Advances in Environmental Research最新文献_第7页

Human exposure of hazardous elements from different urban soils in Bangladesh 人类暴露于孟加拉国不同城市土壤中的有害元素

Advances in Environmental Research Pub Date : 2016-06-25 DOI: 10.12989/AER.2016.5.2.079

M. Islam, M. K. Ahmed, Md. Al-Mamun

引用次数: 7

Semiconductor coupled solar photo-Fenton´s treatment of dyes and textile effluent 半导体耦合太阳能- fenton法处理染料和纺织废水

Advances in Environmental Research Pub Date : 2016-03-25 DOI: 10.12989/AER.2016.5.1.061

Jeevitha R. Raji, K. Palanivelu

{"title":"Semiconductor coupled solar photo-Fenton´s treatment of dyes and textile effluent","authors":"Jeevitha R. Raji, K. Palanivelu","doi":"10.12989/AER.2016.5.1.061","DOIUrl":"https://doi.org/10.12989/AER.2016.5.1.061","url":null,"abstract":". NanoTiO 2 was synthesized by ultrasonication assisted sol-gel process and subjected to iron doping and carbon-iron codoping. The synthesized catalysts were characterized by XRD, HR-SEM, EDX, UV-Vis absorption spectroscopy and BET specific surface area analysis. The average crystallite size of pure TiO 2 was in the range of 30 - 33 nm, and that of Fe-TiO 2 and C-Fe TiO 2 was in the range of 7 - 13 nm respectively. The specific surface area of the iron doped and carbon-iron codoped nanoparticles was around 105 m 2 /g and 91 m 2 /g respectively. The coupled semiconductor photo-Fenton’s activity of the synthesized catalysts was evaluated by the degradation of a cationic dye (C.I. Basic blue 9) and an anionic dye (C.I. Acid orange 52) with concurrent investigation on the operating variables such as pH, catalyst dosage, oxidant concentration and initial pollutant concentration. The most efficient C-Fe codoped catalyst was found to effectively destruct synthetic dyes and potentially treat real textile effluent achieving 93.4% of COD removal under minimal solar intensity (35-40 kiloLUX). This reveals the practical applicability of the process for the treatment of real wastewater in both high and low insolation regimes.","PeriodicalId":7287,"journal":{"name":"Advances in Environmental Research","volume":"69 1","pages":"61-77"},"PeriodicalIF":0.0,"publicationDate":"2016-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79850300","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: 1

Single and mixed chelants-assisted phytoextraction of heavy metals in municipal waste dump soil by castor 蓖麻对城市排土场土壤中重金属的单一和混合螯合剂辅助植物萃取

Advances in Environmental Research Pub Date : 2016-03-25 DOI: 10.12989/AER.2016.5.1.019

R. Wuana, I. Eneji, Julius U. Naku

{"title":"Single and mixed chelants-assisted phytoextraction of heavy metals in municipal waste dump soil by castor","authors":"R. Wuana, I. Eneji, Julius U. Naku","doi":"10.12989/AER.2016.5.1.019","DOIUrl":"https://doi.org/10.12989/AER.2016.5.1.019","url":null,"abstract":". The phytoextraction of some toxic heavy metals from municipal waste dump soil by castor plant (Ricinus communis) was tested under natural and single or mixed chelant-assisted scenarios in pot microcosms. A sandy loam with total metal contents (mg/kg): Cd (84.5), Cu (114.5), Ni (70.3), Pb (57.8), and Zn (117.5), was sampled from an active dumpsite in Calabar, Nigeria and used for the study. Castor (small seed variety) was grown under natural phytoextraction or single/binary chelant (citric acid, oxalic acid, and EDTA) applications (5-20 mmol/kg soil) for 63 days. Castor exhibited no visual phytotoxic symptoms with typically sigmoid growth profiles at the applied chelant doses. Growth rates, however, decelerated with increase in chelant dose. Post-harvest biomass yields were higher under chelant application than for natural phytoextraction. Both root and shoot metal concentrations (mg/kg) increased quasilinearly and significantly ( p ≤ 0.05) with increase in chelant dose, furnishing maximum levels as: Cd (55.6 and 20.9), Cu (89.5 and 58.4), Ni (49.8 and 19.6), Pb (32.1 and 12.1), and Zn (99.5 and 46.6). Ranges of translocation factors, root and shoot bioaccumulation factors were 0.21-3.49, 0.01-0.89 and 0.01-0.51, respectively. Overall, the binary chelant treatments were less toxic for R . communis growth and enhanced metal accumulation in shoots to a greater extent than the single chelant scenarios, but more so when EDTA was present in the binary combination. This suggests that the mixed chelants could be considered as alternative treatments for enhanced phytoextraction and revegetation of degraded waste dump soils.","PeriodicalId":7287,"journal":{"name":"Advances in Environmental Research","volume":"20 3","pages":"19-35"},"PeriodicalIF":0.0,"publicationDate":"2016-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91436822","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: 7

