A PHP Error was encountered

Severity: Warning

Message: file_get_contents(https://...@gmail.com&api_key=61f08fa0b96a73de8c900d749fcb997acc09): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests

Filename: helpers/my_audit_helper.php

Line Number: 143

Backtrace:

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 143
Function: file_get_contents

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 209
Function: simplexml_load_file_from_url

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3098
Function: getPubMedXML

File: /var/www/html/application/controllers/Detail.php
Line: 574
Function: pubMedSearch_Global

File: /var/www/html/application/controllers/Detail.php
Line: 488
Function: pubMedGetRelatedKeyword

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Attempt to read property "Count" on bool

Filename: helpers/my_audit_helper.php

Line Number: 3100

Backtrace:

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3100
Function: _error_handler

File: /var/www/html/application/controllers/Detail.php
Line: 574
Function: pubMedSearch_Global

File: /var/www/html/application/controllers/Detail.php
Line: 488
Function: pubMedGetRelatedKeyword

File: /var/www/html/index.php
Line: 316
Function: require_once

Catalyzed HO decomposition over iron oxides and oxyhydroxides: Insights from oxygen production and organic degradation. | LitMetric

Catalyzed HO decomposition over iron oxides and oxyhydroxides: Insights from oxygen production and organic degradation.

Chemosphere

School of Environmental Science and Engineering, Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China. Electronic address:

Published: March 2022

AI Article Synopsis

  • Iron minerals like hematite and goethite significantly influence hydrogen peroxide decomposition and reactive oxygen species (ROS) production, making them important for environmental cleanup.
  • The study evaluated six types of iron minerals' effectiveness in decomposing hydrogen peroxide and producing oxygen and found that hematite and goethite are the most efficient for benzoic acid degradation.
  • Some iron minerals, such as ferrihydrite and feroxyhyte, hinder the process because they produce high levels of oxygen but little ROS, highlighting the need for careful selection of minerals in chemical oxidation applications.

Article Abstract

Iron minerals, such as iron oxides and iron oxyhydroxides, are the main influential soil components in catalyzed hydrogen peroxide propagation (CHP). Due to their dual effects on HO activation to produce reactive oxygen species (ROS) and invalid consumption to produce oxygen, the intrinsic reactivity of iron minerals toward HO decomposition requires comprehensive investigations. Herein, six iron minerals (hematite, magnetite, maghemite, goethite, feroxyhyte, and ferrihydrite) for HO decomposition were investigated by a combination of normalized kinetic rate constants of HO decomposition (Nk), O production (Nk), benzoic acid degradation (Nk), and hexachloroethane degradation (Nk) over the surface area of each mineral. The results indicate HO decomposition over iron minerals is a surface-related heterogeneous process. Hematite and goethite are the most promising minerals for environmental cleanup in terms of ROS production, because their HO utilization efficiency for benzoic acid (BA) degradation (0.138 and 0.024 mol BA/mol HO for hematite and goethite, respectively) are highest among the six iron minerals. Magnetite and maghemite are highly active for both HO decomposition and O production at neutral and basic pHs. The presence of organic compounds suppresses O production by more than 60%, which favors HO utilization. Ferrihydrite and feroxyhyte are considered as the problematic mineral for CHP due to that the two minerals acquire a high O production and negligible ROS generation at all pHs. The results of this study provide new insights to increase the understandings of HO-iron mineral systems and guide the application of iron minerals in chemical oxidation technologies.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.chemosphere.2021.133037DOI Listing

Publication Analysis

Top Keywords

iron minerals
24
iron
9
decomposition iron
8
iron oxides
8
minerals
8
magnetite maghemite
8
decomposition production
8
benzoic acid
8
acid degradation
8
hematite goethite
8

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!