Table 2 Measurements of oily wastewater COD before/after treatment with Janus HGMPs.

From: Preparation of asymmetric Janus hollow silica microparticle and its application on oily wastewaters

Samples

pH

Total NH3 + N

COD

Remove rate of COD

Oily wastewater 100 mL

6.96

12.03

236

–

Oily wastewater 100 mL + J-HGMPs, 0.125 g

7.16

9.16

196

16.9%

Oily wastewater 200 mL + J-HGMPs, 0.250 g

6.66

10.77

144

39.1%