Reduction of nitrate in groundwater by hematite supported bimetallic catalyst 赤铁矿负载双金属催化剂还原地下水中硝酸盐

Advances in Environmental Research Pub Date : 2016-03-25 DOI: 10.12989/AER.2016.5.1.051

S. Hamid, Woojin Lee

引用次数: 8

Alanine and serine functionalized magnetic nano-based particles for sorption of Nd(III) and Yb(III) 丙氨酸和丝氨酸功能化磁性纳米粒子吸附Nd(III)和Yb(III)

Advances in Environmental Research Pub Date : 2016-03-25 DOI: 10.12989/AER.2016.5.1.001

A. Galhoum, M. Mahfouz, A. Atia, N. A. Gomaa, Sayed T. Abdel-Rehem, T. Vincent, E. Guibal

{"title":"Alanine and serine functionalized magnetic nano-based particles for sorption of Nd(III) and Yb(III)","authors":"A. Galhoum, M. Mahfouz, A. Atia, N. A. Gomaa, Sayed T. Abdel-Rehem, T. Vincent, E. Guibal","doi":"10.12989/AER.2016.5.1.001","DOIUrl":"https://doi.org/10.12989/AER.2016.5.1.001","url":null,"abstract":"2016) Abstract. Magnetic nano-based sorbents have been synthesized for the recovery of two rare earth elements (REE: Nd(III) and Yb(III)). The magnetic nano-based particles are synthesized by a one-pot hydrothermal procedure involving co-precipitation under thermal conditions of Fe(III) and Fe(II) salts in the presence of chitosan. The composite magnetic/chitosan material is crosslinked with epichlorohydrin and modified by grafting alanine and serine amine-acids. These materials are tested for the binding of Nd(III) (light REE) and Yb(III) (heavy REE) through the study of pH effect, sorption isotherms, uptake kinetics, metal desorption and sorbent recycling. Sorption isotherms are well fitted by the Langmuir equation: the maximum sorption capacities range between 9 and 18 mg REE g -1 (at pH 5). The sorption mechanism is endothermic (positive value of ∆ H °) and contributes to increase the randomness of the system (positive value of ∆ S °). The fast uptake kinetics can be described by the pseudo-second order rate equation: the equilibrium is reached within 4 hours of contact. The sub-micron size of sorbent particles strongly reduces the contribution of resistance to intraparticle diffusion in the control of uptake kinetics. Metal desorption using acidified thiourea solutions allows maintaining sorption efficiency for at least four successive cycles with limited loss in sorption mL of REE(III) solution at different initial concentrations (i.e., 25, 50, 75, 100, 150, 200 and 300 mg L − 1 , at pH 5) and shaking for 4 h at 300 rpm. The experiments were performed in a thermostatic chamber, at different temperatures (300±1 K, 310±1 K and 320±1 K, respectively). Uptake kinetics was performed using a sorbent dosage of 2.5 g L -1 and a concentration of 100 mg REE L -1 at 300±1 K: samples were collected under agitation at standard times and metal concentration was determined, after magnetic separation, by ICP-AES. Main experimental conditions have been summarized in","PeriodicalId":7287,"journal":{"name":"Advances in Environmental Research","volume":"32 1","pages":"1-18"},"PeriodicalIF":0.0,"publicationDate":"2016-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87230816","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

