In this study, corn stalk was used to synthesize a magnetic adsorbent by pyrolysis together with KHCO as the chemical activator and iron(III) salt as the magnetic reagent. The characterization by scanning electron microscopy, transmission electron microscopy and N adsorption-desorption analysis showed that the magnetic carbon adsorbent had a structure of hierarchical pores with a high specific surface area. To evaluate its adsorption performance, the adsorbent was used for the extraction of carbamates pesticides (propoxur, isoprocarb and fenobucarb) from water and zucchini samples before high-performance liquid chromatography analysis. The result showed that the adsorbent had a good adsorption capability for the analytes. Under the optimized conditions, a good linearity for the analytes existed in the range of 0.1-100.0 ng/mL for water samples and 0.5-100.0 ng/g for zucchini samples with the correlation coefficients of 0.9992-0.9998. The limits of detection for the analytes at a signal to noise ratio of 3 were 0.03 ng/mL for water samples and 0.20-0.50 ng/g for zucchini samples.

In digital printing, the fabric print quality can only be evaluated through the color and pattern of printed fabric after printing. The influence of the physical properties of fabric on the printing effect remains unclear. In this paper, the digital print suitability of cotton fabric was defined, and 14 samples of plain cotton fabrics were taken as research objects. In addition, 11 evaluation indexes of cotton fabrics were selected. The evaluation and prediction model of cotton fabric printability was established by principal component analysis. Furthermore, the prediction results of the model were verified by analyzing the colorimetric data of cotton fabric after printing. The result demonstrated that the evaluation model of printing suitability was applicable and can be used to quickly evaluate the printability of cotton fabrics. Particularly, fabric thickness had the greatest influence on printing permeability. In the case of moderate wicking, the higher the whiteness of cotton fabric, the better the color reproducibility after printing. Additionally, the wicking effect also had a great influence on color performance.

A porous material (polytriphenylamine; PTPA) was synthesized by using triphenylamine as the monomer and dimethoxymethane as the cross-linker. PTPA was characterized by Fourier infrared spectrometry, X-ray diffraction measurements, scanning electron microscopy and N adsorption-desorption isotherms. The PTPA has a spherical-shape morphology and relatively high specific surface area. It is shown to be a viable adsorbent for solid phase extraction of 3-chlorophenol, 2,3-dichlorophenol, 2,4-dichlorophenol and 2,4.6-trichlorophenol prior to their determination by high performance liquid chromatography-mass spectrometry. Under the optimized conditions, recoveries from spiked samples are in the range from 92.5% to 106.3%. The limits of detection range from 0.03 to 0.3 ng mL (at an S/N ratio of 3) in case of bottled juice, and from 0.03 to 0.1 ng g in case of tomato samples. The enrichment factors for the four analytes are in the range of 127-183 for bottle juice, and from 110-150 for tomatos. Response is linear in the range of 1.0 to 40.0 ng mL for juice, and 0.3-40.0 ng g for tomatos. The relative standard deviations for the determination of the chlorophenols at 20 ng mL in bottled beverage, and 20 ng g in tomatos are lower than 5.7%. Graphical abstract A polytriphenylamine polymer (PTPA) was prepared by using an external cross-linker method with triphenylamine as monomer and dimethoxymethane as cross-linker, and it was used as an adsorbent to extract chlorophenols from juice and vegetable samples.

In this study, a porous carbon was prepared by the carbonization of a phthalocyanines‐containing polymer. The carbon material was characterized by using scanning electron microscope, transmission electron microscope, X‐ray diffraction and N2 adsorption–desorption isotherms. The material was used as the solid phase extraction adsorbent for the enrichment of five phenylurea herbicides (monuron, monolinuron, isoproturon, chlortoluron, and buturon) from water and vegetable samples prior to high performance liquid chromatographic analysis. Under the optimized conditions, a good linearity for the analytes existed in the range of 0.1–80.0 ng/mL for water samples, 0.5–80.0 ng/g for white turnip samples, and 0.2–80.0 ng/g for cucumber samples, with determination coefficients of 0.9987–0.9998. The limits of detection for the five analytes at a signal to noise ratio of 3 were 0.01–0.02 ng/mL for water, 0.05–0.10 ng/g for white turnip and 0.03–0.05 ng/g for cucumber. The limits of quantification at the signal to noise ratio of 9 were 0.03–0.06 ng/mL for water, 0.15–0.3 ng/g for white turnip, and 0.1–0.15 ng/g for cucumber.

In the historical road of human mining natural dyes, “plant dyeing” occupies a considerable part. Plant dyes are from nature and used for environmental protection, so they have high development value. In this paper, the dyeing properties of cashmere dyed with gardenia blue pigment were studied. Through orthogonal test and single factor analysis, the effects of pH value, reaction temperature, dye mass fraction and reaction time on color characteristic value and color fastness were investigated. The optimum direct dyeing process of gardenia blue on cashmere fiber was determined as follows: pH value of dye solution is 4.0 – 4.5, dye mass fraction is 7.5% o.w.f, temperature is 75 °C, time is 50mins, bath ratio is 1:30. Direct dyeing and mordant dyeing were used to dye gardenia blue on cashmere fiber. The results show that different blue effects can be dyed by different mordants. When ferrous sulfate was used as mordant, the dyeing depth increased, but the color became gray. When copper sulfate is used as mordant, the dyeing depth increases and the color light changes most obviously due to the influence of copper ions. CLC No: TS 194.1 Document identification code: A