ACS Omega
·
2022
·
IF 4.132
Xiubo Tian,Ying Chen,Yong Chen,Dong Chen,Quan Wang,Xiaohong Li
The removal of gaseous hydrogen sulfide using FeOCl/H2O2 was studied. The effects of the FeOCl dosage, the H2O2 concentration, the reaction temperature, and the gas flow rate on the removal of H2S were investigated. The reaction products were analyzed, and the characterization of FeOCl was carried out by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and electron paramagnetic resonance spectroscopy. Furthermore, radical quenching experiments were carried out using butylated hydroxytoluene, isopropanol, and benzoquinone. It was found that the H2S removal rate for a H2S gas concentration of 160 ppm reached 85.6% when bubbling through 100 mL of an aqueous solution containing FeOCl (1 g/L) and H2O2 (0.33 mol/L) at 293 K with a flow rate of 135 mL/min. Although the dissolution of chlorine in FeOCl was found to result in reduced catalytic performance, the activity was restored after soaking the catalyst in concentrated hydrochloric acid (37%) and subsequent calcination. The mechanism of H2S removal was also discussed, and it was found that this process was controlled by H2S diffusion. FeOCl was found to activate H2O2 and produce radicals, such as •OH and •O2–, resulting in the formation of a water film rich in radicals on the FeOCl surface. Following the diffusion of H2S into the water film, it underwent oxidation by radicals to produce SO42–. Overall, the catalyst and the product can be effectively separated.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
STARCH-STARKE
·
2024
·Vol. 77
·期 2
·2400050
·
IF 2.6
Xuesheng Qin,Chengzheng Wang,Zhe Zhang,Wei Ma
Hexavalent chromium (Cr(VI)) has attracted much attention because it is a harmful pollutant. In this study, acid hydrolyzed hydrothermal double modified starch (AHS) and hydroperoxide oxidized starch (HOS) are prepared from natural starch and used for the reduction of chromium (VI) in aqueous systems. The effects of hydrothermal acidolysis and oxidative modification of starch on the reduction rate of Cr(VI) are discussed, including the changes of solubility, swelling power, particle size, content of straight-chain starch, and carbonyl/carboxylic group content. The results of response surface methodology (RSM) optimization show that the influence of reaction conditions on the reduction rate of Cr(VI) by NS is as follows: reaction time > initial pH of solution > reaction temperature > starch to Cr(VI) mass ratio; and on the reduction rate of Cr(VI) by AHS and HOS is as follows: initial pH of solution > reaction time > starch to Cr(VI) mass ratio > reaction temperature.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Bin Li,Ting Zhang,Zhaoguang Yang
Response surface methodology was employed to investigate the effects of nitrogen ( X 1 ), phosphorus ( X 2 ), and glucose ( X 3 ) on arsenic removal by fungal-algal pellets. X 1 , X 3 , and X 1 X 3 had significant effects. Arsenic accumulation and transformation were compared among Chlorella vulgaris , Aspergillus oryzae , and fungal-algal pellets under different arsenate and phosphorus concentrations. Fungal-algal pellets had the highest removal rate and was best able to accumulate arsenate in all treatments. The reduction of arsenate to arsenite was found in all tested organisms, while arsenic methylation was only identified in C . vulgaris . The biomass of fungal-algal pellets was not inhibited by arsenate. SEM micrographs showed that arsenic led to a change in mycelial structure from compact to loose pellets. FT-IR spectra showed that four functional groups might be involved in arsenate adsorption. Arsenic tolerance and accumulation in fungal-algal pellets opens the way to its potential application in the remediation of arsenic from contaminated water.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Bingjie Zhang,Jiawen Ji,Xue Liu,Changsheng Li,Meng Yuan,Jingyang Yu,Yongqiang Ma
In this study, nano zirconium carbide (n-ZrC) was synthesized by preceramic polymers method, and it was used to adsorb emodin and physcion from solutions for the first time. The prepared material was characterized by various technologies . The adsorption experiment was carried out to investigate the emodin and physcion removal performance. The results indicate that the pseudo-second-order kinetic model and the Langmuir model correlated satisfactorily to the experimental data, and the thermodynamic parameters are also calculated. Especially, n-ZrC can remove >95% of emodin or physcion in a minute under the optimal conditions, it is the fastest adsorption rate compared to other commonly used adsorbents (commercial zirconium carbide, activated carbon, C18, PSA, GCB and florisil). The adsorption mechanism was discussed, which suggests that Van der Waals' forces are the primary driving power during the adsorption process. Moreover, n-ZrC is stable at different pH and it can be reused at least fifteen times.
