., nanoscale zero-valent iron (nZVI) particles, Fe 2 O 3 NPs, and Fe 3 O 4 NPs, were investigated in short-term exposure experiments. The adsorption results showed that soil DOM was rapidly adsorbed on the surface of the iron-based NPs with the adsorption rate varying according to Fe 3 O 4 > Fe 2 O 3 > nZVI. Spectral analysis results revealed that aromatic DOM fractions with high-molecular-weights were preferentially adsorbed. The binding mechanism was determined as hydrogen bonding and ligand exchange via Fourier transform infrared spectroscopy (FT-IR) analysis. Scanning electron microscopy, FT-IR, X-ray photoelectron spectroscopy, and X-ray diffraction were used to identify the corrosion products of the three iron-based NPs at the adsorption equilibrium. The results suggest that Fe 3 O 4 and/or γ-Fe 2 O 3 and α-FeOOH were the main corrosion products of nZVIs and α-FeOOH was obtained as an aged product of Fe 3 O 4 NPs. Results of Cr(VI) removal tests suggest that the aged nZVI achieved 79.87% of Cr(VI) removal and the Cr(VI) removal efficiency was significantly improved by coating DOM onto Fe 2 O 3 NPs. The overall data indicate the fate and transformation of iron-based NPs and the enhancement for Cr(VI) removal after interactions between DOM and NPs.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Maolin Wang,Canyang Hu,Jiahui Xu,Xudong Jing,Hafeez Ur Rahim,Xiyun Cai
Cadmium (Cd) is one of the most toxic substances released in the environment. Cd-contaminated soils usually have a large pool of bioavailable Cd species and lead to excessive Cd accumulation in planted cereal crops. Treatment methods for stable immobilization of Cd in soils are desirable. Here we reported that facile combinations of thiosulfate (STS) and zerovalent iron (ZVI) reinforced Cd immobilization in soils and reduced Cd accumulation in wheat. STS mildly activated Cd in soils through the formation of soluble Cd(S 2 O 3 ) x complexes, whereas intermediates of STS (e.g., sulfate and sulfides) and ZVI synergically facilitated immobilization of Cd in soils. The synergy was ascribed to the facilitated formation of FeOOH with high Cd-binding affinity and formation of stable sulfate-Cd-FeOOH complexes and poorly available CdS x . STS-ZVI treatments increased residual Cd in soils by 101–123% and decreased Cd accumulation in wheat shoots by 13–68%, depending on chemical compositions and doses of binary reagents. Field applications of STS and ZVI (0.06–0.11 kg/m 2 ) demonstrated 24–39% reductions of grain Cd.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Shengnan Chen,Jing Deng,Cheng Ye,Chengcheng Xu,Lingyi Huai,Xiao Ling,Jun Li,Xueyan Li
Pre-magnetized Fe 0 /persulfate (pre-Fe 0 /PS) process was innovatively employed for controlling the pollution of p -arsanilic acid ( p -ASA). This process showed favorable removal performance, achieving almost complete elimination of 10 mg/L p -ASA within 30 min at the reaction conditions of 0.2 g/L pre-Fe 0 and 1 mM PS. The increase of PS concentration and pre-Fe 0 dosage was conducive to the degradation. The coexistence of Cl − , NO 3 − and SO 4 2− accelerated the removal, however the presence of HCO 3 − and HA presented the opposite trend. The p -ASA degradation decelerated gradually with increasing pH from 5 to 9. Its removal was caused by the attack of reactive oxygen species (i.e., SO 4 − , OH, O 2 − ), which could be continuously formed via the Fe 2+ /Fe 3+ cycle in solution and on pre-Fe 0 surface. In pre-Fe 0 /PS system, SO 4 − in solution, surface-bound SO 4 − , OH, OH in solution, O 2 − in solution and Fe(IV) contributed to the p -ASA degradation. A plausible transformation route related to the break of C-N and As-C bonds, the substitution of OH group was put forward. More importantly, the released inorganic arsenic during p -ASA decomposition could be effectively controlled through multiple functions including the precipitation, co-precipitation and sorption, which was well confirmed by XPS, FTIR and XRD analysis. Pre-Fe 0 /PS and Fe 0 /PS pretreatments both reduced the generation of C-DBPs except for chloral hydrate, while increased the formation of N-DBPs except for trichloroacetamide.
