Carboxymethyl cellulose stabilized ZnO/biochar nanocomposites: Enhanced adsorption and inhibited photocatalytic degradation of methylene blue

被引：74

作者：

Wang, Shengsen ^{[1
,2
,3
]}

Zhou, Yanxia ^{[1
]}

Han, Shuwen ^{[1
]}

Wang, Nong ^{[3
]}

Yin, Weiqin ^{[1
]}

Yin, Xianqiang ^{[4
]}

Gao, Bin ^{[5
]}

Wang, Xiaozhi ^{[1
]}

Wang, Jun ^{[6
]}

机构：

[1] Yangzhou Univ, Coll Environm Sci & Engn, Yangzhou 225127, Jiangsu, Peoples R China

[2] Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou, Guangdong, Peoples R China

[3] Minist Agr, Tianjin Key Lab Agroenvironm & Safe Prod, Key Lab Original Agroenvironm Pollut Prevent & Co, Tianjin 300191, Peoples R China

[4] Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Peoples R China

[5] Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA

[6] Shandong Agr Univ, Key Lab Agr Environm Univ Shandong, Coll Resources & Environm, Tai An 271018, Shandong, Peoples R China

来源：

CHEMOSPHERE | 2018年 / 197卷

基金：

中国国家自然科学基金;

关键词：

Sodium carboxymethyl cellulose; Nanoscaled zinc oxide; Methylene blue; Sorption; Degradation; Hydroxyl radical; REMOVAL; BIOCHAR; ANTIOXIDANT; HYDROGEL; CR(VI); PB(II); SIZE;

D O I：

10.1016/j.chemosphere.2018.01.022

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Biochar(BC)-supported nanoscaled zinc oxide (nZO) was encapsulated either with (nZORc/BC) or with no (nZOR/BC) sodium carboxymethyl cellulose (CMC). The X-ray diffraction and ultraviolet (UV)-visible-near infrared spectrophotometry revealed that nZO of 16, 10, and 20 nm with energy band gaps of 2.79, 3.68 and 2.62 eV were synthesized for nZOR/BC, nZORc/BC and nZO/BC, respectively. The Langmuir isotherm predicted saturated sorption of methylene blue (MB) was 17.01 g kg(-1) for nZORc/BC, over 19 times greater than nZOR/BC and nZO/BC. Under UV irradiation, 10.9, 61.6, 83.1, and 41.6% of MB were degraded for nZORc/BC, nZO/BC, nZOR/BC and BC. The scavenging experiment revealed hydroxyl radical dominated CMC degradation. Exogenous CMC (2 g L-1) increased MB sorption from 10.6% to 73.1%, but decreased MB degradation from 80.7% to 41.1%, relative to nZOR/BC. Thus, CMC could increase MB sorption by electrostatic attraction and other possible mechanisms. The compromised MB degradation may be ascribed to reduced availability of hydroxyl and superoxide radicals to degrade MB, and increased band gap energy of ZnO. (C) 2018 Published by Elsevier Ltd.

引用

页码：20 / 25

页数：6