Removal of p-arsanilic acid and phenylarsonic acid from water by Fenton coagulation process: influence of substituted amino group

2021 ◽  
Author(s):  
Qiang Peng ◽  
Wenze Xu ◽  
Weixiao Qi ◽  
Chengzhi Hu ◽  
Huijuan Liu ◽  
...  
Keyword(s):  
Amino Group ◽  
Arsanilic Acid ◽  
Coagulation Process ◽  
Phenylarsonic Acid

Removal of p-arsanilic acid and phenylarsonic acid from water by Fenton-coagulation process: influence of substituted amino group

2021 ◽  
Author(s):  
Qiang Peng ◽  
Wenze Xu ◽  
Weixiao Qi ◽  
Chengzhi Hu ◽  
Huijuan Liu ◽  
...  
Keyword(s):  
Emerging Contaminants ◽  
Ph Value ◽  
Inorganic Arsenic ◽  
Amino Group ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Arsanilic Acid ◽  
Coagulation Process ◽  
Coagulation Performance ◽  
Phenylarsonic Acid

Abstract Phenylarsonic acid compounds, which were widely used in poultry and swine production, are emerging contaminants due to their considerable solubility in water and the highly toxic inorganic arsenic species forming potential during their biotic and abiotic degradation in the natural environment. Herein, we investigated the optimal conditions to treat typical organoarsenic contaminants ( p -arsanilic acid ( p -ASA) and phenylarsonic acid (PAA)) in aqueous solution based on Fenton-coagulation process for oxidizing them and capturing the released inorganic arsenic, and elucidated the influence mechanism of substituted amino group on removal. Results showed that the pH value and the dosage of H 2 O 2 and Fe 2+ significantly influenced the performance of the oxidation and coagulation processes. The optimal conditions for removing 20mg L -1 -As in this research were: 40mg L -1 Fe 2+ and 60mg L -1 H 2 O 2 (the mass ratio of Fe 2+ /H 2 O 2 = 1.5), initial solution pH of 3.0 and final solution pH of 5.0 adjusting after 30 min Fenton oxidation reaction. Meanwhile, the substituted amino group observably influence the oxidation and coagulation performance of phenylarsonic acid compounds. Amino group could make phenylarsonic acid compounds more easily be attacked by ·HO and supply more binding sites for forming complexes with Fe 3+ hydrolysates, resulting in higher oxidation rate and better coagulation performance.

Identification of degradation products of phenylarsonic acid and o-arsanilic acid in contact with suspensions of soils of volcanic origin

Talanta ◽  
2012 ◽  
Vol 99 ◽  
pp. 310-315 ◽  
Author(s):  
Uriel Arroyo-Abad ◽  
Jürgen Mattusch ◽  
Monika Möder ◽  
Maria P. Elizalde-González ◽  
Frank-Michael Matysik
Keyword(s):  
Degradation Products ◽  
Volcanic Origin ◽  
Arsanilic Acid ◽  
Phenylarsonic Acid

scholarly journals Affinity-chromatography purification of alkaline phosphatase from calf intestine

1975 ◽  
Vol 151 (2) ◽  
pp. 291-296 ◽  
Author(s):  
O Brenna ◽  
M Perrella ◽  
M Pace ◽  
P G Pietta
Keyword(s):  
Alkaline Phosphatase ◽  
Affinity Chromatography ◽  
Specific Activity ◽  
Diazonium Salt ◽  
Competitive Inhibitor ◽  
Affinity Column ◽  
Arsanilic Acid ◽  
Nitrophenyl Phosphate ◽  
Derivatives Of ◽  
Phenylarsonic Acid

A crude preparation of alkaline phosphatase (EC 3.1.3.1) from calf intestinal mucosa was purified by affinity chromatography on Sepharose-bound derivatives of arsanilic acid, which was found to be a competitive inhibitor of the enzyme. Three biospecific adsorbents were prepared for the chromatography, and the best results were obtained with a tyraminyl-Sepharose derivative coupled with the diazonium salt derived from 4-(p-aminophenylazo)phenylarsonic acid. Alkaline phosphatase was the only enzyme retained by the affinity column in the absence of Pi. The enzyme eluted by phosphate buffer had a specific activity of about 1200 units per mg of protein at pH 10.0, with 5.5mM-p-nitrophenyl phosphate as the substrate.

Synthesis and properties of some gelatin derivatives with substituents at the amino group

1965 ◽  
Vol 15 (10) ◽  
pp. 479-488
Author(s):  
R. C. Clark ◽  
W. G. Cobbett ◽  
J. A. Gibbs ◽  
R. T. Jones ◽  
A. A. Leach ◽  
...  
Keyword(s):  
Amino Group

Arsanilic Acid as a Therapeutic and Prophylactic Agent for Hemorrhagic Dysentery

1961 ◽  
Vol 20 (4) ◽  
pp. 768-773 ◽  
Author(s):  
I. D. Smith ◽  
E. M. Kiggins ◽  
H. S. Perdue ◽  
J. C. Holper ◽  
D. V. Frost
Keyword(s):  
Prophylactic Agent ◽  
Arsanilic Acid

Control of coagulation process by dual wavelength article analyzer

1997 ◽  
Vol 36 (4) ◽  
pp. 135-142 ◽  
Author(s):  
Norihito Tambo ◽  
Yoshihiko Matsui ◽  
Ken-ichi Kurotani ◽  
Masakazu Kubota ◽  
Hirohide Akiyama ◽  
...  
Keyword(s):  
Water Quality ◽  
Control System ◽  
Predictive Control ◽  
Control Method ◽  
Feedforward Control ◽  
Raw Water ◽  
Floc Size ◽  
Coagulation Process ◽  
Series Of Experiments ◽  
Size Data

A coagulation process for water purification plants mainly uses feedforward control based on raw water quality and empirical data and requires operator's help. We developed a new floc sensor for measuring floc size in a flush mixer to be used for floc control. A control system using model predictive control was developed on the floc size data. A series of experiments was performed to confirm controllability of settled water quality by controlling flush mixer floc size. An automatic control with feedback from the coagulation process was evaluated as practical and reliable. Finally this new control method was applied for actual plant and evaluated as practical.

Aminocoumarins: A Privileged Precursor for the Synthesis of Fused Heterocycles

2019 ◽  
Vol 23 (9) ◽  
pp. 1045-1075 ◽  
Author(s):  
Saigal ◽  
Sumbulunnisan Shareef ◽  
Habibur Rahman ◽  
Md. Musawwer Khan
Keyword(s):  
Chemical Reactivity ◽  
Structural Systems ◽  
Natural Occurrence ◽  
Amino Group ◽  
Active Compounds ◽  
The Past ◽  
Fused Heterocycles

Aminocoumarins are one of the important core structural systems, present in several biologically and medicinally active compounds. Owing to its natural occurrence, potential pharmacological applications and remarkable versatility as a privileged precursor, several proficient synthetic protocols have been reported in the literature over the past years. The presence of an amino group and enamine carbon enhances its chemical reactivity and thus such functionality is repeatedly used for the construction of various fused and simple heterocycles. This review highlights the preparation of different aminocoumarins and their applications for the construction of a variety of five, six and eight membered fused heterocycles.

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