Chemical Speciation and Bioavailability最新文献_第4页

Physiochemical properties of n-n heterostructured TiO2/Mo-TiO2 composites and their photocatalytic degradation of gaseous toluene n-n异质结构TiO2/Mo-TiO2复合材料的物理化学性质及其光催化降解气态甲苯

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1315617

M. Cui, Shuai Pan, Zhe Tang, Xian Chen, X. Qiao, Qi Xu

{"title":"Physiochemical properties of n-n heterostructured TiO2/Mo-TiO2 composites and their photocatalytic degradation of gaseous toluene","authors":"M. Cui, Shuai Pan, Zhe Tang, Xian Chen, X. Qiao, Qi Xu","doi":"10.1080/09542299.2017.1315617","DOIUrl":"https://doi.org/10.1080/09542299.2017.1315617","url":null,"abstract":"Abstract The composite TiO2/Mo-TiO2 were prepared by a modified sol-gel method. The prepared catalysts were characterized by X-ray diffraction, BET analysis, SEM, X-ray photoelectron spectroscopy, and UV–vis diffused reflectance spectroscopy techniques. The structural characterization results demonstrated that Mo was successfully doped into the TiO2 lattice and caused slight changes in the physiochemical properties. The UV–vis DRS showed a red shift of the adsorption edge to the visible region. The photocatalytic decomposition efficiencies of the catalysts were examined with toluene as a typical VOC in a continuous flow reactor. The photocatalytic activity of the n-n heterogeneous TiO2/Mo-TiO2 was greater than that of pure TiO2 and Mo-TiO2, and the catalyst containing a Mo/Ti mole ratio of 2.5% exhibited optimum photocatalytic properties. In general, a relative humidity of 35%, a higher oxygen content, a lower initial toluene concentration, and a higher UV intensity were beneficial for toluene decomposition.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"29 1","pages":"60 - 69"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2017.1315617","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47228161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

Vertical distribution and release characteristics of nitrogen fractions in sediments in the estuaries of Dianchi Lake, China 滇池河口沉积物中氮组分垂直分布及释放特征

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1352460

W. Yang, Hanran Xiao, Ye Li, D. Miao

{"title":"Vertical distribution and release characteristics of nitrogen fractions in sediments in the estuaries of Dianchi Lake, China","authors":"W. Yang, Hanran Xiao, Ye Li, D. Miao","doi":"10.1080/09542299.2017.1352460","DOIUrl":"https://doi.org/10.1080/09542299.2017.1352460","url":null,"abstract":"Abstract Columnar sediment samples were collected from five representative estuaries of Dianchi Lake, China. And the vertical distribution of each fraction of nitrogen (IEF-N, CF-N, IMOF-N, OSF-N) were tested. The results showed that the TN content in sediments from areas A, B, C, D and E gradually decreased with depth between 0 and 15 cm, then sharply decreased with depth between 15 and 30 cm and stabilized at depth below 30 cm, indicating the exogenous input of N in these areas has not been controlled effectively. The proportion of TN occupied by various N fractions in the sediments ranked as follows: OSF-N > IMOF > CF-N > IEF-N. Correlation analysis results showed both IEF-N and IMOF-N were significantly correlated with the content of TFe2O3 + MnO + Al2O3 in deeper sediments, while no correlation in superficial sediments. The areas A and B have extremely high release risks for N in superficial sediments. However, the N in the sediments of areas C, D and E were in relative equilibrium with the overlying water, indicating release potential risk was relatively low.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"29 1","pages":"110 - 119"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2017.1352460","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44690050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Growing, physiological responses and Cd uptake of Corn (Zea mays L.) under different Cd supply 不同镉供应条件下玉米的生长、生理反应及对镉的吸收

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1400924

Tao Ling, Q. Gao, Haolin Du, Qiancheng Zhao, Jun Ren

引用次数: 41

Is the computed speciation of copper in a wide range of Chinese soils reliable? 计算出的中国土壤中铜的形态是否可靠？

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1404437

Bo Li, Yibing Ma, Junxing Yang

引用次数: 3

Transport of natural soil nanoparticles in saturated porous media: effects of pH and ionic strength 天然土壤纳米颗粒在饱和多孔介质中的迁移:pH和离子强度的影响

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1403293

Yanji Jiang, Lin Yu, Huimin Sun, Xianqiang Yin, Changzhao Wang, Shiny Mathews, Nong Wang