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BIORESOURCE TECHNOLOGY
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2020
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IF 7.539
Guangyi Zhang,Yinghao Shi,Zisheng Zhao,Xiaowei Wang,Ming Dou
Previous studies have found that magnetite can promote the hydrolysis-acidification but inhibit the methanogenesis, while zero-valent iron (ZVI) only promoted the methanogenesis. Therefore, a new two-phase anaerobic digestion model, in which magnetite was added to the first phase, and ZVI was added to the second phase, was proposed to promote both hydrolysis-acidification and methanogenesis and avoid magnetite inhibition. The results showed that in the new model, methane production was improved by 10.2% and 18.1% and chemical oxygen demand (COD) removal was improved by 7.9% and 10.9% compared with reactors that included only magnetite and only ZVI, respectively. In the new model reactors, inhibition of methanogenesis by magnetite was avoided compared with that of the magnetite-only reactors, and hydrolysis efficiency was improved via dissimilatory iron reduction (DIR) compared with that of ZVI-only reactors. The data on volatile fatty acids (VFAs), coenzyme F 420 and electron transfer system (ETS) further confirmed these conclusions.
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Functional Materials Letters
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2020
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IF 2
Yao Liu,Ciqun Xu,Huan Ren,Zaixin Wei,Zidong Zhang
Meta-composites with negative permittivity are promising candidates for future electronics such as microwave absorbers, novel capacitors, etc. In this work, we proposed to develop the Fe/BaTiO 3 meta-composites with tuneable negative permittivity. Fe content influenced the conductivity of composites and even led to the change of the conductive mechanism. The tuneable permittivity behavior was achieved by controlling the Fe fraction, and the plasma oscillation theory was employed to explain the negative permittivity behavior. Meanwhile, a frequency-switched negative permittivity was observed in this composite, which could be used to extend applications of meta-composites.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Junlei Zhan,Beibei Wang,Liangliang Zhang,Bao-Chang Sun,Jiwen Fu,Guang-wen Chu,Haikui Zou
This work presented experimental and modeling studies on the simultaneous absorption of H2S and CO2 into the N-methyldiethanolamine (MDEA) and piperazine (PZ) solution in a rotating packed bed (RPB). The effect of different operating conditions, including MDEA concentration (CMDEA), PZ concentration (CPZ), liquid volumetric flow rate (L), temperature (T), and high gravity factor (β) on the absorption efficiencies of H2S and CO2 (ηH2S and ηCO2) were investigated. The results showed that ηH2S and ηCO2 were significantly affected by CMDEA, CPZ, L, and β. ηH2S and ηCO2 could reach 99.98 and 96.51%, respectively. Furthermore, an artificial neural network (ANN) model was established to predict ηH2S, ηCO2, and mass-transfer coefficient (KGa). Results showed that the predicted values were in good agreement with the experimental values (within deviations of ±10% for H2S and CO2). This work provides a potential technology of simultaneous absorption of H2S and CO2 for the biogas upgrade.
