Synthesis of CuO from CuCO3·Cu(OH)2 and its catalytic activity in the degradation of methylene blue

Xue, Bowen; Qv, Chang; Qian, Zhongwen; Han, Chunyu; Luo, Guangsheng

doi:10.1007/s11164-016-2673-x

Cited by 7 publications

(1 citation statement)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is generally known that carbonate anions (CO 3 2– ) can react with • OH to generate CO 3 •– ( k = 4.2 × 10 8 M –1 s –1 ) . The existing CO 3 2– can also act as an endogenous precipitant to transform Cu(II) into stable copper precipitates, such as Cu(OH) 2 ( K sp = 2.2 × 10 –20 ), CuCO 3 ( K sp = 1.4 × 10 –10 ), CuCO 3 ·Cu(OH) 2 ( K sp = 1.7 × 10 –33 ), and CuO without extra alkali consumption (). − Thus, CO 3 •– -mediated oxidization process is expected to accomplish not only the effective Cu(II)–EDTA decomplexation but also Cu recovery. To date, several studies have reported that the addition of CO 3 2– in the • OH-based oxidation process would affect the decomplexation efficiency of Cu(II)–EDTA. ,, However, the performance and mechanism of Cu(II)–EDTA decomplexation by the attack of CO 3 •– is still unclear. normalC normalu ( I I ) + normalO normalH − → normalC normalu ( O H ) 2 normalC normalu ( I I ) + normalC normalO 3 2 − → normalC normalu normalC normalO 3 normalC normalu ( I I ) + normalC normalO 3 2 − + 2 normalH 2 normalO → normalC normalu 2 ( O H ) …”

Section: Introductionmentioning

confidence: 99%

Targeted Decomplexation of Metal Complexes for Efficient Metal Recovery by Ozone/Percarbonate

Chen

Tian

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Traditional methods cannot efficiently recover Cu from Cu(II)− EDTA wastewater and encounter the formation of secondary contaminants. In this study, an ozone/percarbonate (O 3 /SPC) process was proposed to efficiently decomplex Cu(II)−EDTA and simultaneously recover Cu. The results demonstrate that the O 3 /SPC process achieves 100% recovery of Cu with the corresponding k obs value of 0.103 min −1 compared with the typical • OH-based O 3 /H 2 O 2 process (81.2%, 0.042 min −1 ). The carbonate radical anion (CO 3 •− ) is generated from the O 3 /SPC process and carries out the targeted attack of amino groups of Cu(II)−EDTA for decarboxylation and deamination processes, resulting in successive cleavage of Cu−O and Cu−N bonds. In comparison, the • OH-based O 3 /H 2 O 2 process is predominantly responsible for the breakage of Cu−O bonds via decarboxylation and formic acid removal. Moreover, the released Cu(II) can be transformed into stable copper precipitates by employing an endogenous precipitant (CO 3 2−), accompanied by toxic-free byproducts in the O 3 /SPC process. More importantly, the O 3 /SPC process exhibits excellent metal recovery in the treatment of real copper electroplating wastewater and other metal−EDTA complexes. This study provides a promising technology and opens a new avenue for the efficient decomplexation of metal−organic complexes with simultaneous recovery of valuable metal resources.

show abstract