Optimization of methylene blue adsorption by pumice powder 浮石粉吸附亚甲基蓝的优化

Advances in Environmental Research Pub Date : 2016-03-01 DOI: 10.12989/AER.2016.5.1.037

D. Çifçi, S. Meriç

引用次数: 10

The prediction of atmospheric concentrations of toluene using artificial neural network methods in Tehran 利用人工神经网络方法预测德黑兰大气中甲苯的浓度

Advances in Environmental Research Pub Date : 2015-12-25 DOI: 10.12989/AER.2015.4.4.219

G. Asadollahfardi, Shiva Homayoun Aria, M. Mehdinejad

{"title":"The prediction of atmospheric concentrations of toluene using artificial neural network methods in Tehran","authors":"G. Asadollahfardi, Shiva Homayoun Aria, M. Mehdinejad","doi":"10.12989/AER.2015.4.4.219","DOIUrl":"https://doi.org/10.12989/AER.2015.4.4.219","url":null,"abstract":"In recent years, raising air pollutants has become as a big concern, especially in metropolitan cities such as Tehran. Therefore, forecasting the level of pollutants plays a significant role in air quality management. One of the forecasting tools that can be used is an artificial neural network which is able to model the complicated process of air pollution. In this study, we applied two different methods of artificial neural networks, the Multilayer Perceptron (MLP) and Radial Basis Function (RBF), to predict the hourly air concentrations of toluene in Tehran. Hourly temperature, wind speed, humidity and NOx were selected as inputs. Both methods had acceptable results; however, the RBF neural network produced better results. The coefficient of determination (R 2 ) between the observed and predicted data was 0.9642 and 0.99 for MLP and RBF neural networks, respectively. The results of the mean bias errors (MBE) were 0.00 and -0.014 for RBF and MLP, respectively which indicate the adequacy of the models. The index of agreement (IA) between the observed and predicted data was 0.999 and 0.994 in the RBF and the MLP, respectively which indicates the efficiency of the models. Finally, sensitivity analysis related to the MLP neural network determined that temperature was the most significant factor in air concentration of toluene in Tehran which may be due to the volatile nature of toluene.","PeriodicalId":7287,"journal":{"name":"Advances in Environmental Research","volume":"298 1","pages":"219-231"},"PeriodicalIF":0.0,"publicationDate":"2015-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74382746","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: 1

Air pollution study using factor analysis and univariate Box-Jenkins modeling for the northwest of Tehran 利用因子分析和单变量Box-Jenkins模型对德黑兰西北部的空气污染进行研究

Advances in Environmental Research Pub Date : 2015-12-25 DOI: 10.12989/AER.2015.4.4.233

