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4 protocols using calcium hydroxide

1

Fly Ash Waste Utilization Protocol

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Sodium hydroxide (NaOH), calcium hydroxide (Ca(OH)2), copper chloride dishydrate (CuCl2·2H2O), ethanol, hydrochloric acid are all analytical grade, purchased from Sinopharm Chemical Reagent Co., Ltd. Acumer2000 solution (Mw = 4500, solid content 43%, density 1.21 g mL−1, pH = 4) was purchased from Rohm & Hass company. The raw fly ash was obtained as waste from a power plant in Jiaxing city, Zhejiang province, China. All chemicals have been used without further purification. The water used in this work is deionized water.
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2

Colorimetric Analysis of Pyrene

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Pyrene (97%), oleum (50%), nitrobenzene (AR), calcium hydroxide (AR), sodium carbonate (AR), n-butanol (AR), sodium chloride (AR), chitosan and hydroxyethyl cellulose (HEC) were purchased from Sinopharm Chemical Reagent Co., Ltd and used as received. DISPercoll U54 was obtained from Bayer Co., Ltd and WPU-538 purchased from Jitian Chemical Reagent Co., Ltd. Pigments (red, green and blue) and the non-background paper free of fluorescer and other colours (210 × 297 mm, 95 g m−2) were purchased from commerce. Deionized water was used during the experiment.
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3

Synthetic Wastewater Treatment Protocol

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4-Methyl-octylphenol, 4-tert-butyl-octylphenol, 4-tert-octylphenol, chloroacetic acid, dimethyl sulfoxide (DMSO) and NaOH were purchased from Chendu Xiya Reagent Chemical Technology Co., Ltd. Concentrated hydrochloric acid, oxalic acid, calcium hydroxide, sodium phosphate, ammonium chloride, calcium sulfate and magnesium sulfate were purchased from Sino-pharm Chemical Reagent Co., Ltd., China. All other chemicals were used without further purification.
Real wastewater sample was collected from the RE industry in Inner Mongolia, China. The typical compositions of the wastewater are listed as follows, CaSO4 0.0113 mol L−1, MgSO4 0.124 mol L−1 and (NH4)2SO4 0.325 mol L−1. In order to reduce the influence of impurities, the synthetic wastewater samples containing CaSO4, MgSO4 and (NH4)2SO4 were prepared and used in the parts of mechanism research.
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4

Characterization of Sophora japonica Extracts

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The different metal salts (AR) were provided by the Nanjing Reagent Co., Ltd. Methyl alcohol (HPLC) was produced by Tedia Company, Inc. R was extracted from Sophora japonica acquired from Bozhou Good health Food Co., Ltd. 2-Hydroxypropyl-β-cyclodextrin was purchased from Aladdin Reagent Co., Ltd. Next, phosphate buffer solution (PBS, pH = 7.40) were obtained from Beijing Solarbio Science & Technology Co., Ltd. Finally, sodium tetraborate, hydrochloric acid and calcium hydroxide were purchased by Sinopharm Chemical Reagent Co., Ltd. It is important to note that all solutions involving the above mentioned reagents were prepared freshly using ultrapure water produced by Milli-Q.
Fluorescence spectra and UV-visible absorption spectra were recorded on a PerkinElmer LS55 spectrophotometer and a Lambda 950 spectrophotometer, respectively. All 1H NMR spectra were obtained via a Bruker AVANCE III HD 600 MHz spectrometer. Finally, FT-IR spectra were obtained by way of a Bruker VERTEX 80V.
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