Analytical Methods in Environmental Chemistry Journal

In the present work a multifunctional nanoadsorbent was synthesized via a well-designed stepwise route, led to the grafting of an amine group on the interior and acidic sites on the exterior of bimodal mesoporous silica nanoparticles (UVM-7). First, amine and thiol groups were grafted on the interior and exterior pores of silica through co-condensation and post synthesis treatment, respectively. Then, the oxidation of thiol on UVM-7 caused to create sulfonic acid and the subsequent template extraction was carried out to obtain the NH2/UVM-7/SO3H. The results of XRD, the nitrogen sorption, SEM, TEM, FT-IR and elemental analysis revealed the presence of both types of functional groups on UVM-7. Then, simultaneous adsorption of anionic and cationic dyes (Methylene Blue [MB] and Direct Red 23 [Dr]) using NH2/UVM-7/SO3H was investigated. UV-Vis spectrophotometry was utilized for the determination of dyes in single and binary solutions. Langmuir and Freundlich models were used for the fitting of obtained experimental adsorption data and the constants of both isotherms were calculated for MB and Dr. Morover, the calculation of thermodynamic parameters revealed that the adsorption of MB and Dr on NH2/UVM-7/SO3H was endothermic and spontaneous.

Amir Vahid

Majid Abdouss

Shahnaz Nayeri

Aliakbar Miran Beigi

Simultaneous adsorption of cationic and anionic dyes using a novel multifunctional mesoporous silica

新型多功能介孔二氧化硅对阳离子和阴离子染料的同时吸附

In recent decades, large amount of pollutants enter to the environment due to development of technology. Therefore it is necessary to use ecofriendly sorbent to eliminate pollutants. In this research, an dried activated sludge (DAS) was used to decrease Se(IV) pollutant and the effect of operating parameters such as solution pH, the amount of biosorbent, contact time, temperature and initial concentration of selenium were studied. Kinetic data was adjusted to the Langmuir and Freundlich kinetic equations. It was resulted that the Freundlich equation with a correlation coefficient of 0.9956 has the Best match to tetravalent selenium biosorption on DAS. The FT-IR results showed that the biosorption mechanism of selenium tetravalent metal ion on DAS is because of the existence of functional groups on the DAS surface can interact with Se(IV) ions. This study aims to investigate the biosorption capacity of the DAS for tetravalent selenium ions in aqueous solutions. &nbsp

Mahdiyeh Ghazizadeh

Abdollah Abbasloo

Farzaneh Bivar

Speciation and removal of selenium (IV, VI) from water and wastewaters based on dried activated sludge before determination by flame atomic absorption spectrometry

基于干燥活性污泥的水和废水中硒（IV，VI）的形态分析与去除，采用火焰原子吸收光谱法测定前处理

Microbial fuel cells (MFCs) are a green and efficient approach to treat wastewater and generate energy. According to the present research, a novel MFC fabricate based on graphite rod electrodes (GRE). The surface of this cathode was modified with iron-functionalized ZSM-5 nanozeolite. The characterization of Iron doping in nanozeolite structure and electrode surface modification were obtained by XRD and EDX analyzes, respectively. Chemical analysis of square wave (Sqw) and cyclic voltammetry (CV) determined for all of three graphite electrodes (G, G-Z and G-Z/Fe) with higher efficiency. Morover, the comparison of experimental results from 72-hour fuel cell steering was evaluated and showed that the G-Z/Fe graphite electrodes has maximum efficiency and effectiveness. Thus, the efficiency of fuel cell output current and residual chemical oxygen demand removal with this electrode increased up to 21.8% and 36.9%, respectively. The effiucient recovery for the modification of the graphite electrode was achieved due to increasing of the specific surface area, the active sites of functionalized nanozeolite and the elevation in the electrical conductivity through the presence of iron particles doped in the ZSM-5/Fe nanocatalyst structure. Therefore, the G-Z/Fe cathode can be used as a favorite electrode for the construction of MFCs based on GRE .