G. Asadollahfardi, M. Zamanian, M. Mirmohammadi, M. Asadi, Fatemeh Izadi Tameh

{"title":"Air pollution study using factor analysis and univariate Box-Jenkins modeling for the northwest of Tehran","authors":"G. Asadollahfardi, M. Zamanian, M. Mirmohammadi, M. Asadi, Fatemeh Izadi Tameh","doi":"10.12989/AER.2015.4.4.233","DOIUrl":"https://doi.org/10.12989/AER.2015.4.4.233","url":null,"abstract":"High amounts of air pollution in crowded urban areas are always considered as one of the major environmental challenges especially in developing countries. Despite the errors in air pollution prediction, the forecasting of future data helps air quality management make decisions promptly and properly. We studied the air quality of the Aqdasiyeh location in Tehran using factor analysis and the Box-Jenkins time series methods. The Air Quality Control Company (AQCC) of the Municipality of Tehran monitors seven daily air quality parameters, including carbon monoxide (CO), Nitrogen Monoxide (NO), Nitrogen dioxide (NO2), NOX, ozone (O3), particulate matter (PM10) and sulfur dioxide (SO2). We applied the AQCC data for our study. According to the results of the factor analysis, the air quality parameters were divided into two factors. The first factor included CO, NO2, NO, NOx, and O3, and the second was SO2 and PM10. Subsequently, the BoxJenkins time series was applied to the two mentioned factors. The results of the statistical testing and comparison of the factor data with the predicted data indicated Auto Regressive Integrated Moving Average (0, 0, 1) was appropriate for the first factor, and ARIMA (1, 0, 1) was proper for the second one. The coefficient of determination between the factor data and the predicted data for both models were 0.98 and 0.983 which may indicate the accuracy of the models. The application of these methods could be beneficial for the reduction of developing numbers of mathematical modeling.","PeriodicalId":7287,"journal":{"name":"Advances in Environmental Research","volume":"34 1","pages":"233-246"},"PeriodicalIF":0.0,"publicationDate":"2015-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78742837","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: 4

Nitrate reduction by iron supported bimetallic catalyst in low and high nitrogen regimes 铁负载双金属催化剂在低氮和高氮条件下还原硝酸盐

Advances in Environmental Research Pub Date : 2015-12-25 DOI: 10.12989/AER.2015.4.4.263

S. Hamid, Woojin Lee

引用次数: 6

Lignin signatures of vegetation and soils in tropical environments 热带环境中植被和土壤的木质素特征

Advances in Environmental Research Pub Date : 2015-12-25 DOI: 10.12989/AER.2015.4.4.247

Émilie Bélanger, M. Lucotte, B. Grégoire, M. Moingt, S. Paquet, R. Davidson, F. Mertens, C. Passos, C. Romaña

{"title":"Lignin signatures of vegetation and soils in tropical environments","authors":"Émilie Bélanger, M. Lucotte, B. Grégoire, M. Moingt, S. Paquet, R. Davidson, F. Mertens, C. Passos, C. Romaña","doi":"10.12989/AER.2015.4.4.247","DOIUrl":"https://doi.org/10.12989/AER.2015.4.4.247","url":null,"abstract":". The few lignin biomarker studies conducted in tropical environments are hampered by having to use references signatures established for plants and soils characteristic of the temperate zone. This study presents a lignin biomarker analysis (vanillyls (V), p-hydroxyls (P), syringyls (S), cinnamyls (C)) of the dominant plant species and soil horizons as well as an analysis of the interrelated terrigenous organic matter (TOM) dynamics between vegetation and soil of the Tapajós river region, an active colonization front in the Brazilian Amazon. We collected and analyzed samples from 17 fresh dominant plant species and 48 soil cores at three depths (0-5 cm, 20-25 cm, 50-55 cm) from primary rainforest, fallow forest, subsistence agriculture fields and pastures. Lignin signatures in tropical plants clearly distinguish from temperate ones with high ratios of Acid/aldehyde of vanillyls ((Ad/Al)v) and P/V+S. Contrary to temperate environments, similarly high ratios in tropical soils are not related to TOM degradation along with pedogenesis but to direct influence of plants growing on them. Lignin signatures of both plants and soils of primary rainforest and fallow forest clearly distinguish from those of non-forested areas, i.e., agriculture fields and pastures. Attalea speciosa Palm trees, an invasive species in all perturbed landscapes of the Amazon, exhibit lignin signatures clearly distinct from other dominant plant species. The study of lignin signatures in tropical areas thus represents a powerful tool to evaluate the impact of primary rainforest clearing on TOM dynamics in tropical areas.","PeriodicalId":7287,"journal":{"name":"Advances in Environmental Research","volume":"52 1","pages":"247-262"},"PeriodicalIF":0.0,"publicationDate":"2015-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80369122","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: 6