研究领域:
环境科学
·
材料科学
·
药物化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2021
·
IF 5.565
Xuefeng Xiao,Yuanyuan Yu,Yongjun Sun,Xing Zheng,Aowen Chen
In this study, three magnetic flocculants with different chelating groups, namely, carboxymethyl chitosan-modified Fe 3 O 4 flocculant (MC), acrylamide-grafted magnetic carboxymethyl chitosan flocculant (MCM), and 2-acrylamide-2-methylpropanesulfonic acid copolyacrylamide-grafted magnetic carboxymethyl chitosan flocculant (MCAA) were prepared, synthesized, and characterized by photopolymerization technology. They were applied to the flocculation removal of Cr(III), Co(II), and Pb(II). The effect of flocculation condition on the removal performance of Cr(III), Co(II), and Pb(II) was studied. Characterization results show that the three magnetic carboxymethyl chitosan-based flocculants have been successfully prepared with good magnetic induction properties. Flocculation results show that the removal rates of MC, MCM, and MCAA on Cr(III) are 51.79%, 82.33%, and 91.42%, respectively, under the conditions of 80 mg/L flocculant, pH value of 6, reaction time of 1.5 hr, G value of 200 s −1 , and precipitation magnetic field strength of 120 mT. The removal rates of Co(II) by MC, MCM, and MCAA are 54.33%, 84.99%, and 90.49%, respectively. The removal rates of Pb(II) by MC, MCM, and MCAA are 61.54%, 91.32%, and 95.74%, respectively. MCAA shows good flocculation performance in composite heavy metal-simulated wastewater. The magnetic carboxymethyl chitosan-based flocculant shows excellent flocculation performance in removing soluble heavy metals. This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove heavy metals in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 45
·64307-64321
·
IF 4.223
Yang Hang,Cai Jiaxi,Sun Jianfa,Zhou Zejun,Zhang Yi,Xia Shibin
In this study, demulsification separation-Fenton oxidation technology was employed as a combined technology to treat total petroleum hydrocarbons (TPH) in oil-based drill cuttings (OBDC). Batch experiments were carried out to optimize the technology parameter. Under the optimal condition, 70% and 51% TPH removal rate was obtained for demulsification technology and Fenton oxidation technology, respectively. Eighty-five percent of TPH removal rate was obtained using combination technology of demulsification separation and Fenton oxidation. Multiple characterizations were used to analyze the physical and chemical properties of treated OBDC. The result of XRD pattern indicated the combination technology had no obvious effect for structure phase of OBDC. The results of FTIR, GC-MS, TG-DTG and SEM were used to characterize the treated OBDC. This paper provides an efficient and feasible combined technology for OBDC treatment, which expands a new strategy for the removal of TPH from solid waste
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·Vol. 55
·期 2
·772-781
·
IF 2.4
Tian Qinghua,He Zhiqiang,Xu Zhipeng,Li Dong,Guo Xueyi
High-purity tellurium is a supporting material for contemporary high-tech industries. Zone refining is commonly used as a reliable final purification step to achieve higher purity levels of tellurium. However, the removal of Selenium (Se)—the most troublesome impurity in tellurium often occurring in quite high amounts—stays as the challenge during zone refining, due to its very unfavorable distribution coefficient. In addition, there is an important factor, essential to predict the zone refining efficiency (required number of passes), which is still seldom explored. Therefore, in the present work, the effect of different number of passes on the purification effect of tellurium was investigated by using 4N tellurium as raw material. Firstly, the possibility of removing vaporized Se through introducing an reductive gas flux was studied by testing initial concentrations of Se (13 ppm) and undergoing different process parameters. The experimental results showed that when the number of passes was 3, the impurity removal rate was low and the purification effect was poor; when the number of zone refining reached 9, the removal rate of most impurities in tellurium reached 100 pct, the removal rate of impurity Se reached 80.15 pct, and the total removal rate reached 89.49 pct, and the purity of tellurium ingot was 5N7.
研究领域:
材料科学
·
冶金学
·
半导体技术
✓ 已验证
DOI
高影响因子
Bioresource Technology Reports
·
2019
·
IF 0
Yingxue Gong,Zhibin Fu,Menglian Liu,Yu Dai,Jianghai Lin,Zehuan Liu
The alkalis sodium ethoxide and calcium hydroxide were combined to pretreat the abundant agricultural waste sugarcane leaf (SCL). The pretreatment conditions were optimized using single factors and orthogonal array, and the results of material's chemical compositions and enzymatic hydrolysis were investigated. The optimized conditions were pretreating SCL with C 2 H 5 ONa:Ca(OH) 2 volume ratio of 4:1 at 121 °C for 30 min. Under these conditions, the lignin removal rate of SCL was 86.26%, while the total reducing sugars and total enzymatic efficiency of enzymatic hydrolysis could reach 14.82 g/L and 80.02% respectively. These pretreating and hydrolysis results were similar compared with those of SCL pretreated with strong base C 2 H 5 ONa alone. But the strong base dosage was saved 20% and the pretreatment time was shortened to 30 min. Therefore the combined alkali pretreatment could significantly save energy and reduce environmental pollution, which made it a promising method in large-scale production.