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CHEMOSPHERE
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2020
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IF 5.778
Meimei Du,Yongqing Zhang,Xianlin Zeng,Hainan Kuang,Shaobin Huang
In this study, the effect of ball milling on pyrite (FeS 2 ) promoting arsenic (As) removal by zero-valent iron (Fe 0 ) was investigated. The influences of different mass ratios of ball-milled FeS 2 /Fe 0 , the dosage of ball-milled FeS 2 /Fe 0 used and initial pH value were evaluated by batch experiments. The results showed that the ball-milled FeS 2 /Fe 0 system had a higher total As removal efficiency than the mixed FeS 2 –Fe 0 system, ball-milled FeS 2 and ball-milled Fe 0 systems in equal mass. Higher As removal efficiency in ball-milled FeS 2 /Fe 0 system was primarily related to the accelerated corrosion of Fe 0 , which was supported by the determination of total Fe 2+ release and electrochemical experiments. SEM-EDS and XPS characterizations revealed that there were iron sulfides (Fe(II)–S and Fe(III)–S) produced on the surface of Fe 0 in ball-milled FeS 2 /Fe 0 , which could facilitate the electron transfer of Fe 0 and enhanced the corrosion of it. BET test also indicated that ball-milled FeS 2 /Fe 0 possessed a higher specific surface area than ball-milled Fe 0 . In addition, the results also showed the optimum mass ratio of FeS 2 and Fe 0 in ball-milled FeS 2 /Fe 0 to remove As ([As(III)] = 2 mg/L) was 1:1, and the optimum dosage was 0.5 g/L, thereby indicating the optimal As:Fe 0 molar ratio was about 1:168. And the removal rate of As by ball-milled FeS 2 /Fe 0 was faster in acidic condition than that in alkaline condition. These findings suggest that Fe 0 -based arsenic removal efficiency can be enhanced by ball-milling with FeS 2 , making it more feasible for remediation of arsenic-polluted water.
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Journal of Environmental Sciences
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2020
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IF 4.302
Xiaoyang Fan,Yili Wang,Daxin Zhang,Yajie Guo,Shihui Gao,Enrui Li,Huaili Zheng
The effects of four conditioning approaches: Acid, Acid-zero-valent iron (ZVI)/peroxydisulfate (PMS), Fe(II)/PMS and ZVI/PMS, on wastewater activated sludge (WAS) dewatering and organics distribution in supernatant and extracellular polymeric substances (EPS) layers were investigated. The highest reduction in bound water and the most WAS destruction was achieved by Acid-ZVI/PMS, and the optimum conditions were pH 3, ZVI dosage 0.15 g/g dry solid (DS), oxone dosage 0.07 g/g DS and reaction time 10.6 min with the reductions in capillary suction time (CST) and water content (Wc) as 19.67% and 8.49%, respectively. Four conditioning approaches could result in TOC increase in EPS layers and supernatant, and protein (PN) content in tightly bound EPS (TB-EPS). After conditioning, organics in EPS layers could migrate to supernatant. Polysaccharide (PS) was easier to migrate to supernatant than PN. In addition, Acid, Acid-ZVI/PMS or Fe(II)/PMS conditioning promoted the release of some polysaccharides containing ring vibrations v P O, v C-O-C, v C-O-P functional groups from TB-EPS. ESR spectra proved that both radicals of SO 4 - · and ·OH contributed to dewatering and organics transformation and migration. CST value of WAS positively correlated with the ratios of PN/PS in LB-EPS and total EPS, while it negatively correlated with TOC, PN content and PS content in TB-EPS, as well as PS content in supernatant and LB-EPS. BWC negatively correlated to zeta potential and TOC value, PN content, and HA content in supernatant.
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BIORESOURCE TECHNOLOGY
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2020
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IF 7.539
Jibao Liu,Jiaxi Zheng,Yutong Niu,Zhuang Zuo,Junya Zhang,Yuansong Wei
Ammonia inhibition is a prominent problem for anaerobic digestion (AD) of nitrogen-rich organic wastes. This study evaluated the effect of zero valent iron (ZVI) and its hybrid with activated carbon (AC), graphite and Fe-C material on the mitigation of ammonia inhibition under ammonia concentration over 5 g/L, according to the batch mode experiments. Results showed that ZVI (4 g/L) and its hybrid with carbon-based material preserving methane production from ammonia inhibition, with kinetics of shortening lag phase from 4.77 d to 2.62 d or even below 2 d with carbon-based material. ZVI preserved methane production with the enrichment of Methanosarcina (the relative abundance was over 80%), which was mostly derived from the activating hydrogenotrophic methanogenesis through the enhanced DIET but not the changes of ORP and FAN.
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