Preparation and characterization of chitosan/purified attapulgite composite for sharp adsorption of humic acid from aqueous solution at low temperature

2017 ◽  
Vol 78 ◽  
pp. 96-103 ◽  
Author(s):  
Nan Sun ◽  
Ying Zhang ◽  
Lixin Ma ◽  
Shuili Yu ◽  
Jinxuan Li
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Low Temperature

scholarly journals Investigations on the mechanism, kinetics and isotherms of ammonium and humic acid co-adsorption at low temperature by 4A-molecular sieves modified from attapulgite

RSC Advances ◽  
2017 ◽  
Vol 7 (28) ◽  
pp. 17095-17106 ◽  
Author(s):  
Nan Sun ◽  
Wenxin Shi ◽  
Lixin Ma ◽  
Shuili Yu
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Humic Acid ◽  
Low Temperature ◽  
Molecular Sieves ◽  
Co Adsorption ◽  
Aluminum Silicate ◽  
Silicate Mineral ◽  
Magnesium Aluminum Silicate ◽  
Kinetics And Isotherms

Attapulgite (ATP) is a type of natural magnesium aluminum silicate mineral and has been applied as an adsorbent to remove organic pollutants and heavy metals in aqueous solution.

Preparation and Characterization of Dendrimer‐Modified Magnetite Nanoparticles for Adsorption of Humic Acid from Aqueous Solution

2020 ◽  
Vol 5 (24) ◽  
pp. 7197-7204
Author(s):  
Somayeh Beiki ◽  
Elham Moniri ◽  
Amir Hessam Hassani ◽  
Homayon Ahmad Panahi
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Magnetite Nanoparticles

scholarly journals Removal of As(III) from Water Using the Adsorptive and Photocatalytic Properties of Humic Acid-Coated Magnetite Nanoparticles

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1604
Author(s):  
Phuong Pham ◽  
Mamun Rashid ◽  
Yong Cai ◽  
Masafumi Yoshinaga ◽  
Dionysios D. Dionysiou ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Excited State ◽  
Humic Acid ◽  
Singlet Oxygen ◽  
Magnetite Nanoparticles ◽  
Formation Rate ◽  
Triplet Excited State ◽  
Strong Adsorption ◽  
Before And After

The oxidation of highly toxic arsenite (As(III)) was studied using humic acid-coated magnetite nanoparticles (HA-MNP) as a photosensitizer. Detailed characterization of the HA-MNP was carried out before and after the photoinduced treatment of As(III) species. Upon irradiation of HA-MNP with 350 nm light, a portion of the As(III) species was oxidized to arsenate (As(V)) and was nearly quantitatively removed from the aqueous solution. The separation of As(III) from the aqueous solution is primarily driven by the strong adsorption of As(III) onto the HA-MNP. As(III) removals of 40–90% were achieved within 60 min depending on the amount of HA-MNP. The generation of reactive oxygen species (•OH and 1O2) and the triplet excited state of HA-MNP (3HA-MNP*) was monitored and quantified during HA-MNP photolysis. The results indicate 3HA-MNP* and/or singlet oxygen (1O2) depending on the reaction conditions are responsible for converting As(III) to less toxic As(V). The formation of 3HA-MNP* was quantified using the electron transfer probe 2,4,6-trimethylphenol (TMP). The formation rate of 3HA-MNP* was 8.0 ± 0.6 × 10−9 M s−1 at the TMP concentration of 50 µM and HA-MNP concentration of 1.0 g L−1. The easy preparation, capacity for triplet excited state and singlet oxygen production, and magnetic separation suggest HA-MNP has potential to be a photosensitizer for the remediation of arsenic (As) and other pollutants susceptible to advanced oxidation.

Characterization of bentonite modified with humic acid for the removal of Cu (II) and 2,4-dichlorophenol from aqueous solution

2016 ◽  
Vol 134 ◽  
pp. 89-94 ◽  
Author(s):  
Xiaoying Jin ◽  
Min Zheng ◽  
Binoy Sarkar ◽  
Ravi Naidu ◽  
Zuliang Chen
Keyword(s):  
Aqueous Solution ◽  
Humic Acid

Characterization of Low Temperature SiNx Films for 3D/2.5D-IC TSV

2015 ◽  
Vol 135 (7) ◽  
pp. 733-738 ◽  
Author(s):  
Yasushi Kobayashi ◽  
Yoshihiro Nakata ◽  
Tomoji Nakamura ◽  
Mayumi B. Takeyama ◽  
Masaru Sato ◽  
...  
Keyword(s):  
Low Temperature

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

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