Mostafa Hassani

Mohsen Zeeb

Amirhossein Monzavi

Zahra Khodadadi

Mohammad Reza Kalaee

Novel graphite rod electrode modified with iron-functionalized nanozeolite for efficient wastewater treatment by microbial fuel cells

铁功能化纳米沸石改性石墨棒电极在微生物燃料电池中高效废水处理的新方法

Zinc oxide (ZnO) nanoparticles with an average size of 60 nm have been successfully prepared by microwave irradiation. Carbon paste electrode (CPE) was modified with ZnO nanoparticles and used for the electrochemical oxidation of chlorpheniramine maleate (CPM). Cyclic voltammetry (CV) study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 106 mV and the peak current was enhanced by 2 fold in comparison to the bare CPE (ZnO/CPE-CV). The electrochemical behaviour was further described by characterization studies of scan rate, pH and concentration of CPM. Under the optimal conditions, the peak current was proportional to CPM concentration in the range of 8.0 ×10-7 to 1.0 × 10-3 mol L-1 with a detection limit of 5.0 × 10-7 mol L-1 by differential pulse voltammetry (DPV). The peak current of CPM is linear in the concentration range of 0.8 - 1000 µM (R2=0.998). The ZnO/CPE has good reproducibility and high stability for the determination of CPM using this electrode. The proposed method was successfully applied to the determination of CPM in pharmaceutical samples. In addition, the important analytical parameters were compared with other methods which show that ZnO/CPE-CV procedure is comparable to recently reported methods.

Hamideh asadollahzadeh

Developing an electrochemical sensor based on a carbon paste electrode modified with ZnO nanoparticles synthesized by microwave for determination of chlorpheniramine maleate

开发基于微波合成ZnO纳米颗粒修饰碳糊电极的氯苯那敏马来酸盐电化学传感器

In this study, the mixture of nano activated carbon (NAC) and ionic liquid (3-triphenylphosphonio-propane-1-sulfonate; C21H21O3PS) was coated on fused silica fiber of SPME holder (NAC-IL-FSF/SPME). Then NAC/IL was used for determining of benzene in soil and vegetables samples (1.0 g, n=50) surrounding a chemical industry zone. After benzene adsorption on NAC-IL based on head space solid phase micoextraction (HS-SPME), the concentration of benzene was simply determined by introducing probe to injector of gas chromatography with flame-ionization detection (GC-FID). All effected parameters such as the sorbent mass, the amount of sample, the temperature, and the interaction time were optimized in glass chromatography vials by static procedures. The benzene vapor was absorbed from soil and vegetables samples with NAC-IL-FSF/SPME holder for 10 min at 80oC (10 mg of NAC and 0.1 g of ionic liquid in 0.5 mL of acetone coated on FSF). Then the benzene was desorbed and determined by GC-FID spectrometry. The extraction efficiency and absorption capacity of adsorbent were obtained 98.5% and 127.2 mg g-1, respectively. The high surface area of NAC and favorite interaction of aromatic chain in IL (π-π), caused to efficiently remove of benzene vapor by HS-SPME procedure as compared to other nanostructures.

Afsaneh Afzali

Hossein Vahidi

Saeed Fakhraie

Benzene extraction in environmental samples based on the mixture of nanoactivated carbon and ionic liquid coated on fused silica fiber before determination by headspace solid-phase microextraction-gas chromatography

基于纳米活性炭与离子液体混合物涂覆熔融石英纤维的苯提取方法在环境样品中的应用及顶空固相微萃取-气相色谱测定前的研究

Geetu Gambhir

Bioanalytical Method: Determining pesticide residues in tomatoes and mushrooms by a bioactive membrane-based sensor, enzyme inhibition and UV-Vis Spectrophotometry

生物分析方法：基于生物活性膜传感器、酶抑制和紫外-可见分光光度法测定番茄和蘑菇中的农药残留

Ismaeil Alizadeh

Determination and evaluation of pesticide residues in vegetables using gas chromatography-mass spectrometry