{"title":"Transport of natural soil nanoparticles in saturated porous media: effects of pH and ionic strength","authors":"Yanji Jiang, Lin Yu, Huimin Sun, Xianqiang Yin, Changzhao Wang, Shiny Mathews, Nong Wang","doi":"10.1080/09542299.2017.1403293","DOIUrl":"https://doi.org/10.1080/09542299.2017.1403293","url":null,"abstract":"Abstract To understand the effects of ionic strength and pH on the transport of natural soil nanoparticles (NS) in saturated porous media, aeolian sandy soil nanoparticles (AS), cultivated loessial soil nano particles (CS), manural loessial soil nanoparticles (MS) and red soil nanoparticles (RS) were leached with solutions of varying pH and ionic strength. The recovery rate of soil nanoparticles decreased in the order AS > RS > MS > CS. Transport of soil nanoparticles was enhanced with increasing pH and decreasing ionic strength and was attributable to changes in the Zeta potential of NS. Deposition of NS was also affected by the composition of soil nanoparticles and the surface charge. Column experiments showed that the interaction between soil nanoparticles and saturated quartz sand was mainly due to the physical and chemical properties of soil nanoparticles. The Derjaguin–Landau–Verwey–Overbeek interaction energies between NS and sand were affected by pHs and ionic strengths. Soil nanoparticles transport through saturated porous media could be accurately simulated by the one-dimensional advection-dispersion-reaction equation.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"29 1","pages":"186 - 196"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2017.1403293","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46849786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Chemical activation of hickory and peanut hull hydrochars for removal of lead and methylene blue from aqueous solutions 山胡桃木和花生壳水炭的化学活化去除水溶液中的铅和亚甲基蓝

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1403294

J. Fang, B. Gao, A. Mosa, Lu Zhan

引用次数: 48

Levels, solid-phase fractions and sources of heavy metals at site received industrial effluents: a case study 工业废水中重金属的水平、固相组分和来源:一个案例研究

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1324740

A. Usman, Abdulelah Almutairi, Salem Elmaghraby, A. Al-Farraj

{"title":"Levels, solid-phase fractions and sources of heavy metals at site received industrial effluents: a case study","authors":"A. Usman, Abdulelah Almutairi, Salem Elmaghraby, A. Al-Farraj","doi":"10.1080/09542299.2017.1324740","DOIUrl":"https://doi.org/10.1080/09542299.2017.1324740","url":null,"abstract":"Abstract Heavy metals in the site received industrial effluents were investigated to assess the pollution levels, distribution of metal among solid-phase fractions and possible metal sources. The soil samples at different depths of 0–5, 5–25 and 25–50 cm were collected and analyzed for Fe, Mn, Cd, Zn, Cu, Ni and Pb. Among all metals, Cd content was not detected in all soil samples. The average contents of Pb and Zn are higher than the corresponding values of common range in earth crust. Meanwhile, the maximum contents of Cu and Zn are higher than those of Dutch optimum value but lower that the Dutch protection act target value. The maximum contents of Cu, Pb and Zn are higher than the average shale value. The most investigated heavy metals are mostly found in the potentially labile pool (>50.0%) including metal bound to carbonate, Fe/Mn oxides, or organically fractions. Enrichment factor (EF) in combination with multivariate analysis including principal component analysis (PCA) and hierarchical cluster analysis (HCA) suggest that Mn and Ni associated with Fe in the soil samples were primarily originated from lithogenic sources. Pb was largely derived only from anthropogenic source, while Cu and Zn in the soil samples were controlled by the mixed natural and anthropogenic sources. These results suggest that discharging the industrial effluents into dumping site increased pollution level of Pb, Zn and Cu as well as enhanced their potentially labile pool that may be responsible for occurring potential toxic impacts on environmental quality.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"29 1","pages":"78 - 88"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2017.1324740","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44070465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Total nitrogen and pH-controlled chemical speciation, bioavailability and ecological risk from Cd, Cr, Cu, Pb and Zn in the water level-fluctuating zone sediments of the Three Gorges Reservoir 三峡水库水位波动带沉积物中Cd、Cr、Cu、Pb和Zn的总氮和ph控制化学形态、生物有效性和生态风险

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1335179

Li-ping He, Dan Liu, Jun-jie Lin, Zhi-guo Yu, Xiaoxia Yang, Chuan Fu, Zheng-xue Liu, Qiao-hua Zhao

{"title":"Total nitrogen and pH-controlled chemical speciation, bioavailability and ecological risk from Cd, Cr, Cu, Pb and Zn in the water level-fluctuating zone sediments of the Three Gorges Reservoir","authors":"Li-ping He, Dan Liu, Jun-jie Lin, Zhi-guo Yu, Xiaoxia Yang, Chuan Fu, Zheng-xue Liu, Qiao-hua Zhao","doi":"10.1080/09542299.2017.1335179","DOIUrl":"https://doi.org/10.1080/09542299.2017.1335179","url":null,"abstract":"Abstract We investigated the distribution and chemical speciation of Cd, Cr, Cu, Pb and Zn in the water level-fluctuating (WLF) zone of the main stream (MS) and tributaries (ZX and MX) of the Three Gorges Reservoir. We evaluated the ecological risk and pollution level from heavy metals based on the Potential Ecological Risk Index (RI), Risk Assessment Code (RAC), and Ratio of Secondary Phase and Primary Phase (RSP). Our results indicated that the total and bio-available heavy metal contents were higher in the tributaries than in the MS. Moderate pollution from Cd and light pollution from Pb were observed both at the MS and ZX sites, whereas the MX site exhibited a pattern of heavy Cd pollution and light Cr and Pb pollution. In our study area, the results indicated that Cd exhibited a higher ecological risk than did the other heavy metals. Finally, the pH and nitrogen content of sediments may play a key role in controlling the amount of heavy metal bioavailability, further inducing a higher potential ecological risk.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"29 1","pages":"89 - 96"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2017.1335179","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48714193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Pyrogenic temperature affects the particle size of biochar-supported nanoscaled zero valent iron (nZVI) and its silver removal capacity 生热温度影响生物炭负载纳米零价铁（nZVI）的粒径及其除银能力