研究领域:
生物能源
·
农业废弃物利用
·
生物质转化
✓ 已验证
DOI
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
·
2018
·
IF 2.582
Ke Wang,Ying Yan,Ping Zhou,Kang Shi,Dongming Guo
Electrogenerated Chemical Polishing (EGCP) is a stress-free polishing method which has been verified to be an effective method to obtain an ultra-flat and ultra-smooth copper (Cu) surface without defects induced by mechanical force. However, the surface roughness deterioration and removal rate decline emerged after polishing for a long time which prevents the application of EGCP in Cu ultra-precision manufacturing. In this study, apparent activation energy experiments and energy dispersive spectrometer (EDS) analysis were carried out to explore the mechanism of the Cu surface roughness deterioration and removal rate decline. With the increasing of cupric ions (Cu 2+ ) concentration, the apparent activation energy of the Cu/Cu 2+ reaction increased which inhibited the material removal rate consequently. Furthermore, it was found that Cu micro bumps were generated on the surface which was speculated to result from the disproportionation reaction of cuprous ion (Cu + ) induced by high concentration of Cu 2+ . Based on this study, lifting the working electrode (WE) with a fixed time interval was verified to be an effective way to avoid the deterioration of surface roughness and the decline of the material removal rate. This study contributes to a further understanding of the chemical etching mechanism of Cu in EGCP.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2014
·
IF 3.065
Yingchun Wu,Yun Wang,Wenli Zhang,Juan Han,Yan Liu,Yutao Hu,Liang Ni
Aqueous two-phase extraction (ATPE) was employed for the extraction and preliminary purification of anthocyanins in grape juice (GA). The influences of such factors as the type and concentration of salt, the concentration of alcohol and the quantity of grape juice, extraction time, system pH and temperature were investigated to obtain the optimal extraction conditions. They were listed as follow: sodium dihydrogen phosphate (NaH 2 PO 4 ) concentration 28% (w/w), ethanol concentration 25% (w/w), the quantity of grape juice 1 mL, temperature 298.15 K, time 1 h and no pH adjustment. Under the optimal conditions, the relative and absolute recovery of GA in the top phase reached 99.35% and 99.26% in one step, respectively, while the sugar-removing rate reached 75.08%. The results of Multistage and scale-up extractions showed that it could remain over 90% GA in the top phase and remove more than 90% sugars after continuous extraction for two times. Scale-up extractions and the GA stability results showed the effectiveness and great potential of this method in processing mass grape juice.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xue-Chun Yang,Yun-Ling Yang,Meng-Meng Xu,Shan-Shan Liang,Xiao-Long Pu,Jian-Feng Hu,Qian-Li Li,Jing-Tai Zhao,Zhi-Jun Zhang
Nitrogen-doped carbon dots (NCDs) synthesized by the low-temperature sintering method show electronegativity rich in −COO–, −CO–NH–, −NH–, and −OH. The structure, morphology, and fluorescence performance of NCDs were successively characterized by Fourier-transform, infrared, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, photoluminescence, ultraviolet (UV), and X-ray fluorescence analyses. On the one hand, NCDs can sensitively detect Pb2+ in water with a detection limit of 3 ppb through the dual response of fluorescence emission spectra and UV absorbance spectra. On the other hand, the negatively charged NCDs combine with various positively charged heavy metal ions (Pb2+, Cu2+, Ni2+, Co2+, and Cd2+) through charge attraction and coordination to form a hydrogel, thereby removing heavy metal ions from the water. Among them, the removal rate of Pb2+ by NCDs is as high as 94.8%. It is the first time that pure NCDs have been used to remove heavy metal ions quickly and easily in the form of a reversible hydrogel. A simple way is to achieve ultrasensitive detection and high-efficiency removal of heavy metal ions in water with unitary NCDs.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 10
·1946
·
IF 3.352
Hong Shen,Zijun Tang,Xiang Xiao,Haiwen Wu,Hang Zhou,Ping Fang,Dingfang Zhu,Jianhua Ge
In this study, Mn-Ce/Al2O3/TiO2catalyst prepared by impregnation method was used for synergistic O3oxidation NO. The catalyst prepared by impregnating Al2O3/TiO2at a Mn:Ce molar ratio of 4:1 showed the best catalytic activity. The catalyst performance showed that when the molar ratio of Mn:Ce was 4:1 and the volume ratio of O3:NO was 1:4, the removal rate of NO could reach 63%, which could increase the removal rate by 40% compared with that of NO oxidized by O3alone. BET, XRD, and TEM characterization results showed that when the molar ratio of Mn:Ce was 4:1, the catalyst specific surface area, and pore capacity were the largest. A large amount of MnOx and CeOx were distributed on the catalyst surface. The XPS analysis showed that the oxidation-reduction and oxygen vacancy of Mn (IV)/Mn (III)/Mn (II) and Ce (IV)/Ce (III), had a synergistic effect on the decomposition of O3into reactive oxygen species(O*), thus improving the catalytic capacity of Mn-Ce/Al2O3/TiO2catalyst for O3. The O2-TPD analysis showed that the oxygen vacancies and oxygen species in the catalyst could be used as the active point of decomposition of O3into O*. The experimental results show that the prepared catalyst can significantly improve the efficiency of ozone oxidation of NO and reduce the amount of ozone. The catalyst can be applied to ozone oxidation denitrification technology.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）