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In this paper, a fast detection method for pesticide residues was proposed, and the qualitative and quantitative detection of the pesticide could be got at once by the method of solution of multiple linear regression equations which were obtained by dual wavelength absorbance and fluorescence spectrometry with least squares method. Moreover, it could detect two kinds of mixed pesticides. Four selected pesticides, aldicarb, fenitrothion, fenvalerate, and chlorothalonil were detected by the method. The results shown that there were good linear relationship in the range of 0.01-1 ppm, and R2 ＞..read more
Jing Huang, Jincan Lei, Shixian Zhao and Yan Li
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 530
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The surfactant or shape modifier used in the synthesis of monodispersed uniform fine particles affected the performance of the prepared powder in its applications. The present investigation is related to synthesizing colloidal uniform fine particles of nickel oxalate in novel morphologies under an optimized set of reaction conditions without using any surfactant or shape modifier. SEM results revealed that the reactant concentration significantly affected the characteristics of the precipitated solids, which ranged from gel to dispersion of discrete particles. Particles of uniform morphologica..read more
Khalida Akhtar, Ghazala Irum and Muhammad Gul
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 540
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Synthetic dyes in textile effluents cause serious environmental and aquatic life hazards if discharged in water bodies without decolorisation and removal of toxic substances. Efforts have been made to produce composites of Kaolin-CaCO3-TiO2 (K-C-T Composite) using the proportions of 1:1:1, 1:2:1 and 1:1:2 through calcination and assess their potential to remove colour from the effluents of Reactive Black 5 dye. Photocatalytic-composite adsorbent has been characterised for morphological structure, phase determination, band gap and Fourier-transform infrared spectroscopy for colour removal and d..read more
S. Tharakeswari, D. Saravanan, Ashwini K Agrawal and Manjeet Jassal
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 554
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In this study. a locally isolated strain of Bacillus thuringiensis that has insecticidal activity against dengue vector (larvae of Aedes aegypti), was cultivated. Different carbon and nitrogen sources were screened for enhanced bacterial growth. The factors affecting Bacillus thuringiensis’s biomass production like concentration of carbon, nitrogen, pH and temperature were optimized by one parameter at a time technique. The optimal levels of the selected parameters were also obtained by using an Artificial Neural Network (ANN). Peptone and molasses were selected as the best nitrogen and carbon..read more
Farzana Bashir, Yumna Sadef, Iqra Nadeem, Romana Shahzadi, Rubina Nelofer and Muhammad Tariq
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 568
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Based on the previous coordination catalysis theory, the active site on the surface of transition metal oxides can activate the CO2 molecule. Ultrathin two-dimensional (2D) rutile TiO2 nanosheet with (110) crystal face as the main exposed surface has many active sites of Ti3+ and O vacancy, which have some synergistic effects to greatly reduce the dissociation energy of CO2. Following previous assumptions, four possible reduction processes of CO2 on rutile TiO2 (110) surface were systematically assessed by density functional theory (DFT) simulations. The reduction reactions of CO2 along I face..read more
Xuemei Yang and Xiaohua Wang
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 576
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In order to well use waste biomass and realise the quantitative analysis of luteolin, the sorghum straw from the old broom was used to prepare biomass carbon material (CMS-PCSS) through the molten salt carbonization. Then the CMS-PCSS was characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) Raman spectra (Raman), and N2 sorption analysis. In addition, the electrochemical performance of the CMS-PCSS based sensors was examined by electrochemical impedance spectroscopy (EIS) and cyclic voltamme..read more
Youluan Lu, Xinwei Mu, Yaopeng Liu, Zhen Shi, Yin Zheng, Wensheng Huang and Fangming Lou
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 587
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A new series complexes of Ni(II), Mn(II), Co(III), Cu(II), Cr(II), Zn(II), Zr(IV), Cd(II), and La(III) prepared by the reaction of the metal salt with a new Schiff base ligand. This Schiff base obtained by the condensation of p-phenylenediamine, 4-chlorobenzaldehyde, and acetyl acetone. The confirmation of the ligand and its metal complexes were characterized by multiple techniques such as, elemental analyses, magnetic susceptibility studies, FTIR 1H, 13C-NMR, XRD, molar conductance, UV-vis spectral analyses, and thermal analyses. The conductivity measurements of the complexes in DMF solutions..read more
Ahmed N. Alhakimi, Thikra A. Almuhanna. Jawza Sh. Alnawmasi, S. El-Sayed Saeed and Ebtesam H. L. Alhamzi
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 596
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In this work, silver nanoparticles (Ep-AgNPs) were synthesised using Echinacea pallida (Nutt.) Nutt. The dried leaves of E. pallida were collected and heated at 55 °C in deionized water, and filtered, and the leaf extract was treated with AgNO3 to produce the Ep-AgNPs. The Ep-AgNPs were analyzed by Ultraviolet-visible (UV-Vis), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscope (SEM). The characteristic hydroxyl gave the peak at 3147 cm-1. In UV-Vis analysis, observation of absorption band at 468 nm proved the achievement of Ep-AgNPs synthesis. SEM ana..read more
Esma Nur Gecer and Ramazan Erenler
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 610
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In Karachi city presence of elevated concentration of various pollutants from natural and anthropogenic sources has caused the acute shortage of safe drinking water. The physicochemical data of different aquifers of Karachi were examined to elucidate the geochemistry and identify natural and anthropogenic processes controlling the quality of groundwater. Twenty four groundwater samples were collected from different localities of SITE area of Karachi. Physical and chemical characteristics of groundwater were determined using standards methods. Minor and trace metals (Fe, Zn, Co, Cu, Ni, Cr) wer..read more
Aneeq Mahmood Abbasi, Sanober Rafi, Sadaf Naseem and Yusra Rehman
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 618
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This study was conducted to analyze the efficacy of Polyalthia longifolia branches as an effective biosorbent for elimination of textile dye stuff brilliant yellow. Different operating conditions were tested (adsorbent dose, dye concentration, contact time, pH and temperature) to investigate their relationship with adsorption strength of Polyalthia longifolia and subsequently to eliminate toxic color. The absorbent was also characterized by Fourier Transform Infrared (FTIR). Optimum adsorption was observed at pH 6. Model of kinetic explored the adsorption data showing pseudo 2nd order with hig..read more
Sitara Anjum, Sana Ashraf, Sajid Rashid Ahmad, Muhammad Salman and Zahra Majid
- 22 Nov 2022
- Volume Detail: VOLUME 44, NO6, DEC-2022
- Pages: 629
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