气相色谱-质谱法测定和评价蔬菜中农药残留

This study aims to use dolomite to remove Zn2+ and Cu2+ from wastewater. The adsorption process of the Zn2+ and Cu2+ was performed using the batch method at various factors (such as the amount of adsorbent, contact time, particle size, pH media, temperature, and initial concentration) to investigate the optimum removal conditions. The flame atomic absorption spectroscopy (F-AAS) was used to determine Zn2+ and Cu2+ after removal steps. The LOD of Zn2+ and Cu2+ were 0.05 mg L-1 and 0.08 mg L-1, respectively. Results showed that the adsorbent dolomite efficiently removed Zn2+ and Cu2+ with up to 98 % when 0.4 g of dolomite was used. The smaller dolomite particle size had higher removal efficiency for Zn2+ and Cu2+ ions. The results showed the removal of Zn2+ and Cu2+ was the maximum in the basic medium. Also, the removal of ions reached the maximum when dolomite had been in contact for 30 minutes with the wastewater. The experimental results of Langmuir and Freundlich adsorption isotherms show linearity where R2 is more than (0.998 and 0.978) and (0.9915 and 0.9996) for Zn2+ and Cu2+, respectively. The qmax was obtained at 91.74 mg g-1 for Cu2+ and 44.24 mg g-1 for Zn2+.

Firas Fadhel Ali

Ahmed S. Al-Rawi

Abdulsalam M. Aljumialy

Mohammed Oday Ezzat

Dolomite utilization for removal of Zn2+ and Cu2+ ions from wastewater before determination by flame atomic absorption spectroscopy

利用白云石去除废水中的Zn2+和Cu2+离子，再通过火焰原子吸收光谱法测定

The present study aims to characterize the direct UV-Vis spectrophotometric analysis of hexavalent chromium (CrVI) in aqueous solution. The effects of pH and the presence of different ions are evaluated. The results obtained show that at pH ≤ 6, Cr(VI) analysis must be carried out at 350 nm. The Beer-Lambert law is respected for a concentration lower than 100mg Cr(VI) L-1. At pH ≥ 8, the analysis must be performed at 372 nm. In this case, the linearity range of the standard curve does not exceed the concentration of 25 mg Cr(VI) L-1. In the pH range 6 &lt;pH &lt; 8, the direct Cr(VI) analysis cannot be performed. Whatever the pH of the solutions, the presence of acetate, oxalate, citrate, and tartrate with a concentration ten times higher than that of Cr(VI), has no effect. At pH 2, only the presence of Fe(II) and Fe(III) ions prevents the direct determination of Cr(VI) ions. In the presence of metallic ions [Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II)), Cr(VI)] analysis must be carried out at pH 2. At higher pH, these ions have a significant effect.

Rayane Nadjet Fassi

Chahrazed Boukhalfa

Direct analysis of hexavalent chromium in water samples by UV-Vis spectrophotometry: Effects of pH and the presence of foreign ions

紫外-可见分光光度法直接分析水样中六价铬：pH值及外来离子的影响

The adsorption of methylene blue dye on modified mesoporous silica based on palm oil boiler ash (MS-POBA) as an adsorbent with a methyl ester sulfonate (MES) was investigated. MS-POBA and MES as a template improved the adsorption capacity of methylene blue by increasing the pore size of boiler ash silica. The characteristics of the material were determined using FTIR, XRD, BET, and SEM-EDX analyzers. The adsorption of methylene blue on the MS-POBA adsorbent was determined using a UV-Vis spectrophotometer. The MES as a template pasted to MS-POBA, could be increased surface area, pore diameter, and volume. In optimized conditions, pH, the adsorbent mass, the adsorption time, the methylene blue concentration, the adsorption capacity, and recovery were obtained at 7.0, 0.03 g, 45 minutes, 20 mg L–1, 15.578 mg g–1, and 96.9%, respectively. The adsorption of methylene blue on boiler ash silica with an MES template follows the pseudo-second-order kinetic model with a value of R2 = 0.999 and Langmuir isotherm adsorption model.

Shinta Ayu Kusumaningtyas

Dwi Siswanta

Adhitasari Suratman

Adsorption of methylene blue into modified mesoporous silica from palm oil boiler ash before determination by UV-Vis spectrophotometer

甲基蓝在紫外-可见分光光度计测定前对改性中孔二氧化硅的吸附研究：来自棕榈油锅炉灰的吸附剂

ISSN	2645-5382, 2645-5552
h-index	11

Publication Information	Publisher: AMEC Publisher，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2018，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:

Analytical Methods in Environmental Chemistry Journal

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