Chemical Speciation and Bioavailability Pub Date : 2017-01-01 DOI: 10.1080/09542299.2017.1395712

Shengsen Wang, Mingyue Zhao, Yiting Zhao, Nong Wang, J. Bai, K. Feng, Yanxia Zhou, Wangshu Chen, F. Wen, Saisai Wang, Xiaozhi Wang, Jun Wang

{"title":"Pyrogenic temperature affects the particle size of biochar-supported nanoscaled zero valent iron (nZVI) and its silver removal capacity","authors":"Shengsen Wang, Mingyue Zhao, Yiting Zhao, Nong Wang, J. Bai, K. Feng, Yanxia Zhou, Wangshu Chen, F. Wen, Saisai Wang, Xiaozhi Wang, Jun Wang","doi":"10.1080/09542299.2017.1395712","DOIUrl":"https://doi.org/10.1080/09542299.2017.1395712","url":null,"abstract":"Abstract Particle size of nanoscaled zero valent iron (nZVI) in nanocomposites can be affected by support materials. In this work, nZVI was supported by bamboo-derived biochars produced at 450 °C (BBL) and 600 °C (BBH). Total iron (Fe) contents were 14.4 and 11.9% for nZVI immobilized in BBL (nZVI/BBL) and BBH (nZVI/BBH), respectively. The resultant nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive X-ray analyses (SEM/EDS). The nZVI was successfully embedded in biochar pores and surfaces as confirmed by SEM/EDS and XRD. TEM revealed that particle sizes of nZVI in nZVI/BBL and nZVI/BBH were roughly 26 and 40 nm, respectively. The Ag+ sorption isotherms (25–300 mg L−1 Ag+) suggested that 1 kg of nZVI in nZVI/BBL and nZVI/BBH removed as much as 745.5 and 534.5 g Ag+, respectively. The results suggested that Ag+ removal capacity was related to particle size of nZVI, which was also affected by pyrogenic temperature.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"29 1","pages":"179 - 185"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2017.1395712","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44949266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Feasibility and optimization of wastewater treatment by chemically enhanced primary treatment (CEPT): a case study of Huangshi 化学强化一级处理(CEPT)处理废水的可行性及优化——以黄石市为例

Chemical Speciation and Bioavailability Pub Date : 2016-10-01 DOI: 10.1080/09542299.2016.1247657

Qiulai He, Hongyu Wang, Congyuan Xu, Jing Zhang, Wei Zhang, Zhuocheng Zou, Kai Yang

{"title":"Feasibility and optimization of wastewater treatment by chemically enhanced primary treatment (CEPT): a case study of Huangshi","authors":"Qiulai He, Hongyu Wang, Congyuan Xu, Jing Zhang, Wei Zhang, Zhuocheng Zou, Kai Yang","doi":"10.1080/09542299.2016.1247657","DOIUrl":"https://doi.org/10.1080/09542299.2016.1247657","url":null,"abstract":"Abstract Carbon and nutrients as well as suspended solids (SS) removal by chemically enhanced primary treatment (CEPT) were conducted in the Qingshan wastewater treatment plant in Huangshi, Hubei Province. Feasibility of this process for wastewater treatment were investigated in detail by comparing the removal performance of three inorganic chemical coagulants (polyaluminium chloride, polyaluminium ferric chloride [PAFC] and poly ferric sulfate) individual or couple with poly acrylamide, optimizing the conditions during CEPT by both single factor analysis and orthogonal test designs. The results of this study demonstrated that CEPT turned out to be an effective method for wastewater treatment, with PAFC as the optimal coagulant, which showed preeminent removal capacity for chemical oxygen demand, total phosphorus and SS. The optimal working condition could be at pH 7.0, settling time 15 min, and velocity gradient of 174.80 and 15.56 s−1 for mixing and reaction phase respectively. While the coagulant dosage depends on raw water attributes, which had a decisive effect on CEPT treatment performances. However, the three coagulants behaved poorly in nitrogen removal.","PeriodicalId":55264,"journal":{"name":"Chemical Speciation and Bioavailability","volume":"28 1","pages":"209 - 215"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/09542299.2016.1247657","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60040985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10